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Bacterial Cellulose Composite Solid Polymer ElectrolyteWith High Tensile Strength and Lithium DendriteInhibition for Long Life Battery

Abstract

The development of metallic lithium anode is restrained by lithium dendrite growth during cycling. The solid polymer electrolyte with high mechanical strength and lithium ion conductivity could be applied to inhibit lithium dendrite growth. To prepare the high‐performance solid polymer electrolyte, the environment‐friendly and cheap bacterial cellulose (BC) is used as filler incorporating with PEO‐based electrolyte owing to good mechanical properties and Li salts compatibility. PEO/LiTFSI/BC composite solid polymer electrolytes (CSPE) are prepared easily by aqueous mixing in water. The lithium ion transference number of PEO/LiTFSI/BC CSPE is 0.57, which is higher than PEO/LiTFSI solid polymer electrolyte (SPE) (0.409). The PEO/LiTFSI/BC CSPE exhibits larger tensile strength (4.43 MPa) than PEO/LiTFSI SPE (1.34 MPa). The electrochemical window of composite electrolyte is widened 1.43 V by adding BC. Density functional theory calculations indicate that flex of PEO chains around Li atoms is suppressed, suggesting the enhanced lithium ion conductivity. Frontier molecular orbitals results suggest that an unfavorable intermolecular charge transfer lead to achieve higher potential for BC composite electrolyte. All solid‐state Li metal battery with PEO/LiTFSI/BC CSPE delivers longer cycle life for 600 cycles than PEO/LiTFSI SPE battery (50 cycles). Li symmetrical battery using PEO/LiTFSI/BC CSPE could be stable for 1160 h.

Category

Academic article

Language

English

Author(s)

  • Yuhan Li
  • Zongjie Sun
  • Dongyu Liu
  • Shiyao Lu
  • Fei Li
  • Guoxin Gao
  • Min Zhu
  • Mingtao Li
  • Yanfeng Zhang
  • Huaitian Bu
  • Zhiyu Jia
  • Shujiang Ding

Affiliation

  • SINTEF Industry / Materials and Nanotechnology
  • China

Year

2020

Published in

Energy & Environmental Materials (EEM)

ISSN

2575-0348

View this publication at Norwegian Research Information Repository