Performance of n-type silicon/silver composite anode material in lithium ion batteries: A study on effect of work function matching degreeProject supported by the China Postdoctoral Science Foundation (Grant No. 2016M592115), the Jiangxi Postdoctoral Foundation, China (Grant No. 2015KY12), the Fund from the Jiangxi Provincial Education Department, China (Grant No. 150184), and the Fund from Nanchang University, China (Grant No. CX2017006)

• Published in: Chinese physics B 2018-10, Vol.27 (10)
• Main Authors: Xu, Guo-Jun, Jin, Chen-Xin, Kong, Kai-Jie, Yang, Xi-Xi, Yue, Zhi-Hao, Li, Xiao-Min, Sun, Fu-Gen, Huang, Hai-Bin, Zhou, Lang
• Format: Article
• Language: English
• Subjects: contacts; lithium ion battery; silicon anode materials; work function matching
• ISSN: 1674-1056
• DOI: 10.1088/1674-1056/27/10/108201

In this paper, two types of silicon (Si) particles ball-milled from n-type Si wafers, respectively, with resistivity values of 1 Ω · cm and 0.001 Ω · cm are deposited with silver (Ag). The Ag-deposited n-type 1- Ω · cm Si particles (n1-Ag) and Ag-deposited n-type 0.001- Ω · cm Si particles (n0.001-Ag) are separately used as an anode material to assemble coin cells, of which the electrochemical performances are investigated. For the matching of work function between n-type 1- Ω · cm Si (n1) and Ag, n1-Ag shows discharge specific capacity of up to 683 mAh · g − 1 at a current density of 8.4 A · g − 1 , which is 40% higher than that of n0.001-Ag. Furthermore, the resistivity of n1-Ag is lower than half that of n0.001-Ag. Due to the mismatch of work function between n-type 0.001- Ω · cm Si (n0.001) and Ag, the discharge specific capacity of n0.001-Ag is 250.2 mAh · g − 1 lower than that of n1-Ag after 100 cycles.