Mahamad Yusoff Nor Fazila, Idris Nurul Hayati, Md Din Muhamad Faiz, Majid Siti Rohana, Harun Noor Aniza, Rahman Md Mokhlesur
Energy Storage Research Group, Faculty of Ocean Engineering Technology and Informatics, Universiti Malaysia Terengganu, 21030 Kuala Nerus, Terengganu, Malaysia.
Department of Electrical and Electronic Engineering, Faculty of Engineering, National Defence University of Malaysia, Kem Sungai Besi, 57000 Kuala Lumpur, Malaysia.
ACS Omega. 2020 Nov 3;5(45):29158-29167. doi: 10.1021/acsomega.0c03888. eCollection 2020 Nov 17.
MnO is considered to be a promising anode material for sodium-ion batteries (SIBs) because of its low cost, high capacity, and enhanced safety. However, the inferior cyclic stability of the MnO anode is a major challenge for the development of SIBs. In this study, a one-step solvothermal method was established to produce nanostructured MnO with an average particle size of 21 nm and a crystal size of 11 nm. The MnO obtained exhibits a unique architecture, consisting of small clusters composed of numerous tiny nanoparticles. The MnO material could deliver high capacity (522 mAh g at 100 mA g), reasonable cyclic stability (158 mAh g after 200 cycles), and good rate capability (73 mAh g at 1000 mA g) even without further carbon coating, which is a common exercise for most anode materials so far. The sodium insertion/extraction was also confirmed by a reversible conversion reaction by adopting an ex situ X-ray diffraction technique. This simple, cost-effective, and environmentally friendly synthesis technique with good electrochemical performance shows that the MnO nanoparticle anode has the potential for SIB development.
由于成本低、容量高且安全性增强，MnO被认为是一种有前景的钠离子电池（SIBs）负极材料。然而，MnO负极较差的循环稳定性是SIBs发展的一个主要挑战。在本研究中，建立了一种一步溶剂热法来制备平均粒径为21 nm、晶体尺寸为11 nm的纳米结构MnO。所获得的MnO呈现出独特的结构，由许多微小纳米颗粒组成的小簇构成。即使没有进一步的碳包覆（这是迄今为止大多数负极材料常用的做法），MnO材料仍能提供高容量（在100 mA g时为522 mAh g）、合理的循环稳定性（200次循环后为158 mAh g）和良好的倍率性能（在1000 mA g时为73 mAh g）。通过采用非原位X射线衍射技术的可逆转化反应也证实了钠的插入/脱出。这种具有良好电化学性能的简单、经济高效且环境友好的合成技术表明，MnO纳米颗粒负极具有用于SIBs发展的潜力。
