Synthesis of Li2MnSiO4/C nanocomposites for lithium battery cathode employing sucrose as carbon source
Synthesis of Li2MnSiO4/C nanocomposites for lithium battery cathode employing sucrose as carbon source
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DOI：
10.1016/j.electacta.2013.09.051
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发表时间：
2014-05
影响因子：
6.6
通讯作者：
B. Shao;I. Taniguchi
中科院分区：
文献类型：
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作者：
B. Shao;I. Taniguchi
以蔗糖为碳源，采用喷雾热分解和球磨结合退火的方法制备了Li 2 MnSiO 4/C纳米复合材料。研究了蔗糖溶液浓度对Li 2 MnSiO 4/C纳米复合材料物理和电化学性能的影响。X射线衍射分析表明，Li 2 MnSiO 4/C纳米复合材料的衍射峰属于Pmn 21空间群的正交晶系结构。场发射扫描电子显微镜和透射电子显微镜证实，最终从0.1 mol L− 1蔗糖溶液中获得的Li 2 MnSiO 4/C纳米复合材料是尺寸小于100 nm的Li 2 MnSiO 4初级颗粒的团聚体，并且在这些团聚体的表面上部分形成薄的碳层。制备了Li 2 MnSiO 4/C纳米复合电极，使用乙炔黑作为可充电锂电池的阴极，并使用Li进行电化学测量|EC：DMC = 1：1中的1 M LiPF 6|在室温和高温下的Li 2 MnSiO 4/C电池。Li 2 MnSiO 4/C纳米复合材料电极在0.05 C和1 C时的首次放电容量分别为184 mAh g− 1和115 mAh g− 1。此外，它在0.05 C和60 °C下的首次放电容量为225 mAh g− 1。
Li2MnSiO4/C nanocomposites were prepared by a combination of spray pyrolysis and ball milling followed by annealing, employing sucrose as the carbon source. The effect of the concentration of sucrose solution on the physical and electrochemical properties of Li2MnSiO4/C nanocomposites was investigated. X-ray diffraction analysis indicated that the peaks of the Li2MnSiO4/C nanocomposites were indexed to the orthorhombic structure of thePmn21space group. Field-emission scanning electron microscopy and transmission electron microscopy verified that the Li2MnSiO4/C nanocomposites finally obtained from 0.1 mol L−1sucrose solution were agglomerates of Li2MnSiO4primary particles less than 100 nm in size, and that there are thin carbon layers partially formed on the surface of these agglomerates. A Li2MnSiO4/C nanocomposite electrode with 5 wt.% acetylene black was used as a cathode for rechargeable lithium batteries, and electrochemical measurement was carried out using Li|1 M LiPF6in EC:DMC = 1:1| Li2MnSiO4/C cells at room and elevated temperatures. The Li2MnSiO4/C nanocomposite electrodes delivered first-discharge capacities of 184 mAh g−1at 0.05 C and 115 mAh g−1at 1 C. Moreover, it exhibited a first-discharge capacity of 225 mAh g−1at 0.05 C and 60 °C.