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The Effect of K-Ion on the Electrochemical Performance of Spinel LiMn2O4
Lilong Xiong,Youlong Xu,Xiang Xiao,Jie Wang,Yutao Li 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.1
Spinel LiMn2O4 is regarded as one of the cathode active materials for rechargeablelithium-ion batteries with the most potential. K+-ion modified LiMn2O4 samples aresynthesized by solid-state reaction. The SEM analysis shows that the modifiedsamples exhibit uniform particle size distribution and much better crystallinity. Themodified sample K1 exhibits ionic diffusion coefficient of 1.43 × 10−10 cm−2 s−1 and2.04 × 10−10 cm−2 s−1, which is much higher than that of the un-modified spinelLiMn2O4 sample. The electrochemical measurements show that K+-ion modificationcould effectively reduce the charge transfer resistance, improve the capacityretention and rate capacity of the spinel materials.
The Effect of Na0.44MnO2 Formation in Na+-Modified Spinel LiMn2O4
Lilong Xiong,Youlong Xu,Weiguo Wu,Pei Lei,Tao Tao,Xin Dong 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.4
Na0.44MnO2 impure phase is formed during the synthetic process of Na+-modified spinel LiMn2O4 by solid state reaction which is confirmed by x-ray diffraction analysis. Scanning electron microscopy, transmission electron microscopy and galvanostatic charge-discharge measurements are carried out to investigate the effect of the formation of Na0.44MnO2 impurity on the morphology and electrochemical properties of the spinel material. The results show that the spinel material with impure phase exhibits improved cyclability compared to that of the pristine LiMn2O4. The improved electrochemical performance is mainly ascribed to the improved crystallinity of the spinel particles, enhanced stability of the spinel structure and good electronic conductivity of the composite.