PVC disulfide （2SPVC） was synthesized by solution crosslink and its molecular structure was confirmed by infrared spectrum. 2SPVC＇s specific area is 36.1 m^2·g^-1 tested by stand BET method, and granularity ex...PVC disulfide （2SPVC） was synthesized by solution crosslink and its molecular structure was confirmed by infrared spectrum. 2SPVC＇s specific area is 36.1 m^2·g^-1 tested by stand BET method, and granularity experiment gives out the particle size of d0.5 = 11.3 μm. With SEM （Scanning Electron Microscope） experiment the surface morphology and particle shape of 2SPVC were observed. Cyclic voltammetry （scan rate： 0.5 mV · s^-1） shows that 2SPVC experience an obvious S-S redox reaction in charge-discharge process. When 2SPVC was used as cathode material for secondary lithium battery in a 1 mol·L^-1 solution of lithium bis（trifluoromethylsulfonyl） imide （Li（CF3SO2）2N） in a 5：45：50 volume ratio mixture of o-xylene （oxy）, diglyme （DG） and dimethoxymethane （DME） at 30℃, the first discharge capacity of 2SPVC is about 400.3 mAh·g^-1 which is very close to its theoretical value （410.5 mAh ·g^-1） at a constant discharge current of 15 mA·g^-1. It can retain at about 346.1 mAh ·g^-1 of discharge capacity after 30 charge-discharge cycles. So 2SPVC is a very promising cathode candidate for rechargeable lithium batteries.展开更多
文摘PVC disulfide （2SPVC） was synthesized by solution crosslink and its molecular structure was confirmed by infrared spectrum. 2SPVC＇s specific area is 36.1 m^2·g^-1 tested by stand BET method, and granularity experiment gives out the particle size of d0.5 = 11.3 μm. With SEM （Scanning Electron Microscope） experiment the surface morphology and particle shape of 2SPVC were observed. Cyclic voltammetry （scan rate： 0.5 mV · s^-1） shows that 2SPVC experience an obvious S-S redox reaction in charge-discharge process. When 2SPVC was used as cathode material for secondary lithium battery in a 1 mol·L^-1 solution of lithium bis（trifluoromethylsulfonyl） imide （Li（CF3SO2）2N） in a 5：45：50 volume ratio mixture of o-xylene （oxy）, diglyme （DG） and dimethoxymethane （DME） at 30℃, the first discharge capacity of 2SPVC is about 400.3 mAh·g^-1 which is very close to its theoretical value （410.5 mAh ·g^-1） at a constant discharge current of 15 mA·g^-1. It can retain at about 346.1 mAh ·g^-1 of discharge capacity after 30 charge-discharge cycles. So 2SPVC is a very promising cathode candidate for rechargeable lithium batteries.
