Supremely elastic gel polymer electrolyte enables a reliable electrode structure for silicon-based anodes

Qingquan Huang, Jiangxuan Song, Yue Gao, Daiwei Wang, Shuai Liu, Shufu Peng, Courtney Usher, Alan Goliaszewski and Donghai Wang ()
Additional contact information
Qingquan Huang: The Pennsylvania State University
Jiangxuan Song: The Pennsylvania State University
Yue Gao: The Pennsylvania State University
Daiwei Wang: The Pennsylvania State University
Shuai Liu: The Pennsylvania State University
Shufu Peng: Ashland Specialty Ingredients
Courtney Usher: Ashland Specialty Ingredients
Alan Goliaszewski: Ashland Specialty Ingredients
Donghai Wang: The Pennsylvania State University

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: Abstract Silicon-based materials are promising anodes for next-generation lithium-ion batteries, owing to their high specific capacities. However, the huge volume expansion and shrinkage during cycling result in severe displacement of silicon particles and structural collapse of electrodes. Here we report the use of a supremely elastic gel polymer electrolyte to address this problem and realize long-term stable cycling of silicon monoxide anodes. The high elasticity of the gel polymer electrolyte is attributed to the use of a unique copolymer consisting of a soft ether domain and a hard cyclic ring domain. Consequently, the displacement of silicon monoxide particles and volume expansion of the electrode were effectively reduced, and the damage caused by electrode cracking is alleviated. A SiO|LiNi0.5Co0.2Mn0.3O2 cell shows 70.0% capacity retention in 350 cycles with a commercial-level reversible capacity of 3.0 mAh cm−2 and an average Coulombic efficiency of 99.9%.

Date: 2019
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DOI: 10.1038/s41467-019-13434-5

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