微型多孔材料
锂(药物)
阳极
材料科学
杂原子
碳纤维
电容器
储能
电化学
电池(电)
阴极
电极
化学工程
纳米技术
复合材料
电压
有机化学
戒指(化学)
化学
功率(物理)
物理化学
内分泌学
工程类
物理
复合数
医学
量子力学
作者
Tong Li,Jianjun Zhang,Chongxing Li,Han Zhao,Jing Zhang,Zhao Qian,Longwei Yin,Rutao Wang
标识
DOI:10.1007/s40843-021-2047-x
摘要
Lithium-ion capacitors (LICs), consisting of a battery-like negative electrode and a capacitive porous-carbon positive electrode, deliver more than twice the energy density of electric double-layer capacitors. However, their wide application suffers from low energy density and reduced cycle life at high rates. Herein, hierarchical meso—microporous carbon nanospheres with a highly disordered structure and nitrogen/phosphorous co-doped properties were synthesized through a facile template method. Such hierarchical porous structure facilitates rapid ion transport, and the highly disordered structure and high heteroatom content provide abundant active sites for Li+ charge storage. Electrochemical experiments demonstrated that the carbon nanosphere anode delivers large reversible capability, greatly improves rate capability and exhibits excellent cycle stability. An LIC fabricated with the carbon nanosphere anode and an activated carbon cathode yields a high energy density of 103 W h kg−1, an extremely high power density of 44,630 W kg−1, and long-term cyclability of over 10,000 cycles. This work presents how structural control of carbon materials at the nano/atomic scale can significantly enhance electrochemical performance, enabling new opportunities for the design of high-performance energy-storage devices.
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