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畢業(yè)設(shè)計(jì)說明書中文摘要

   

本文講述了鋰離子電池（LIBs）電極材料的研究發(fā)展情況。制備綠色環(huán)保且具有高效性能的鋰離子電池，是目前以及未來的研究重點(diǎn)。本文利用金屬錫高理論比容量的特點(diǎn)，與廢棄資源木質(zhì)素作為碳源復(fù)合，制備生物質(zhì)衍生碳/錫的復(fù)合材料，期望獲得性能優(yōu)異的鋰離子電池負(fù)極材料。在考察不同錫源加入量，不同水浴溫度和煅燒溫度作為三組變量下，發(fā)現(xiàn)加入0.8mmol氯化亞錫，在50℃下水浴、700℃氮?dú)夥諊褵轮苽涞奶?錫復(fù)合材料綜合性能較好，首次放電容量為795.3 mAh/g，遠(yuǎn)高于石墨材料，第二次放電容量為437.5 mAh/g，經(jīng)歷50次循環(huán)后，放電容量為135.9 mAh/g。這些顯著的電化學(xué)行為歸結(jié)于錫粒很好地嵌入并且均勻分布在多孔碳結(jié)構(gòu)上。

關(guān)鍵詞  鋰離子電池  炭錫復(fù)合物  負(fù)極  木質(zhì)素

畢業(yè)設(shè)計(jì)說明書外文摘要

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  鋰離子電池工作原理 1

1.2  鋰離子電池電極材料研究進(jìn)展與展望 2

1.3  本課題的研究意義 4

2  實(shí)驗(yàn)部分 6

2.1  原料與試劑 6

2.2  實(shí)驗(yàn)儀器 6

2.3  實(shí)驗(yàn)方案 7

2.4  實(shí)驗(yàn)材料的制備 7

2.5  樣品材料的結(jié)構(gòu)表征 8

2.6  實(shí)驗(yàn)樣品電池的制備 8

2.7  實(shí)驗(yàn)樣品電池的電化學(xué)性能測(cè)試 9

3  實(shí)驗(yàn)結(jié)果分析 10

3.1  炭/錫復(fù)合材料的結(jié)構(gòu)表征 10

3.2  不同錫含量和不同條件下得到的炭/錫復(fù)合材料的電化學(xué)性能 12

結(jié)  論 22

致  謝 23

參 考 文 獻(xiàn) 24