本文選題：鋰離子電池 + 硅基復(fù)合材料　； 參考：《中南大學(xué)》2014年碩士論文

【摘要】：摘要：硅基材料具有非常高的理論容量及相對較低的脫嵌鋰電位平臺,被認(rèn)為是最具潛力的高能量高性能的鋰離子電池負(fù)極材料之一。本文就鋰離子電池硅基負(fù)極材料的研究進(jìn)展進(jìn)行了詳細(xì)綜述,初步研究了硅單質(zhì)的電化學(xué)性能。采用兩種不同的方法分別制備了硅/石墨/碳復(fù)合材料和硅-石墨烯復(fù)合材料,并且分別研究了其結(jié)構(gòu)形貌和電化學(xué)性能。 初步考察了鱗片石墨及納米硅的電化學(xué)性能,在50mAg-1下,納米硅首次充放電容量高達(dá)1800.2mAh g-1和3483.6mAh g-1,20次之后的容量保持率為15.2%。鱗片石墨的首次充電容量為為345.8mAh g-1,首次放電容量為434.9mAh g-1,循環(huán)性能穩(wěn)定且維持在370mAh g-1左右直至20次循環(huán)結(jié)束。 以葡萄糖、納米硅和鱗片石墨為原料,采用液相固化以及高溫?zé)峤饨Y(jié)合的方法法制備硅/石墨/碳復(fù)合材料(Si/G/C復(fù)合材料),考察了不同硅與鱗片石墨相對質(zhì)量比對Si/G/C復(fù)合材料的結(jié)構(gòu)及性能的影響。當(dāng)納米硅與鱗片石墨的質(zhì)量之比為3：7時,Si30FG70復(fù)合材料的綜合電化學(xué)性能最佳,首次充電比容量和放電比容量分別為733.6mAh g-1和1048.3mAh g-1,首次庫倫效率為69.9%,20次之后的容量保持率為80.1%。 以納米硅和氧化石墨烯為原料,通過一種白組裝的手段和水熱還原的方法制備了硅-石墨烯復(fù)合材料。考察了不同氧化石墨烯水溶液濃度對材料電化學(xué)性能的影響,當(dāng)石墨烯水溶液濃度為2mg/mL時,得到的Si-G-2復(fù)合材料循環(huán)性能最佳,首次充放電比容量分別為1123.3mAh g-1和2259.4mAh g-1.首次庫倫效率為49.7%,50次之后的可逆比容量為871.1mAh g-1,容量保持率為77.5%。
[Abstract]:Abstract: Silicon based materials with very high theoretical capacity and relatively low deintercalated lithium potential platform are considered as one of the most promising high energy and high performance cathode materials for lithium ion batteries. In this paper, the research progress of silicon based anode materials for lithium ion batteries is reviewed in detail, and the electrochemical properties of silicon simple materials are preliminarily studied. Silicon / graphite / carbon composites and silicon-graphene composites were prepared by two different methods, and their structural morphology and electrochemical properties were studied. The electrochemical properties of flake graphite and nanocrystalline silicon were preliminarily investigated. The first charge and discharge capacity of nano-silicon was as high as 1800.2mAh g-1 and 3483.6mAh g-1 after 20 times of 1800.2mAh g ~ (-1) and the capacity retention rate was 15.2g ~ (-1) under 50mAg-1. The initial charging capacity of flake graphite is 345.8mAh g-1 and the initial discharge capacity is 434.9mAh g-1. The cyclic performance of flake graphite is stable and maintained at 370mAh g-1 until the end of 20 cycles. Using glucose, nano-silicon and flake graphite as raw materials, Silicon / graphite / carbon composites (Si / G / C composites) were prepared by liquid solidification and pyrolysis at high temperature. The effects of the relative mass ratio of silicon to flake graphite on the structure and properties of Si / G / C composites were investigated. When the mass ratio of nano-silicon to flake graphite is 3:7, the comprehensive electrochemical properties of Si30FG70 composite are the best. The first charge and discharge specific capacities are 733.6mAh g-1 and 1048.3mAh g-1, respectively, and the capacity retention of Si30FG70 composite is 80.1 after the first Coulomb efficiency is 69.9%. Silicon graphene composites were prepared by white assembly and hydrothermal reduction with nano-silicon and graphene oxide as raw materials. The effect of different concentration of graphene oxide solution on the electrochemical properties of the composite was investigated. When the concentration of graphene aqueous solution was 2 mg / mL, the cyclic performance of Si-G-2 composite was the best. The initial charge-discharge capacity of Si-G-2 composite was 1123.3mAh g-1 and 2259.4mAh g-1, respectively. After the first Coulomb efficiency of 49.7 and 50 times, the reversible specific capacity is 871.1mAh g-1, and the capacity retention is 77.5%.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM912

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