【摘要】：鋰離子電池由于其比容量高,電壓大,壽命長(zhǎng),環(huán)保等特點(diǎn)成為當(dāng)代最具有潛能的能源之一。而隨著鋰離子電池在全球范圍內(nèi)的應(yīng)用越來越廣泛,人們對(duì)其性能的要求也有所提高,開發(fā)一種新型鋰離子電池負(fù)極材料成為人們關(guān)注的熱點(diǎn)。金屬有機(jī)配位聚合物作為一種新型材料,本身及其衍生物的電化學(xué)性能逐步得到了人們廣泛關(guān)注,成為鋰離子電池負(fù)極材料一個(gè)不錯(cuò)選擇。本文通過水熱法成功合成了摻雜的含鐵金屬有機(jī)配位聚合物及其衍生物,并研究它們?cè)阡囯x子電池中的應(yīng)用,具體研究?jī)?nèi)容如下:(1)通過水熱合成功合成出一種含鐵和鋅,具有一維多孔結(jié)構(gòu)的金屬有機(jī)配位聚合物,并對(duì)其結(jié)構(gòu),物相形貌進(jìn)行表征。將其和石墨烯復(fù)合后表現(xiàn)出良好的電化學(xué)性能,在電流密度為50mA/g下,循環(huán)100個(gè)周期后比容量仍可達(dá)到305mAh/g。將其作為前驅(qū)體在空氣中進(jìn)行煅燒,形成氧化物首次比容量可達(dá)到3082mAh/g。而在氮?dú)庵徐褵玫降奶?氧化物,其首次比容量為1364mAh/g,循環(huán)100個(gè)周期后比容量仍可保持為230mAh/g。(2)通過改變鐵和鋅比例得到結(jié)構(gòu)不同的金屬有機(jī)配位聚合物,并表征結(jié)構(gòu)和形貌。將其和石墨烯進(jìn)行復(fù)合做成電極材料,在50m A/g的電流密度下,首次比容量為1621mAh/g,100個(gè)周期的循環(huán)之后,比容量仍可穩(wěn)定在200mAh/g。通過配合物作為前驅(qū)體高溫?zé)峤夥椒ǖ玫降难趸?首次充放比容量較高,碳包覆的金屬氧化物循環(huán)100周期的比容量為260m Ah/g。(3)通過水熱法合成了含鐵,鋅,鋰三元金屬有機(jī)配位聚合物,其電化學(xué)測(cè)試表明首次比容量較高,可達(dá)3636mAh/g,但循環(huán)穩(wěn)定性能不好,通過與石墨烯復(fù)合,得到的復(fù)合材料循環(huán)100個(gè)周期的比容量可達(dá)159mAh/g。將前驅(qū)體進(jìn)行煅燒后首次比容量為1191mAh/g,循環(huán)100周期后的可逆比容量約80mAh/g。(4)成功合成了含鐵和錳的金屬有機(jī)配位聚合物,并對(duì)其結(jié)構(gòu),形貌進(jìn)行表征。將其作為電極材料,其首次比容量為1444mAh/g,循環(huán)100個(gè)周期后可逆比容量可達(dá)146mAh/g。其與石墨烯復(fù)合后循環(huán)100周期后的比容量提高為323mAh/g。
[Abstract]:Lithium ion battery has become one of the most potential energy sources due to its high specific capacity, high voltage, long life and environmental protection. With the application of lithium-ion battery in the world, the demand for its performance has been improved, and the development of a new negative electrode material for lithium ion battery has become a hot spot. As a new type of material, metal-organic coordination polymers have been paid more and more attention on their electrochemical properties and their derivatives, and have become a good choice for anode materials of lithium ion batteries. In this paper, Fe containing organometallic coordination polymers and their derivatives have been successfully synthesized by hydrothermal method, and their applications in lithium ion batteries have been studied. The main contents are as follows: (1) A kind of iron and zinc was successfully synthesized by hydration. The structure and morphology of organometallic coordination polymers with one dimensional porous structure were characterized. Under the current density of 50mA/g, the specific capacity can reach 305 mg / g after 100 cycles. It was calcined in air as a precursor, and the first specific capacity of the oxide was 3 082 mg / g. The first specific capacity of carbon / oxide calcined in nitrogen is 1364mAh-1 / g, and after 100 cycles, the specific capacity can still be kept at 230 mAh-g. (2) by changing the ratio of iron and zinc, the organometallic coordination polymers with different structure can be obtained. The structure and morphology were characterized. At the current density of 50 Ma / g, the first specific capacity is 1621mAh-g. after 100 cycles, the specific capacity is still stable at 200mAh/ g. The oxides obtained by pyrolysis of the complex at high temperature have high specific capacity for the first time. The specific capacity of the carbon-coated metal oxide cycle is 260 m Ah/g. (3). Iron and zinc have been synthesized by hydrothermal method. The electrochemical measurements of lithium ternary organometallic coordination polymers show that the first specific capacity is high, up to 3636mAh/ g, but the cyclic stability is not good. The specific capacity of 100 cycles of the composites is up to 159mAh/ g by combining with graphene. The first specific capacity of the precursor after calcination is 1191 mAh/ g, and the reversible specific capacity of the precursor after 100 cycles is about 80 mAh / g. (4) the organometallic coordination polymers containing iron and manganese have been successfully synthesized, and their structure and morphology have been characterized. When it is used as electrode material, its first specific capacity is 1444mAh/ g, and the reversible specific capacity can reach 146mAh/ g after 100 cycles. The specific capacity of the composite with graphene was increased to 323mAh/ g after 100 cycles.
【學(xué)位授予單位】：沈陽(yáng)工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：O641.4;TM912

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本文編號(hào)：2377085