High-rate lithium-ion battery performance of a ternary sea urchin-shaped CoNiO_(2)@NiP_(6)Mo_(18)/CNTs composites  

作　　者：Li-ping Cui Shuang Sun Kai Yu Shu Zhang Mei-lin Wang Jia-jia Chen Bai-bin Zhou 

机构地区：[1]Key Laboratory for Photonic and Electronic Bandgap Materials,Ministry of Education,School of Chemistry and Chemical Engineering,Harbin Normal University,Harbin 150025,Heilongjiang,China [2]State Key Laboratory of Physical Chemistry of Solid Surfaces,Department of Chemistry,College of Chemistry and Chemical Engineering,Collaborative Innovation Centre of Chemistry for Energy Materials,Xiamen University,Xiamen 361005,Fujian,China

出　　处：《Journal of Energy Chemistry》2024年第9期516-525,共10页能源化学（英文版）

基　　金：supported by the National Science Foundation of China(22171061,21771046,and 22272143);the 2020 Central Government's Plan to Support the Talent Training Project of the Reform and Development Fund of Local Universities(2020GSP03);the Natural Science Foundation of Heilongjiang Province of China(ZD2021B002);the Fundamental Research Funds for the Central Universities(20720220009).

摘　　要：Bimetallic oxides are attractive anode materials for lithium-ion batteries(LIBs)due to their large theoretical capacity.However,the low conductivity,short cycle life,and poor rate capability are the bottlenecks for their further applications.To overcome above issues,the basket-like polymolybdate(NiP_(6)Mo_(18))and carbon nanotubes(CNTs)were uniformly embedded on the urchin-shaped CoNiO_(2)nanospheres to yield a ternary composites CoNiO_(2)@NiP_(6)Mo_(18)/CNTs via electrostatic adsorption.The multi-level morphology of urchin spinules accelerates the diffusion rate of Li^(+);CNT improves the conductivity and enhances cycle stability of the material;and heteropoly acid contributes more redox activity centres.Thus,CoNiO_(2)@NiP_(6)Mo_(18)/CNTs as an anode of LIBs exhibits a high initial capacity(1396.7 mA h g^(−1)at 0.1 A g^(−1)),long-term cycling stability(750.2 mA h g^(−1)after 300 cycles),and rate performance(450.3 mA h g^(−1)at 2 A g^(−1)),which are superior to reported metallic oxides anode of LIBs.The density functional theory(DFT)and kinetic mechanism suggest that CoNiO_(2)@NiP_(6)Mo_(18)/CNTs delivers an outstanding pseudocapacitance and rapid Li^(+)diffusion behaviors,which is due to the rich surface area of the urchin-like CoNiO_(2)with the uniform embeddedness of NiP_(6)Mo_(18)and CNTs.This study provides a new idea for optimizing the performance of bimetallic oxides and developing high-rate lithium-ion battery composites.

关 键 词：Bi-metal oxides Transition metal oxides POLYOXOMETALATES Nanocomposite LIBs 

分 类 号：TM912[电气工程—电力电子与电力传动] TB332[一般工业技术—材料科学与工程]