生物质衍生碳锡复合材料的制备及其电性能研究.doc

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毕业设计说明书中文摘要

   

本文讲述了锂离子电池（LIBs）电极材料的研究发展情况。制备绿色环保且具有高效性能的锂离子电池，是目前以及未来的研究重点。本文利用金属锡高理论比容量的特点，与废弃资源木质素作为碳源复合，制备生物质衍生碳/锡的复合材料，期望获得性能优异的锂离子电池负极材料。在考察不同锡源加入量，不同水浴温度和煅烧温度作为三组变量下，发现加入0.8mmol氯化亚锡，在50℃下水浴、700℃氮气氛围煅烧下制备的炭/锡复合材料综合性能较好，首次放电容量为795.3 mAh/g，远高于石墨材料，第二次放电容量为437.5 mAh/g，经历50次循环后，放电容量为135.9 mAh/g。这些显著的电化学行为归结于锡粒很好地嵌入并且均匀分布在多孔碳结构上。

关键词  锂离子电池  炭锡复合物  负极  木质素

毕业设计说明书外文摘要

Title the Research on the Preparation and Electrical Performance of Biomass  Derivative C/Sn Composite 

Abstract

In this article describes the development of electrode materials of the lithium-ion batteries (LIBs). It is current and future research priorities to obtain the green and high performance of the lithium-ion batteries. In this paper, we composited a metal tin with high theoretical specific capacity and waste resources-lignin as a carbon resource to acquire high performance lithium-ion battery cathode material. After studying the various experimental conditions, we found that the prepared carbon/tin composites had the best performance under the condition of  adding 0.8mmol SnCl2.2H2O, keeping in water bath at 50 ℃ and carbonizing at 700 ℃ in a nitrogen atmosphere, and it showed a capacity of 795.3 mAh/g at the first the discharge, which is far higher than that of carbon material. Besides, the second discharge capacity was 437.5 mAh/g, and the discharge capacity was 135.9 mAh/g after 50 cycles. These remarkable electrochemical performances were attributed to the good and uniform distribution of tin particles embedded in the porous carbon structure.

Keyword   lithium-ion batteries (LIBs)  charcoal/tin composite  cathode  lignin

 

目   次

1  前言 1

1.1  锂离子电池工作原理 1

1.2  锂离子电池电极材料研究进展与展望 2

1.3  本课题的研究意义 4

2  实验部分 6

2.1  原料与试剂 6

2.2  实验仪器 6

2.3  实验方案 7

2.4  实验材料的制备 7

2.5  样品材料的结构表征 8

2.6  实验样品电池的制备 8

2.7  实验样品电池的电化学性能测试 9

3  实验结果分析 10

3.1  炭/锡复合材料的结构表征 10

3.2  不同锡含量和不同条件下得到的炭/锡复合材料的电化学性能 12

结  论 22

致  谢 23

参 考 文 献 24