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Isotropic Microstrain Relaxation in Ni-Rich Cathodes for Long Cycling Lithium Ion Batteries
ACS Nano ( IF 15.8 ) Pub Date : 2023-08-23 , DOI: 10.1021/acsnano.3c04773 Zhihong Wang 1 , Wu Wei 1 , Qiang Han 2 , Huawei Zhu 1 , Ling Chen 1 , Yanjie Hu 1, 2 , Hao Jiang 1, 2 , Chunzhong Li 1, 2
ACS Nano ( IF 15.8 ) Pub Date : 2023-08-23 , DOI: 10.1021/acsnano.3c04773 Zhihong Wang 1 , Wu Wei 1 , Qiang Han 2 , Huawei Zhu 1 , Ling Chen 1 , Yanjie Hu 1, 2 , Hao Jiang 1, 2 , Chunzhong Li 1, 2
Affiliation
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Developing isotropic-dominated microstrain relaxation is a vital step toward the enhancement of cyclic performance and thermal stability for high-energy-density Ni-rich cathodes. Here, a microstructure engineering strategy is employed for synthesizing the elongated primary particles radially aligned Ni-rich cathodes only by regulating the precipitation rates of cations and the distributions of flow field. The as-obtained cathode also exhibits an enlarged lattice distance and highly exposed (003) plane. The high aspect ratio and favorable atomic arrangement of primary particles not only enable isotropic strain relaxation for effectively suppressing microcrack formation and propagation, but also facilitate Li-ion diffusion with greatly reduced Li/Ni mixing. Consequently, it shows obvious superiority in the high-rate, long-cycle life, and thermal stability compared with the conventional counterparts. After modification, an exceptionally long life is achieved with a capacity retention of 90.1% at 1C and 84.3% at 5C after 1500 cycles within 3.0–4.3 V in a 1.5-Ah pouch cell. This work offers a universal strategy to achieve isotropic strain distribution for conveniently enhancing the durability of Ni-rich cathodes.
中文翻译：
长循环锂离子电池富镍阴极的各向同性微应变弛豫
开发各向同性主导的微应变弛豫是提高高能量密度富镍正极循环性能和热稳定性的重要一步。这里，采用微结构工程策略，仅通过调节阳离子的沉淀速率和流场分布来合成拉长的初级粒子径向排列的富镍阴极。所获得的阴极还表现出扩大的晶格距离和高度暴露的（003）面。初级粒子的高长径比和有利的原子排列不仅能够实现各向同性应变弛豫，从而有效抑制微裂纹的形成和扩展，而且有利于锂离子扩散，大大减少Li/Ni混合。因此，与传统同类产品相比，它在高倍率、长循环寿命和热稳定性方面表现出明显的优势。修改后，1.5-Ah 软包电池在 3.0-4.3 V 内循环 1500 次后，可实现超长的寿命，1C 时的容量保持率为 90.1%，5C 时的容量保持率为 84.3%。这项工作提供了一种实现各向同性应变分布的通用策略，以方便地提高富镍阴极的耐用性。
更新日期：2023-08-23
中文翻译：
长循环锂离子电池富镍阴极的各向同性微应变弛豫
开发各向同性主导的微应变弛豫是提高高能量密度富镍正极循环性能和热稳定性的重要一步。这里，采用微结构工程策略，仅通过调节阳离子的沉淀速率和流场分布来合成拉长的初级粒子径向排列的富镍阴极。所获得的阴极还表现出扩大的晶格距离和高度暴露的（003）面。初级粒子的高长径比和有利的原子排列不仅能够实现各向同性应变弛豫，从而有效抑制微裂纹的形成和扩展，而且有利于锂离子扩散，大大减少Li/Ni混合。因此，与传统同类产品相比，它在高倍率、长循环寿命和热稳定性方面表现出明显的优势。修改后，1.5-Ah 软包电池在 3.0-4.3 V 内循环 1500 次后，可实现超长的寿命，1C 时的容量保持率为 90.1%，5C 时的容量保持率为 84.3%。这项工作提供了一种实现各向同性应变分布的通用策略，以方便地提高富镍阴极的耐用性。
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