Creep-type all-solid-state cathode achieving long life

Xiaolin Xiong, Ting Lin, Chunxi Tian, Guoliang Jiang, Rong Xu (), Hong Li, Liquan Chen and Liumin Suo ()
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Xiaolin Xiong: Institute of Physics, Chinese Academy of Science
Ting Lin: Institute of Physics, Chinese Academy of Science
Chunxi Tian: Institute of Physics, Chinese Academy of Science
Guoliang Jiang: Institute of Physics, Chinese Academy of Science
Rong Xu: Xi’an Jiaotong University
Hong Li: Institute of Physics, Chinese Academy of Science
Liquan Chen: Institute of Physics, Chinese Academy of Science
Liumin Suo: Institute of Physics, Chinese Academy of Science

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Electrochemical-mechanical coupling poses enormous challenges to the interfacial and structural stability but create new opportunities to design innovative all-solid-state batteries from scratch. Relying on the solid-solid constraint in the space-limited domain structure, we propose to exploit the lithiation-induced stress to drive the active materials creep, thereby improving the structural integrity. For demonstration, we fabricate the creep-type all-solid-state cathode using creepable Se material and an all-in-one rigid ionic/electronic conducting Mo6Se8 framework. As indicated by the in-situ experiment and numerical simulation, this cathode presents unique capabilities in improving interparticle contact and avoiding particle fracture, leading to its superior electrochemical performance, including a superior long-cycle life of more than 3000 cycles at 0.5 C and a high volumetric energy density of 2460 Wh/L at the cathode level. We believe this innovative strategy to utilize mechanics to boost the electrochemical performance could shed light on the future design of all-solid-state batteries for practical applications.

Date: 2024
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DOI: 10.1038/s41467-024-48174-8

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