Ultra-long life core-shell structure Li4Ti5O12/C nanocomposite anode materials for lithium ion batteries

Ultra-long life core-shell structure Li4Ti5O12/C nanocomposite anode materials for lithium ion batteries
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锂离子电池超长寿命核壳结构Li4Ti5O12/C纳米复合负极材料

DOI:
10.1016/j.jallcom.2018.06.169
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发表时间:
2018-10
影响因子:
6.2
通讯作者:
Sun Juncai
Sun Juncai
中科院分区:
材料科学2区
文献类型:
--
作者:
Liu Kun;Cui Jinlong;Yin Jinpeng;Man Jianzhong;Cui Yongfu;Wen Zhongsheng;Sun Juncai

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采用水热法制备了Li 4 Ti 5 O 12/C纳米复合材料,并在700 °C下退火6 h。该方法以十六烷基三甲基溴化铵(CTAB)为结构导向剂合成了窄粒径分布的Li 4 Ti 5 O 12纳米粒子,并以CTAB为碳源提高了Li 4 Ti 5 O 12纳米粒子的电导率。所得的Li 4 Ti 5 O 12/C纳米复合材料具有核壳结构,并且由尺寸约为90 nm的不规则聚集的纳米颗粒组成。当用作锂离子电池的负极材料时,所得到的Li 4 Ti 5 O 12/C纳米复合材料显示出优异的放电容量,在0.5C下100次循环后为160.6mAh/g。在20 C下循环1000次后,放电容量仍保持在106.8mAh/g,每次循环容量损失仅为0.004%。
The Li4Ti5O12/C nanocomposite was prepared via a hydrothermal method following by annealing treatment at 700 °C for 6 h. In this method, cetyltrimethyl ammonium bromide (CTAB) was applied as structure directing agent to synthesize Li4Ti5O12nanoparticles with narrow size distribution and as a carbon source to enhance the electronic conductivity of Li4Ti5O12nanoparticles. The resulting Li4Ti5O12/C nanocomposite exhibits a core-shell structure and is consisted of irregular aggregated nanoparticles with a size of approximately 90 nm. When used as anode materials for lithium ion batteries, the obtained Li4Ti5O12/C nanocomposites display an excellent discharge capacity of 160.6 mAh/g at 0.5 C after 100 cycles. And even after 1000 cycles at 20 C, the discharge capacity could still maintain 106.8 mAh/g with a capacity loss of only 0.004% per cycle.
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