Material for lithium secondary battery of high performance
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Example 1
[0107] A mixed oxyhydroxide of Formula MOOH (M=Ni4 / 15(Mn1 / 2Ni1 / 2)8 / 15Co0.2) as a mixed transition metal precursor and Li2CO3 were mixed in a stoichiometric molar ratio (Li:M=1.02:1), and the mixture was sintered in air at temperatures of 850 (Ex. 1A), 900 (Ex. 1B), 950 (Ex. 1C), and 1,000° C. (Ex. 1D) for 10 hours, to prepare a lithium mixed transition metal oxide. Herein, secondary particles were maintained intact without being collapsed, and the crystal size increased with an increase in the sintering temperature.
[0108] X-ray analysis showed that all samples have a well-layered crystal structure. Further, a unit cell volume did not exhibit a significant change with an increase in the sintering temperature, thus representing that there was no significant oxygen-deficiency and no significant increase of cation mixing, in conjunction with essentially no occurrence of lithium evaporation.
[0109] The crystallographic data for the thus-prepared lithium mixed transition metal ...
Example
Comparative Example 1
[0111] 50 g of a commercial sample having a composition of LiNi0.8Co0.1Mn0.1O2 represented by Formula LiNi1-xMxO2 (x=0.3, and M=Mn1 / 3Ni1 / 3Co1 / 3) was heated in air to 750° C. (CEx. 1A), 850° C. (CEx. 1B), 900° C. (CEx. 1C) and 950° C. (CEx. 1D) (10 hrs), respectively.
[0112] X-ray analysis was carried out to obtain detailed lattice parameters with high resolution. Cation mixing was observed by Rietveld refinement, and morphology was analyzed by FESEM. The results thus obtained are given in Table 2 below. Referring to Table 2, it can be seen that all of the samples heated to a temperature of T≧750° C. (CEx. 1A-D) exhibited continuous degradation of a crystal structure (increased cation mixing, increased lattice constant and decreased c:a ratio). FIG. 6 shows a FESEM image of a commercial sample as received and a FESEM image of the same sample heated to 850° C. (CEx. 1B) in air; and it can be seen that the sample heated to a temperature of T≧850° C. (CEx. 1B-D) ex...
Example
Comparative Example 2
[0114] The pH titration was carried out at a flow rate of >2 L / min for 400 g of a commercial sample having a composition of LiNi0.8Co0.2O2. The results thus obtained are given in FIG. 7. In FIG. 7, Curve A (CEx. 2A) represents pH titration for the sample as received, and Curve B (CEx. 2B) represents pH titration for the sample heated to 800° C. in a flow of pure oxygen for 24 hours. From the analysis results of pH profiles, it can be seen that the contents of Li2CO3 before and after heat treatment were the same therebetween, and there was no reaction of Li2CO3 impurities. That is, it can be seen that the heat treatment under an oxygen atmosphere resulted in no additional production of Li2CO3 impurities, but Li2CO3 impurities present in the particles were not decomposed. Through slightly increased cation mixing, a slightly decreased c:a ratio and a slightly decreased unit cell volume from the X-ray analysis results, it was found that the content of Li slightly d...
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