Hexagonal boron nitride induces anion trapping in a polyethylene oxide based solid polymer electrolyte for lithium dendrite inhibition

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

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Author(s)

  • Yuhan Li
  • Libo Zhang
  • Zongjie Sun
  • Guoxin Gao
  • Min Zhu
  • Yanfeng Zhang
  • Zhiyu Jia
  • Chunhui Xiao
  • Huaitian Bu
  • Kai Xi
  • Shujiang Ding

Detail(s)

Original languageEnglish
Pages (from-to)9579-9589
Number of pages10
Journal / PublicationJournal of Materials Chemistry A
Volume8
Issue number19
Online published25 Apr 2020
Publication statusPublished - 21 May 2020
Externally publishedYes

Abstract

Here we prepare a hexagonal boron nitride (h-BN)–polyethylene oxide composite polymer electrolyte via a convenient casting method, which shows high mechanical strength. Meanwhile, the electrochemical properties (electrochemical window and lithium ion transference number) are enhanced but the ionic conductivity of the h-BN composite electrolyte is decreased after adding h-BN. Density functional theory (DFT) calculation results show that a stronger binding effect is observed between TFSI- and BN, compared to that between Li+ and BN. Molecular dynamics (MD) simulations are also utilized to study the mechanism behind the enhanced Li ion diffusion by h-BN addition. Li+ diffusion in PEO/LiTFSI/BN is lower than that in the PEO/LiTFSI system, but the diffusion of TFSI exhibits a more significant decline rate in the presence of BN. This indicates that the presence of BN suppresses anion motion and enhances selectivity in Li+ transport. Thus, the PEO/LiTFSI/h-BN composite electrolyte exhibits higher Li ion conductivity but lower anion diffusivity than the PEO/LiTFSI system. Hence the h-BN composite polymer electrolyte in a Li/Li symmetric battery provides a long cycling time of 430 h at 0.2 mA cm-2. A Li metal/LiFePO4 full battery with the PEO/LiTFSI/h-BN composite electrolyte also works more efficiently for long-term cycling (140 cycles) than a filler-free PEO based electrolyte (39 cycles).

Citation Format(s)

Hexagonal boron nitride induces anion trapping in a polyethylene oxide based solid polymer electrolyte for lithium dendrite inhibition. / Li, Yuhan; Zhang, Libo; Sun, Zongjie; Gao, Guoxin; Lu, Shiyao; Zhu, Min; Zhang, Yanfeng; Jia, Zhiyu; Xiao, Chunhui; Bu, Huaitian; Xi, Kai; Ding, Shujiang.

In: Journal of Materials Chemistry A, Vol. 8, No. 19, 21.05.2020, p. 9579-9589.

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