假电容
动力学
电化学
锂(药物)
材料科学
离子
电化学动力学
无机化学
化学工程
电极
化学
超级电容器
有机化学
物理化学
内分泌学
工程类
物理
医学
量子力学
作者
Zhiming Zhou,Peirong Lin,Shiqiang Zhao,Huile Jin,Yudan Qian,an Chen Xi,Xinyue Tang,Qingcheng Zhang,Daying Guo,Shun Wang
出处
期刊:Small
[Wiley]
日期:2022-11-07
卷期号:18 (52)
被引量:23
标识
DOI:10.1002/smll.202205887
摘要
In this study, cuboid-like anhydrous CoC2 O4 particles (CoC2 O4 -HK) are synthesized through a potassium citrate-assisted hydrothermal method, which possess well-crystallized structure for fast Li+ transportation and efficient Li+ intercalation pseudocapacitive behaviors. When being used in lithium-ion batteries, the as-prepared CoC2 O4 -HK delivers a high reversible capacity (≈1360 mAh g-1 at 0.1 A g-1 ), good rate capability (≈650 mAh g-1 at 5 A g-1 ) and outstanding cycling stability (835 mAh g-1 after 1000 cycles at 1 A g-1 ). Characterizations illustrate that the Li+ -intercalation pseudocapacitance dominates the charge storage of CoC2 O4 -HK electrode, together with the reversible reaction of CoC2 O4 +2Li+ +2e- →Co+Li2 C2 O4 on discharging and charging. In addition, CoC2 O4 -HK particles are also used together with carbon-sulfur composite materials as the electrocatalysts for lithium-sulfur (Li-S) battery, which displays a gratifying sulfur electrochemistry with a high reversibility of 1021.5 mAh g-1 at 2 C and a low decay rate of 0.079% per cycle after 500 cycles. The density functional theory (DFT) calculations show that CoC2 O4 /C can regulate the adsorption-activation of reaction intermediates and therefore boost the catalytic conversion of polysulfides. Therefore, this work presents a new prospect of applying CoC2 O4 as the high-performance electrode materials for rechargeable Li-ion and Li-S batteries.
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