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Title: Elucidating Cathode Degradation Mechanisms in LiNi0.8Mn0.1Co0.1O2 (NMC811)/Graphite Cells Under Fast Charge Rates Using Operando Synchrotron Characterization

Journal Article · · Journal of the Electrochemical Society
 [1]; ORCiD logo [2];  [3];  [3];  [2];  [2];  [4];  [4];  [5];  [5]; ORCiD logo [3];  [3]; ORCiD logo [3]; ORCiD logo [3]
  1. Stony Brook Univ., NY (United States); Northwestern University, Evanston, IL, United States
  2. Stony Brook Univ., NY (United States)
  3. Stony Brook Univ., NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States)
  5. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
+ Show Author Affiliations

Li-ion batteries capable of extreme fast charging (XFC) are in demand to facilitate widespread electric vehicle (EV) adoption. While the impact of fast charge on the negative electrode has been studied, degradation of state-of-the-art NMC811 under XFC conditions has not been studied in detail. Herein, cathode degradation is probed in NMC811/graphite batteries by analysis of structural and chemical changes for recovered samples previously cycled under XFC conditions and during typical cycling. NMC surface reconstruction, as determined by soft X-ray absorption, was not detected for recovered electrodes. Furthermore, bulk redox activity from X-ray absorption near edge structure measurements showed more change in the oxidation state of Ni and Co under the 1C charge rate compared to the 4C rate consistent with the electrochemistry. Increased unit cell volume contraction under the 1C rate as determined by operando X-ray diffraction suggests that higher charge rates may provide a protective effect on the cathode by reducing structural distortion due to less delithiation.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Northwestern Univ., Evanston, IL (United States); State Univ. of New York (SUNY), Stony Brook, NY (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
EE0008356; SC0012673; SC0012704; SC0021314
OSTI ID:
1865643
Report Number(s):
BNL-223013-2022-JAAM; W911NF-20-2-0284
Journal Information:
Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 2 Vol. 169; ISSN 0013-4651
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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