Liu Zhedong, Zhang Jingchao, Luo Jiawei, Guo Zhaoxin, Jiang Haoran, Li Zekun, Liu Yuhang, Song Zijing, Liu Rui, Liu Wei-Di, Hu Wenbin, Chen Yanan
School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, People's Republic of China.
School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, People's Republic of China.
Nanomicro Lett. 2024 Jun 6;16(1):210. doi: 10.1007/s40820-024-01436-y.
Nickel-rich layered oxide LiNiCoMnO (NCM, x + y + z = 1) is the most promising cathode material for high-energy lithium-ion batteries. However, conventional synthesis methods are limited by the slow heating rate, sluggish reaction dynamics, high energy consumption, and long reaction time. To overcome these challenges, we first employed a high-temperature shock (HTS) strategy for fast synthesis of the NCM, and the approaching ultimate reaction rate of solid phase transition is deeply investigated for the first time. In the HTS process, ultrafast average reaction rate of phase transition from NiCoMn(OH) to Li- containing oxides is 66.7 (% s), that is, taking only 1.5 s. An ultrahigh heating rate leads to fast reaction kinetics, which induces the rapid phase transition of NCM cathodes. The HTS-synthesized nickel-rich layered oxides perform good cycling performances (94% for NCM523, 94% for NCM622, and 80% for NCM811 after 200 cycles at 4.3 V). These findings might also assist to pave the way for preparing effectively Ni-rich layered oxides for lithium-ion batteries.
富镍层状氧化物LiNiCoMnO（NCM，x + y + z = 1）是高能锂离子电池最具前景的正极材料。然而，传统合成方法受到加热速率慢、反应动力学迟缓、高能耗和长反应时间的限制。为克服这些挑战，我们首次采用高温冲击（HTS）策略快速合成NCM，并首次深入研究了接近最终的固相转变反应速率。在HTS过程中，从NiCoMn(OH)到含锂氧化物的超快平均相变反应速率为66.7（% s），即仅需1.5秒。超高加热速率导致快速的反应动力学，从而引发NCM正极的快速相变。经HTS合成的富镍层状氧化物具有良好的循环性能（在4.3 V下循环200次后，NCM523为94%，NCM622为94%，NCM811为80%）。这些发现也可能有助于为有效制备锂离子电池用富镍层状氧化物铺平道路。
