Na-Rich工程公司针对高稳定性Li-Rich层状氧化物阴极进行多尺度缺陷集成,ACS Applied Materials & Interfaces

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Na-Rich工程公司针对高稳定性Li-Rich层状氧化物阴极进行多尺度缺陷集成
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-02-08 , DOI: 10.1021/acsami.0c19040
Qun Liu ₁ , Te Xie ₁ , Qingshui Xie ₁ , Wei He ₁ , Yinggan Zhang ₁ , Hongfei Zheng ₁ , Xiangjun Lu ₂ , Wensheng Wei ₃ , Baisheng Sa ₄ , Laisen Wang ₁ , Dong-Liang Peng ₁

Affiliation

富含锂的锰基（LRM）层状氧化物因其高比容量（> 250 mAh g ^–1）被认为是下一代高能量密度锂离子电池（LIB）最有希望的阴极材料之一。）。但是，它们在循环期间还会经历严重的容量衰减，严重的电压衰减和差的速率能力。在本文中，在Li _1.2 Mn _0.54 Ni _0.13 Co _0.13 O _2中实现了多尺度缺陷集成，包括表面涂层，次表面缺陷构造和体掺杂。阴极材料，采用溶胶-凝胶法，通过富钠工程简化。这种多尺度设计可以显着提高电极材料的Li ⁺离子的体积和表面结构稳定性以及扩散速率。具体来说，经过400次循环后，在1C的设计阴极材料下可提供201 mAh g ^–1的出色比容量，这意味着89.0％的大容量保持率。同时，平均电压可保持高达3.13 V，较大的电压保持率为89.6％，能量密度保持在627.4 Wh kg ^–1。进行了原位X射线衍射（XRD），异位透射电子显微镜（TEM）研究和密度泛函理论（DFT）计算，以解释LRM阴极的电化学性能大大提高。我们相信，该策略将为将来的LRM阴极材料的研究提供有意义的参考。

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Multiscale Deficiency Integration by Na-Rich Engineering for High-Stability Li-Rich Layered Oxide Cathodes

Lithium-rich manganese-based (LRM) layered oxides are considered as one of the most promising cathode materials for next-generation high-energy-density lithium-ion batteries (LIBs) because of their high specific capacity (>250 mAh g^–1). However, they also go through severe capacity decay, serious voltage fading, and poor rate capability during cycling. Herein, a multiscale deficiency integration, including surface coating, subsurface defect construction, and bulk doping, is realized in a Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ cathode material by facile Na-rich engineering through a sol–gel method. This multiscale design can significantly improve the bulk and surface structural stability and diffusion rate of Li⁺ ions of electrode materials. Specifically, an outstanding specific capacity of 201 mAh g^–1 is delivered at 1C of the designed cathode material after 400 cycles, relating to a large capacity retention of 89.0%. Meanwhile, the average voltage is retained up to 3.13 V with a large voltage retention of 89.6% and the energy density is maintained at 627.4 Wh kg^–1. In situ X-ray diffraction (XRD), ex situ transmission electron microscopy (TEM) investigations, and density functional theory (DFT) calculations are conducted to explain the greatly enhanced electrochemical properties of a LRM cathode. We believe that this strategy would be a meaningful reference of LRM cathode materials for the research in the future.

更新日期：2021-02-24

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