期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 14, 页码 9162-9169出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b01644
关键词
lithium-ion batteries; anode; high power; spinel Li4Ti5O12; reduced graphene oxide
资金
- National Natural Science Foundation of China [51108455, 21203082, 51273087]
- Scientific Research Program Foundation of Liaoning Province Education Administration [L2015195]
- start-up funds of University at Buffalo
- National Science Foundation [CBET-1511528]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1511528] Funding Source: National Science Foundation
Spinel Li4Ti5O12 (LTO) and reduced graphene oxide (rGO) are attractive anode materials for lithium-ion batteries (LIBs) because of their unique electrochemical properties. Herein, we report a facile one-step hydrothermal method in preparation of a nanocomposite anode consisting of well-dispersed mesoporous LTO particles onto rGO. An important reaction step involves glucose as a novel linker agent and reducing agent during the synthesis. It was found to prevent the aggregation of LTO particles, and to yield mesoporous structures in nanocomposites. Moreover, GO is reduced to rGO by the hydroxyl groups on glucose during the hydrothermal process. When compared to previously reported LTO/graphene electrodes, the newly prepared LTO/rGO nanocomposite has mesoporous characteristics and provides additional surface lithium storage capability, superior to traditional LTO-based materials for LIBs. These unique properties lead to markedly improved electrochemical performance. In particular, the nanocomposite anode delivers an ultrahigh reversible capacity of 193 mA h g(-1) at 0.5 C and superior rate performance capable of retaining a capacity of 168 mA h g(-1) at 30 C between 1.0 and 2.5 V. Therefore, the newly prepared mesoporous LTO/rGO nanocomposite with increased surface lithium storage capability will provide a new opportunity to develop high-power anode materials for LIBs.
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