Crystallized lithium titanate nanosheets prepared via spark plasma sintering for ultra- high rate lithium ion batteries
Crystallized lithium titanate nanosheets prepared via spark plasma sintering for ultra- high rate lithium ion batteries
复制标题
放电等离子体烧结制备结晶钛酸锂纳米片用于超高倍率锂离子电池
DOI：
10.1039/c8ta10680k
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发表时间：
2019-01-14
影响因子：
11.9
通讯作者：
Li, Baohua
中科院分区：
文献类型：
--
作者：
Li, Junqin;Zhang, Tengfei;Li, Baohua
本文表明，利用水热反应合成的纳米片前驱体，通过放电等离子体烧结（SPS）方法在500摄氏度下仅用5分钟就成功制备了钛酸锂（LTO）纳米片材料。在 SPS 过程中，脉冲电场在更低的温度和更短的时间内诱导前驱体发生相变。此外，LTO前驱体的薄层形貌在SPS处理后可以很好地保持，在传统的固态煅烧过程中已转变为纳米颗粒。 SPS制备的结晶LTO纳米片在8 A g(-1) (45.7C)和10 A g(-1) (57.1C)的高电流密度下分别具有151.2 mA h g(-1)和147.2 mA h g(-1)的高比容量。此外，LTO纳米片在1 A g(-1)和2 A g(-1)下循环1000次后，容量保持率分别为73.9%和75.6%。
This paper shows that a lithium titanate (LTO) nanosheet material is successfully prepared by the spark plasma sintering (SPS) method at 500 degrees C within only 5 minutes, using its nanosheet precursor synthesized by hydrothermal reaction. The pulsed electric field induces the phase transition of the precursor at much lower temperature and in a much shorter time during the SPS process. Moreover, the thin layer morphology of the LTO precursor can be well maintained after SPS treatment, which has been changed into nanoparticles during the conventional solid state calcination. The crystalline LTO nanosheets prepared by SPS deliver high specific capacities of 151.2 mA h g(-1) and 147.2 mA h g(-1) at high current densities of 8 A g(-1) (45.7C) and 10 A g(-1) (57.1C), respectively. Moreover, the LTO nanosheets display stable capacity retentions of 73.9% and 75.6% after 1000 cycles at 1 A g(-1) and 2 A g(-1), respectively.