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- 저자 : Yarger, J.L. (검색결과 1 건)
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Sin, B.C.,Singh, L.,Lee, K.E.,Kim, M.,Cho, M.,Yarger, J.L.,Woo, S.K.,Lee, H.i.,Lee, Y. Elsevier Sequoia 2015 Journal of Electroanalytical Chemistry Vol.756 No.-
A potential cathode material for lithium ion batteries has been developed using a boron polyanion substituted lithium iron manganese phosphate, LiFe<SUB>0.4</SUB>Mn<SUB>0.6</SUB>(PO<SUB>4</SUB>)<SUB>1-x</SUB>(BO<SUB>3</SUB>)<SUB>x</SUB> (x=0 to 0.03). Without any external carbon source, the material has been synthesized by solid-state reaction using ball-mill and was subsequently characterized by X-ray diffraction, scanning electron microscopy, electron energy loss spectroscopy, X-ray photoelectron spectroscopy, cyclic voltammetry, and galvanostatic charge-discharge measurement. The LiFe<SUB>0.4</SUB>Mn<SUB>0.6</SUB>(PO<SUB>4</SUB>)<SUB>1-x</SUB>(BO<SUB>3</SUB>)<SUB>x</SUB> samples show a single-phase crystalline nature with X-ray diffraction analysis, and enhanced discharge capacity at various C-rates as compared to that of pure LiFe<SUB>0.4</SUB>Mn<SUB>0.6</SUB>PO<SUB>4</SUB>. Among several LiFe<SUB>0.4</SUB>Mn<SUB>0.6</SUB>(PO<SUB>4</SUB>)<SUB>1-x</SUB>(BO<SUB>3</SUB>)<SUB>x</SUB> samples, LiFe<SUB>0.4</SUB>Mn<SUB>0.6</SUB>(PO<SUB>4</SUB>)<SUB>0.995</SUB>(BO<SUB>3</SUB>)<SUB>0.005</SUB> demonstrated the best cycleability, exhibiting an initial discharge capacity of 159.4mAhg<SUP>-1</SUP> at 0.1C and 113mAhg<SUP>-1</SUP> at 3C. LiFe<SUB>0.4</SUB>Mn<SUB>0.6</SUB>(PO<SUB>4</SUB>)<SUB>1-x</SUB>(BO<SUB>3</SUB>)<SUB>x</SUB> demonstrates enhanced electrochemical properties with excellent reversible cycling via boron polyanion substitution.
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