| 锂离子电池负极材料Li_4Ti_5O_(12)/C的制备与表征 |
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| 引用本文： | 赵曦,田艳红,张学军,陈永.锂离子电池负极材料Li_4Ti_5O_(12)/C的制备与表征[J].化工学报,2015,66(5):1989-1995. |
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| 作者姓名： | 赵曦 田艳红 张学军 陈永 |
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| 作者单位： | 北京化工大学材料科学与工程学院, 北京 100029 |
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| 摘 要： | 针对Li4Ti5O12导电性和倍率性能差的缺陷,以PEG为碳源采用溶胶-凝胶法制备出电池负极材料Li4Ti5O12/C,考察不同分子量聚乙二醇PEG(400、600、1000)做碳源制备的Li4Ti5O12/C复合材料电化学性能的优劣,采用热重分析仪(TG)、X射线衍射仪(XRD)、扫描电镜(SEM)、透射电镜(TEM)、恒流充放电、倍率放电、交流阻抗(EIS)等方法对材料进行了结构表征和电化学性能测试。结果表明:以PEG1000为碳源时得到的Li4Ti5O12/C,0.1C下首次放电比容量为143.5 m A·h·g-1,2C的倍率下仍然保持了105 m A·h·g-1的比容量,容量保持率达到73.17%,并且此材料有最小的电阻,在大电流条件下有良好的电化学性能。
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| 关 键 词： | 电化学 纳米粒子 粉体 锂离子电池 Li4Ti5O12 PEG 溶胶-凝胶法 |
| 收稿时间： | 2014-08-05 |
| 修稿时间： | 2015-02-19 |
Preparation and characterization of Li4Ti5O12/C anode material for lithium ion batteries |
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| ZHAO Xi,TIAN Yanhong,ZHANG Xuejun,CHEN Yong.Preparation and characterization of Li4Ti5O12/C anode material for lithium ion batteries[J].Journal of Chemical Industry and Engineering(China),2015,66(5):1989-1995. |
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| Authors: | ZHAO Xi TIAN Yanhong ZHANG Xuejun CHEN Yong |
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| Affiliation: | School of Meterials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China |
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| Abstract: | In order to enhance electrical conductivity and rate capability of Li4Ti5O12, the Li4Ti5O12/C powder was prepared by the sol-gel method, using PEG as carbon source. The performance of Li4Ti5O12/C coated by three different molecular weight carbon sources: PEG (400, 600, and 1000), was investigated with TG, XRD, SEM, TEM, constant current charge-discharge, rate discharge and EIS. The material obtained by using PEG1000 as carbon source had the best electrochemical performance. Initial discharge capacity was 143.5 mA·h·g-1 at 0.1C rate, and discharge capacity remained 105 mA·h·g-1 at 2C rate, capacity retention ratio was 73.17%, in addition, it had the smallest resistance. |
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| Keywords: | electrochemistry nanoparticles powders lithium ion battery Li4Ti5O12 PEG sol-gel method |
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