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An in situ chemically and physically confined sulfur-polymer composite for lithium sulfur battery with carbonate-based electrolyte

Jingjing Ma  Zhiqing Lu  Lei Xue  Yuanchao Li  Guangri Xu  
【摘要】:Lithium sulfur(Li-S)battery has been considered as one of the most promising energy storage systems for its high theoretical energy density(~2600 Wh kg~(-1))and the low cost of sulfur.~([1])However,its application is still hindered by some special issues.The major one is the"shuttling effect"caused by lithium polysulfide(Li_2S_n,4n≤8).~([2])Generally,cyclo-S_8containing composite cathodes undergo a"solid-liquid-solid"reaction mechanism through Li_2S_n(4n≤8)intermediates to generate the final product Li_2S in ether-based electrolytes.The dissolution of polysulfide during repeating discharge/charge processes is inevitable.In contrast,small sulfur molecules(S_(2-4))composites exhibit a"solid-solid"reaction mechanism between S_(2-4)and Li_2S.~([3,4])Since both the S_(2-4) and the products(Li_2S_2/Li_2S)are insoluble in the electrolyte,the"shuttling effect"can be essentially eliminated.More attractively,Li-S cell with this kind of cathode can operate in commercial carbonate-based electrolyte.Herein,an in situ chemically and physically confined sulfur-polymer composite(SPANI)is reported as cathode of Li-S battery by one step thermal treatment of sulfur and PANI.During the synthesis procedure,short sulfur unites generated through the cleavage of S_8 rings would react with the bonds of PANI and be confined in the pores synchronously.As a result,S_(2-4) was entrapped in a conductive skeleton through both covalent bonding and physical confinement.This SPANI composite exhibits excellent electrochemical properties in the carbonate-based electrolyte,as shown in Fig 1.

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