摘要锂离子三元复合正极材料是以镍盐、钴盐、锰盐及锂盐为原料合成的镍钴锰酸锂材料,具有良好的电化学性能。本论文综述了锂离子三元电极材料的研究现状。以NiCl2•6H2O、MnCl2•4H2O、CoCl2•6H2O和LiCO3为主要原料合成,在空气、氮气、氩气等三种不同气体氛围中,用间接共沉淀法、溶胶-凝胶法、高温固相法等三种不同方法以丁二酸作为碳源的含碳量分别为5%、10%等条件和方法制备目标产物Li1。2Ni0。56Co0。21Mn0。18O2。实验合成了7个样品,使用电池测试系统对所制锂离子电池进行充放电循环测试。实验结果表明:采用溶胶-凝胶法制得的含碳5%的样品5的性能较好,其首次充电比容量为105。556mAh•g-1。74241
毕业论文关键词:锂离子电极材料;正极材料;Li1。2Ni0。56Co0。21Mn0。18O2;电化学性能
Abstract Lithium ion ternary composite cathode material is the nickel cobalt lithium manganate material。 This material is synthesized by raw material contained nickel salt, cobalt salt, manganese salt and lithium salt, which is of a good electrochemical performance。 In this paper, the research status of lithium ion three element electrode materials is reviewed。 This experiment used the raw material contained NiCl2•6H2O, MnCl2•4H2O, CoCl2•6H2O and LiCO3 for the synthesis of the target product。 In addition, this research investigated the influence to the electrochemical performance, which is caused by several factors, including the atmosphere in air, nitrogen, argon; three preparation methods under co precipitation method, sol-gel method, solid-state method; the carbon content of 5%, 10%, and without carbon, which used succinic acid as a carbon source。 Through the above experiments, 7 samples were synthesized, and tested the charge discharge cycle by the use of battery testing system。 The sample 5 of 5% carbon content prepared under Sol-gel method is of better performance, which the first charge capacity is 105。556mAh•g-1
Keyword: Lithium ion batteries; cathode material; Li1。2Ni0。56Co0。21Mn0。18O2; electrochemical properties
目 录
1引言 4
2锂离子三元电极材料研究现状 4
2。1三元正极电极材料的制备方法 4
2。1。1化学共沉淀法 4
2。1。2 溶胶-凝胶法 4
2。1。3高温固相法 5
2。1。4喷雾热解法 5
2。1。5微波合成法 5
2。2三元复合正极材料的改性方法 5
2。2。1元素掺杂 5
2。2。2表面包覆 6
2。3锂离子三元电极材料的前景展望 6
3 Li1。2Ni0。56Co0。21Mn0。18O2电极材料的合成及表征 6
3。1仪器及设备 6
3。2药品及试剂 6
3。3电极材料的制备 6
3。3。1样品1的制备(共沉淀法,空气氛围) 6
3。3。2样品2的制备(共沉淀法,氮气氛围) 7
3。3。3样品3的制备(共沉淀法,氩气氛围) 7
3。3。4样品4的制备(溶胶—凝胶法,不加碳) 7
3。3。5样品5的制备(溶胶—凝胶法,加5%碳)