Polysulfide-driven low charge overpotential for aprotic lithium-oxygen batteries

被引:4
作者
Zhou, Yin [1 ,2 ,3 ]
Lyu, Zhiyang [2 ]
Liu, Zhenjie [4 ]
Dai, Wenrui [2 ,3 ]
Guo, Rui [2 ]
Yang, Jinlin [2 ,3 ]
Cui, Xinhang [3 ,5 ]
Zhao, Yong [6 ,7 ]
Lin, Ming [8 ]
Lai, Min [1 ]
Peng, Zhangquan [4 ]
Chen, Wei [2 ,3 ,5 ]
机构
[1] Nanjing Univ Informat Sci & Technol, Sch Phys & Optoelect Engn, Nanjing 210044, Jiangsu, Peoples R China
[2] Natl Univ Singapore, Dept Chem, 3 Sci Dr 3, Singapore 117543, Singapore
[3] Natl Univ Singapore Suzhou, Res Inst, Suzhou 215123, Peoples R China
[4] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Electroanalyt Chem, Changchun 130022, Jilin, Peoples R China
[5] Natl Univ Singapore, Dept Phys, 2 Sci Dr 3, Singapore 117543, Singapore
[6] Nanchang Univ, Inst Adv Study, Nanchang 330031, Jiangxi, Peoples R China
[7] Nanchang Univ, Dept Phys, Nanchang 330031, Jiangxi, Peoples R China
[8] ASTAR, Inst Mat Res & Engn, 2 Fusionopolis Way Innovis, Singapore, Singapore
基金
新加坡国家研究基金会; 中国国家自然科学基金;
关键词
LI-O-2; BATTERIES; CATALYTIC-ACTIVITY; CYCLING STABILITY; RATIONAL DESIGN; CATHODE; ELECTROLYTES; ARCHITECTURE; REDUCTION; PEROXIDE;
D O I
10.1039/c9ta00267g
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Developing Li-O-2 batteries with high-rate and long-cycle performance remains a major challenge due to the high charge overpotential induced by the insulating discharge products of Li2O2. Herein, we develop a strategy to achieve high-rate and excellent cycle performance Li-O-2 batteries by introducing sacrificial lithium polysulfide in aprotic electrolyte to realize ultralow charge overpotential, where the discharge products of Li2O2 have been replaced with lithium thiosulfate. In a demonstration study using Li2S6 during the discharge process, O-2 receives electrons and reacts with Li2S6 to form thiosulfate intermediates, which further accept electrons and convert Li2S6 to Li2S2 and Li2S4O6. The charge process is divided into three stages: the oxidation of low-order lithium polysulfide to high-order polysulfide, Li2S2O3 to Li2S4O6, and high-order polysulfide to sulfur, respectively, resulting in low charge overpotential. Despite gradual consumption of Li2S6 by the solvent, the electrochemical performance significantly increases. At a high current density of 0.5 A g(-1), the battery with CNTs as the cathode and Li2S6 as the electrolyte additive demonstrates an excellent cycle performance of 147 cycles with a low initial charge overpotential of 0.19 V at a fixed capacity of 500 mA h g(-1). This study provides a promising strategy to design high-rate and long-cycle performance of Li-O-2 batteries by altering the discharge products.
引用
收藏
页码:8777 / 8784
页数:8
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