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Title: Upgrading the Performance and Stability of Lithium, Manganese-Rich Layered Oxide Cathodes with Combined-Formic Acid and Spinel Coating Treatment

Journal Article · · Batteries & Supercaps
ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [2]; ORCiD logo [1]
  1. Worcester Polytechnic Institute, MA (United States)
  2. Argonne National Lab. (ANL), Lemont, IL (United States)
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We report improving sluggish rate performance and cycling stability of Li, Mn-rich cathode materials (LMR) is of great importance for practical implementation. Here, dual surface modification on LMR particles with formic acid washing and spinel coating improves the electrochemical performance. Dilute formic acid can remove the Li2CO3 surface impurities and selectively reduce Ni while significantly increasing specific surface area by ~32 %, unlocking more electrochemically active surfaces. Spinel coating enhances cycle stability by suppressing detrimental side reactions at electrode-electrolyte interfaces at high voltage. Post-annealing temperature was found to significantly affect the cathode performance. Higher temperature favors diffusion of transition metal (TM)/Li ions of the spinel coating from surface to the bulk, removing the coating by possible reconstruction into the layered structure and thus degrading the performance. The spinel coating also appears to increase Co3+ segregation on the particle surface. Compared to the original material, the optimized sample demonstrates 47 % higher capacity retention at 3C and retains 89 % of initial capacity after 150 cycles at 0.5C. Besides, the specific energy density of 523 Wh kg-1 can be attained after 150 cycles at 0.5C. Moreover, the post-cycling analysis of modified sample verifies a better structural integrity with less particle cracking. Altogether, this study portrays an alternative strategy to overcome the shortcomings of LMR cathode materials.

Research Organization:
Argonne National Laboratory (ANL), Lemont, IL (United States)
Sponsoring Organization:
Bangkok Bank Public Co., Ltd; Chulalongkorn University; USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1875813
Journal Information:
Batteries & Supercaps, Journal Name: Batteries & Supercaps Journal Issue: 4 Vol. 5; ISSN 2566-6223
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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25 ENERGY STORAGE
formic acid
high-energy cathodes
li-rich layered oxides
spinel coating
surface treatment