High capacity spinel@ layered Li1. 5MnTiO4+ δ as thermally stable core-shell-driven cathode materials for lithium-ion batteries
- Authors
- Ngoc Hung Vu; Arunkumar, Paulraj; Im, Jong Chan; Im, Won Bin
- Issue Date
- May-2017
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- LiMnTiO4; Thermally stable cathode; Spinel framework ' ; Lithium-ion battery
- Citation
- JOURNAL OF ALLOYS AND COMPOUNDS, v.704, pp.459 - 468
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF ALLOYS AND COMPOUNDS
- Volume
- 704
- Start Page
- 459
- End Page
- 468
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/20321
- DOI
- 10.1016/j.jallcom.2017.02.127
- ISSN
- 0925-8388
- Abstract
- The recently developed composite cathode can solve the disadvantages of single-component Lithium-ion batteries such as low capacity, low rate performance, and poor cycling stability. Spinel-layered Li1.5MnTiO4+δ composites synthesized by a solid-state reaction showed high capacity and excellent cycling stability at room temperature. However, this material showed very poor cycling stability at 50 °C. A novel approach was used to synthesize spinel@layered composites, with the thermally stable layered component located in the outer part, and the high-capacity spinel located in the inner part of the composite particles. The effects of annealing temperature on electrochemical performance of cathodes were studied at both room temperature and 50 °C. The optimized sample, which was annealed at 700 °C, showed excellent thermal stability at 50 °C with 92% capacity retention after 100 cycles at 1C, compared to the value of 87% shown by the solid-state sample. At room temperature, the optimized cathode exhibited enhanced capacities of 209 and 157 mAh g⁻¹ at C/5 and 1C, respectively. Moreover, the optimized sample showed improved performance at different C-rates compare to the solid-state sample.
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