Synthesis of single-crystal magnesium-doped spinel lithium manganate and its applications for lithium-ion batteries

Hu Xu, Yongxiang Chen, Yunjiao Li, Long Kong, Huacheng Li, Chunrui Xu, Qianye Su, Miaomiao Ren

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Single-crystal magnesium-doped spinel lithium manganate cathode materials are prepared by the hydrothermal method followed by the heat treatment. XRD patterns reveal that Mg2+ions have already diffused into the Li1.088Mn1.912O4 crystal structure and not affect the Fd3m space group. SEM images demonstrate that the magnesium-doped spinel lithium manganates show uniform polyhedral single crystals with 2–4 μm. Electrochemical performance demonstrates that the optimized composition of Li1.088Mg0.070Mn1.842O4 electrode exhibits the best electrochemical properties. It delivers 92.0 mAh g−1 at 8C rates and corresponds to 90.8% capacity retention (vs. 1C), far higher than those of the pristine electrode (70.4 mAh g−1 and 69.2%). In addition, the Li1.088Mg0.070Mn1.842O4 electrode also shows 95.5% capacity retention after 100 cycles at 1C, while the pristine electrode only shows 91.0% capacity retention. The excellent electrochemical performances of Li1.088Mg0.070Mn1.842O4 electrode are ascribed to the suppressed polarization, more stable crystal structure, and better kinetic characteristics.

Original languageEnglish
Pages (from-to)3735-3742
Number of pages8
JournalJournal of Solid State Electrochemistry
Volume22
Issue number12
DOIs
StatePublished - 1 Dec 2018
Externally publishedYes

Keywords

  • Hydrothermal method
  • Lithium-ion batteries
  • Mg doping
  • Spinel lithium manganese oxides

Fingerprint

Dive into the research topics of 'Synthesis of single-crystal magnesium-doped spinel lithium manganate and its applications for lithium-ion batteries'. Together they form a unique fingerprint.

Cite this