Carbon nanotubes and carbon fibers coated silicon particles and their applications for high-capacity and long-life anode of lithium ion batteries
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Title of Invention |
Carbon nanotubes and carbon fibers coated silicon particles and their applications for high-capacity and long-life anode of lithium ion batteries |
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Technology
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Silicon is one of the most promising anode materials for high-capacity Li-ion batteries due to its formation of silicon and lithium compound resulting in the highest known capacity. However, the lifetime of virgin silicon-based anode is short because the volume of silicon expands and shrinks leading to the breaking of silicon particles after repetitive charge/discharge cycles. Breaking of silicon particles results in the loss of electric contact of broken silicon particles with the current collector and the capability of further charging and discharging. In this invention, a novel silicon based anode is made of vertically carbon nanotube/carbon fibers coated silicon particles. Excellent performance of the anode for lithium ion batteries has been demonstrated. Carbon nanotubes/carbon fibers are grown on flake shaped silicon particles. Lithium ion battery anode made of carbon nanotube/carbon fibers coated silicon particles demonstrated steady charge-discharge capacity of 1200, 1600, and 2000 mAh per gram of silicon for more than 100 cycles. This performance is higher than the theoretical maximum capacity of 400mAh/g for conventional graphite anode by 300%, 400%, and 500%, respectively. Without the carbon nanotube/carbon fibers coating, lithium ion battery using silicon particles based anode loses its charging and discharing capacity rapidly even at much lower capacity. |
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Benefits |
Silicon based anode for lithium ion battery with more than 2000 mAh/g capacity and more than 100 cycles of stable charging and discharing has been invented by using carbon nanotube and carbon fiber coated flake shaped silicon particles. |
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Possible Applications/ Industry Categories |
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Contact Information |
Technology Transfer and Business Incubation Center, NCKU Contact person：Yi-Yin, Lin E-mail：ainlin@mail.ncku.edu.tw |
