【摘要】：層狀LiMO_2(M=鎳、錳、鈷)兼具高比容量和高工作電壓,因而成為是最有發(fā)展前景的正極材料之一。本論文利用共沉淀方法研究制備鎳錳正極材料。通過(guò)XRD、SEM、EDS、恒電流充放電測(cè)試、EIS以及CV等探究所合成的樣品的晶體結(jié)構(gòu)、形貌以及性能。所有合成的無(wú)鈷/低鈷型鎳錳氧化物的衍射峰均屬于六方晶系,α-NaFeO_2的層狀結(jié)構(gòu),為R-3m空間點(diǎn)群。(006)/(102)和(018)/(110)兩峰的高度分裂表明一個(gè)有序的六角分層結(jié)構(gòu)。前驅(qū)體形貌為層狀,分層結(jié)構(gòu)會(huì)抑制正極和電解質(zhì)之間的副反應(yīng),提高Li~+擴(kuò)散速度。因此,樣品有良好的Li~+導(dǎo)電性和較小的Rct,提高電池的容量以及性能。結(jié)果表明,改變樣品物料比、滴加速率、升溫速率等條件,能穩(wěn)定樣品結(jié)構(gòu),改善其電化學(xué)性能。
[Abstract]:Layered LiMO_2 (M = nickel, manganese, cobalt) has become one of the most promising cathode materials because of its high specific capacity and high working voltage. In this paper, nickel-manganese cathode materials were prepared by coprecipitation method. The crystal structure, morphology and properties of the samples synthesized by XRD,SEM,EDS, constant current charge-discharge test, EIS and CV were investigated. All the diffraction peaks of cobalt-free / low cobalt Ni-mn oxides belong to hexagonal system and 偽-NaFeO_2 layered structure. It is a R 鈮，

本文編號(hào)：2479862