Journal
SMALL METHODS
Volume 3, Issue 12, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smtd.201900350
Keywords
heterostructures; lithium-ion batteries; lithium-rich oxides; nanofibers; spinel
Funding
- MOST [2016YFA0202503]
- NSFC [21835004]
- MOE [B12015]
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Lithium-rich layered oxides are among the most promising cathode candidates to build high-energy-density rechargeable Li-ion batteries but suffer from capacity/voltage fade, low reversibility, and poor rate capability. Herein, the synthesis and electrochemical application of heterostructured spinel/layered oxide (Li1.15Ni0.20Mn0.87O2) nanofibers as superior cathode materials are reported. The synergistic effect of 1D nanostructure and spinel/layer heterostructure enhances charge transfer, lithium diffusivity, and structural stability, resulting in improved initial Coulombic efficiency (approximate to 100%), rate performance (150 mAh g(-1) at 5C), and cyclability (258 mAh g(-1) after 70 cycles). In situ X-ray diffraction and Raman combined with first-principle calculations reveal that the spinel stabilizes the layered Li-rich Mn-based oxide structure via maintaining oxygen vacancy and suppressing the structural variation and oxygen overoxidation.
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