期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 16, 页码 14180-14186出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b14840
关键词
carbon nanospheres; hollow structures; nitrogen-doping; porous materials; lithium-ion batteries
资金
- National Key Basic Research Program of China [2015CB351903]
- National Natural Science Foundation of China [51402282, 51373160, 21474095, 21476104, 21373197]
- Fundamental Research Funds for the Central Universities [WK3430000003]
N-doped carbon materials is of particular attraction for anodes of lithium-ion batteries (LIBs) because of their high surface areas, superior electrical conductivity, and excellent mechanical strength, which can store energy by adsorption/desorption of Li+ at the interfaces between the electrolyte and electrode. By directly carbonization of zeolitic imidazolate framework-8 nanospheres synthesized by an emulsion-based interfacial reaction, we obtained N-doped hollow carbon nanospheres with tunable shell thickness (20 nm to solid sphere) and different N dopant concentrations (3.9 to 21.7 at %). The optimized anode material possessed a shell thickness of 20 nm and contained 16.6 at % N dopants that were predominately pyridinic and pyrrolic. The anode delivered a specific capacity of 2053 mA h g(-1) 100 mA g(-1) and 879 mA h g(-1) 5 A g(-1) for 1000 cycles, implying a superior cycling stability. The improved electrocheinical performance can be ascribed to (1) the Li+ adsorption dominated energy storage mechanism prevents the volume change of the eketrode materials, (2) the hollow nanostructure assembled by the nanometersized primary particles prevents the agglomeration of the nanoparticles and favors for Li+ diffusion, (3) the optimized N-dopant concentration and configuration facilitate the adsorption of Li+; and (4) the graphitic carbon nanostructure good electrical conductivity.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据