XFC 350kW Lithium Plating Risk — PatSnap Eureka
How 350 kW Extreme Fast Charging Amplifies Lithium Plating Risk in Cylindrical Cells
At 350 kW, lithium-ion diffusion can no longer keep pace with incoming ionic flux — metallic lithium deposits on the graphite anode instead of intercalating. Explore the electrochemistry, detection methods, and mitigation strategies drawn from 50+ patent filings by LG, BYD, Hyundai, Huawei, Toyota, and GM.
Why XFC at 350 kW Triggers Lithium Plating in Cylindrical Cells
Lithium plating occurs when the anode potential drops below 0 V vs. Li/Li⁺ during charging, causing metallic lithium to deposit on the graphite surface rather than intercalate into its lattice. At conventional charge rates this risk is manageable, but at the C-rates implied by 350 kW delivery to vehicle-scale battery packs, the phenomenon becomes acute. The fundamental challenge is that lithium-ion diffusion through the graphite lattice and across the solid electrolyte interphase (SEI) is rate-limited: when incoming ionic flux exceeds the electrode's ability to absorb it, surface lithiation leads to plating.
As established by A123 Systems (2013), the key design criterion for high-rate cells is that the total area-specific impedance and the relative area-specific impedances of positive and negative electrodes must be engineered so that, during charging at 4C or greater, the negative electrode potential remains above the potential of metallic lithium. The patent specifies that current capacity per unit area of both electrodes must be at least 3 mAh/cm², reflecting the direct link between electrode loading and plating susceptibility at high rates. For cylindrical cells, the effective local C-rate at the anode surface can far exceed the nominal pack-level C-rate because current distribution along the winding is non-uniform.
Electrode porosity is equally critical. Per LG Chem (2021), the porosity of the anode electrode — optimally set to 25–35% — combined with the anode loading amount directly determines the upper boundary condition for safe charge current C-rate, expressed as a quadratic function. The system uses a lookup table mapping anode loading to the maximum permissible C-rate. This ratio of electrode porosity to loading is a critical design variable when targeting extreme fast charge capability. Learn more about patent landscape analysis for battery materials on the PatSnap platform.
Thermal coupling further exacerbates plating risk under XFC. At 350 kW charging, the net thermal state of the cell at the start of the charge event is critical: low initial temperatures dramatically raise plating risk because ionic conductivity in both the electrolyte and the SEI is thermally activated. LG Energy Solution (2025) explicitly addresses the relationship between cylindrical cell geometry, residual electrolyte composition (specifically ethylene carbonate content), and negative electrode reaction area under high-heat conditions — parameters equally relevant during XFC-induced thermal loading.
Real-Time Lithium Plating Detection for XFC Deployments
Detecting the onset of lithium plating without disassembling the cell is a prerequisite for safely implementing XFC protocols. Five distinct detection strategies have emerged in the patent literature, each suited to different deployment contexts.
Three-Electrode Anode Potential Monitoring
A three-electrode cell with a reference electrode measures the anode potential (CCV) as a function of SOC during charging. The point at which the negative electrode potential ceases to decrease — or "flattens" — is defined as the onset of Li plating, and this SOC value is set as the charging limit. Provides ground-truth calibration data for indirect detection algorithms.
Reference electrode · Ground-truth calibrationdV/dQ Curve — Model-Free Detection
A dV/dQ curve is derived during charging to identify inflection points corresponding to the onset of lithium precipitation. From these inflection points, a "lithium precipitation line" and a safety margin limit line are constructed. This model-free, data-driven approach is particularly suited to the variable current profiles encountered in XFC scenarios.
No model required · XFC-optimisedPolarization Decomposition — No Hardware Mod
The negative electrode voltage is reconstructed from the total terminal voltage by combining the open-circuit voltage, terminal voltage, and a calibrated polarization proportion representing the fraction of total cell polarization attributable to the anode at the plating critical point. When the reconstructed anode voltage falls below the lithium plating threshold, the system flags the condition. No hardware modification required — implementable in BMS firmware.
BMS firmware · Sealed commercial cellsPost-Charge Relaxation dV/dt Analysis
Voltage is periodically acquired during rest after charging terminates, and a time-difference voltage curve (dV/dt vs. t) is constructed. The presence of a characteristic peak in this curve is used to confirm lithium deposition and quantify the deposited amount. Under XFC conditions, this relaxation-period detection is especially valuable because plating events during brief, high-rate charge pulses may not be apparent from current-voltage data alone.
Post-charge rest · Quantifies deposit amountXFC Lithium Plating — Innovation by Assignee and Approach
Patent data from PatSnap Eureka reveals which organisations are leading in XFC plating prevention and which technical approaches dominate the filing landscape.
Patent Filing Activity by Major Assignee — XFC Lithium Plating Domain
LG Energy Solution and LG Chem collectively represent the most prolific assignees, with filings spanning protocol design, BMS logic, and adaptive charging. Source: PatSnap Eureka patent analysis.
XFC Plating Detection Approaches — Technical Distribution
Patent filings cluster around four primary detection signal types. Voltage relaxation and OCV tracking together account for the majority of non-invasive detection approaches.
Four Protocol Architectures for Safe XFC at 350 kW
Given that 350 kW XFC represents a peak power condition typically delivered during a brief charge window of 10–15 minutes for a ~100 kWh pack, the charging protocol must dynamically modulate current in response to real-time plating risk state of each cell.
ROM-Embedded Adaptive Protocol Control
Hyundai Motor Company embeds an SOC model, side reaction model, and performance degradation model into a reduced-order electrochemical model (ROM) running onboard. The ROM simultaneously calculates SOC, side reaction rate, and lithium plating rate. The charging protocol — expressed as a C-rate vs. SOC relationship applied as constant-current steps — is updated in real time to avoid crossing the plating threshold. The high incoming power at 350 kW mandates aggressive current tapering as SOC rises, and the ROM computes the exact current limit at each SOC point.
MCC-CV Protocol with Olivine Electrode Co-Design
The University of Ulsan uses a multistep constant-current combined with constant-voltage (MCC-CV) protocol in conjunction with olivine-structured lithium metal phosphate electrode materials surface-coated with carbon, achieving full charge completion within an average of 10 minutes. The olivine material's high ionic conductivity and the carbon coating's improved electron transport enable higher current densities without triggering plating. This illustrates the principle that XFC protocols must be tailored to the specific electrode chemistry and structure of cylindrical cells.
Key Players and Innovation Strategies in XFC Plating Prevention
The patent landscape reveals a clearly stratified competitive structure. Dominant assignees include LG Energy Solution, LG Chem, BYD, Hyundai Motor Company, Huawei Technologies, General Motors, Toyota, and several university-affiliated research groups across Korea, the United States, Japan, China, and Europe.
| Assignee | Primary Technical Approach | Representative Patent | Year | Jurisdiction |
|---|---|---|---|---|
| LG Chem | Anode porosity-based C-rate boundary (quadratic function, 25–35% porosity) | Battery Rapid Charging System | 2021 | KR / US |
| LG Energy Solution | OCV cycle tracking for cumulative plating detection across fleet packs | Detection method of lithium plating | 2024 | KR / US |
| Hyundai Motor | ROM-embedded SOC + side reaction + plating rate model for real-time protocol control | System and method for rapid charging lithium ion battery | 2020 / 2025 | US / KR |
| BYD | dV/dt relaxation curve peak detection for post-charge plating quantification | Battery lithium deposition state detection method and system | 2023 / 2025 | CN |
| Huawei | Polarization decomposition — reconstructs anode voltage without reference electrode | Method and apparatus for detecting lithium plating | 2023 | EP / US |
| Toyota | Multi-stage current sequencing tied to solid electrolyte surface morphology | Method for charging a secondary battery | 2020 / 2025 | JP / US |
| General Motors | dVcell/dt open-circuit rest detection within first minutes post-XFC | Minimizing lithium plating in lithium-ion batteries | 2018 | US |
| Ajou University | Model-free dV/dQ inflection-point detection with lithium precipitation limit line | Fast charge method to prevent lithium plating in EV battery | 2023 | KR |
Track XFC Patent Activity Across All These Assignees
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Seven Patent-Backed Principles for XFC Lithium Plating Prevention
Every principle below is traceable to a specific patent filing in the advanced materials and battery technology patent landscape analysed via PatSnap Eureka. For further context, see US DOE EV battery research and NREL battery laboratory work.
Anode Potential Suppression Is the Definitive Plating Mechanism
When charge current drives the graphite anode potential below 0 V vs. Li/Li⁺, metallic lithium deposits preferentially on the surface. Engineering the electrode-level area-specific impedance to maintain the anode above this threshold during ≥4C charging is the foundational design requirement. Current capacity per unit area must be at least 3 mAh/cm².
≥4C · 3 mAh/cm² minimum loadingElectrode Porosity and Anode Loading Are the Primary Cell-Design Levers
A porosity window of 25–35% combined with a calibrated anode loading quantity determines the quadratic boundary condition for safe charge C-rate. For cylindrical cells in a 350 kW-compatible pack, this ratio of electrode porosity to loading is the critical design variable when targeting extreme fast charge capability.
25–35% porosity · Quadratic C-rate boundaryROM-Based Protocol Control Is the Most Advanced XFC Plating Avoidance Approach
By computing the lithium plating rate alongside SOC and side reaction rate within an onboard reduced-order electrochemical model, the charging protocol can be dynamically constrained. The high incoming power at 350 kW mandates aggressive current tapering as SOC rises, and the ROM computes the exact current limit at each SOC point.
Real-time ROM · Dynamic current limitingPost-Charge Relaxation Voltage Analysis Offers Fleet-Deployable Detection
The characteristic peak in dV/dt curves during rest following an XFC event directly reflects lithium stripping back from plated metal. Under XFC conditions, plating events that occur during brief, high-rate charge pulses may not be apparent from current-voltage data alone — making the relaxation window critical.
dV/dt peak · Post-charge rest windowPolarization Decomposition Enables Anode Voltage Reconstruction Without Reference Electrode
Huawei's method of calculating the negative electrode polarization voltage from a calibrated polarization proportion allows plating detection in sealed commercial cylindrical cells. No hardware modification to the cell is required — the method is implementable entirely in BMS firmware, making it viable for production-scale XFC deployment.
No hardware mod · BMS firmwarePulse Protocols Address SOC Non-Uniformity Unique to Cylindrical Cells
Regional anode SOC imbalance — a geometric consequence of cylindrical winding — is mitigated by periodic low-current pulses that redistribute concentration gradients. Pure high-rate constant-current charging creates regional SOC imbalances that can cause local plating even when the cell's average SOC remains safely below the thermodynamic plating threshold.
Pulse interleaving · SOC gradient reductionLongitudinal OCV Tracking Enables Early Warning of Cumulative Plating Damage
Tracking OCV after full charge and full discharge across every cycle allows BMS algorithms to detect progressive plating build-up before it manifests as capacity fade or internal short circuit. This longitudinal monitoring is critical for cylindrical cell packs subjected to repeated XFC events, where incremental plating across hundreds of cycles can lead to dendrite-induced internal short circuits.
Where XFC Lithium Plating Research Is Heading
Korean academic institutions — notably Ajou University and the University of Ulsan — represent the research frontier, contributing model-free detection methods and novel electrode-protocol co-designs specifically targeting ultra-fast charging. The University of Ulsan's MCC-CV work with olivine-structured materials achieving full charge in an average of 10 minutes is a benchmark for electrode-protocol co-design at XFC rates.
The broader innovation intelligence platform at PatSnap tracks over 50 relevant filings in this domain across Korea, the United States, Japan, China, Europe, and other jurisdictions. The dominant technical approaches span real-time electrochemical detection via open-circuit voltage (OCV) tracking, reduced-order electrochemical modeling (ROM) for adaptive charging protocol generation, multi-step constant-current (MCC) protocols, and electrode-level design modifications to raise the lithium plating threshold.
For developers building next-generation XFC infrastructure, the IEC standards body and PatSnap customer case studies provide additional context on how IP intelligence is being applied in production battery programs. The PatSnap Open API also enables programmatic access to patent data for R&D teams building automated monitoring pipelines.
While few patents explicitly name "350 kW" as a specific power setpoint, the mechanistic challenges addressed throughout this body of work are directly applicable to XFC scenarios: extreme charge rates compress the time available for lithium-ion intercalation into graphite, making plating the dominant failure mode. The patent landscape will continue to evolve as 350 kW and higher-power charging infrastructure becomes commercially deployed.
Extreme Fast Charging & Lithium Plating — Key Questions Answered
Lithium plating occurs when the anode potential drops below 0 V vs. Li/Li⁺ during charging, causing metallic lithium to deposit on the graphite surface rather than intercalate into its lattice. At the C-rates implied by 350 kW delivery to vehicle-scale battery packs, lithium-ion diffusion through the graphite lattice and across the solid electrolyte interphase (SEI) is rate-limited: when incoming ionic flux exceeds the electrode's ability to absorb it, surface lithiation leads to plating.
The porosity of the anode electrode — optimally set to 25–35% — combined with the anode loading amount directly determines the upper boundary condition for safe charge current C-rate, expressed as a quadratic function. This ratio of electrode porosity to loading is a critical design variable when targeting extreme fast charge capability.
Several non-invasive detection methods exist. BYD monitors voltage periodically during rest after charging terminates and constructs a time-difference voltage curve (dV/dt vs. t); the presence of a characteristic peak confirms lithium deposition. Huawei's polarization-decomposition approach reconstructs the negative electrode voltage from terminal voltage without any hardware modification. LG Energy Solution tracks OCV after full charge and full discharge across every cycle to detect cumulative plating. General Motors uses the derivative of cell voltage during open-circuit rest (dVcell/dt) within the first few minutes of rest.
Multiple protocol architectures have been proposed. Hyundai Motor Company embeds a reduced-order electrochemical model (ROM) onboard to calculate SOC, side reaction rate, and lithium plating rate simultaneously, updating the charging protocol in real time. Multistep constant-current (MCC) combined with constant-voltage (CV) protocols have been optimized by the University of Ulsan, achieving full charge within an average of 10 minutes. Sunwoda proposes alternating large- and small-current charge-discharge cycles to eliminate concentration polarization and reduce anode SOC distribution non-uniformity in cylindrical cells.
For cylindrical cells, the effective local C-rate at the anode surface can far exceed the nominal pack-level C-rate, particularly because current distribution along the winding can be non-uniform. Additionally, pure high-rate constant-current charging creates regional SOC imbalances that can cause local plating even when the cell's average SOC remains safely below the thermodynamic plating threshold. Alternating large- and small-current pulse protocols address this SOC non-uniformity unique to cylindrical cell geometries.
The patent landscape has more than 50 relevant filings. LG Energy Solution and LG Chem are the most prolific assignees, covering charging protocol establishment, rapid charging system design, and adaptive protocol generation. BYD focuses on in-situ and post-charge detection. Hyundai Motor Company leads in model-based ROM control. Huawei Technologies has developed polarization-decomposition detection algorithms with active patents in EP and US jurisdictions. Toyota and General Motors also hold key patents on multi-stage protocols and non-invasive plating detection respectively.
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References
- Fast charge method to prevent lithium plating in an electric vehicle lithium-ion battery — Ajou University Industry-Academic Cooperation Foundation, 2023
- Charging limit evaluation method of battery, method and apparatus for fast charging using the same — LG Chem, 2017
- Battery charging method and system, vehicle, and medium based on lithium plating detection — BYD Company Limited, 2023
- System and method for rapid charging lithium ion battery — Hyundai Motor Company, 2020
- System and method for rapid charging lithium ion battery — Hyundai Motor Company (KR), 2025
- Battery Rapid Charging System — LG Chem, 2019
- Battery Rapid Charging System — LG Chem, 2021
- Lithium plating detection method and apparatus, and polarization proportion acquisition method and apparatus — Huawei Technologies Co., Ltd., 2023 (EP)
- Method and apparatus for detecting lithium plating, and method and apparatus for obtaining polarization proportion — Huawei Technologies Co., Ltd., 2023 (US)
- Detection method of lithium plating, method and apparatus for battery managing using the same — LG Energy Solution, 2024
- Battery lithium deposition state detection method and system, vehicle, device, and storage medium — BYD Company Limited, 2023
- Battery lithium deposition state detection method and system, vehicle, device, and storage medium — BYD Company Limited, 2025
- Lithium secondary cell with high charge and discharge rate capability — A123 Systems Incorporated, 2013
- Secondary battery capable of extremely fast charging and fast charging method thereof — University of Ulsan Industry-Academic Cooperation Foundation, 2025
- Method of charging batteries, electronic devices and electrical appliances — Sunwoda Mobility Energy Technology Company Limited, 2026
- Lithium secondary battery charging protocol establishment method, battery management system, battery pack and battery cell charging device — LG Energy Solution, 2024
- Establishing method for charging protocol for secondary battery — LG Chem, 2021
- Apparatus and method for generating charging protocol — LG Energy Solution, 2025
- Method for charging a secondary battery — Toyota Jidosha Kabushiki Kaisha, 2020
- Charging method and charging system — Toyota Motor Corporation, 2025
- Minimizing lithium plating in lithium-ion batteries — General Motors Global Technology Operations LLC, 2018
- Apparatus for controlling charging current of battery cell and method thereof — Hyundai Motor Company, 2025
- Lithium secondary battery and thermal safety evaluation method for lithium secondary battery — LG Energy Solution, 2025
- US Department of Energy — Electric Vehicle Batteries Research
- National Renewable Energy Laboratory (NREL) — Battery Laboratory
- European Patent Office (EPO) — Patent Search and Analysis
- The Electrochemical Society — SEI and Battery Electrochemistry
- International Electrotechnical Commission (IEC) — EV Charging Standards
All patent data and statistics on this page are sourced from the references above and from PatSnap's proprietary innovation intelligence platform, PatSnap Eureka.
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