物理化学学报 >> 2017, Vol. 33 >> Issue (12): 2517-2522.doi: 10.3866/PKU.WHXB201706162

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AlN-Fe纳米复合薄膜:一种新型锂离子电池负极材料

牛晓叶,杜小琴,王钦超,吴晓京,张昕,周永宁*()   

  • 收稿日期:2017-05-15 发布日期:2017-09-05
  • 通讯作者: 周永宁 E-mail:ynzhou@fudan.edu.cn
  • 基金资助:
    国家自然科学基金(51502039)

AlN-Fe Nanocomposite Thin Film:A New Anode Material for Lithium-Ion Batteries

Xiao-Ye NIU,Xiao-Qin DU,Qin-Chao WANG,Xiao-Jing WU,Xin ZHANG,Yong-Ning ZHOU*()   

  • Received:2017-05-15 Published:2017-09-05
  • Contact: Yong-Ning ZHOU E-mail:ynzhou@fudan.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(51502039)

摘要:

采用脉冲激光沉积技术(PLD)制备了不同比例的AlN-Fe纳米复合薄膜(AlN和Fe摩尔比为3:1;2:1;1:1;1:2),首次研究了其作为锂离子电池负极材料的电化学行为。发现当AlN和Fe的比例为2:1时,复合薄膜具有最佳的电化学性能。在500 mA·g-1电流密度下,AlN-Fe(2:1)经过100次循环充放电后容量仍能保持510 mAh·g-1。对其电化学反应机理研究发现,在放电过程中,AlN-Fe纳米复合薄膜中的AlN发生分解,AlN-Fe生成LiAl合金和Li3N。纳米Fe颗粒的引入有效提高AlN的电化学活性;在充电过程中,部分Li3N与Fe纳米颗粒反应生成了Fe3N,其余部分Li3N重新生成AlN。随后的充放电过程由Fe3N、AlN和Al三者与Li的可逆反应共同参与,保证了AlN-Fe纳米复合薄膜优异的电化学性能。该研究为设计开发新型锂离子电池电极材料提供了一种新的思路。

关键词: 锂离子电池, 负极材料, 氮化铝, 薄膜, 脉冲激光沉积

Abstract:

AlN-Fe nanocomposite thin films with different AlN-Fe ratio were prepared by pulsed laser deposition (PLD).They were investigated as new anode materials for lithium ion batteries for the first time.The AlN-Fe nanocomposite films with an AlN/Fe ratio of 2:1 show the best electrochemical performance.They exhibit a specific capacity of 510 mA·g-1 after 100 cycles at a rate of 500 mA·g-1.Further, the study of the electrochemical reaction mechanism of the AlN-Fe nanocomposite thin films with lithium reveals that AlN decomposes during the discharge process to form the LiAl alloy and Li3N.During recharge, a part of Li3N reacts with Fe to form Fe3N, and the rest reacts with Al to form AlN.In subsequent cycles, all of Fe3N, AlN, and Al react with Li reversibly, contributing to the reversible charge-discharge processes and to the superior electrochemical performance of AlN-Fe nanocomposite thin films.Thus, this study provides a new perspective to design advanced electrode materials for lithium-ion batteries.

Key words: Lithium-ion battery, Anode material, Aluminium nitride, Thin film, Pulsed laser Deposition

MSC2000: 

  • O646