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Quantification of Dead Lithium on Graphite Anode under Fast Charging Conditions

Journal Article · · Journal of the Electrochemical Society

A series of computational and experimental studies were conducted to understand the onset of lithium plating and subsequent quantification of dead lithium on graphite electrodes in the design of fast charging batteries. The experiments include titration and relaxation studies for detecting initiation of lithium metal plating for various SOC and C-rates, which are compared against the thermodynamically consistent phase field computational results. The collaborative study on "model graphite electrode" with 2.18 mAh cm-2 nominal capacity at 25 degrees C demonstrates: (1) the macroscopic voltage response during relaxation studies indicate the reintercalation of plated lithium into the graphite anode; (2) for SOC below 60% and low C-Rates, there is no dead lithium; (3) for SOC between 60% to 80%, and C-Rates in the range of 4C-6C show dead lithium both in experiments and simulations; (4) at 100% SOC and 4C-6C rates, large amounts of dead lithium are observed. The study presented here allows us to evaluate the effects of the physical properties of the electrochemical system on plating and stripping kinetics and the amount of dead lithium on graphite electrodes, which determines the cell capacity loss under fast charge.

Research Organization:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V), Extreme Fast Charge Program (XCEL)
DOE Contract Number:
AC36-08GO28308
OSTI ID:
1867590
Report Number(s):
NREL/JA-5700-80665; MainId:77449; UUID:5fc61989-5ef9-4ebf-9c7b-e8e4710e73c4; MainAdminID:64498
Journal Information:
Journal of the Electrochemical Society, Vol. 169, Issue 4
Country of Publication:
United States
Language:
English

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