Abstract
By a facile LiNO3 flux method, lithium manganese oxide composites (xLi4Mn5O12· yLi 2MnO3) were synthesized using a hierarchical organization precursor of manganese dioxide. Li4Mn5O12 and Li2MnO3 have spinel and rocksalt structures, respectively. The lithiation and structural transformation from the precursor to the composites occurred topotactically from exterior toward interior in the precursor particle with the increase of reaction time, and the composites had core-shell spinel@rocksalt structures in addition to the original hierarchical core-shell organization. The electrochemical measurements at 50 °C after 50 cycles confirmed that a typical spinel@rocksalt cathode had higher capacity retention (87.1%) than that with the composition close to the stoichiometric spinel (64.6%), indicating the Li2MnO3 shell can improve cycling stability for the composite electrode at elevated temperature.
Original language | English |
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Pages (from-to) | 34-40 |
Number of pages | 7 |
Journal | Solid State Ionics |
Volume | 196 |
Issue number | 1 |
DOIs | |
Publication status | Published - Aug 11 2011 |
Externally published | Yes |
Keywords
- Cathode materials
- Charge/discharge
- Core-shell
- Lithium manganese oxides
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics