Li Siying, Lee Jung-Hun, Hwang Soo Min, Kim Young-Jun
School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology, Liuzhou, 545616, China.
SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, 16419, Republic of Korea.
Nano Converg. 2023 Jan 13;10(1):4. doi: 10.1186/s40580-022-00353-3.
Dual-ion Li metal batteries based on non-flammable SO-in-salt inorganic electrolytes ( Li-SO batteries) offer high safety and energy density. The use of cupric oxide (CuO) as a self-activating cathode material achieves a high specific capacity with cost-effective manufacturing in Li-SO batteries, but its cycle retention performance deteriorates owing to the significant morphological changes of the cathode active materials. Herein, we report the catalytic effect of carbonaceous materials used in the cathode material of Li-SO batteries, which act as templates to help recrystallize the active materials in the activation and conversion reactions. We found that the combination of oxidative-cyclized polyacrylonitrile (PAN) with N-doped carbonaceous materials and multi-yolk-shell CuO (MYS-CuO) nanoclusters as cathode active materials can significantly increase the specific capacity to 315.9 mAh g (93.8% of the theoretical value) at 0.2 C, which corresponds to an energy density of 1295 Wh kg, with a capacity retention of 84.46% at the 200th cycle, and the cathode exhibited an atypical blossom-like morphological change.
基于不可燃的盐包SO无机电解质的双离子锂金属电池（锂-硫电池）具有高安全性和能量密度。在锂-硫电池中，使用氧化铜（CuO）作为自激活阴极材料，通过具有成本效益的制造工艺可实现高比容量，但由于阴极活性材料的显著形态变化，其循环保持性能会恶化。在此，我们报道了锂-硫电池阴极材料中使用的含碳材料的催化作用，这些含碳材料在活化和转化反应中作为模板帮助活性材料重结晶。我们发现，氧化环化聚丙烯腈（PAN）与氮掺杂含碳材料以及多壳层CuO（MYS-CuO）纳米团簇作为阴极活性材料的组合，在0.2 C时可将比容量显著提高至315.9 mAh g（为理论值的93.8%），对应的能量密度为1295 Wh kg，在第200次循环时容量保持率为84.46%，并且阴极呈现出非典型的花朵状形态变化。
