Wu Zhongshuai research group of Dalian Institute of chemistry, Chinese Academy of Sciences has made new progress in the research of all solid flexible planar lithium ion micro capacitors
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Last Update: 2018-06-17
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Source: Internet
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Author: User
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In recent years, wearable, portable electronic devices and micro electro mechanical systems (such as micro robots, micro sensors) are developing rapidly in the direction of light, short and multi-functional integration, which greatly promotes the demand of modern society for micro energy storage devices with high power density, high energy density, flexibility, modular integration and other characteristics Traditional lithium-ion capacitors have attracted much attention due to their high energy density of lithium-ion batteries and high power density of supercapacitors However, the device configuration of sandwich stack structure greatly limits its mechanical flexibility, high temperature performance and modular integration ability Recently, Wu Zhongshuai, researcher of Dalian Institute of chemical engineering, Chinese Academy of Sciences, and he Yanbing, associate professor of Shenzhen Graduate School of Tsinghua University A kind of all solid state planar lithium ion micro capacitor with high energy density, good flexibility, excellent high temperature stability and high integration has been developed Relevant research results were published on energy energy energy SCI (DOI: 10.1039/c8ee00855h) The research team took the lead in developing a new concept of all solid flexible planar lithium-ion micro capacitor in the world The micro capacitor uses high conductivity graphene as collector, high voltage ion gel as electrolyte, nano lithium titanate as negative electrode and living graphene as the cathode to construct a plane cross finger microelectrode with high ionic electron conduction, and then a solid lithium ion micro capacitor is assembled on a substrate The lithium-ion micro capacitor has a high energy density of 53.5 MWh / cm 3, which is higher than the reported lithium film battery and micro super capacitor At the same time, the lithium-ion micro capacitor has excellent cycle stability, with a capacity retention rate of 98.9% after 6000 cycles; high-temperature electrochemical stability, which can work stably at 80 ℃; and excellent mechanical flexibility, which basically has no degradation under various bending and twisting conditions In addition, the lithium-ion micro capacitor shows good modularity and integration ability, and can effectively control the output voltage and capacity without metal connector Therefore, this work provides a new strategy for the development of flexible, miniaturized and intelligent energy storage devices The above work was supported by NSFC, national key R & D plan, National Youth thousand talents plan and other projects.
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