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Addressing Unfavorable Influence of Particle Cracking with a Strengthened Shell Layer in Ni-Rich Cathodes
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-04-15 , DOI: 10.1021/acsami.1c05535
Meng Liu 1, 2 , Zhongming Ren 3 , Deyu Wang 2, 3, 4 , Haitao Zhang 2 , Yujing Bi 2 , Cai Shen 2 , Bingkun Guo 1, 4
Affiliation  

Ni-rich layered materials are widely accepted as pivotal cathode materials to realize low-cost high-energy-density batteries. However, they still suffer from the intrinsic mechanically induced degradation due to the large lattice deformation. Here, we fabricate a strengthened shell layer on polycrystalline secondary particles to address the unfavorable influence of particle cracking instead of suppressing their bulky pulverization. This tough layer, constructed via welding LiNi0.8Co0.1Mn0.1O2 primary particles with a Nb-based ceramic, increases Young’s modulus of the particles 2.6 times. This layer allows the particles work properly with the intact spherical morphology even after bulk cracking. It seems that this tough skin stops the bulky flaws growing into perforated fissures and keeps the electrodes from quick polarization. This approach demonstrates that, besides addressing the intrinsic challenges directly, appropriate particle engineering is another efficient way to exploit the potentials of Ni-rich cathodes and power batteries made out of them.

中文翻译:

解决富镍阴极中强化壳层对颗粒开裂的不利影响

富镍层状材料被广泛用作枢轴阴极材料,以实现低成本的高能量密度电池。然而,由于大的晶格变形,它们仍然遭受固有的机械诱导的降解。在这里,我们在多晶二次粒子上制造了强化的壳层,以解决粒子开裂的不利影响,而不是抑制其庞大的粉碎。通过焊接LiNi 0.8 Co 0.1 Mn 0.1 O 2构造的坚硬层带有Nb基陶瓷的初生颗粒可将颗粒的杨氏模量提高2.6倍。该层使颗粒即使在整体开裂后也能以完整的球形形态正常工作。看来,这种坚韧的皮肤阻止了大的缺陷长成穿孔的裂缝,并阻止了电极的快速极化。这种方法表明,除了直接解决内在的挑战外,适当的粒子工程技术是另一种有效利用富镍阴极和由其制成的动力电池潜力的有效方法。
更新日期:2021-04-29
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