| Nanosized Li(4)Ti(5)O(12)/graphene hybrid materials with low polarization for high rate lithium ion batteries |
| Y. Shi; L. Wen; F. Li; H. M. Cheng
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| 2011
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| 发表期刊 | Journal of Power Sources
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| ISSN | 0378-7753
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| 卷号 | 196期号:20页码:8610-8617 |
| 摘要 | We report a simple strategy to prepare a hybrid of lithium titanate (Li(4)Ti(5)O(12), LTO) nanoparticles well-dispersed on electrical conductive graphene nanosheets as an anode material for high rate lithium ion batteries. Lithium ion transport is facilitated by making pure phase Li(4)Ti(5)O(12) particles in a nanosize to shorten the ion transport path. Electron transport is improved by forming a conductive graphene network throughout the insulating Li(4)Ti(5)O(12) nanoparticles. The charge transfer resistance at the particle/electrolyte interface is reduced from 53.9 Omega to 36.2 Omega and the peak currents measured by a cyclic voltammogram are increased at each scan rate. The difference between charge and discharge plateau potentials becomes much smaller at all discharge rates because of lowered polarization. With 5 wt.% graphene, the hybrid materials deliver a specific capacity of 122 mAh g(-1) even at a very high charge/discharge rate of 30C and exhibit an excellent cycling performance, with the first discharge capacity of 132.2 mAh g(-1) and less than 6% discharge capacity loss over 300 cycles at 20C. The outstanding electrochemical performance and acceptable initial columbic efficiency of the nano-Li(4)Ti(5)O(12)/graphene hybrid with 5 wt.% graphene make it a promising anode material for high rate lithium ion batteries. (C) 2011 Elsevier B.V. All rights reserved. |
| 部门归属 | [shi, ying; wen, lei; li, feng; cheng, hui-ming] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china.;li, f (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china;fli@imr.ac.cn
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| 关键词 | Lithium Titanate
Graphene
High Rate Anode Materials
Lithium-ion
Batteries
Anode Material
Electrochemical Performance
Nanocrystalline Li4ti5o12
Reversible Capacity
Cyclic Performance
Spinel Li4ti5o12
Rate
Capability
Graphene
Composite
Insertion
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| URL | 查看原文
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| 文献类型 | 期刊论文
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| 条目标识符 | http://ir.imr.ac.cn/handle/321006/30662
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| 专题 | 中国科学院金属研究所
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推荐引用方式
GB/T 7714 |
Y. Shi,L. Wen,F. Li,et al. Nanosized Li(4)Ti(5)O(12)/graphene hybrid materials with low polarization for high rate lithium ion batteries[J]. Journal of Power Sources,2011,196(20):8610-8617.
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| APA |
Y. Shi,L. Wen,F. Li,&H. M. Cheng.(2011).Nanosized Li(4)Ti(5)O(12)/graphene hybrid materials with low polarization for high rate lithium ion batteries.Journal of Power Sources,196(20),8610-8617.
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| MLA |
Y. Shi,et al."Nanosized Li(4)Ti(5)O(12)/graphene hybrid materials with low polarization for high rate lithium ion batteries".Journal of Power Sources 196.20(2011):8610-8617.
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