Developed all-solid-state flexible planar lithium ion micro-capacitor

The team of Zhongshuai Wu, a researcher of the Dalian Institute of Chemicals of the Chinese Academy of Sciences, teamed up with Bao Xinhe's academician team and Yanbing He, an associate professor at the Shenzhen Graduate School of Qinghua University, to develop a solid-state lithium-ion surface with high energy density, good flexibility, excellent high temperature stability, and high degree of integration. Miniature capacitors. The related results were published in "Energy and Environmental Science."

The research team has pioneered the development of a new concept, high-performance all-solid-state flexible planar lithium-ion micro-capacitor without metal current collectors and conventional separators. The micro capacitor uses a highly conductive graphene as a current collector, a high voltage ion gel as an electrolyte, a lithium titanate anode as a negative electrode, and an activated graphene as a positive electrode to construct a high-ionic electron-conducting plane interdigitated microelectrode. All-solid-state lithium-ion micro-capacitors are assembled on one substrate.

The lithium ion microcapsules have an energy density as high as 53.5 mWh/cm3, which is higher than the currently reported lithium thin-film batteries and micro-super capacitors. At the same time, the lithium ion microcapsule has excellent cycle stability, the capacitance retention rate is 98.9% after 6000 cycles; its high temperature electrochemical stability can work stably under the condition of 80°C; its excellent mechanical flexibility in various bending and There is no attenuation of performance in the twisted state. In addition, the lithium-ion micro-capacitors exhibit good modular integration capabilities, eliminating the need for metal connections and effectively regulating output voltage and capacity.