阳极
材料科学
锂(药物)
介孔材料
超级电容器
电极
阴极
电容
粒度
功率密度
碳纤维
化学工程
纳米技术
复合材料
功率(物理)
化学
复合数
生物化学
物理
物理化学
工程类
催化作用
医学
量子力学
内分泌学
作者
Hu-Jun Zhang,Qingxuan Jia,Ling‐Bin Kong
出处
期刊:ACS applied nano materials
[American Chemical Society]
日期:2021-11-16
卷期号:4 (11): 12514-12526
被引量:4
标识
DOI:10.1021/acsanm.1c03043
摘要
A lithium-ion capacitor (LIC) is a device with the dual characteristics of lithium-ion batteries (LIBs) and supercapacitors (SCs), but there is a serious dynamic imbalance between the positive and negative materials. Here, in the research work, γ-Mo2N nanobelts with different grain sizes and mesopore sizes have been prepared to study deeply the electrode dynamics. The results reveal that the reduction of the grain size and mesopore size will lead to a sharp increase in capacitance contribution, excellent rate performance, and structural stability. This is attributed to that the reduction of the grain/mesopore size will promote the oxidation–reduction reaction of the electrode material. Considering this advantage, a high-performance LIC is constructed with a γ-Mo2N-700 anode and a hierarchical porous activated carbon (AC) cathode. This device can achieve the highest energy density of 93.81 Wh kg–1 and a power density of 7513.68 W kg–1, and the excellent specific capacity of up to 87.16% is maintained after 1000 cycles. This work mainly introduces the two parameters of grain size and mesopore size to explore the structure–activity relationship that affects the performance of LIC anode materials, which provides an analysis method for the difference in lithium storage performance.
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