Improved Electrochemical Properties and Structural Stability of Overlithiated Li1 + x ( Ni1 ∕ 3Co1 ∕ 3Mn1 ∕ 3 ) 1 − x O2 Prepared by Spray-Drying Method
Improved Electrochemical Properties and Structural Stability of Overlithiated Li1 + x ( Ni1 ∕ 3Co1 ∕ 3Mn1 ∕ 3 ) 1 − x O2 Prepared by Spray-Drying Method
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DOI：
10.1149/1.2336988
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发表时间：
2006-11
影响因子：
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通讯作者：
Jung-Min Kim;N. Kumagai;H. Chung
中科院分区：
文献类型：
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作者：
Jung-Min Kim;N. Kumagai;H. Chung
研究了Li 1+x (Ni 1/3 Co 1/3 Mn 1/3 ) 1-x O 2 材料(0≤x≤0.17)的电化学性能和结构稳定性。使用喷雾干燥方法制备材料，调整Li/(Ni+Co+Mn)=0.95至1.5的摩尔比。所制备的材料在0≤x≤0.17范围内均呈现六方结构，并且材料的晶格参数随着x值的增加而逐渐减小。过锂化材料（x = 0.17）在第50次循环时的放电容量为179 mAh g -1 ，为初始容量的86%，而化学计量的放电容量保留了77%（141 mAh g -1 ）。从X射线衍射结果发现，过锂化提高了带电材料的结构稳定性，这有助于过锂化材料具有良好的电化学性能。
The electrochemical properties and structural stability of the Li 1+x (Ni 1/3 Co 1/3 Mn 1/3 ) 1-x O 2 materials (0 ≤ x ≤ 0.17) have been investigated. The materials were prepared using a spray-drying method with the adjusted molar ratios of Li/(Ni + Co + Mn) = from 0.95 to 1.5. The prepared materials exhibited a hexagonal structure in all the region of 0 ≤x ≤ 0.17 and the lattice parameters of the materials gradually decreased as the value of x increased. The discharge capacities of overlithiated material (x = 0.17) was 179 mAh g -1 at the 50th cycle which is 86% of the initial capacity, whereas the stoichiometric one preserved 77% (141 mAh g -1 ). From the X-ray diffraction results, it was found that the structural stability of charged material was improved by overlithiation, which could contribute to good electrochemical properties of overlithiated materials.