Zhang Dan, Zhang Chunyan, Huo Zhe, Sun Jia, Liu Guangyin, Liu Xiaodi, Yu Chuang
College of Chemistry and Pharmaceutical Engineering, Nanyang Normal University, Nanyang 473061, China.
State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
Molecules. 2024 Sep 11;29(18):4306. doi: 10.3390/molecules29184306.
The utilization of MnO anodes with high storage capacity is significantly hindered by rapid capacity fading and inadequate rate capability, stemming from substantial volume fluctuations and low electrical conductivity. Crafting a composite comprising sulfur and fluorine co-modified MnO nanoparticles integrated with sulfur and nitrogen co-doped carbon matrices promises enhanced electrochemical performance yet poses formidable obstacles. Here, we present a straightforward synthetic strategy for in situ growth of sulfur and fluorine co-modified MnO nanoparticles onto sulfur and nitrogen co-doped carbon scaffolds. This integration effectively mitigates volume variations and enhances electrical conductivity. As a result, the SF-MnO/SNC composite demonstrates remarkable cycling stability and rate capability when employed as a lithium-ion battery anode. Remarkably, it achieves a high reversible capacity of 975 mAh g¹ after 80 cycles at 0.1 A g¹ and retains a substantial capacity of 498 mAh g¹ even at a high rate of 2.0 A g¹. The concise synthesis method and exceptional rate properties render the SF-MnO/SNC composite a promising anode material for lithium-ion batteries. The strategy of simultaneously doping oxides and carbon will bring new ideas to the research of oxide anodes.
具有高存储容量的MnO阳极的应用因容量快速衰减和倍率性能不足而受到显著阻碍，这源于大量的体积波动和低电导率。制备一种包含硫和氟共修饰的MnO纳米颗粒与硫和氮共掺杂碳基体的复合材料有望提高电化学性能，但也面临巨大障碍。在此，我们提出一种直接的合成策略，用于在硫和氮共掺杂的碳支架上原位生长硫和氟共修饰的MnO纳米颗粒。这种整合有效地减轻了体积变化并提高了电导率。结果，SF-MnO/SNC复合材料在用作锂离子电池阳极时表现出显著的循环稳定性和倍率性能。值得注意的是，在0.1 A g⁻¹下循环80次后，它实现了975 mAh g⁻¹的高可逆容量，即使在2.0 A g⁻¹的高倍率下也保持498 mAh g⁻¹的大容量。简洁的合成方法和优异的倍率性能使SF-MnO/SNC复合材料成为一种有前途的锂离子电池阳极材料。同时掺杂氧化物和碳的策略将为氧化物阳极的研究带来新的思路。
