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

Xiong Jiang, Zhenhua Wang*, David Rooney, Xiaoxue Zhang, Jie Feng, Jinshuo Qiao, Wang Sun, Kening Sun

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

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 μm. 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 mA g-1 with retention of 88.3% (according to the highest discharge capacity) after 100 cycles, 190 mAh g-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.

Original languageEnglish
Pages (from-to)131-138
Number of pages8
JournalElectrochimica Acta
Volume160
Early online date09 Feb 2015
DOIs
Publication statusPublished - 01 Apr 2015

Keywords

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

ASJC Scopus subject areas

  • Electrochemistry
  • Chemical Engineering(all)

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