Artificial solid electrolyte interphase based on polyacrylonitrile for homogenous and dendrite-free deposition of lithium metal

doi:10.1088/1674-1056/28/7/078202

Abstract

High chemical reactivity, large volume changes, and uncontrollable lithium dendrite growth have always been the key problems of lithium metal anodes. Coating has been demonstrated as an effective strategy to protect the lithium metal. In this work, the effects of polyacrylonitrile (PAN)-based coatings on electrodeposited lithium have been studied. Our results show that a PAN coating layer provides uniform and dendrite-free lithium deposition as well as better cycling performance with carbonate electrolyte. Notably, heat treatment of the PAN coating layer promotes the formation of larger deposit particle size and higher coulombic efficiency (85%). The compact coating layer of heat-treated PAN with a large Young modulus (82.7 GPa) may provide stable protection for the active lithium. Improved homogeneity of morphology and mechanical properties of heat-treated PAN contribute to the larger deposit particles. This work provides new feasibility to optimize the polymer coating through rational modification of polymers.

Keywords: lithium deposition polymer coating artificial solid electrolyte interphase polyacrylonitrile

Received: 04 April 2019
Revised: 16 May 2019
Accepted manuscript online:

PACS:	82.47.Aa	(Lithium-ion batteries)
	65.40.gk	(Electrochemical properties)
	82.45.Fk	(Electrodes)

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. 51822211 and 51802342) and the State Grid Technology Project, China (Grant No. DG71-17-010).

Corresponding Authors: Xi-Qian Yu, Hong Li
E-mail: hli@iphy.ac.cn;xyu@iphy.ac.cn

Cite this article:

Hang-Yu Xu(徐航宇), Quan Li(李泉), Hong-Yi Pan(潘弘毅), Ji-Liang Qiu(邱纪亮), Wen-Zhuo Cao(曹文卓), Xi-Qian Yu(禹习谦), Hong Li(李泓) Artificial solid electrolyte interphase based on polyacrylonitrile for homogenous and dendrite-free deposition of lithium metal 2019 Chin. Phys. B 28 078202

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Artificial solid electrolyte interphase based on polyacrylonitrile for homogenous and dendrite-free deposition of lithium metal

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