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首页> 外文期刊>Advanced Functional Materials >New Insight into Microstructure Engineering of Ni-Rich Layered Oxide Cathode for High Performance Lithium Ion Batteries
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New Insight into Microstructure Engineering of Ni-Rich Layered Oxide Cathode for High Performance Lithium Ion Batteries

机译：高性能锂离子电池微观结构工程新洞察力

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摘要

Ni-rich layered LiNixCoyMn1-x-yO2 (LNCM) with Ni content over 90% is considered as a promising lithium ion battery (LIB) cathode, attributed by its low cost and high practical capacity. However, Ni-rich LNCM inevitably suffers rapid capacity fading at a high state of charge due to the mechanochemical breakdown; in particular, the microcrack formation has been regarded as one of the main culprits for Ni-rich layered cathode failure. To address these issues, Ni-rich layered cathodes with a textured microstructure are developed by phosphorous and boron doping. Attributed by the textured morphology, both phosphorous- and boron-doped cathodes suppress microcrack formation and show enhanced cycle stability compared to the undoped cathode. However, there exists a meaningful capacity retention difference between the doped cathodes. By adapting the various analysis techniques, it is shown that the boron-doped Ni-rich layered cathode displays better cycle stability not only by its ability to suppress microcracks during cycling but also by its primary particle morphology that is reluctant to oxygen evolution. The present work reveals that not only restraint of particle cracks but also suppression of oxygen release by developing the oxygen stable facets is important for further improvements in state-of-the-art Li ion battery Ni-rich layered cathode materials.
机译：Ni含量超过> 90％的Ni含量的层状LINIXCOYMN1-X-YO2（LNCM）被认为是有前途的锂离子电池（LIB）阴极，其归因于其低成本和高实用能力。然而，由于机械化学崩溃，Ni-Rich的LNCM不可避免地在高电荷状态下逐渐消退;特别地，微裂纹形成已被认为是Ni的层状阴极衰竭的主要罪魁祸首之一。为了解决这些问题，通过磷和硼掺杂开发了具有纹理微观结构的Ni的分层阴极。由纹理的形态归因于磷和硼掺杂的阴极抑制微裂纹形成并与未掺杂的阴极相比显示增强的循环稳定性。然而，掺杂阴极之间存在有意义的容量保持差异。通过调整各种分析技术，表明硼掺杂的Ni的层状阴极不仅通过其在循环期间抑制微裂纹的能力而且通过其初次颗粒形态来显示更好的循环稳定性。本作者揭示了不仅通过显影氧稳定的刻面的颗粒裂纹而且抑制氧释放，对于进一步改进的锂离子电池Ni的层状阴极材料是重要的。

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