Lin Yan, Välikangas Juho, Sliz Rafal, Molaiyan Palanivel, Hu Tao, Lassi Ulla
Research Unit of Sustainable Chemistry, Faculty of Technology, University of Oulu, 90570 Oulu, Finland.
Kokkola University Consortium Chydenius, University of Jyvaskyla, 67100 Kokkola, Finland.
Materials (Basel). 2023 Apr 15;16(8):3116. doi: 10.3390/ma16083116.
The advantages of cobalt-free, high specific capacity, high operating voltage, low cost, and environmental friendliness of spinel LiNiMnO (LNMO) material make it one of the most promising cathode materials for next-generation lithium-ion batteries. The disproportionation reaction of Mn leads to Jahn-Teller distortion, which is the key issue in reducing the crystal structure stability and limiting the electrochemical stability of the material. In this work, single-crystal LNMO was synthesized successfully by the sol-gel method. The morphology and the Mn content of the as-prepared LNMO were tuned by altering the synthesis temperature. The results demonstrated that the LNMO_110 material exhibited the most uniform particle distribution as well as the presence of the lowest concentration of Mn, which was beneficial to ion diffusion and electronic conductivity. As a result, this LNMO cathode material had an optimized electrochemical rate performance of 105.6 mAh g at 1 C and cycling stability of 116.8 mAh g at 0.1 C after 100 cycles.
尖晶石LiNiMnO（LNMO）材料具有无钴、高比容量、高工作电压、低成本和环境友好等优点，使其成为下一代锂离子电池最有前景的正极材料之一。Mn的歧化反应会导致 Jahn-Teller 畸变，这是降低材料晶体结构稳定性和限制其电化学稳定性的关键问题。在这项工作中，通过溶胶-凝胶法成功合成了单晶LNMO。通过改变合成温度来调节所制备的LNMO的形貌和Mn含量。结果表明，LNMO_110材料表现出最均匀的颗粒分布以及最低浓度的Mn，这有利于离子扩散和电子传导。因此，这种LNMO正极材料在1 C时具有105.6 mAh g的优化电化学倍率性能，在0.1 C下循环100次后具有116.8 mAh g的循环稳定性。
