【摘 要】
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Existing rechargeable batteries not only fail to meet the demand for high power applications but also cause heavy metal pollution.Li-ion capacitors(LICs),which
【机 构】
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MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage,State Key
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Existing rechargeable batteries not only fail to meet the demand for high power applications but also cause heavy metal pollution.Li-ion capacitors(LICs),which can achieve higher charging speeds and energy densities than supercapacitors,have attracted extensive attention.Nevertheless,sluggish Li-ion diffusion of the battery-type anode results in limited rate performance of LICs.Herein,high-performance LICs using both battery and capacitor type Mn2V207-graphene(MVO-G)anodes and hempstem-derivated activated carbon(HSAC)cathodes with a large surface area are first reported.In addition to high pseudocapacitance,the MVO-G possesses the advantage of fast Li+storage performance making it a suitable choice for advanced LIC anodes.Graphene is employed to enhance overall conduc-tivity and cycling stability leading to enhanced energy storage.The MVO-G//HSAC LICs exhibit a high energy density of 148.1 Wh kg-1 at a power density of 150 W kg-1 and 25 Wh kg-1 even at 15 kW kg-1.More importantly,the MVO-G//HSAC LICs also show excellent cycling stability of 90％after 15,000 cycles,which is expected for high performance energy storage systems.
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