A design strategy of large grain lithium-rich layered oxides for lithium-ion batteries cathode

作者：Jiang Xiong; Wang Zhenhua^*; Rooney David; Zhang Xiaoxue; Feng Jie; Qiao Jinshuo; Sun Wang; Sun Kening

来源：Electrochimica Acta, 2015, 160: 131-138.

DOI：10.1016/j.electacta.2015.02.061

• Large grain
• Lithium ion battery
• Cathode material
• Cyclic stability

Li-rich materials are considered the most promising for Li-ion battery cathodes, as high capacity can be achieved. However, poor cycling stability is a critical drawback that leads to poor capacity retention. Here a strategy is used to synthesize a large-grain lithium-rich layered oxides to overcome this difficulty without sacrificing rate capability. This material is designed with micron scale grain with a width of about 300 nm and length of 1-3 mu m. This unique structure has a better ability to overcome stress-induced structural collapse caused by Li-ion insertion/extraction and reduce the dissolution of Mn ions, which enable a reversible and stable capacity. As a result, this cathode material delivered a highest discharge capacity of around 308 mAh g (1) at a current density of 30 mAg (1) with retention of 88.3% (according to the highest discharge capacity) after 100 cycles, 190 mAhg (1) at a current density of 300 mA g (1) and almost no capacity fading after 100 cycles. Therefore, Lithium-rich material of large-grain structure is a promising cathode candidate in Lithium-ion batteries with high capacity and high cycle stability for application. This strategy of large grain may furthermore open the door to synthesize the other complex architectures for various applications.

• 出版日期2015-4-1
• 单位北京理工大学