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NaH(2)PO(4)as an Electrolyte Additive for Enhanced Thermal Stability of LiNi0.8Co0.1Mn0.1O2/Graphite Batteries

Title
NaH(2)PO(4)as an Electrolyte Additive for Enhanced Thermal Stability of LiNi0.8Co0.1Mn0.1O2/Graphite Batteries
Authors
Jo, MinsangPark, Seong HyoLee, Hochun
DGIST Authors
Jo, Minsang; Park, Seong Hyo; Lee, Hochun
Issue Date
2020-10
Citation
Journal of the Electrochemical Society, 167(13), 130502
Type
Article
Article Type
Article
Keywords
SURFACE MODIFICATIONVINYLENE CARBONATEHIGH-TEMPERATURETRIS(TRIMETHYLSILYL) PHOSPHITELINI0.6CO0.2MN0.2O2 CATHODELITHIUM-ION BATTERIESLI-IONNI-RICHCATHODE MATERIALSELECTROCHEMICAL PERFORMANCE
ISSN
0013-4651
Abstract
The wide use of nickel-rich layered cathode materials is plagued by their severe degradation at elevated temperatures. In this study, we introduce monobasic sodium phosphate (NaH2PO4) (P2) as a versatile electrolyte additive that improves the thermal stability of the LiNi0.8Co0.1Mn0.1O2(NCM811) cathode material. P2 remarkably enhances the cycle and storage performances of NCM811/graphite cells at 60 degrees C. We elucidate that P2 plays a beneficial role in two ways: (i) it forms a conductive and protective cathode-electrolyte interphase layer that suppresses electrolyte decomposition and NiO-phase formation on the cathode; (ii) it controls the hydrofluoric acid content, and thus decelerates the formation of NiO-phase on the cathode and the degradation of the solid electrolyte interphase layer on the anode. Considering its excellent thermal stability and practical availability, P2 is a promising electrolyte additive for Ni-rich NCM cathodes that suffer from poor thermal stability. © 2020 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited.
URI
http://hdl.handle.net/20.500.11750/12587
DOI
10.1149/1945-7111/abb566
Publisher
Electrochemical Society, Inc.
Related Researcher
  • Author Lee, Hochun Electrochemistry Laboratory for Sustainable Energy(ELSE)
  • Research Interests Lithium-ion batteries; Novel Materials for rechargeable batteries; Novel energy conversion;storage systems; Electrochemistry; 리튬이차전지; 이차전지용 신규 전극 및 전해액; 신규 에너지변환 및 저장 시스템; 전기화학
Files:
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Collection:
Department of Energy Science and EngineeringElectrochemistry Laboratory for Sustainable Energy(ELSE)1. Journal Articles


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