论文编号:CL011 论文字数:12063,页数:29
碳/锡复合多孔材料的制备及储锂性能
摘 要
目前商品化的锂离子电池负极材料主要是石墨化碳材料，其理论容量为372mAh/ g，因此开发新型负极材料已成为研究的热点。金属锡的理论比容量为990mAh/ g，且其操作电位高，不存在共嵌入的问题，但由于锡在嵌锂后自身体积膨胀较大，锂的反复脱嵌会导致锡的逐渐粉化，造成与集流体的电接触变差，循环寿命缩短。为了利用锡金属的优点，同时解决其存在的不足，将锡与碳复合并实现制备材料的多孔化有望得到高储锂性能的新型锂离子电池负极材料。
本文以P123为模板剂，在酸性条件下，合成SBA-15介孔材料，并利用Al对其改性。以糠醇为碳前驱体，通过浸渍方法，将其引入介孔氧化硅的孔道中，再利用SBA-15介孔材料为模板，高温炭化及炭热还原技术，去掉硬模板剂得到介孔碳材料。通过组装锡，制备介孔碳孔道内组装锡的新型复合多孔锂离子电池负极材料。并对其进行储锂性能研究。
关键词：介孔材料，碳/锡复合，锂离子电池，负极材料
Abstract
The current commercialization of lithium-ion batteries are mainly of carbon graphite materials, its capacity value 372mAh/g, so the new negative material has become the focus of the study. Metal tin of theory than the capacity of up to 990mAh/g, and whose action potential high, total embedded does not exist, but since the lithium is itself a large volume expansion, lithium’s repeated removal of ingrown causes of Tin, lead and gradually powder collector of electrical contact variation, shorten the life cycle. In order to leverage the advantages of tin metal, while addressing the lack of Tin and carbon composite and realization of the porous material preparation is expected to be high performance lithium-type lithium-ion batteries.
This article to P123 as template, under acidic conditions, SBA-15 mesoporous materials synthesis, and leverage it modified Al. With Furfuryl alcohol and TMB (three toluene) as carbon precursors, by immersion method, it is introduced into mesoporous silica channel, then use SBA-15 mesoporous materials as a template, the high temperature carbonization and carbon reduction techniques, get mesoporous carbon materials. By assembling Tin, Tin and mesoporous carbon reasonable, the combination of synthetic want anode material. At the same time on the samples lithium performance study.
Key words: Mesoporous materials, C / Sn composite, Lithium ion battery, Anode materials
目 录
第一章 绪论1
1.1课题背景及目的1
1.2介孔材料概述1
1.3介孔材料的制备2
1.3.1.介孔硅的制备机理………………………………………………………………........2
1.3.1.1液晶模板机理…………………………………………………………………2
1.3.1.2硅酸盐棒状自组装机理…………………………………………………..........3
1.3.2. 介孔材料SBA-15的改性…………………………………………………….….......4
1.3.2.1 Al对介孔分子筛SBA-15的改性………………………………………………4
1.3.2.2 Ti对介孔材料SBA-15的改性………………………..………………..........5
1.3.3介孔碳的制备的方法……………………………………………………………..….5
1.3.3.1 CMK- 1……………………………………………………………………………6
1.3.3.2 CMK- 3……………………………………………………………………………6
1.3.3.3 CMK- 5……………………………………………………………………………7
1.4锂离子电池负极材料的研究8
1.5本项目研究思路10
第二章 实验11
2.1实验仪器及设备11
2.2实验原料11
2.3实验步骤12
a.介孔SBA-15制备12
b. Al对介孔SBA-15的改性12
c.介孔碳的制备13
d.介孔碳中锡的组装14
第三章 结果与分析16
3.1介孔二氧化硅16
3.2介孔碳18
3.3介孔炭中锡的组装后的结构分析19
3.4介孔炭中锡的组装后电学性能分析21
3.5结论22
致谢 23
参考文献24
碳锡复合多孔材料的制备及储锂性能......