本文選題：鋰離子電池 + 納米硅��； 參考：《哈爾濱工業(yè)大學(xué)》2014年碩士論文

【摘要】：本文通過對納米硅進(jìn)行表面改性，，以改善其循環(huán)穩(wěn)定性與循環(huán)效率，從而提高其電化學(xué)性能。本文首先研究了化學(xué)鍍銅改性納米硅，以及高電導(dǎo)率摻雜態(tài)導(dǎo)電聚苯胺的制備，并采用原位聚合法制備了聚苯胺包覆合金化改性納米硅基負(fù)極材料；另一個(gè)主要的研究內(nèi)容是使用硅烷偶聯(lián)劑KH570和KH550對納米硅的修飾改性，并采用原位聚合法制備聚苯胺包覆硅烷偶聯(lián)劑改性納米硅基負(fù)極材料；除此之外，還制備了原位聚合法制備聚苯胺包覆羧基修飾納米硅基負(fù)極材料等。 本文通過對摻雜態(tài)聚苯胺的合成條件研究，制備了具有電導(dǎo)率為26.0S/cm的高電導(dǎo)率摻雜態(tài)聚苯胺。通過超聲化學(xué)鍍銅改性納米硅制得的硅基負(fù)極材料的首次效率為74.8%，首次可逆容量為1607.1mAh/g，50次循環(huán)后的容量保持率為64.9%，可逆容量為1042.9mAh/g。與純納米硅相比，循環(huán)穩(wěn)定性有了較大的提升。通過原位聚合法制備的聚苯胺包覆合金化改性納米硅基負(fù)極材料，其首次效率為71.2%，首次可逆容量為1115.0mAh/g，40次循環(huán)后的容量保持率為80.8%，可逆容量為901.3mAh/g。通過硅烷偶聯(lián)劑KH570改性后的納米硅，其最好的結(jié)果如下：首次效率為62.7%，首次可逆容量為1845.1mAh/g，20次循環(huán)后的容量保持率為115.4%，可逆容量為2129.9mAh/g。通過原位聚合法制備的聚苯胺包覆硅烷偶聯(lián)劑KH570改性納米硅基負(fù)極材料，其首次效率為65.1%，首次可逆容量為1631.7mAh/g，10次循環(huán)后的容量保持率為99.8%，可逆容量為1627.9mAh/g。相對于純納米硅來說，有了很大的性能提升。此外，還進(jìn)行了硅烷偶聯(lián)劑KH550以及硅羧基化的探索。
[Abstract]:In this paper, the surface modification of nano-silicon is carried out to improve its cyclic stability and efficiency, and thus improve its electrochemical performance. In this paper, the preparation of electroless copper-plated nano-silicon and high conductivity doped conductive Polyaniline was studied. Polyaniline coated and alloyed modified nano-silicon-based negative electrode materials were prepared by in-situ polymerization. Another main research content is the modification of nano-silicon with silane coupling agents KH570 and KH550, and the preparation of Polyaniline coated silane coupling agent to modify nano-silicon-based negative electrode material by in-situ polymerization. Polyaniline coated with carboxyl group modified nano-Si-based anode materials were also prepared by in-situ polymerization. In this paper, the doped Polyaniline with high conductivity of 26.0S / cm was prepared by studying the synthesis conditions of doped Polyaniline. The first efficiency of silicon based negative electrode prepared by ultrasonic electroless copper plating modified nano-silicon is 74.8, the first reversible capacity is 1607.1 mg / g and the capacity retention is 64.9 after 50 cycles, and the reversible capacity is 1042.9 mg / g. Compared with the pure nano silicon, the cycle stability has been greatly improved. Polyaniline coated and alloyed modified nanocrystalline silicon-based negative electrode materials prepared by in-situ polymerization have the initial efficiency of 71.2and the first reversible capacity of 1115.0mAh-gr after 40 cycles. The capacity retention and reversible capacity are 80.8 and 901.3 mAh/ g respectively. The results show that the first efficiency is 62.7, the first reversible capacity is 1845.1 mAh-gn, and the capacity retention is 115.4%, and the reversible capacity is 2129.9 mAh-1 路g ~ (-1) 路L ~ (-1) 路L ~ (-1). The results show that the best results are as follows: the first efficiency is 62.7%, the first reversible capacity is 184.1 mAh-g ~ (-1) after 20 cycles. Polyaniline coated silane coupling agent KH 570 was prepared by in-situ polymerization. The first efficiency was 65.1, the first reversible capacity was 1631.7 mg / g, the capacity retention was 99.8 and the reversible capacity was 1627.9mAh/ g. Compared with the pure nano silicon, the performance has been greatly improved. In addition, the silane coupling agent KH 550 and silicon carboxylation were also explored.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM912;TQ316.6

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