Facile solid-state synthesis of Li2MnSiO4/C nanocomposite as a superior cathode with a long cycle life
Facile solid-state synthesis of Li2MnSiO4/C nanocomposite as a superior cathode with a long cycle life
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DOI：
10.1016/j.jpowsour.2012.12.071
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发表时间：
2013-06
影响因子：
9.2
通讯作者：
Jing Liu;Huayun Xu;Xiaolei Jiang;Jian Yang;Y. Qian
中科院分区：
文献类型：
--
作者：
Jing Liu;Huayun Xu;Xiaolei Jiang;Jian Yang;Y. Qian
以柠檬酸为碳源，在650 °C的较低温度下，通过简单的固相反应成功合成了Li 2 MnSiO 4/C纳米复合材料。在尺寸为20-50 nm的高度结晶的Li 2 MnSiO 4纳米颗粒上包覆有厚度为2-5 nm的均匀碳层。在0.05 C的倍率下，Li 2 MnSiO 4/C纳米复合材料在室温下第一次循环的放电比容量高达268 mAh g-1，140次循环后的可逆容量约为136 mAh g-1。同时，Li 2 MnSiO 4/C纳米复合材料实现了改善的倍率性能。这些优异的上级电化学性能可归因于纳米级的颗粒尺寸和增强的电子导电性。
The Li2MnSiO4/C nanocomposite has been successfully synthesized at a relatively low temperature of 650 °C by a facile solid-state reaction using citric acid as the carbon source. The highly crystalline Li2MnSiO4nanoparticles in the size of 20–50 nm are coated by a uniform carbon layer in a thickness of 2–5 nm. At a rate of 0.05 C, the Li2MnSiO4/C nanocomposite exhibits a discharge specific capacity as high as 268 mAh g−1for the first cycle and a reversible capacity of about 136 mAh g−1after 140 cycles at room temperature. Meanwhile, an improved rate performance is achieved by the Li2MnSiO4/C nanocomposite. These superior electrochemical properties could be attributed to the nanoscale particle size and the enhanced electronic conductivity.