2007, Volume 9, Issue 2
Strategic Study of CAE >> 2007, Volume 9, Issue 2
Recent Progress in the Key Materials for Li-S Polymer Secondary Batteries
Institute of Nuclear & New Energy Technology, Tsinghua University, Beijing 100084, China
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Abstract
A nano-scale sulfur polymer composite cathode material has been developed for Li/S polymer secondary batteries, and its cycle capacity is over 700 mAh/g when the lithium metal is used as the anode. Its discharge voltage is the half of that of LiCoO2, showing the exchangeability between the nano sulfur battery and LiCoO2 battery. Graphite/Sulfur cell works well. Nano-scale Cu/Sn alloy powder has been synthesized by a novel micro-emulsion process. Its cycling capacity is over300mAh桙g. Both Sn/C composite prepared by ball milling and Sn/C microspheric composite prepared by carbothermal reduction show good electrochemical performance. Lithium compensation of anode materials by Li2.6Co0.4N for the initial irreversible capacity paves the way to prepare large capacity anode materials. The successful preparation of Poly(AN-MMA)and Poly (AN-BuA) copolymers shows that the cost of gel electrolyte can be reduced. The advanced Li/S polymer secondary batteries will be developed in the near future.
Keywords
polymer ; nano sulfur composite ; gel electrolyte ; alloy anode ; lithium secondary battery
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