期刊
CHEMICAL ENGINEERING JOURNAL
卷 450, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.137903
关键词
Integrated electrode; Polymer electrolyte; Ionic conductivity; Sodium ion batteries
资金
- Nanotechnology Platform Program of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [JPMXP09F-19-FA-0029]
- KAGENHI [19H02818]
- Iwatani Naoji Foundation
- National Natural Science Foundation of China [51772039, 51972293]
The improvement of solid-state batteries in terms of safety and energy density is significant for their application in power batteries. The interface matching of solid-state electrolytes and adapted electrode materials is crucial. This study designs a 3D integrated electrode using Cu2MoS4 electrode and polymer-in-salt solid electrolyte, showing excellent interface-contact compatibility and electrochemical performance.
The improvement of solid-state batteries (SSBs) in terms of safety performance and energy density has an unusual significance for it to apply to power batteries, and the interface matching of solid-state electrolytes and adapted electrode materials has become the key. Due to poor electrode-electrolyte interface contact in SSBs which could result in low ionic conductivity, we designed a 3D integrated electrode constructed from a Cu2MoS4 electrode grown in situ on the surface of copper foam with a polymer-in-salt solid electrolyte based on PVDF-HFP. The ion clusters formed by NaPF6 near the PVDF-HFP network structure can effectively shorten the Na+ transport path, and then adding 1-(4-cyanophenyl)-guanidine can also provide more ion transport routes by forming coordination bonds. The polymer electrolyte exhibited excellent ionic conductivity (1.67x10(-5) S cm(-1) at room temperature) and electrochemical stability (5.6 V vs Na vertical bar Na+). At the same time, it showed excellent stability during the cycle performance test of the symmetrical batteries, compared with the liquid electrolytes, the polymer-in-salt solid electrolytes were not short circuit under the same test conditions, indicating that the polymer-in-salt solid electrolytes can effectively inhibit the growth of Na dendrites. This 3D integrated electrode exhibited excellent interface-contact compatibility, mechanical stability, and electrochemical performance closed to that of liquid electrolytes and even outperformed liquid electrolytes at a high rate cycle.
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