本文選題：鋰離子電池 + 鈦酸鹽負(fù)極��； 參考：《新疆師范大學(xué)》2015年碩士論文

【摘要】：尖晶石結(jié)構(gòu)Li Cr Ti O4、Li Fe Ti O4、Li2Zn Ti3O8、Li2Mg Ti3O8負(fù)極材料具有結(jié)構(gòu)穩(wěn)定,成本低,環(huán)境友好,電化學(xué)性能優(yōu)異等優(yōu)點(diǎn)。是一類很有發(fā)展?jié)摿Φ匿囯x子電池負(fù)極材料。通過如XRD、SEM、TEM、CV和充放電測試等多種表征手段,系統(tǒng)的研究了合成溫度和時(shí)間對鈦酸鹽負(fù)極材料電化學(xué)性能的影響以及新型鈦酸鹽負(fù)極材料的電化學(xué)機(jī)理。1.本文采用高溫固相法合成了Li Cr Ti O4負(fù)極材料,結(jié)果表明,Li Cr Ti O4材料在電化學(xué)循環(huán)過程中結(jié)構(gòu)穩(wěn)定。800℃-12h合成的樣品具有良好的循環(huán)穩(wěn)定性和優(yōu)異的倍率性能。在電流密度為0.5C,1C,2C和5C時(shí)材料的放電容量分別為158m Ah?g-1,146m Ah?g-1,140m Ah?g-1和126m Ah?g-1。2將800℃-12h合成Li Cr Ti O4作為負(fù)極材料,Li Fe PO4/C作為正極材料組裝成Li Fe PO4/Li Cr Ti O4全電池。結(jié)果表明Li Fe PO4/Li Cr Ti O4全電池具有優(yōu)異的倍率性能和可逆性能。Li Fe PO4/Li Cr Ti O4全電池具有穩(wěn)定的充放電平臺(tái)~1.8V,在0.2C倍率下材料的放電容量為116.8m Ah?g-1,循環(huán)100周后保持在110.5m Ah?g-1。容量保持率為95%。3.采用高溫固相法700℃-8h合成了碳包覆尖晶石結(jié)構(gòu)Li Fe Ti O4材料。結(jié)果表明,碳包覆有助于提高材料的導(dǎo)電性,有利于鋰離子在Li Fe Ti O4材料中的嵌入和脫出。因此,尖晶石結(jié)構(gòu)Li Fe Ti O4/C材料的電化學(xué)性能優(yōu)于Li Fe Ti O4材料。電流密度為0.5C時(shí),Li Fe Ti O4/C材料的首周放電容量達(dá)327.8m Ah?g-1,循環(huán)50周后穩(wěn)定在308.3m Ah?g-1。在5C時(shí)保持了205m Ah?g-1放電容量。表明材料具有良好的倍率性能。4.采用高溫固相法合成了Li2MTi3O8(M=Mg,Zn)材料。研究表明,尖晶石結(jié)構(gòu)Li2MTi3O8(M=Mg,Zn)材料具有相似的晶體結(jié)構(gòu)和相似的電化學(xué)機(jī)理,表現(xiàn)出相似的充放電平臺(tái),Li2MTi3O8(M=Mg,Zn)材料結(jié)構(gòu)穩(wěn)定電化學(xué)性能測試中具有優(yōu)異的循環(huán)穩(wěn)定性和良好的庫倫效率,Li2Zn Ti3O8材料比Li2Mg Ti3O8材料具有更加優(yōu)異的電化學(xué)性能。在室溫下,充放電倍率為0.5C時(shí),Li2Zn Ti3O8首次放電容量為225.5m Ah?g-1,100周循環(huán)后保持在250m Ah?g-1。Li2Mg Ti3O8首次放電容量為215.6m Ah?g-1,100周循環(huán)后保持在225m Ah?g-1。
[Abstract]:The spinel structure Li Cr Ti O4, Li Fe Ti O4, Li2Zn Ti3O8, Li2Mg Ti3O8 anode materials have the advantages of stable structure, low cost, friendly environment and excellent electrochemical performance. It is a kind of potential anode material for lithium ion batteries. The effect of time and time on the electrochemical properties of titanate anode materials and the electrochemical mechanism of new titanate anode materials.1., Li Cr Ti O4 negative electrode was synthesized by high temperature solid phase method. The results showed that the samples of Li Cr Ti O4 materials in the electrochemical cycle process were stable and stable at.800 C -12h synthesis. Excellent multiplier performance. The discharge capacity of the material at the current density of 0.5C, 1C, 2C and 5C is 158m Ah? G-1146m Ah? G-1140m Ah? G-1 and 126m? The.Li Fe PO4/Li Cr Ti O4 full battery has a stable charging and discharging platform ~1.8V. The discharge capacity of the material is 116.8m Ah? G-1 at the 0.2C ratio. After 100 weeks, the capacity retention of the material is maintained at the capacity of high temperature solid method at 700. The results show that carbon coating helps to improve the conductivity of the material and is beneficial to the insertion and removal of lithium ion in the Li Fe Ti O4 material. Therefore, the electrochemical performance of the spinel structure Li Fe Ti O4/C material is superior to the Li Fe Ti O4 material. The discharge capacity of 205m Ah? G-1 is maintained at the time of 308.3m Ah? G-1. at 5C. It shows that the material has good multiplier performance,.4. using high temperature solid-phase method to synthesize Li2MTi3O8 (M=Mg, Zn) materials. The platform, Li2MTi3O8 (M=Mg, Zn) material has excellent cyclic stability and good Kulun efficiency. Li2Zn Ti3O8 material has more excellent electrochemical performance than Li2Mg Ti3O8. At room temperature, when the charge discharge ratio is 0.5C, the initial discharge capacity of Li2Zn Ti3O8 is 225.5m Ah. The first discharge capacity held at 250m Ah? G-1.Li2Mg Ti3O8 is 215.6m Ah? G-1100 cycle after maintaining 225m Ah? G-1..
【學(xué)位授予單位】：新疆師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM912

【參考文獻(xiàn)】

相關(guān)期刊論文 前5條

1 褚道葆;李建;袁希梅;李自龍;魏旭;萬勇;;鋰離子電池Sn基合金負(fù)極材料[J];化學(xué)進(jìn)展;2012年08期

2 陳昌國,陳佳,唐燕秋,余丹梅;鋰離子電池炭負(fù)極材料結(jié)構(gòu)的研究進(jìn)展[J];無機(jī)材料學(xué)報(bào);2003年06期

3 張歡;其魯;高學(xué)平;楊坤;張鼎;;離子交換法合成納米級鋰離子電池負(fù)極材料Li_4Ti_5O_(12)[J];無機(jī)化學(xué)學(xué)報(bào);2010年09期

4 林子夏;王剛;鄭明波;趙斌;李念武;濮林;施毅;;三維連續(xù)結(jié)構(gòu)Li_4Ti_5O_(12)/石墨烯納米復(fù)合材料:制備和其鋰離子電池超長循環(huán)性能(英文)[J];無機(jī)化學(xué)學(xué)報(bào);2013年07期

5 唐晶晶;楊娟;周向陽;陳光輝;黃濱;;一維碳納米結(jié)構(gòu)的有效合成及其在鋰離子電池負(fù)極材料中的應(yīng)用(英文)[J];Transactions of Nonferrous Metals Society of China;2014年04期

，

本文編號：2100785