Novel spinel Li sub(5)Cr sub(9)Ti sub(4)O sub(24) anode: Its electrochemical property and lithium storage process

In this work, a novel lithium storage material Li sub(5)Cr sub(9)Ti sub(4)O sub(24) is reported as anode material for rechargeable lithium-ion batteries. We prepare Li sub(5)Cr sub(9)Ti sub(4)O sub(24) by two different routes, sol-gel method and solid state reaction. Li sub(5)Cr sub(9)Ti sub(4)O sub...

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Bibliographic Details
Published in:Electrochimica acta 2016-08, Vol.209, p.17-24
Main Authors: Yan, Lei, Yu, Haoxiang, Qian, Shangshu, Li, Peng, Lin, Xiaoting, Wu, Yaoyao, Long, Nengbing, Shui, Miao, Shu, Jie
Format: Article
Language:English
Subjects:
Anodes
Charge
Lithium
Lithium batteries
Nanocrystals
Rechargeable batteries
Sol gel process
Solid state
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Summary:In this work, a novel lithium storage material Li sub(5)Cr sub(9)Ti sub(4)O sub(24) is reported as anode material for rechargeable lithium-ion batteries. We prepare Li sub(5)Cr sub(9)Ti sub(4)O sub(24) by two different routes, sol-gel method and solid state reaction. Li sub(5)Cr sub(9)Ti sub(4)O sub(24) nanocrystalline can be achieved by sol-gel method, while solid state reaction delivers micro-sized product. Electrochemical results show that Li sub(5)Cr sub(9)Ti sub(4)O sub(24) nanocrystalline exhibits reduced charge transfer resistance, decreased redox polarization and improved lithium-ion diffusion coefficient compared with micro-sized product. As a result, Li sub(5)Cr sub(9)Ti sub(4)O sub(24) nanocrystalline shows excellent lithium storage capability with 100% capacity retention after 200 cycles. Cycled at 600 mA g super(-1), it still can deliver a charge specific capacity of 110.3 mAh g super(-1). In contrast, micro-sized Li sub(5)Cr sub(9)Ti sub(4)O sub(24) only reveals the reversible capacity of 66.8 mAh g super(-1) at the same current density. In addition, Li sub(5)Cr sub(9)Ti sub(4)O sub(24) nanocrystalline also shows outstanding structural stability for repeated lithium storage. In-situ structural observation reveals that the entire volume expansion of Li sub(5)Cr sub(9)Ti sub(4)O sub(24) is only 0.62% during the charge/discharge process, which is similar with the zero-strain Li sub(4)Ti sub(5)O sub(12). Therefore, Li sub(5)Cr sub(9)Ti sub(4)O sub(24) nanocrystalline can be used as high performance anode material for lithium-ion batteries.
ISSN:0013-4686
DOI:10.1016/j.electacta.2016.05.040