Solid-state synthesis of uniform Li2MnSiO4/C/graphene composites and their performance in lithium-ion batteries

Solid-state synthesis of uniform Li2MnSiO4/C/graphene composites and their performance in lithium-ion batteries
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均匀Li2MnSiO4/C/石墨烯复合材料的固态合成及其在锂离子电池中的性能

DOI:
10.1016/j.jpowsour.2013.07.079
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发表时间:
2014-01
影响因子:
9.2
通讯作者:
Qian Yitai
Qian Yitai
中科院分区:
工程技术2区
文献类型:
--
作者:
Wang Linlin;Wei Denghu;Liang Qianwen;Qian Yitai

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以球形sio2为前驱体,采用聚乙二醇-600 (PEG-600)辅助固相反应,以葡萄糖、醋酸纤维素和氧化石墨烯为混合碳源进行热处理,制备了均匀的纳米球形Li2MnSiO4/C/石墨烯复合材料。透射电子显微镜(TEM)图像显示,尺寸为50 nm的li2mnsio4纳米球嵌入在三维(3D)巢状碳网络中。电化学测试表明,复合材料在0.05℃下首次放电容量为215.3 mAh g−1,在40次循环后放电容量稳定在175 mAh g−1。三维碳网络和碳层(非晶碳和石墨烯)有利于提高电化学性能。
Uniform nanospherical Li2MnSiO4/C/graphene composites have been obtained by polyethylene glycol-600 (PEG-600) assisted solid-state reaction using spherical SiO2as precursor, and heat treatment with the mixed carbon sources (glucose, cellulose acetate and graphene oxide). The transmission electron microscope (TEM) images show that Li2MnSiO4nanospheres with size of 50 nm are embedded in the three-dimensional (3D) nest-like carbon network. Electrochemical measurements reveal that the composites exhibit first discharge capacity of 215.3 mAh g−1under 0.05 C, together with a stable discharge capacity of 175 mAh g−1after 40 cycles. The 3D carbon network and the carbon layer (amorphous carbon and graphene) are favorable for improving the electrochemical performance.
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发表时间: 2013-03
影响因子: 4.9
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