本文選題：鎳鈷錳酸鋰材料 + 振實密度��； 參考：《哈爾濱工業(yè)大學(xué)》2015年碩士論文

【摘要】：技術(shù)革新是當(dāng)今時代的潮流,而技術(shù)變革實現(xiàn)的基礎(chǔ)又往往要依賴于能源的更新?lián)Q代。鋰離子電池作為新能源的典型代表,對信息社會中的產(chǎn)業(yè)革新有著不可替代的重要作用。富鎳組分的鎳鈷錳酸鋰材料,被認為是一種具有良好應(yīng)用前景的一種鋰離子電池中正極材料,具有重要的研究價值。經(jīng)過近些年的研究和發(fā)展,鎳鈷錳酸鋰材料在實際應(yīng)用方面有了長足的進步,但仍然面臨著振實密度不夠理想及前驅(qū)體制備過程中的內(nèi)部變化過程不清晰等問題,這些問題的存在不利于其更廣泛的應(yīng)用,也阻礙了人們對其的深入理解。本文的主要研究內(nèi)容即為對鎳鈷錳酸鋰材料振實密度、一次顆粒以及前驅(qū)體所含雜質(zhì)的研究。通過控制影響鎳鈷錳酸鋰振實密度的三個主要因素:粒度分布跨度、顆粒內(nèi)部堆積緊密度以及顆粒形狀規(guī)整度,本文實現(xiàn)了對鎳鈷錳酸鋰前驅(qū)體及燒結(jié)后材料振實密度的優(yōu)化,在實驗過程中,結(jié)合振實密度測試、粒度分布測試、比表面積測試以及掃描電子顯微鏡測試等手段考察優(yōu)化過程中三個主要因素的變化情況。最終,實現(xiàn)制備出的鎳鈷錳酸鋰前驅(qū)體材料振實密度2.10 g/cm3,燒結(jié)后材料振實密度2.77 g/cm3。通過改變鎳鈷錳酸鋰前驅(qū)體材料制備過程中的反應(yīng)時間、p H值、溫度以及氨/金屬離子進料比例,本文主要研究了在單個工藝條件發(fā)生變化時,鎳鈷錳酸鋰材料的一次顆粒變化情況。結(jié)合掃描電子顯微鏡測試、振實密度測試、比表面積測試等手段考察在變化工藝條件時,一次顆粒尺寸、形貌以及堆積緊密度等的變化情況。最終,發(fā)現(xiàn)了不同工藝條件對鎳鈷錳酸鋰材料的影響情況并給出影響成因。提出了不同工藝條件對一次顆粒的影響程度的高低順序為:p H值反應(yīng)時間氨/總金屬離子進料速率比反應(yīng)溫度。通過結(jié)合XRD、XPS、CV等多種測試表征手段,本文研究了在采用共沉淀法制備鎳鈷錳酸鋰前驅(qū)體材料時常會引入的深顏色雜質(zhì)。探究了雜質(zhì)存在對電化學(xué)性能的影響并分析了雜質(zhì)的成分。提出了雜質(zhì)生成的誘因,為其他研究人員提供了參考。
[Abstract]:Technological innovation is the trend of the times, and the foundation of technological change often depends on the renewal of energy. As a typical representative of new energy, lithium ion battery plays an irreplaceable role in industrial innovation in information society. Nickel-rich lithium nickel-cobalt manganese oxide is considered to be a kind of cathode material in lithium ion batteries which has a good prospect of application and has important research value. Through the research and development in recent years, the Ni-Co LiMnO _ 4 material has made great progress in practical application, but it still faces the problems of not ideal density and unclear internal change process during the preparation of precursor. The existence of these problems is not conducive to its wider application, but also hinders the in-depth understanding of them. The main research content of this paper is to study the vibrational density, primary particle and impurity in the precursor of nickel cobalt manganese oxide material. By controlling the three main factors that affect the vibrational density of lithium nickel-cobalt manganese oxide, such as the particle size distribution span, the compactness inside the particle and the shape regularity of the particles, the vibratory density of the precursor and the sintered materials are optimized in this paper. In the course of the experiment, the changes of three main factors in the optimization process were investigated by means of vibrational density test, particle size distribution test, specific surface area test and scanning electron microscope test. Finally, the vibrational density of the prepared precursor is 2.10 g / cm ~ (3), and that of the sintered material is 2.77 g / cm ~ (3). By changing the reaction time (pH), temperature and the ratio of ammonia to metal ions in the preparation of Ni-Co LiMnO _ 4 precursor, this paper mainly studied when the single process conditions changed. Primary particle variation of nickel-cobalt-lithium manganese oxide materials. Scanning electron microscopy (SEM), vibrational density measurement and specific surface area measurement were used to investigate the change of primary particle size, morphology and packing tightness when the technological conditions were changed. Finally, the influence of different technological conditions on the nickel-cobalt-manganese-manganese material was found and the cause of the influence was given. The order of the influence of different technological conditions on the primary particle is: the reaction time of the ratio of ammonia to the feed rate of the total metal ions is 1: pH and the reaction temperature is the same as that of the reaction temperature. By combining with XRDX XPS CV and other means of measurement and characterization, the dark color impurities often introduced in the preparation of Ni-Co-Mn precursor materials by co-precipitation method were studied. The influence of impurity on electrochemical performance was investigated and the composition of impurity was analyzed. The inducement of impurity formation is put forward, which provides reference for other researchers.
【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】：2015
【分類號】：TM912

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本文編號：1798718