首页|Coordination bonds reinforcing mechanical strength of silicon anode to improve the electrochemical stability
Coordination bonds reinforcing mechanical strength of silicon anode to improve the electrochemical stability
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The severe volumetric expansion and poor con-ductivity of silicon when used as anode in lithium-ion bat-teries present challenges in maintaining the stability of electrochemical performance.Herein,the binding between silicon nanoparticles and carbon nanotubes(CNTs)is achieved by the utilization of sodium alginate(SA),which is then strengthened by the coordination between Ca2+and the carboxyl group(-COO-)of SA,resulting in a stable con-ductive network with ionic transport pathway.The consoli-dated binding relationship enables silicon-based anode material to possess high mechanical strength and strong deformation resistance,preventing the separation of silicon from CNTs network.Consequently,this silicon-based anode material demonstrates a discharge specific capacity of 811 mAh·g-1 after 100 cycles at a current density of 1 A·g-1,and exhibits high rate performance,with a discharge specific capacity of 1612 mAh·g-1 at 2 A·g-1.
Jin-Huan Li、Hong-Qiang Xu、Min Wu、Quan Du、Yong-Bo Kuang、Bo Yin、Hai-Yong He
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Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China
University of Chinese Academy of Sciences,Beijing 101400,China
Chemistry and Chemical Engineering College,Gannan Normal University,Ganzhou 341000,China
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