Nanosized silicon-based composite derived by in situ mechanochemical reduction for lithium ion batteries

Nanosized silicon-based composite derived by in situ mechanochemical reduction for lithium ion batteries
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原位机械化学还原制备纳米硅基复合材料用于锂离子电池

DOI:
10.1016/j.jpowsour.2006.11.010
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发表时间:
2007-02
影响因子:
9.2
通讯作者:
Lin, Bin
Lin, Bin
中科院分区:
工程技术2区
文献类型:
--
作者:
Xu, Xiaoxiong;Yang, Xuelin;Wen, Zhaoyin;Huang, Shahua;Lin, Bin

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采用高能机械球磨(HEMM)法制备了由纳米硅、Li4SiO4等富锂组分组成的复合材料。金属锂与SiO的反应球磨导致锂、硅的氧化和SiO的还原。用X射线衍射仪(XRD)和高分辨电子显微镜(HRTEM)对复合材料的物相进行了分析。此外,循环伏安法(CV),以及恒流放电/充电测试,被用来表征所得材料的电化学性质。与纯SiO和纯硅负极材料相比,所制备的复合材料即使在高C倍率下也表现出更大的容量和优越的循环性能。
Composite consisting of nanosized silicon, Li4SiO4and other lithium-rich components was synthesized using high energy mechanical milling (HEMM) method. The reactive milling of SiO with lithium metal resulted in the oxidation of lithium and silicon, and reduction of SiO. X-ray diffraction (XRD) and high-resolution transmission electron microscope (HRTEM) were used to determine the phases present in the composite. In addition, cyclic voltammetry (CV), along with constant current discharge/charge tests, was used to characterize the electrochemical properties of the resultant material. Compared with pure SiO and pure silicon as anode materials, the as-prepared composite demonstrated larger capacity and superior cyclability even at high C-rate.
DOI: 10.1126/science.276.5317.1395
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