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Anomalous Thermal Decomposition Behavior of Polycrystalline LiNi0.8Mn0.1Co0.1O2 in PEO-Based Solid Polymer Electrolyte

Journal Article · · Advanced Functional Materials
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  1. Chinese Academy of Sciences (CAS), Beijing (China)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States)
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we report that replacing liquid electrolytes (LEs) with polymer electrolytes has been considered a promising approach to developing next-generation lithium-ion batteries (LIBs) with high energy density and superior safety. Nevertheless, compared with the extensive research on the electrochemical stability of the cathode/polymer electrolyte interfaces, reports on their thermal behaviors are rare to date. Herein, this work systematically investigates the thermal stability of two typical layered oxide cathodes, LiCoO2 (LCO) and LiNi0.8Mn0.1Co0.1O2 (NMC811), with poly(ethylene oxide) (PEO) electrolyte and with carbonate LEs, respectively. It is found that the oxygen release from the cathodes plays a central role in thermal runaway. Replacing the LE with PEO electrolyte can considerably improve the thermal stability of LCO, but surprisingly, deteriorate that of NMC811. The reason is that the surface of single-crystalline LCO particles can be effectively passivated by the PEO electrolyte during heating, but PEO cannot sufficiently passivate all the primary particles of NMC811 owing to insufficient interface wettability of PEO electrolyte within the polycrystalline secondary NMC811 particles. The findings in this work collectively formulate valuable guidance for improving the safety of polymer-electrolyte-based as well as other types of all-solid-state lithium-ion batteries.
Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
China Postdoctoral Science Foundation; National Natural Science Foundation of China; Natural Science Foundation of Beijing; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1866831
Alternate ID(s):
OSTI ID: 23159539
Journal Information:
Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 23 Vol. 32; ISSN 1616-301X
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

25 ENERGY STORAGE
battery safety
cathodes
solid electrolytes
solid-state batteries
thermal stability