Lanzhou Institute of Advanced Lithium-ion Hybrid Supercapacitor Research Progress

Lanzhou Institute of Advanced Lithium-ion Hybrid Supercapacitor Research Progress

Under the support of the "135" Key Cultivation Project of the Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, and the National Natural Science Foundation of China, the Laboratory of Clean Energy Chemistry and Materials of Lanzhou Institute of Chemical Industry has made new progress in the research of high energy density supercapacitors.

As a new type of energy storage device, a lithium ion hybrid supercapacitor has a higher energy density than a conventional supercapacitor, and therefore has received extensive attention from researchers and industry in recent years. However, the current reported lithium-ion hybrid capacitors have the disadvantage of insufficient power under high-power discharge conditions. The main reason is that there is a dynamic mismatch between the positive and negative electrode materials of hybrid capacitors.

Based on this, the researcher of Lanzhou Institute of Chemicals conducted in-depth research and analysis of the intrinsic structure and properties of various lithium electrode materials, and proposed a new idea to effectively solve the dynamic mismatch between the positive and negative electrode materials, that is, the use of tantalum capacitor characteristics The vanadium nitride electrode material replaces commonly used battery-type anode materials (such as graphite, lithium titanate, etc.).

The researchers successfully prepared a three-dimensional structure of vanadium nitride/graphene composites by further adding graphene, which greatly improved the specific capacity, kinetic performance, and cycle stability of the original vanadium nitride electrode material. On this basis, a vanadium nitride/graphene composite material was used as a negative electrode, and a high specific surface area porous carbon that had been independently developed in the earlier period was used as a positive electrode to assemble a lithium ion hybrid supercapacitor having both high energy density and high power density. The device has a working potential window of up to 4 V, an energy density of up to 162 Wh/kg, and good cycle stability, demonstrating good commercial application prospects, and providing new ideas and methods for designing and developing high specific energy supercapacitors. . This work was recently published online at Advanced Functional Materials.

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