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Title: Proton-exchange induced reactivity in layered oxides for lithium-ion batteries

Journal Article · · Nature Communications
 [1]; ORCiD logo [2];  [3]; ORCiD logo [4]; ORCiD logo [5];  [5];  [5]; ORCiD logo [5];  [6];  [5];  [7]; ORCiD logo [3]; ORCiD logo [3];  [5]; ORCiD logo [5];  [8]; ORCiD logo [5]; ORCiD logo [5]
  1. University of California, San Diego, La Jolla, CA (United States); Chinese Academy of Sciences, Suzhou (China)
  2. University of California, San Diego, La Jolla, CA (United States); Fudan University, Shanghai (China)
  3. Chinese Academy of Sciences, Suzhou (China)
  4. Soochow University, Jiangsu (China)
  5. University of California, San Diego, La Jolla, CA (United States)
  6. Argonne National Laboratory (ANL), Argonne, IL (United States)
  7. San Diego State University, CA (United States)
  8. Honda Research Institute USA, Columbus, OH (United States)

LiNixCoyMn1-x-yO2 (0 < x, y < 1, NCM) is the dominant positive material for the state-of-the-art lithium-ion batteries. However, the sensitivity of NCM materials to moisture makes their manufacturing, storage, transportation, electrode processing and recycling complicated. Although it is recognized that protons play a critical role in their structure stability and performance, proton exchange with Li+ in NCM materials has not been well understood. Here, we employ advanced characterizations and computational studies to elucidate how protons intercalate into the layered structure of NCM, leading to the leaching of Li+ and the formation of protonated NCM. It is found that protonation facilitates cation rearrangement and formation of impurity phases in NCM, significantly deteriorating structural stability. The adverse effects induced by protons become increasingly pronounced with a higher Ni content in NCM. Through a comprehensive investigation into the thermodynamics and kinetics of protonation, we discover that Li deficiencies in NCM materials can be resolved via solution process in the presence of Li+ ions and controlled proton concentration. The underlying mechanism of relithiation is further explored through materials characterizations and kinetics modeling. This work provides crucial insights into controlling structural and compositional defects of Li-ion battery positive material in complicated processing environment.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
2477089
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 15; ISSN 2041-1723
Publisher:
Springer Science and Business Media LLCCopyright Statement
Country of Publication:
United States
Language:
English

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