Lean electrolyte usage in lithium-sulfur battery(LSB)meets the demand of the high energy density.However,lean condition makes the electrolyte-related interface discrete,leading to retardation of ion transfer that depends on interfaces.Consequently,electrochemical reactions face restraint.Herein,lithium polyacrylate acid(LiPAA)with short-chain anions(molecular weight of 2000)is introduced into the cathode.Because of the polysulfide(PS)-philic instinct of the short-chain PAA anions,short-chain PS is captured inside of the cathode.In addition,LiPAA supplies Li+to the short-chain PS captured.The strong interaction between Li2S4 and LiPAA effectively decreases Li2S4 migration to the anode during discharging.In a sense,the ion mass transfer pattern is thus changed comparing to traditional long-way mode between cathode and anode.Galvanostatic intermittent titration technique(GITT)proves that the interfacial reaction resistance is greatly decreased in the region where Li2Sx(x≤4)reduction contributes most.In the same time,the reversibility of electrochemical reduction/oxidation is improved.Owing to the accelerated Li2Sx(x≤4)reduction,Li implanting of only 0.3 wt.％plus O introduction up to 1.4 wt.％enables the LSB perform well even with 1/4 of regular electrolyte dosage(5μL mg-1)and high-sulfur loading(4.2 mg cm-2),increasing its rate capacity C0.8/0.5 from 52.6％(without the LiPAA)to 92.3％(with the LiPAA)as well as a capacity of 518.7 mAh g-1 after 400 cycles at 0.8 mA cm-2.

Jizong Zhang;Mingming Chen;Yu Si;Jian Guo;Tianli Wu;Chengyang Wang;Xiaolei Wang

Key Laboratory for Green Chemical Technology of MOE,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China;Collaborative Innovation Center of Chemical Science and Engineering(Tianjin),Tianjin University,Tianjin 300072,China;Department of Chemical and Materials Engineering,University of Alberta,Edmonton AB T6G 1H9,Canada

能源与环境材料（英文）

[1]Jizong Zhang;Mingming Chen;Yu Si;Jian Guo;Tianli Wu;Chengyang Wang;Xiaolei Wang-.LiPAA with Short-chain Anion Facilitating Li2Sx(x≤4)Reduction in Lean-electrolyte Lithium-sulfur Battery)[J].能源与环境材料（英文）,2022(03):877-882

LiPAA,Li2Sx,instinct,Li+to,Li2S4

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