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In Situ Conversion of Artificial Proton‐Rich Shell to Inorganic Maskant Toward Stable Single‐Crystal Ni‐Rich Cathode

Journal Article · · Advanced Materials
 [1];  [1];  [2];  [1];  [1];  [3];  [4];  [1];  [5];  [5];  [6];  [1]
  1. Peking University, Shenzhen (China)
  2. Univ. of Hong Kong (China)
  3. Sun Yat‐sen University, Shenzhen (China)
  4. The Chinese University of Hong Kong, Shenzhen (China)
  5. Argonne National Laboratory (ANL), Argonne, IL (United States)
  6. Peking University, Shenzhen (China); Chinese Academy of Sciences (CAS), Shenyang (China)
Single-crystal high-nickel oxide with an integral structure can prevent intergranular cracks and the associated detrimental reactions. Yet, its low surface-to-volume ratio makes surficial degradation a more critical factor in electrochemical performance. Herein, artificial proton-rich (ammonium bicarbonate) shell is successfully introduced on the nickel-rich LiNi0.92Co0.06Mn0.02O2 single crystals for in situ electrochemically conversing into inorganic maskant to enhance stability of cathode. The process is that the surficial enriched proton, once released from the ammonium bicarbonate shell (proton reservoir) during 1st charge, is immediately captured by LiPF6, in situ electrochemically conversing to LiF and Li3PO4 sub-nano particle dense maskant (sub-nano F-&P-maskant). The in situ formed compact nano F-&P-maskant significantly resists the cathode against electrolyte attack and improves the surface stability of particles during long-term cycling. Consequently, this surface modification enables 95% capacity retention after 100 cycles at a high voltage of 4.5 V in the half cell and 83% capacity retention after 800 cycles in the full cell. In conclusion, this work demonstrates a strategy for reconstructing the protective layer using the rational design of surficial enriched proton shells for advanced lithium batteries.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
Basic and Applied Basic Research Foundation of Guangdong Province; Guangdong Key Laboratory of Design and calculation of New Energy Materials; International joint Research Center for Electric Vehicle Power Battery and Materials; Liaoning Provincial Science Fund for Distinguished Young Scholar; Shenzhen Key Laboratory of New Energy Resources Genome Preparation and Testing; USDOE
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
2572895
Journal Information:
Advanced Materials, Journal Name: Advanced Materials Journal Issue: 7 Vol. 37; ISSN 1521-4095; ISSN 0935-9648
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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