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 MEMS (such as micro-robots, micro-sensors) are rapidly developing in the direction of light, short, and multi-functional integration, which greatly promotes the high power density and high energy density of modern society. Demand for micro-energy storage devices with features such as flexibility and modular integration. Traditional lithium-ion capacitors have attracted much attention due to their high energy density and the high power density of supercapacitors. However, their sandwich stack structure Device configuration 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 microcapacitors use high-conductivity graphene as the current collector, high-voltage ion gel as the electrolyte, and nano-titanic acid. Lithium is a negative electrode and activated graphene is a positive electrode to construct a high-ion electron conduction planar interdigitated microelectrode, and then 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. , 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 after 98 cycles is 98.9%; high temperature electrochemical stability, can be 80° Stable operation under C conditions; and excellent mechanical flexibility, achieving substantially no attenuation in various bending and twisting states. In addition, the lithium ion microcapacitor exhibits good modular integration capability, eliminating the need for metal connectors, and is effective Regulate the output voltage and capacity of the output. Therefore, the work is to develop flexible, miniaturized, intelligent energy storage The device offers a new strategy.
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.
