本文關(guān)鍵詞： 鋁離子電池 山峰形Ni_3S_2 第一性原理 花瓣狀MoS_2 繡球形CoS　出處：《青島科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：鋁離子電池由于其獨特的三個電子參與氧化還原反應(yīng)特性,使其具有高的理論容量,加之良好的安全特性、低的可燃性、低廉的成本,因此,其被認為是一種很有前途的新型儲能器件。此外,由于過渡金屬硫化物的S_2-離子和Al3+離子之間有較弱的離子鍵,有利于Al3+的嵌入/脫出正極材料,因此被視為鋁離子電池正極材料很好的候選材料。本文通過水熱法制備出系列過渡金屬硫化物正極材料,優(yōu)選出最佳工藝條件并對正極材料進行性能測試、表征,最后建立了性能優(yōu)化機理模型,主要內(nèi)容如下:(1)以泡沫Ni和硫代乙酰胺為原料,通過原位合成的方法直接在泡沫Ni基板上合成出了3D山峰形Ni_3S_2/Ni正極材料。著重研究了硫代乙酰胺濃度、反應(yīng)溫度及反應(yīng)時間等工藝參數(shù)對電化學(xué)性能的影響規(guī)律,并通過條件實驗優(yōu)選出制備Ni_3S_2/Ni的工藝參數(shù)。研究結(jié)果表明,優(yōu)選工藝參數(shù)為:硫代乙酰胺濃度為0.33m Mol/L、反應(yīng)溫度為150oC、反應(yīng)時間為15h。優(yōu)選工藝條件下,制備產(chǎn)物具有較大放電容量(236m Ah/g),較高的放電電壓平臺(0.7V)以及良好的循環(huán)穩(wěn)定性(90次循環(huán))。此外,基于實驗和第一性原理計算,揭示了Ni_3S_2/Ni正極材料的充放電機理為Al3+嵌入/脫出Ni_3S_2正極材料形成Alx Ni_3S_2固溶體。(2)以鉬酸鈉和硫代乙酰胺為原料,去離子水為溶劑,采用水熱法制備出具有優(yōu)異電化學(xué)性能的花瓣狀納米結(jié)構(gòu)Mo S_2正極材料。著重研究了反應(yīng)溫度、反應(yīng)時間等工藝參數(shù)對產(chǎn)物形貌及電化學(xué)性能的影響規(guī)律,并通過條件實驗優(yōu)選出制備Mo S_2的工藝參數(shù)。研究結(jié)果表明,優(yōu)選工藝參數(shù)為:反應(yīng)溫度200oC、反應(yīng)時間為28小時。優(yōu)選工藝條件下,制備產(chǎn)物的首次放電容量可以達到127.8m Ah/g,經(jīng)過50次循環(huán),電池的放電容量依然維持在44.4m Ah/g左右,庫倫效率維持在110%。此外,基于電化學(xué)反應(yīng)示意圖和電化學(xué)反應(yīng)方程式,揭示了Mo S_2正極材料的充放電機理。(3)以氯化鈷為鈷源,硫脲為硫源,去離子水和乙二醇為溶劑,采用水熱的方法制備出具有優(yōu)異電化學(xué)性能繡球形納米結(jié)構(gòu)Co S正極材料。著重研究了反應(yīng)溫度、反應(yīng)時間等工藝參數(shù)對產(chǎn)物形貌及電化學(xué)性能的影響規(guī)律,并通過條件實驗優(yōu)選出制備Co S的工藝參數(shù)。研究結(jié)果表明,優(yōu)選工藝參數(shù)為:反應(yīng)溫度為150oC、反應(yīng)時間為15h時。優(yōu)選工藝條件下,制備產(chǎn)物具有最大的放電容量(179.2m Ah/g),高的放電電壓平臺(0.55V),好的循環(huán)穩(wěn)定性(50次循環(huán))。此外,基于電化學(xué)基本原理,揭示了Co S正極材料的充放電機理。
[Abstract]:Aluminum ion batteries have high theoretical capacity, good safety, low flammability and low cost because of their unique characteristics of three electrons involved in the redox reaction. It is considered to be a promising new type of energy storage device. In addition, due to the transition metal sulfides, there is a weak ionic bond between the S _ 2- ion and the Al3 ion. It is considered as a good candidate material for aluminum ion battery cathode material because of its favorable embedding / removing cathode material of Al3. In this paper, a series of transition metal sulfide cathode materials were prepared by hydrothermal method. The optimum process conditions were selected, and the properties of the cathode materials were tested and characterized. Finally, the performance optimization mechanism model was established. The main contents are as follows: 1) the foam Ni and thioacetamide were used as raw materials. The 3D peak shape Ni_3S_2/Ni cathode material was synthesized directly on the foamed Ni substrate by in-situ synthesis. The concentration of thioacetamide was studied emphatically. The influence of reaction temperature and reaction time on the electrochemical properties of Ni_3S_2/Ni was studied. The optimum technological parameters are as follows: thioacetamide concentration is 0.33m mol / L, reaction temperature is 150oC, reaction time is 15h. The prepared product has a large discharge capacity of 236m / g, a high discharge voltage platform of 0.7V) and a good cycle stability of 90 cycles. Based on experiments and first-principles calculations. The charge-discharge mechanism of Ni_3S_2/Ni cathode materials is that Al3 intercalates / deletes Ni_3S_2 cathode materials to form Alx Ni_3S_2 solid solution. Sodium molybdate and thioacetamide were used as raw materials. The petal-like nanostructure Mo / S _ 2 cathode material with excellent electrochemical properties was prepared by hydrothermal method in deionized water. The reaction temperature was studied emphatically. The influence of reaction time and other process parameters on the morphology and electrochemical performance of the product was studied. The optimum process parameters are as follows: reaction temperature 200oC, reaction time 28h. Under the optimum conditions, the first discharge capacity of the product can reach 127.8 m Ah/g. After 50 cycles, the discharge capacity of the battery is still about 44.4 m Ah/g, and the Coulomb efficiency is 110. In addition, based on the schematic diagram of electrochemical reaction and the equation of electrochemical reaction. The charge-discharge mechanism of Mo-S2 cathode material was revealed. The cobalt chloride was used as cobalt source, thiourea as sulfur source, deionized water and ethylene glycol as solvent. Nanostructured Co S cathode materials with excellent electrochemical properties were prepared by hydrothermal method. The reaction temperature was studied emphatically. The influence of reaction time on the morphology and electrochemical performance of the product was studied. The optimum process parameters are as follows: the reaction temperature is 150oC, the reaction time is 15h, and the maximum discharge capacity of the product is 179.2m Ah路 g). In addition, the charging and discharging mechanism of Co S cathode materials is revealed based on the basic principle of electrochemistry.
【學(xué)位授予單位】：青島科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TB33;TM912

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相關(guān)期刊論文 前7條

1 林秀敏;朱浩;周愛;;熱電池陰極材料CoS_2制備及成型加工工藝現(xiàn)狀[J];電源技術(shù);2016年09期

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本文編號：1460716