China Automotive Battery Research Institute Co., Ltd. , Beijing 101407 , P. R. China.
Key Lab of Theory and Technology for Advanced Batteries Materials, College of Engineering , Peking University , Beijing 100871 , P. R. China.
ACS Appl Mater Interfaces. 2018 Jun 27;10(25):21349-21355. doi: 10.1021/acsami.8b06271. Epub 2018 Jun 14.
Lithium-rich layered oxides are promising cathode materials for high-energy-density lithium-ion batteries. However, the development of cathode materials based on these layered oxides has been limited by voltage fading, poor rate performance, and the low tap density of these materials. In this work, we prepared a material consisting of micrometer-scale spherical lithium-rich layered oxide particles with a three-dimensional conductivity network design and modified the surface of the primary particles with ruthenium. The as-obtained product with a maximum tap density of 2.1 g cm shows a superior high reversible capacity with 280 mA h·g at 0.1 C, a capacity retention of 98.1% after 100 cycles, and an outstanding rate capability. More importantly, enrichment of the primary particle surface with ruthenium can effectively suppress voltage decay. This cathode is feasible to construct high-energy and high-power lithium-ion batteries. This novel design may furthermore open the door to new material engineering applications for high-performance cathode materials.
富锂层状氧化物是高能量密度锂离子电池有前途的阴极材料。然而，基于这些层状氧化物的阴极材料的发展受到电压衰减、差的倍率性能和这些材料的低真密度的限制。在这项工作中，我们制备了一种由微米级球形富锂层状氧化物颗粒组成的材料，具有三维导电性网络设计，并对初级颗粒的表面进行了钌改性。所得到的最大真密度为 2.1 g·cm 的产物在 0.1 C 时表现出优异的高可逆容量为 280 mA·h·g，100 次循环后的容量保持率为 98.1%，并且具有出色的倍率性能。更重要的是，在初级颗粒表面富集钌可以有效地抑制电压衰减。这种阴极材料适用于构建高能量和高功率锂离子电池。这种新设计可能为高性能阴极材料的新材料工程应用开辟新的途径。
