High dispersion of TiO2 nanocrystals within porous carbon improves lithium storage capacity and can be applied batteries to LiNi0.5Mn1.5O4
- Authors
- Ming, Hai; Ming, Jun; Oh, Seung-Min; Lee, Eung-Ju; Huang, Hui; Zhou, Qun; Zheng, Junwei; Sun, Yang Kook
- Issue Date
- Sep-2014
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- JOURNAL OF MATERIALS CHEMISTRY A, v.2, no.44, pp.18938 - 18945
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MATERIALS CHEMISTRY A
- Volume
- 2
- Number
- 44
- Start Page
- 18938
- End Page
- 18945
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/25782
- DOI
- 10.1039/c4ta03557g
- ISSN
- 2050-7488
- Abstract
- A new and simple strategy was developed to effectively disperse titanium dioxide (TiO2) nanocrystals into porous carbon (PC), and a series of hierarchical PC-TiO2 composites with different architectures were synthesized. By varying the amount of TiO2, from 30 wt% to 64 wt%, the lithium storage capacity of PC-TiO2 could be controllably varied from 546 mA h g(-1) to 446 mA h g(-1) under a current density of 50 mA g(-1). Also, very stable cycling performances and rate capabilities could be obtained at the rates of 50 mA g(-1) to 1600 mA g(-1). By further increasing the content of TiO2 to 93%, another new composite of TiO2-C was also prepared and it demonstrated a storage capacity of 352 mA h g(-1) at 50 mA g(-1), which is much higher than that for most reported TiO2 materials. Based on these results, new full cells with a LiNi0.5Mn1.5O4 cathode, such as PC-TiO2/LiNi0.5Mn1.5O4, were successfully assembled and investigated. This full cell not only delivered a high energy density of 413 W h kg(-1) but also showed a good rate capability and an energy retention of 90.5% over 100 cycles.
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