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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Lufeng Yang
  • Jin Zhang
  • Weiran Xue
  • Rusong Chen
  • Hongyi Pan
  • Xiqian Yu
  • Yijin Liu
  • Hong Li
  • Liquan Chen
  • Xuejie Huang

Detail(s)

Original languageEnglish
Article number2200096
Journal / PublicationAdvanced Functional Materials
Volume32
Issue number23
Online published3 Mar 2022
Publication statusPublished - 3 Jun 2022
Externally publishedYes

Abstract

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 Area(s)

  • battery safety, cathodes, solid electrolytes, solid-state batteries, thermal stability

Citation Format(s)

Anomalous Thermal Decomposition Behavior of Polycrystalline LiNi0.8Mn0.1Co0.1O2 in PEO-Based Solid Polymer Electrolyte. / Yang, Lufeng; Zhang, Jin; Xue, Weiran; Li, Jizhou; Chen, Rusong; Pan, Hongyi; Yu, Xiqian; Liu, Yijin; Li, Hong; Chen, Liquan; Huang, Xuejie.

In: Advanced Functional Materials, Vol. 32, No. 23, 2200096, 03.06.2022.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review