5:45 PM - EN02.13.06
Rational Design of Cathode Interface for Wide Temperature All-Solid-State Batteries
Sixu Deng1,Changhong Wang1,Xueliang Sun1
Western University1
Show Abstract
Inorganic all-solid-state lithium-ion batteries (ASSLIBs) are considered as a promising candidate for next-generation energy storage devices that can meet the safety requirements of electric vehicles by utilizing nonflammable solid-state electrolytes (SSEs).[1, 2] However, the poor interfacial compatibility in composite cathodes (SSE/cathode/carbon/current collector) is challenging the stable delivery of electrochemical performance.[3, 4] Our research mainly focuses on the development of interfacial engineering strategies to address the challenges at the internal and external interfaces in the composite cathodes targeting high-performance ASSLIBs. [5-7] In this talk, three parts will be included. Firstly, I will review our previous studies. For example, at the SE/cathode interface, we designed a dual-functional Li3PO4 (LPO) modification to suppress both the side-reactions and contact loss at the SSE/cathode interface.[8] We also developed a surface-cleaning strategy to investigate the underlying degradation mechanism at SSE/cathode interface.[9] At the SSE/carbon interface, a poly(3,4-ethylenedioxythiophene) (PEDOT) modification is designed as a semiconductive additive for composite cathodes.[10] The modified ASSLIB demonstrates a competitive rate capacity, which is 10 times greater than that of the bare cathode. Secondly, I will introduce our recent work, focusing on the current collector interface. Our study found that the interfacial stability at the current collector interface is highly dependent on the temperatures. At the end of this talk, I will introduce our work on low-temperature inorganic ASSLIBs. Our study revealed that manipulating the electronic conductivity in the composite cathodes is the key factor that determines the electrochemical performance at low temperatures.
References
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