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Synthesis and Modification of LiNixCoyMnzO2Cathode Material for Lithium Battery

Author: LiLong
Tutor: ZhaoShiZuo; ChenNengTong
School: Tsinghua University
Course: Materials Engineering
Keywords: LiNi0.8Co0.1Mn0.1O2 core-shell structure LiNi0.4Co0.2Mn0.4O2 surface modification electrochemical performance
CLC: TM912
Type: Master's thesis
Year: 2012
Downloads: 295
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Abstract


LiNixCoyMnzO2has attracted numerous researchers’ interest for its highspecific capacity, high tap tensity and excellent high temperature performance,and becomes one of the best systems of cathode materials for lithium battery.LiNixCoyMnzO2is usually produced via hydroxide co-precipation method inindustrial process.At the present days, the relative mature production incommercial of this system areLiNi1/3Co1/3Mn1/3O2,LiNi0.4Co0.2Mn0.4O2,LiNi0.5Co0.2Mn0.3O2. The dischargecapacity of these materials can reach160170mAh/g, but there still exists ahuge disparity compared to the theory specific capacity of material.The capacity of high Ni content LiNi0.8Co0.1Mn0.1O2is close to its theoryspecific capacity.However, due to its poor structure stability, the high capacitypotential is hard to fully exploited.So the modification of LiNi0.8Co0.1Mn0.1O2becomes a hot research topic.What’s more, due to the intense corrosion effect ofHF decomposed from LiPF6, which is a main constitute of electrolyte, thedischarge capacity performance of LiNixCoyMnzO2at high rate is poor. Thisproblem could be reduced through surface modification, which can play a roleof protecting and stabling strcture. This passage adopts LiNi0.4Co0.2Mn0.4O2asexample, proving proper surface modification can improve the performance ofLiNi0.4Co0.2Mn0.4O2at high rate.Experiment part of the passage is consisted of two main parts: synthsis ofLi[Ni0.8Co0.1Mn(0.1)]0.4[Ni0.5Co0.2Mn0.3]0.6O2(denoted by LiNi0.62Co0.16Mn0.22O2)with a core-shell structure and the surface modification of LiNi0.4Co0.2Mn0.4O2.First part mainly narratives the synthsis of precuesors vie the hydroxiteco-precititation. The sintering process is definited through TG test. Aftersintered with lithium resource, we obtained the aimedmaterial-LiNi0.62Co0.16Mn0.22O2, the electrochemical performance of whichimproved a lot compared with pure LiNi0.8Co0.1Mn0.1O2. The second part ismainly focused on the surface modification of LiNi0.4Co0.2Mn0.4O2usingSiO2/SnO2, seperately. The best coating amount is definited through electrochemical experiment. The high rate performance of LiNi0.4Co0.2Mn0.4O2is greatly improved after coating0.5wt%SiO2.

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