The Investigation of Cus/Cnts with Synergistic Effect of Physical and Chemical Immobilization to Lithium Polysulfides for High-Performance Li–S Batteries
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E-Book
Title:
The Investigation of Cus/Cnts with Synergistic Effect of Physical and Chemical Immobilization to Lithium Polysulfides for High-Performance Li–S Batteries
Description:
The shuttle effect in Lithium–sulfur batteries (LSBs) has a detrimental impact on their cycle performance. In this study, the flexible CuS/carbon nanotube (CNT) interlayer was found to have good physical interception and chemisorption conversion functions for lithium polysulfides, and its addition to LSBs can improve the reaction kinetics and alleviate the shuttle effect. Specifically, the LSBs with PECuS/CNTs show an initial discharge capacity (1242.4 mAh g−1, 0.5 C) and retain a long-term cycling stability (568.5 mAh g−1 after 1000 cycles, 2 C), corresponding to an ultra-low capacity fading rate of only 0.05% per cycle. The LSBs with PE@CuS/CNTs exhibited an excellent resistance to self-discharge. The capacity retention after standing for 120 hours was 85.8% in a fully charged state, and discharge capacity remains close to 950 mAh g−1 during additional cycles to 150 cycles. Additionally, at a high S loading of 4.5 mg cm−2 and low E/S of 9.4 mL g−1, the LSBs still deliver a high capacity around 500 mAh g−1 and stable cycling performances