焙烧温度对锂离子电池正极材料Li2MnSiO4/C 电化学性能的影响

doi:10.3866/PKU.WHXB20111124

Abstract

Abstract: As a new potential cathode material for lithium ion batteries, Li₂MnSiO₄/C was synthesized by a solution method. The thermal behavior of the precursor for Li₂MnSiO₄/C was measured by thermogravimetric (TG) analysis and the range of calcination temperatures from 600 to 800°C was determined. X-ray powder diffraction (XRD) patterns indicated that all the Li₂MnSiO₄/C samples crystallized in an orthorhombic structure with space group Pmn2₁. The morphology and particle size of the samples were also characterized by scanning electron microscopy (SEM). The effects of calcination temperature on the electrochemical performance of Li₂MnSiO₄/C were studied using galvanostatic charge-discharge measurements at various current densities. The results showed that the sample prepared at 700°C exhibited a much higher coulombic efficiency and better cyclic performance than the other samples.

Key words: Lithium ion battery, Cathode material, Li₂MnSiO₄, Solution method, Calcination temperature

MSC2000:

O646

WEI Yi, WANG Li-Juan, YAN Ji, SHA Ou, TANG Zhi-Yuan, MA Li. Calcination Temperature Effects on the Electrochemical Performance of Li₂MnSiO₄/C Cathode Material for Lithium Ion Batteries[J].Acta Phys. -Chim. Sin., 2011, 27(11): 2587-2592.

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Calcination Temperature Effects on the Electrochemical Performance of Li₂MnSiO₄/C Cathode Material for Lithium Ion Batteries

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Calcination Temperature Effects on the Electrochemical Performance of Li2MnSiO4/C Cathode Material for Lithium Ion Batteries

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Calcination Temperature Effects on the Electrochemical Performance of Li₂MnSiO₄/C Cathode Material for Lithium Ion Batteries