Nanoparticle-assembled LiMn 2 O 4 hollow microspheres as high-performance lithium-ion battery cathode
| Autor: | Shunhua Xiao, Jinping Liu, Yanfang Mao |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Diffusion Analytical chemistry chemistry.chemical_element Nanoparticle 02 engineering and technology engineering.material 010402 general chemistry Electrochemistry 01 natural sciences Lithium-ion battery law.invention Magazine law General Materials Science Mechanical Engineering Spinel 021001 nanoscience & nanotechnology Condensed Matter Physics Cathode 0104 chemical sciences chemistry Chemical engineering Mechanics of Materials engineering Lithium 0210 nano-technology |
| Zdroj: | Materials Research Bulletin. 96:437-442 |
| ISSN: | 0025-5408 |
| DOI: | 10.1016/j.materresbull.2017.03.005 |
| Popis: | Spinel LiMn 2 O 4 is an attractive cathode material for rechargeable lithium-ion batteries. However, its cycling and rate performance need further improvement. Herein, we present a novel LiMn 2 O 4 hollow microsphere cathode fabricated via a simple solid-state reaction utilizing MnO 2 hollow microspheres and LiOH H 2 O as the reactants. Interestingly, the as-prepared LiMn 2 O 4 hollow microspheres are assembled by LiMn 2 O 4 octahedral nanoparticles with exposed {111} planes, exhibiting abundant void spaces for the stress buffering and larger diffusion coefficient (1.570 × 10 −7 cm 2 s −1 ) for fast lithium ion transfer as compared to the simply aggregated LiMn 2 O 4 nanoparticles. As a result, the LiMn 2 O 4 hollow microspheres exhibit much improved cycling stability and deliver a specific discharge capacity of 86.3 mAh g −1 at a high rate of 10C, higher than that of the aggregated LiMn 2 O 4 (73.9 mAh g −1 ). Our work suggests that the electrochemical performance of LiMn 2 O 4 cathode can be manipulated by the design of unique hollow sphere structure. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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