High-Performance Layered Ni-Rich Cathode Materials Enabled by Stress-Resistant Nanosheets

作者：Zhu, Hekang; Yang, Tingting; Lee, Pui-Kit; Yin, Zijia; Tang, Yu; Li, Tianyi; Gallington, Leighanne C.; Ren, Yang; Yu, Denis Y. W.^*; Liu, Qi^*

来源：ACS applied materials & interfaces, 2023.

DOI：10.1021/acsami.2c20405

• Ni-rich cathodes
• nanosheet grains
• cracking
• cycling stability
• diffusion rates

Layered O3-type transition metal oxides are promising cathode candidates for high-energy-density Li-ion batteries. However, the structural instability at the highly delithiated state and low kinetics at the fully lithiated state are arduous challenges to overcome. Here, a facile approach is developed to make secondary particles of Ni-rich materials with nanosheet primary grains. Because the alignment of the primary grains reduces internal stress buildup within the particle during charge-discharge and provides straightforward paths for Li transport, the as-synthesized Ni-rich materials do not undergo cracking upon cycling with higher overall Li+ ion diffusion rates. Specifically, a LiNi0.75Co0.14Mn0.11O2 cathode with nanosheet grains delivers a high reversible capacity of 206 mAh g-1 and shows ultrahigh cycling stability, e.g., 98% capacity retention over 500 cycles in a full cell with a graphite anode.