- 學位論文
鋰離子電池硬碳負極材料製備與特性分析
Synthesis and characterization of hard carbon for anode materials of lithium ion batteries
摘要
以酚醛樹脂及高粱殘渣為原料，分別在氮氣氣氛下，經由700oC 至1000oC的溫度碳化1小時。利用元素分析儀、X光繞射儀、掃描式電子顯微鏡、拉曼光譜分析儀等儀器，對碳化後所得到的粉末樣品進行物理特性分析，並測試其充放電之電化學特性。X-Ray結果顯示，酚醛樹脂及高粱渣皆為典型的硬碳原料。在X-Ray和元素分析的結果中，可以觀察到少量矽和氧化矽存在於高梁渣製成之碳材中。在電化學特性方面結果顯示，由高梁渣製得之樣品中，以經700oC碳化後的樣品具有最高的初充電電容量，但也具有最大的初始不可逆電容量以及最明顯的電量衰退現象。在酚醛樹脂碳化後的樣品裡，700oC的熱處理溫度同樣也有最高的初充電電容量273 mAh/g。酚醛樹脂和高粱殘渣在高於900oC的碳化溫度下製得之樣品沒有循環充放電衰退現象，但第一圈之不可逆電容量仍然偏高。
並列摘要
In this study, hard carbon materials were prepared from commercial polymer (phenolic resin) and recyclable biomass (fermented sorghum) by carbonization at temperatures between 700 and 1100oC. The effects of carbonization temperatures on the composition, physical, and electrochemical properties of the prepared carbonaceous anode powders were investigated by means of elemental analysis (EA), x-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, and capacity retention studies. The results of Raman spectroscopic and XRD studies indicate the prepared samples, both obtained from phenolic resin and fermented sorghum, exhibit typical features of hard carbon. Moreover, the results of XRD and EA analyses suggest that there is residual amount of Si/SiO2 in the samples prepared from fermented sorghum, but not in those from phenolic resin. In term of electrochemical performance, the powder prepared by heat-treatment at 700 oC exhibits the highest initial discharge capacity of 391 mAh/g at a current density of 37 mAh/g among the samples obtained from fermented sorghum. However, it also shows unacceptable high initial irreversible capacity and significant capacity fading upon cycling. The powder prepared at 700 oC also exhibits the highest reversible capacity of 273 mAh/g at a current density of 37 mAh/g among the samples obtained from phenolic resin. In contrast, it is found that the samples carbonized at higher temperatures, e.g. ≧ 900 oC, show insignificant capacity fade for samples obtained from both of fermented sorghum and phenolic resin.
參考文獻
延伸閱讀
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