Li4Ti5O12 Nanoparticles Embedded in a Mesoporous Carbon Matrix as a Superior Anode Material for High Rate Lithium Ion Batteries
Li4Ti5O12 Nanoparticles Embedded in a Mesoporous Carbon Matrix as a Superior Anode Material for High Rate Lithium Ion Batteries
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嵌入介孔碳基体中的 Li4Ti5O12 纳米颗粒作为高倍率锂离子电池的优质负极材料
DOI：
10.1002/aenm.201100720
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发表时间：
2012-06-01
影响因子：
27.8
通讯作者：
Cao, Guozhong
中科院分区：
文献类型：
--
作者：
Shen, Laifa;Zhang, Xiaogang;Cao, Guozhong
以多孔碳材料CMK-3为硬模板剂，采用纳米铸造法合成了介孔Li 4 Ti 5 O 12/C纳米复合材料。用Li 4 Ti 5 O 12前体浸渍改性的CMK-3模板，然后在N2下在750 ℃下热处理6小时。通过场发射扫描电子显微镜、透射电子显微镜、X射线衍射、拉曼光谱和氮吸附等温线证实了在微米级多孔碳泡沫中成功合成了高达几十纳米的Li 4 Ti 5 O 12纳米晶体，形成了高导电网络。然后将该复合材料作为锂离子电池的阳极材料进行评价。与本体Li 4 Ti 5 O 12相比，其表现出极大改善的电化学性能，并且表现出优异的倍率性能（在80 C下为73.4 mA h g-1）和显著增强的循环性能（在20 C的高倍率下1000次循环后仅5.6%的容量损失）。介孔Li 4 Ti 5 O 12/C纳米复合材料的储锂性能大大增强，这可能归因于互穿导电碳网络，有序的介孔结构，以及小的Li 4 Ti 5 O 12纳米晶体，增加了整个电极的离子和电子传导。
A mesoporous Li4Ti5O12/C nanocomposite is synthesized by a nanocasting technique using the porous carbon material CMK-3 as a hard template. Modified CMK-3 template is impregnated with Li4Ti5O12 precursor, followed by heat treatment at 750 degrees C for 6 h under N2. Li4Ti5O12 nanocrystals of up to several tens of nanometers are successfully synthesized in micrometer-sized porous carbon foam to form a highly conductive network, as confirmed by field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Raman spectroscopy, and nitrogen sorption isotherms. The composite is then evaluated as an anode material for lithium ion batteries. It exhibits greatly improved electrochemical performance compared with bulk Li4Ti5O12, and shows an excellent rate capability (73.4 mA h g-1 at 80 C) with significantly enhanced cycling performance (only 5.6% capacity loss after 1000 cycles at a high rate of 20 C). The greatly enhanced lithium storage properties of the mesoporous Li4Ti5O12/C nanocomposite may be attributed to the interpenetrating conductive carbon network, ordered mesoporous structure, and the small Li4Ti5O12 nanocrystallites that increase the ionic and electronic conduction throughout the electrode.