Zhao Qinghe, Song Aoye, Ding Shouxiang, Qin Runzhi, Cui Yanhui, Li Shuning, Pan Feng
School of Advanced Materials, Peking University, Shenzhen Graduate School, Shenzhen, 518055, China.
Adv Mater. 2020 Dec;32(50):e2002450. doi: 10.1002/adma.202002450. Epub 2020 Nov 9.
Manganese oxides (MnO ) are promising cathode materials for various kinds of battery applications, including Li-ion, Na-ion, Mg-ion, and Zn-ion batteries, etc., due to their low-cost and high-capacity. However, the practical application of MnO cathodes has been restricted by some critical issues including low electronic conductivity, low utilization of discharge depth, sluggish diffusion kinetics, and structural instability upon cycling. Preintercalation of ions/molecules into the crystal structure with/without structural reconstruction provides essential optimizations to alleviate these issues. Here, the intrinsic advantages and mechanisms of the preintercalation strategy in enhancing electronic conductivity, activating more active sites, promoting diffusion kinetics, and stabilizing the structural integrity of MnO cathode materials are summarized. The current challenges related to the preintercalation strategy, along with prospects for the future research and development regarding its implementation in the design of high-performance MnO cathodes for the next-generation batteries are also discussed.
氧化锰（MnO）因其低成本和高容量，是用于各种电池应用（包括锂离子、钠离子、镁离子和锌离子电池等）的有前景的阴极材料。然而，MnO阴极的实际应用受到一些关键问题的限制，包括电子电导率低、放电深度利用率低、扩散动力学缓慢以及循环时的结构不稳定性。离子/分子在有/无结构重构的情况下预嵌入晶体结构提供了必要的优化以缓解这些问题。在此，总结了预嵌入策略在提高电子电导率、激活更多活性位点、促进扩散动力学以及稳定MnO阴极材料结构完整性方面的内在优势和机制。还讨论了与预嵌入策略相关的当前挑战，以及其在下一代电池高性能MnO阴极设计中的实施的未来研发前景。
