發(fā)布時(shí)間：2018-05-14 21:35

  本文選題：納米材料 + 鋰離子電池��； 參考：《寧波大學(xué)》2017年碩士論文

【摘要】：本論文首次以靜電紡絲法合成了KNb_3O_8、K_(5.75)Nb_(10.85)O_(30)和K_2Nb_6O_(16)的一維鈮酸鉀納米材料,并首次探索了這三種物質(zhì)的儲(chǔ)鋰性能。本文分為五章。第1章,簡(jiǎn)要指出了本文的研究背景與選題意義,并重點(diǎn)介紹了納米材料特別是一維納米材料的特性、應(yīng)用和主要制備方法。最后概述了論文的選題意義。第2章,以草酸鈮,草酸和乙酸鉀為主要原料,采用了靜電紡絲法結(jié)合煅燒工藝合成了團(tuán)聚嚴(yán)重的KNb_3O_8納米棒。該KNb_3O_8為不是很穩(wěn)定的類四邊形結(jié)構(gòu),含有兩種鈮離子。KNb_3O_8用作電極材料時(shí)有一定儲(chǔ)鋰性能,但是其性能較差。在循環(huán)性能測(cè)試中,KNb_3O_8納米棒首周的充電比容量為156.5 mAh g-1,第50周的充電比容量為65.6 mAh g-1。前50周的充電比容量保持率僅為41.9%。第3章,以草酸鈮,草酸和乙酸鉀為主要原料,采用了靜電紡絲法結(jié)合煅燒工藝合成了分散的K_(5.75)Nb_(10.85)O_(30)納米棒。該K_(5.75)Nb_(10.85)O_(30)為不太穩(wěn)定的類四邊形結(jié)構(gòu),只有一種鈮離子。用作鋰離子電池電極材料時(shí),K_(5.75)Nb_(10.85)O_(30)納米棒有良好的的倍率性能和循環(huán)性能。在倍率性能測(cè)試中,樣品在第1周、第11周、第21周、第31周、第41周的充電比容量分別是153.2、107.4、81.7、64.7、113.7 mAh g-1。在循環(huán)性能測(cè)試中,K_(5.75)Nb_(10.85)O_(30)的前15周的充電比容量衰減較快,之后趨于穩(wěn)定。K_(5.75)Nb_(10.85)O_(30)納米材料從第15周到第90周的充電比容量的單周平均衰減率僅為0.2%。第4章,以草酸鈮,草酸和乙酸鉀為主要原料,采用了靜電紡絲法結(jié)合煅燒工藝合成了分散的K_2Nb_6O_(16)棒。該K_2Nb_6O_(16)的結(jié)構(gòu)主要是比較穩(wěn)定的五邊形結(jié)構(gòu),且只有一種鈮離子。研究結(jié)果表明,K_2Nb_6O_(16)納米材料具有優(yōu)異的倍率性能和循環(huán)性能。在倍率性能測(cè)試中,K_(5.75)Nb_(10.85)O_(30)在第1周、第11周、第21周、第31周、第41周的充電比容量分別是94.3、80.5、61.1、43.6、88.7 mAh g-1。在循環(huán)性能測(cè)試中,第1周的充電比容量為94.8 mAh g-1,第90周的充電比容量為65.7 mAh g-1。第1周到第90周的充電比容量的單周平均衰減率僅為0.8%。第5章,簡(jiǎn)單總結(jié)了本論文的工作并展望了課題可能的發(fā)展。
[Abstract]:In this paper, the one-dimensional potassium niobate nanomaterials of KNb3OS _ 8K _ S _ (5.75) and K _ 2Nb _ (6) O _ (16) have been synthesized by electrospinning for the first time, and the lithium storage properties of these three substances have been explored for the first time. This paper is divided into five chapters. In chapter 1, the research background and significance of this paper are briefly pointed out, and the characteristics, applications and main preparation methods of nanomaterials, especially one-dimensional nanomaterials, are emphatically introduced. Finally, the significance of the thesis is summarized. In chapter 2, KNb_3O_8 nanorods with severe agglomeration were synthesized by using niobium oxalate, oxalic acid and potassium acetate as main raw materials. The KNb_3O_8 is an unstable quadrilateral structure and contains two kinds of niobium ions. KNbSZ _ 3O _ (8) has some lithium storage properties when it is used as electrode material, but its performance is poor. In the cycle performance test, the charge specific capacity of the KNbS _ 3O _ 8 nanorods was 156.5 mAh g ~ (-1) in the first week and 65.6 mAh g ~ (-1) in the 50 ~ (th) week. The charge specific capacity retention rate for the first 50 weeks was only 41.9. In chapter 3, using niobium oxalate, oxalic acid and potassium acetate as the main raw materials, the dispersed K _ S _ (5.75) NbS _ (10.85) O _ (30) nanorods were synthesized by electrospinning method and calcination process. The Kill 5.75 NbSch 10.85 O\ + _ (30) is an unstable quadrilateral structure with only one niobium ion. When used as electrode material for lithium-ion battery, the nanorods have good rate performance and cycling performance. In the rate performance test, the charge specific capacity of the sample at week 1, week 11, week 21, week 31 and week 41 is 153.2107.4 渭 m, 64.7113.7 mAh g-1, respectively. In the cycle performance test, the charge specific capacity of Kstack 5.75 / NbSerp 10.85 / O / C) decreased rapidly in the first 15 weeks and then tended to be stable. The average attenuation rate of charge specific capacity of the nanomaterials from the 15th to the 90th week was only 0.2k.Then, the average attenuation rate of the charge specific capacity of the nanomaterials from the 15th week to the 90th week was only 0.22%. In chapter 4, using niobium oxalate, oxalic acid and potassium acetate as main raw materials, the dispersed K _ 2NbS _ 6O _ (16) rod was synthesized by electrospinning method and calcination process. The structure of the K2Nb6O _ (16) is mainly a relatively stable pentagonal structure, and there is only one niobium ion. The results show that the nanocomposites have excellent rate performance and cycle performance. In the rate performance test, the specific charge capacity of mAh in the first week, the 11th week, the 21st week, the 31st week, and the 41st week were 94.3 / 80.5 / 61.1 / 43.6/ mAh / g ~ (-1), respectively, and the specific charge capacity was 10.85 mAh / g ~ (30) in the first week, the 11th week, the 21st week, the 31 th week, the 41 th week, respectively. In the cycle performance test, the charging specific capacity was 94.8 mAh g-1 in the first week and 65.7 mAh g-1 in the 90th week. The average weekly attenuation rate of the charge specific capacity from week 1 to week 90 is only 0.8. In chapter 5, the work of this thesis is summarized and the possible development of this thesis is prospected.
【學(xué)位授予單位】：寧波大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TQ340.64;TB383.1

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