Recently, Wu Zhongshuai, a researcher at the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, teamed up with the Chinese Academy of Sciences academician Bao Xinhe and the team and Tsinghua University Shenzhen Graduate School Associate Professor He Yanbing to develop a high energy density, good flexibility and excellent High temperature stability and highly integrated all solid state planar lithium ion microcapacitors. Related research results are published in Energy Environ. Sci.
In recent years, wearable, portable electronic devices and micro-electromechanical systems (such as micro-robots, micro-sensors) are rapidly developing in the direction of light, short, and multi-functional integration, which greatly promotes modern society for high power density, high energy density, The need for flexible energy storage devices with features such as flexibility and modular integration. Conventional lithium ion capacitors have attracted attention due to their high energy density of lithium ion batteries and the high power density of supercapacitors. However, the device configuration of its sandwich stack structure greatly limits its mechanical flexibility, high temperature performance, and modular integration capabilities.
Recently, the research team pioneered the development of a new concept of all-solid-state flexible planar lithium-ion microcapacitors. The microcapacitor uses a high-conductivity graphene as a current collector, a high-voltage ion gel as an electrolyte, a nano-titanium titanate as a negative electrode and an activated graphene as a positive electrode to construct a high-ion electron-conducting planar interdigitated microelectrode, and further An all-solid lithium-ion microcapacitor is assembled on one substrate. The lithium ion microcapacitor has a high energy density of 53.5 mWh/cm3, which is higher than the currently reported lithium thin film battery and micro supercapacitor. At the same time, the lithium ion microcapacitor has excellent cycle stability, the capacitance retention rate is 98.9% after 6000 cycles, has high temperature electrochemical stability, can work stably at 80 ° C; and has excellent mechanical flexibility. There is essentially no attenuation in performance in various bending and twisting states. In addition, the lithium ion microcapacitor exhibits a good modular integration capability, eliminating the need for a metal connector and effectively regulating the output voltage and capacity of the output. Therefore, this work provides a new strategy for the development of flexible, miniaturized, intelligent energy storage devices.
The above work was funded by the National Natural Science Foundation of China, the National Key Research and Development Program, and the National Youth Thousand Talents Program.
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