Surface Doping to Enhance Structural Integrity and Performance of Li‐Rich Layered Oxide

Abstract

The Li‐rich layer‐structured oxides are regarded as one of the most promising cathode materials for their high energy density but suffer from severe problems such as capacity fading, poor rate performance, and continuous potential dropping. These issues are addressed here by surface doping of niobium (Nb) and other heavy ions in a Li‐rich Mn‐based layered oxide, Li1.2Mn0.54Ni0.13Co0.13O2. The doped ions are verified to be located in the Li‐layer near the oxide surface; they bind the slabs via the strong NbO bonds and “inactivate” the surface oxygen, enhancing the structural stability. The specific capacity of the modified oxide reaches 320 mAh g−1 in the initial cycle, 94.5% of which remains after 100 cycles. More importantly, the average discharge potential drops only by 136 mV in this process. The findings of this study illustrate the importance of inactivating the surface oxygen in suppressing the cation mixing in the bulk, providing an effective strategy for designing high‐performance Li‐rich cathode materials.

Document Details

Document Type
Pub Defense Publication
Publication Date
Oct 03, 2018
Source ID
10.1002/aenm.201802105

Entities

People

  • G. Lu
  • Kai Chen
  • Liang Zhu
  • Liquan Chen
  • Minsi Li
  • Mohammad Norouzi Banis
  • Qingyu Kong
  • Richeng Yu
  • Shuai Liu
  • Weihan Li
  • Xi Shen
  • Xuedong Bai
  • Xueliang Sun
  • Yurui Gao
  • Zepeng Liu
  • Zhaoxiang Wang

Organizations

  • Army Research Office
  • California State University
  • Chinese Academy of Sciences
  • Institute of Physics
  • National Natural Science Foundation of China
  • SOLEIL
  • University of Chinese Academy of Sciences
  • Western University

Tags

Fields of Study

  • Materials science

Readers

  • Battery Technology and Engineering
  • Quantum Chemistry
  • Systems Analysis and Design