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3D Net-like GO-d-Ti3C2T x MXene Aerogels with Catalysis/Adsorption Dual Effects for High-Performance Lithium–Sulfur Batteries

High theoretical specific capacity and rich resources in nature make sulfur an ideal cathode material for lithium–metal batteries. However, the shuttle effect and sluggish reduction reaction kinetics of lithium polysulfides (LiPSs) seriously affect the performance of the batteries. Here, we report G...

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Published in:ACS applied materials & interfaces 2021-11, Vol.13 (46), p.55235-55242
Main Authors: Tang, Xianyi, Gan, Ruiyi, Tan, Lianqiao, Tong, Cheng, Li, Cunpu, Wei, Zidong
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Gan, Ruiyi
Tan, Lianqiao
Tong, Cheng
Li, Cunpu
Wei, Zidong
description High theoretical specific capacity and rich resources in nature make sulfur an ideal cathode material for lithium–metal batteries. However, the shuttle effect and sluggish reduction reaction kinetics of lithium polysulfides (LiPSs) seriously affect the performance of the batteries. Here, we report GO-d-Ti3C2T x MXene aerogels with a novel three-dimensional (3D) reticular structure that served as sulfur host cathode materials for lithium–sulfur batteries (LiSBs), which benefits adsorption/catalytic conversion of LiPSs simultaneously. The dissolved LiPSs can be rapidly captured through chemisorption and then catalyzed into insoluble Li2S by low-coordinated-state Ti on the d-Ti3C2T x MXene surface. The combination of adsorption and catalysis enormously improves the capacity and cycling performance of LiSBs. At an S mass loading of 1.5 mg cm–2, the cell with the S@GM0.4 composite electrode achieves excellent cycling performance. The discharge specific capacity of 1039 mA h g–1 (1.56 mA h cm–2) decays to 542.9 mA h g–1 after 1000 cycles with a capacity fading rate of 0.048% per cycle at 0.5 C. Even at an S mass loading of 4.88 mg cm–2, an areal capacity of 4.3 mA h cm–2 can be achieved at 0.2 C.
doi_str_mv 10.1021/acsami.1c17881
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title 3D Net-like GO-d-Ti3C2T x MXene Aerogels with Catalysis/Adsorption Dual Effects for High-Performance Lithium–Sulfur Batteries
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