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High-Performance Layered Ni-Rich Cathode Materials Enabled by Stress-Resistant Nanosheets
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-02-01 , DOI: 10.1021/acsami.2c20405
Hekang Zhu 1, 2 , Tingting Yang 1 , Pui-Kit Lee 2 , Zijia Yin 1 , Yu Tang 1 , Tianyi Li 3 , Leighanne C Gallington 3 , Yang Ren 1 , Denis Y W Yu 2, 4 , Qi Liu 1, 5
Affiliation  

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.

中文翻译:

由耐应力纳米片实现的高性能层状富镍阴极材料

层状 O3 型过渡金属氧化物是高能量密度锂离子电池的有前途的阴极候选材料。然而,高度脱锂状态下的结构不稳定性和完全锂化状态下的低动力学是需要克服的艰巨挑战。在这里,开发了一种简便的方法来制造具有纳米片初级晶粒的富镍材料的二次粒子。由于初级晶粒的排列减少了充放电过程中颗粒内的内应力累积,并为 Li 传输提供了直接的路径,因此合成后的富镍材料在循环时不会发生开裂,具有更高的总 Li + 离子扩散速率。具体地,a LiNi 0.75 Co 0.14 Mn 0.11 O 2具有纳米片颗粒的正极可提供 206 mAh g –1的高可逆容量,并显示出超高的循环稳定性,例如,在具有石墨负极的全电池中,500 次循环后的容量保持率为 98%。
更新日期:2023-02-01
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