Ren Yilun, Hu Libing, Chang Shaozhong, Ma Yujie, Wang Biao, Wu Hao, Li Fengqi, Yang Yurong, Tang Shaochun, Meng Xiangkang
National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, College of Engineering and Applied Sciences, Nanjing University, Jiangsu, 210093, China.
College of Chemistry and Chemical Engineering, Tarim University, Alar, 843300, China.
Small. 2024 Aug;20(34):e2400068. doi: 10.1002/smll.202400068. Epub 2024 Apr 9.
Lithium-sulfur (Li-S) batteries with high theoretical energy density (2600 Wh kg) are considered to be one of the most promising secondary batteries. However, the practical application of Li-S batteries is limited by the polysulfides shuttling and unstable lithium metal anodes. Herein, an asymmetric separator (CACNM@PP), composed of Co-Ni/MXene (CNM) on the cathode and Cu-Ag/MXene (CAM) on the anode for high-performance Li-S batteries is reported. For the cathode, CNM provides a synergistic effect by integrating Co, Ni, and MXene, resulting in strong chemical interactions and fast conversion kinetics for polysulfides. For the anode, CAM with abundant lithiophilicity active sites can lower the nucleation barrier of Li. Moreover, LiCl/LiF layers are generated in situ as an ion conductor layer during charging and discharging, inducing a uniform deposition of Li. Therefore, the assembled cells with the CACNM@PP separators harvest excellent electrochemical performance. This work provides novel insights into the development of commercially available high-energy density Li-S batteries with asymmetric separators.
具有高理论能量密度（2600瓦时/千克）的锂硫（Li-S）电池被认为是最有前景的二次电池之一。然而，锂硫电池的实际应用受到多硫化物穿梭和不稳定锂金属负极的限制。在此，报道了一种用于高性能锂硫电池的不对称隔膜（CACNM@PP），其由阴极上的钴-镍/碳化钛（CNM）和阳极上的铜-银/碳化钛（CAM）组成。对于阴极，CNM通过整合钴、镍和碳化钛提供协同效应，从而产生强烈的化学相互作用和多硫化物的快速转化动力学。对于阳极，具有丰富亲锂活性位点的CAM可以降低锂的成核势垒。此外，在充放电过程中原位生成LiCl/LiF层作为离子导体层，促使锂均匀沉积。因此，采用CACNM@PP隔膜组装的电池具有优异的电化学性能。这项工作为开发具有不对称隔膜的商用高能量密度锂硫电池提供了新的见解。
