The effect of a Co–Al mixed metal oxide coating on the elevated temperature performance of a LiMn2O4 cathode material

2009 ◽  
Vol 189 (2) ◽  
pp. 1147-1153 ◽  
Author(s):  
Zhanxu Yang ◽  
Wensheng Yang ◽  
David G. Evans ◽  
Yingying Zhao ◽  
Xun Wei
Keyword(s):  
Elevated Temperature ◽  
Metal Oxide ◽  
Cathode Material ◽  
Oxide Coating ◽  
Mixed Metal Oxide ◽  
Mixed Metal ◽  
Temperature Performance ◽  
Limn2o4 Cathode ◽  
Elevated Temperature Performance ◽  
Metal Oxide Coating

Study on Elevated-Temperature Performance of LiCo0.02Cr0.02Mn1.96O4 by Surface Modification

2011 ◽  
Vol 415-417 ◽  
pp. 14-18
Author(s):  
Xing He Lu ◽  
Dong Han ◽  
Guang Qing Zhang ◽  
Nan Ma ◽  
Si Fei Liu
Keyword(s):  
Surface Modification ◽  
Elevated Temperature ◽  
Cathode Material ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Cycle Performance ◽  
X Ray Diffraction ◽  
Temperature Performance ◽  
Elevated Temperature Performance ◽  
Discharge Curves

The elevated-temperature performance of LiCo0.02Cr0.02Mn1.96O4cathode material, by SiO2-Al2O3surface modification, has been studied. The cathode material was been deal with SiO2-Al2O3, and then heated on certain temperature to get rid of organic material. The material structures that been modified (unmodified) were characterized by XRD, SEM and SpectraPlus. X-ray diffraction shows that all the samples have perfect spinel structure. The cycle stability of charge & discharge has been improved at 55°C. The results of the charge/discharge curves shows that the modified cathode materials have better performance than those unmodified, according to the inhibition of decline of reversible capacity of spinel LiCo0.02Cr0.02Mn1.96O4.Therefore, cycle performance has improved so obviously that 87.92% of the initial capacity were preserved respectively after 100 cycles. As cathode material of Lithium-ion battery, the modified spinel material is one of the most competitive substitutes for LiCoO2.

Enhanced Electrochemical Properties of LiFePO4/C Cathode Material by Metal Oxide Coating

2011 ◽  
Vol 347-353 ◽  
pp. 3443-3447 ◽  
Author(s):  
Li Wang ◽  
Xiao Fei Jie ◽  
Guang Chuan Liang ◽  
Xiu Qin Ou
Keyword(s):  
Metal Oxide ◽  
Cathode Material ◽  
Electrochemical Properties ◽  
Oxide Coating ◽  
High Rate ◽  
Constant Current ◽  
Precipitation Method ◽  
Uncoated Sample ◽  
Capacity Degradation ◽  
Metal Oxide Coating

LiFePO4/C composite cathode material prepared by carbothermal reduction method was coated by metal oxide MnO2, Al2O3, CuO, respectively, by a chemical precipitation method. The effects of metal oxide coating on the structure and electrochemical performance of LiFePO4/C composites were systematically investigated. The structure and morphology of the samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), and the electrochemical properties were evaluated by constant-current charge/discharge cycling tests. It is found that the coating of metal oxide could greatly improve its high-rate dischargeability and cycling performance. The LiFePO4/C cathode material coated by MnO2 exhibits a specific discharge capacity of 118.5 mAh/g at 3C rate, much higher than the uncoated sample (95.1 mAh/g), with a capacity degradation rate of only 6.3 % after 250 cycles at 3C rate.

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