New Sn-Cu/C composite anode materials with high cyclic stability for Lithium ion battery

17th IUMRS International Conference in Asia

Huang, Zhaowen^1 ; Xiao, Wenping^1 ; Tang, Benqin^1 ; Hu, Shejun^2 ; Ru, Qiang^2

College of Electronic and Information Engineering, Shunde Polytechnic, Foshan

528300, China^1

School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou

510006, China^2

关键词: Composite anodes;    Core shell structure;    High cyclic stabilities;    Interstitial sites;    Irreversible capacity loss;    Reversible capacity;    Structure design;    Volume expansion;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/182/1/012008/pdf
DOI  :  10.1088/1757-899X/182/1/012008

来源: IOP

【 摘 要 】

Sn-Cu/C anode material with core-shell structure was obtained, in which the crystallization of Sn-Cu alloy was weakened. The results show that the weakening of the crystallization decreases the binding force on the interstitial sites and is benefit for the inserting and escaping of the lithium ions. And "Core-shell" structure design can effectively disperse the Sn-Cu alloy particles and leave room for the volume expansion of Sn-Cu alloy. Furthermore, the volume change is controlled within the "core-shell" structure. Through these methods, Sn-Cu/C composite anode material with high cyclic stability was obtained, whose reversible capacity was 450 mAh g-1, without any capacity loss till the 200thcycle. The volume change and irreversible capacity loss of Sn-based anode materials can be partly solved by the weakening of the crystallization and "core-shell" structure design.