PDF (4828K)
摘要
对共沉淀法合成(Ni0.5Mn1.5)(OH)4前驱体的主要工艺参数展开了详细讨论,结果表明:当pH=10和螯合剂浓度为1mol/L时,其前驱体颗粒表现为球形且具有最高的密度;对终产物LiNi0.5Mn1.5O4材料的物化性能和电化学性能进行了测试分析,扫描电镜和X射线衍射表征结果表明:其由直径为2～3μm、不规则形状的一次颗粒堆积成二次颗粒,产物不含有Li1-xNixO或NiOx等不纯物;该样品具有较好的倍率和优秀的循环性能,可能归结于终产物具有较高的纯度,不含有杂相。
Abstract
LiNi0.5Mn1.5O4 material was synthesized with coprecipitation method.Single-factor experiment method,in conjunction with SEM and Tap density test were utilized to study the influence of various factors,including pH and the concentration of chelating agent on the morphology of precursor (Ni0.5Mn1.5)(OH)4.The results showed that the optimized condition for (Ni0.5Mn1.5)(OH)4 precursor may be summarized as:pH=10 and the concentration of NH3·H2O was equal to 1mol/L.Additionally,the physic-chemistry properties and electrochemical performances of LiNi0.5Mn1.5O4 obtained from the precursor with the highest density were also measured by SEM,XRD and electrochemical test.The result showed that:(1)LiNi0.5Mn1.5O4 was maintained the morphology in its precursor and composed of primary particle with the diameter of 2～3μm;(2)the final product had a pure phase without any impurities such as Li1-xNixO or NiOx;(3)LiNi0.5Mn1.5O4 displayed excellent rate and cycling performance,which can be attributed to its high purity.
关键词
尖晶石
/
LiNi0.5Mn1.5O4
/
共沉淀法
/
正极材料
Key words
spinel
/
LiNi0.5Mn1.5O4
/
co-precipitation method
/
anode
共沉淀法合成LiNi0.5Mn1.5O4的工艺及其形貌控制研究[J].
化工新型材料, 2018, 46(2): 147-150 DOI:
[1] 钟新仙,胡思江,王红强,等.镍铬复合掺杂尖晶石锰酸锂的合成与性能研究[J].化工新型材料,2009,37(10):54-56.
[2] Shi S Q,Ouyang C Y,Wang D S,et al.The effect of cation doping on spinel LiMn2O4:a first-principles investigation[J].Solid State Communications,2003,126(9):531-534.
[3] 李军,刘建军,李少芳,等.锂离子电池三元正极材料镍钴铝酸锂的研究进展[J].化工新型材料,2016,44(6):49-51.
[4] 刘永光,朱靖,王岭.锂离子电池三元复合阴极材料研究进展[J].化工新型材料,2012,40(2):35-37.
[5] Amine K,Tukamoto H,Yasuda H,et al.A new three-volt spinel Li1+xMn1.5Ni0.5O4 for secondary lithium batteries[J].Journal of the Electrochemical Society,1996,143(5):1607-1613.
[6] Nichols Jr A R,Walton J H.The autoxidation of manganous hydroxide[J].Journal of the American Chemical Society,1942,64(8):1866-1870.
[7] Chang Z R,Dai D M,Tang H W,et al.Effects of precursor treatment with reductant or oxidant on the structure and electrochemical properties of LiNi0.5Mn1.5O4[J].Electrochimica Acta,2010,55(19):5506-5510.
[8] Shaju K M,Bruce P G.Nano-LiNi0.5Mn1.5O4 spinel:a high power electrode for Li-ion batteries[J].Dalton Transactions,2008(40):5471-5475.
基金资助
国家自然科学基金(51602101);湖南省自然科学基金(2016JJ4044);湖南省科技计划项目(2016TP1028)
