Dalian Institute of Materials Research progresses in the research of all-solid-state flexible plane lithium ion micro-capacitors
[ China Instrument Network Instrument R&D ] Recently, Wu Zhongshuai, a researcher at the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, teamed up with the Academician Bao Xinhe of the Chinese Academy of Sciences and He Yanbing, Associate Professor of the Shenzhen Graduate School of Tsinghua University to develop a high Energy density, good flexibility, excellent high temperature stability, and highly integrated all-solid-state planar lithium-ion micro-capacitors. Related research results were published in Energy Environ. Sci.
In recent years, wearables, portable electronic devices, and micro-electromechanical systems (such as micro-robots and micro-sensors) are rapidly developing in the direction of lightweight, small size, and multi-function integration, which has greatly promoted high power density and high energy density in modern society. Demand for micro-energy storage devices featuring features such as flexibility and modular integration. Conventional lithium ion capacitors have attracted attention because of their high energy density 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 has taken the lead in the international development of a new concept of all-solid-state flexible planar lithium-ion micro-capacitors. The micro capacitor uses a highly conductive graphene as a current collector, a high-voltage ion gel as an electrolyte, a nano-lithium titanate as a negative electrode, and an activated graphene as a positive electrode to construct a high-ionic electron-conducting plane interdigitated microelectrode. A solid-state lithium-ion micro-capacitor is assembled on a substrate. The lithium ion micro-capacitor has a high energy density of 53.5 mWh/cm3, which is higher than the lithium thin-film batteries and micro-super capacitors currently reported. At the same time, the lithium ion microcapsule has excellent cycle stability, the capacitance retention rate is 98.9% after 6000 cycles, has high temperature electrochemical stability, can work stably under 80°C conditions, and has excellent mechanical flexibility in The performance is basically not attenuated in various bending and twisting states. 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. Therefore, this work provides a new strategy for the development of flexible, miniaturized and intelligent energy storage devices.
The above work was funded by the National Natural Science Foundation of China, the National Key R&D Program, and the National Youth 1000-Year Plan.
(Original Title: Research Progress of All Solid State Flexible Plane Lithium Ion Micro Capacitors of Dalian Institute of Chemical Industry)