Zhang Weiqi, Zhang Wenchao, Yao Jing, Lu Huiqing, Zhang Xitian, Wu LiLi
Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin, China.
Front Chem. 2022 Sep 30;10:1020538. doi: 10.3389/fchem.2022.1020538. eCollection 2022.
A mixed-dimensional VCT/TiCT composite interlayer was successfully prepared to tackle severe polysulfide (LiPS) shuttling and sluggish sulfur redox kinetics for high-performance lithium-sulfur batteries. In the unique nanoarchitecture, two-dimensional TiCT nanosheets served as a stable skeleton with superb electronic conductivity, good mechanical strength, and high polysulfide adsorption, whereas one-dimensional VCT nanorods played a crucial role in chemisorbing LiPSs and catalyzing the conversion of LiPSs due to their high polarity and electrocatalysis. With the synergistic effect of VCT and TiCT composite nanostructures, the cells with the mixed-dimensional VCT/TiCT composite interlayer showed an impressive long-term cycling stability and small capacity decay rate of 0.062% per cycle over 600 cycles at 1 C and exhibited an outstanding rate capability of 935.3 mAh·g at 2 C.
成功制备了一种混合维度的VCT/TiCT复合中间层，以解决高性能锂硫电池中严重的多硫化物（LiPS）穿梭和缓慢的硫氧化还原动力学问题。在独特的纳米结构中，二维TiCT纳米片作为稳定的骨架，具有出色的电子导电性、良好的机械强度和高多硫化物吸附能力，而一维VCT纳米棒由于其高极性和电催化作用，在化学吸附LiPSs和催化LiPSs的转化中起着关键作用。在VCT和TiCT复合纳米结构的协同作用下，具有混合维度VCT/TiCT复合中间层的电池表现出令人印象深刻的长期循环稳定性，在1 C下600次循环中每循环的容量衰减率仅为0.062%，并在2 C下展现出935.3 mAh·g的出色倍率性能。
