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中南大学学报(自然科学版)

Journal of Central South University

第43卷    第5期    总第213期    2012年5月

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文章编号:1672-7207(2012)05-1634-04
以竹纤维为模板制备微米管状Li4Ti5O12负极材料
邵丹1,何嘉荣1,刘惠平1,卢子华1,董先明1,禹筱元1, 2

(1. 华南农业大学 理学院 生物材料研究所,广东 广州,510642;
2. 中国科学院 可再生能源与天然气水合物重点实验室,广东 广州,510640
)

摘 要: 以竹纤维为模板,Ti(OC4H9)4和Li(Ac)·2H2O为原料,用模板法制备锂离子电池微米管状Li4Ti5O12负极材料。采用XRD,SEM,BET,充放电实验和交流阻抗等对合成材料的结构、形貌和电化学性能进行表征。研究结果表明:制备的微米管状Li4Ti5O12负极材料由尖晶石型纳米Li4Ti5O12颗粒构成,具有较大的比表面积,该材料具有良好的电化学性能,在0.5~3.0 V,0.1C倍率下的首次放电比容量为178 mA∙h/g,充放电循环100次后放电比容量仍保留162 mA∙h/g,且倍率性能优异。

 

关键字: 锂离子电池;负极材料;模板法;微米管状Li4Ti5O12;竹纤维

Synthesis of microtubes Li4Ti5O12 anode material by bamboo fiber template
SHAO Dan1, HE Jia-rong1, LIU Hui-ping1, LU Zi-hua1, DONG Xian-ming1, YU Xiao-yuan1, 2

1. Institute of Biomaterial, College of Science, South China Agricultural University, Guangzhou 510642, China;
2. Key Laboratory of Renewable Energy and Gas Hydrate, Chinese Academy of Sciences, Guangzhou 510640, China

Abstract:Microtube Li4Ti5O12 anode materials for lithium-ion batteries were synthesized using bamboo fiber as template, and Ti(OC4H9)4 and Li(Ac)·2H2O as raw materials. The structure, morphology and electrochemical properties of Li4Ti5O12 were characterized by X-ray diffraction (XRD), scanning electronic morphology (SEM), Brunauer-Emmett- Teller method (BET), galvanostatic charge-discharge tests and electrochemical impedance spectroscopy (EIS) measurements. The results show that the Li4Ti5O12 microtubes are composed of spinel Li4Ti5O12 nano-particles, which has a high special surface area resulting in improved electrochemistry performances. The electrochemical test results show that the spinel Li4Ti5O12 microtube delivers the initial discharge capacity of 178 mA∙h/g at 0.1 C current rate in the voltage rang of 0.5-3.0 V, and its discharge capacity retains 162 mA∙h/g after 100 cycles. The spinel Li4Ti5O12 material has an excellent rate performance.

 

Key words: lithium-ion battery; anode material; template method; Li4Ti5O12 microtubes; bamboo fiber

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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