LiMn_0.5Co_0.5BO₃ solid solution: Towards high performance cathode material for next-generation lithium-ion battery

다국어 초록 (Multilingual Abstract)

<P><B>Abstract</B></P> <P>LiMn<SUB>0.5</SUB>Co<SUB>0.5</SUB>BO<SUB>3</SUB> solid solution is synthesized by Sol-gel method. The crystal structure, morphology and the electrochemical properties of the LiMn<SUB>0.5</SUB>Co<SUB>0.5</SUB>BO<SUB>3</SUB> solid solution are analyzed. X-ray diffraction analysis result reveals the existence of monoclinic phase with <I>C</I>2/<I>c</I> space group. Raman spectroscopy result indicates the presence of Co-O and Mn-O stretching vibration. X–ray Photoelectron spectroscopy confirms the surface oxidation of Mn in the LiMn<SUB>0.5</SUB>Co<SUB>0.5</SUB>BO<SUB>3</SUB> solid solution. Transmission electron microscopy image shows the elongated spherical shaped particle with diameter of 40 nm. Galvanostatic charge – discharge studies indicate that the LiMn<SUB>0.5</SUB>Co<SUB>0.5</SUB>BO<SUB>3</SUB> solid solution delivers the first discharge capacity of 110 mAh g<SUP>−1</SUP> at C/10 rate with good stability and yield 68 mAh g<SUP>−1</SUP> at 75th cycle. The enhanced electrochemical properties demonstrated in this study will give more attention to borate based cathode material as a potential alternative to current lithium-ion battery cathodes.</P> <P><B>Highlights</B></P> <P> <UL> <LI> LiMn<SUB>0.5</SUB>Co<SUB>0.5</SUB>BO<SUB>3</SUB> solid solution is synthesized by sol gel technique. </LI> <LI> A high first discharge capacity of 110 mAh g<SUP>−1</SUP> is achieved for LiMn<SUB>0.5</SUB>Co<SUB>0.5</SUB>BO<SUB>3</SUB>. </LI> <LI> The first discharge capacity is at least 10 folds higher than previous reports. </LI> <LI> Co doping and Li rich stoichiometry has improved the electrochemical performance. </LI> </UL> </P>