Hard-carbon-stabilized Li–Si anodes for high-performance all-solid-state Li-ion batteries

Wenlin Yan, Zhenliang Mu, Zhixuan Wang, Yuli Huang, Dengxu Wu, Pushun Lu, Jiaze Lu, Jieru Xu, Yujing Wu, Tenghuan Ma, Ming Yang, Xiang Zhu, Yu Xia, Shaochen Shi, Liquan Chen, Hong Li and Fan Wu ()
Additional contact information
Wenlin Yan: Tianmu Lake Institute of Advanced Energy Storage Technologies
Zhenliang Mu: ByteDance Research
Zhixuan Wang: Tianmu Lake Institute of Advanced Energy Storage Technologies
Yuli Huang: Beijing Advanced Innovation Center for Materials Genome Engineering, Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Institute of Physics, Chinese Academy of Sciences
Dengxu Wu: Tianmu Lake Institute of Advanced Energy Storage Technologies
Pushun Lu: Tianmu Lake Institute of Advanced Energy Storage Technologies
Jiaze Lu: Tianmu Lake Institute of Advanced Energy Storage Technologies
Jieru Xu: Tianmu Lake Institute of Advanced Energy Storage Technologies
Yujing Wu: Tianmu Lake Institute of Advanced Energy Storage Technologies
Tenghuan Ma: Tianmu Lake Institute of Advanced Energy Storage Technologies
Ming Yang: Tianmu Lake Institute of Advanced Energy Storage Technologies
Xiang Zhu: Tianmu Lake Institute of Advanced Energy Storage Technologies
Yu Xia: ByteDance Research
Shaochen Shi: ByteDance Research
Liquan Chen: Tianmu Lake Institute of Advanced Energy Storage Technologies
Hong Li: Tianmu Lake Institute of Advanced Energy Storage Technologies
Fan Wu: Tianmu Lake Institute of Advanced Energy Storage Technologies

Nature Energy, 2023, vol. 8, issue 8, 800-813

Abstract: Abstract All-solid-state batteries (ASSBs) with Li metal anodes or Si anodes are promising candidates to achieve high energy density and improved safety, but they suffer from undesirable lithium dendrite growth or huge volume expansion, respectively. Here we synthesize a hard-carbon-stabilized Li–Si alloy anode in which sintering of Si leads to the transformation of micro-metre particles into dense continuum. A 3D ionic-electronic-conductive network composed of plastically deformable Li-rich phases (Li15Si4 and LiC6) that enlarges active area and relieves stress concentration is created in the anode, leading to improved electrode kinetics and mechanical stability. With the hard-carbon-stabilized Li-Si anode, full cells using LiCoO2 or LiNi0.8Co0.1Mn0.1O2 cathodes and Li6PS5Cl electrolyte achieve favourable rate capability and cycle stability. In particular, the ASSB with LiNi0.8Co0.1Mn0.1O2 at high loading of 5.86 mAh cm−2 delivers 5,000 cycles at 1 C (5.86 mA cm−2), demonstrating the potential of using hard-carbon-stabilized Li–Si alloy anodes for practical applications of ASSBs.

Date: 2023
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DOI: 10.1038/s41560-023-01279-8

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