Investigation of Spray Conditions and erformances of Cold-sprayed Pure Silicon Anodes for Lithium Secondary Batteries
Currently, graphite is used for anodes of the lithium ion battery. The higher capacity of a battery with the lithium alloy anode requires the development of a larger theoretical electrochemical capacity than graphite. Silicon is a promising anode material, having a theoretical capacity more than 10 times that of the graphite used in these lithium alloy batteries. There are two common methods of fabricating silicon anodes: direct deposition techniques such as electron beam deposition and sputtering; and slurry coating of silicon particles with a binder. Alternative methods are being investigated. One of such methods is cold spray. In this study, numerical simulation of, and experiments investigating, cold spray conditions and the performances of cold-sprayed silicon anodes are presented. Silicon was cold-sprayed on copper foil substrates using three different starting materials (with particle sizes of 4.65 μm, 6.74 μm and 9.63 μm). First cycle efficiency was about 90％. Charge capacity initially improves with cycling (up to the 10 th cycle). This is probably due to better electrolyte soaking during the first several cycles. A decrease in charge capacity is observed upon further cycling.
K. Sakaki S. Shinkai Y. Shimizu
Shinshu University, Nagano City, Nagano, Japan
国际会议
北京
英文
2007-05-14（万方平台首次上网日期，不代表论文的发表时间）