期刊
SMALL
卷 18, 期 52, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202205887
关键词
CoC; O-2; (4); fast ion diffusion; intercalation; lithium-ion batteries; lithium-sulfur batteries; pseudocapacitance
类别
资金
- National Natural Science Foundation of China [21706196, 21905208]
- Zhejiang Natural Science Foundation [LZ20E010001]
- Zhejiang Provincial Special Support Program for High-level Talents [2019R52042]
This study synthesizes cuboid-like anhydrous CoC2O4 particles and investigates their application in lithium-ion and lithium-sulfur batteries. The results demonstrate that CoC2O4 can serve as a high-performance electrode material, delivering high reversible capacity, good rate capability, and outstanding cycling stability.
In this study, cuboid-like anhydrous CoC2O4 particles (CoC2O4-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 CoC2O4-HK delivers a high reversible capacity (approximate to 1360 mAh g(-1) at 0.1 A g(-1)), good rate capability (approximate to 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 CoC2O4-HK electrode, together with the reversible reaction of CoC2O4+2Li(+)+2e(-)-> Co+Li2C2O4 on discharging and charging. In addition, CoC2O4-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 CoC2O4/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 CoC2O4 as the high-performance electrode materials for rechargeable Li-ion and Li-S batteries.
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