碳錫復合多孔材料的制備及儲鋰性能

材料科學論文編號:CL011  論文字數:12063,頁數:29

碳/錫復合多孔材料的制備及儲鋰性能
目 錄
第一章 緒論 1
1.1課題背景及目的 1
1.2介孔材料概述 1
1.3介孔材料的制備 2
 1.3.1.介孔硅的制備機理………………………………………………………………........2
1.3.1.1液晶模板機理 …………………………………………………………………2
1.3.1.2硅酸鹽棒狀自組裝機理 …………………………………………………..........3
 1.3.2. 介孔材料SBA-15的改性…………………………………………………….….......4
1.3.2.1 Al對介孔分子篩SBA-15的改性 ………………………………………………4
1.3.2.2 Ti對介孔材料SBA-15的改性 ………………………..………………..........5
 1.3.3介孔碳的制備的方法……………………………………………………………..….5
 1.3.3.1 CMK- 1……………………………………………………………………………6
 1.3.3.2 CMK- 3……………………………………………………………………………6
 1.3.3.3 CMK- 5……………………………………………………………………………7
1.4鋰離子電池負極材料的研究 8
1.5本項目研究思路 10
第二章 實驗 11
2.1實驗儀器及設備 11
2.2實驗原料 11
2.3實驗步驟 12
 a.介孔SBA-15制備 12
 b. Al對介孔SBA-15的改性 12
 c.介孔碳的制備 13
 d.介孔碳中錫的組裝 14
第三章 結果與分析 16
3.1介孔二氧化硅 16
3.2介孔碳 18
 3.3介孔炭中錫的組裝后的結構分析 19
 3.4介孔炭中錫的組裝后電學性能分析 21
 3.5結論 22
 致謝 23
參考文獻 24

摘  要
 目前商品化的鋰離子電池負極材料主要是石墨化碳材料，其理論容量為372mAh/ g，因此開發新型負極材料已成為研究的熱點。金屬錫的理論比容量為990mAh/ g，且其操作電位高，不存在共嵌入的問題，但由于錫在嵌鋰后自身體積膨脹較大，鋰的反復脫嵌會導致錫的逐漸粉化，造成與集流體的電接觸變差，循環壽命縮短。為了利用錫金屬的優點，同時解決其存在的不足，將錫與碳復合并實現制備材料的多孔化有望得到高儲鋰性能的新型鋰離子電池負極材料。
 本文以P123為模板劑，在酸性條件下，合成SBA-15介孔材料，并利用Al對其改性。以糠醇為碳前驅體，通過浸漬方法，將其引入介孔氧化硅的孔道中，再利用SBA-15介孔材料為模板，高溫炭化及炭熱還原技術，去掉硬模板劑得到介孔碳材料。通過組裝錫，制備介孔碳孔道內組裝錫的新型復合多孔鋰離子電池負極材料。并對其進行儲鋰性能研究。

關鍵詞：介孔材料，碳/錫復合，鋰離子電池，負極材料
 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