高等学校化学学报 ›› 2015, Vol. 36 ›› Issue (5): 981.doi: 10.7503/cjcu20140777

• 物理化学 • 上一篇    下一篇

N掺杂C包覆Li4Ti5O12锂离子电池负极材料的制备与性能

史楠楠, 姜雪, 张莹, 程魁, 叶克, 王贵领, 曹殿学()   

  1. 哈尔滨工程大学材料科学与化学工程学院, 哈尔滨 150001
  • 收稿日期:2014-08-27 出版日期:2015-05-10 发布日期:2015-04-20
  • 作者简介:联系人简介: 曹殿学, 男, 博士, 教授, 主要从事燃料电池、 锂离子电池及超级电容器电极材料研究. E-mail: caodianxue@hrbeu.edu.cn
  • 基金资助:
    黑龙江省博士后基金(批准号: LBH-Z13059)资助

Preparation and Performance of N-doped Carbon Coated Li4Ti5O12 as Anode Material for Lithium-ion Batteries

SHI Nannan, JIANG Xue, ZHANG Ying, CHENG Kui, YE Ke, WANG Guiling, CAO Dianxue*()   

  1. College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
  • Received:2014-08-27 Online:2015-05-10 Published:2015-04-20
  • Contact: CAO Dianxue E-mail:caodianxue@hrbeu.edu.cn
  • Supported by:
    † Supported by the Postdoctoral Fund of Heilongjiang Province, China(No.LBH-Z13059)

摘要:

以TiO2和Li2CO3分别作为钛源和锂源, 聚苯胺(PANI)作为碳源和氮源, 通过球磨辅助高温固相法合成N掺杂C包覆Li4Ti5O12. 通过X射线衍射仪(XRD)、 X射线光电子能谱仪(XPS)、 元素分析仪(EA)、 扫描电子显微镜(SEM)及透射电子显微镜(TEM)等对材料的结构和形貌进行了表征, 并将合成材料制成电极片组装成扣式电池, 测试其电化学性能. 结果显示, 钛源的处理对样品的性能有影响, 通过对TiO2预包覆合成的N掺杂C包覆Li4Ti5O12具有优异的电化学性能, 在碳、 氮源的包覆比例(PANI与Li4Ti5O12的质量比)为5%时效果最佳: 1 C放电时其比容量为157.6 mA·h/g, 20 C放电时其比容量仍可达到119.6 mA·h/g; 在10 C充放电循环100次后, 其比容量保持率为97.8%, 表明N掺杂C包覆Li4Ti5O12具有优异的倍率性能和循环稳定性.

关键词: N掺杂, C包覆, 聚苯胺, 钛酸锂, 负极材料

Abstract:

N-doped carbon coated Li4Ti5O12 samples were synthesized by a conventional high-temperature solid method with ball milled TiO2, Li2CO3 and polyaniline(PANI) as the titanium source, lithium source and carbon/nitrogen source, respectively. The structure and morphology of the samples were characterized by X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), elemental analysis(EA), scanning electron microscopy(SEM) and transmission electron microscopy(TEM). The electrochemical performance of the samples as the anode material for lithium-ion batteries was evaluated. The results indicate that the treatment of titanium source affect the electrochemical properties of samples. N-doped carbon coated Li4Ti5O12 obtained by pre-coating process of TiO2 showed the best electrochemical behaviors when the coating ratio of carbon/nitrogen source was 5%. The specific capacity of the electrode reached 157.6 mA·h/g at 1 C and retained to be 119.6 mA·h/g at a high current density of 20 C. It remained 97.8% of initial capacity after 100 cycles at 10 C.

Key words: N-doping, Carbon coating, Polyaniline, Lithium titanate, Anode material

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