Truncated octahedral LiMn2O4 cathode for high-performance lithium-ion batteries

• Published in: Materials chemistry and physics Vol. 158; pp. 138 - 143
• Main Authors: Hwang, Bo-Mi, Kim, Si-Jin, Lee, Young-Woo, Park, Han-Chul, Kim, Da-Mi, Park, Kyung-Won
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 05.05.2015
• Subjects: Chemical synthesis; Electrochemical properties; Nanostructures; Oxides; Oxides; Electrochemical properties; Nanostructures; Chemical synthesis
• ISSN: 0254-0584; 1879-3312
• DOI: 10.1016/j.matchemphys.2015.03.052

Spinel-type LiMn2O4 has been studied as a promising cathode candidate capable of replacing LiCoO2 in lithium-ion batteries. Here we demonstrate LiMn2O4 powders prepared by a calcination process as a function of temperature and time. LiMn2O4 structure electrode prepared at 700 °C for 10 h forms a truncated octahedral structure consisting of {111} and {100} surfaces. In particular, the truncated octahedral structure exhibits the crystal orientation toward dominant {111} surfaces of octahedral structure to minimize Mn dissolution and a particular portion of {100} surfaces of the truncated structure to stabilize the electrode. The truncated octahedral structure shows excellent discharge capacity (∼132.14 mAh g−1 at 1 C), high capacity retention (∼100%) and durable cycling performance (after 100 cycle) compared to the octahedral shaped electrodes. In particular, the truncated octahedral structure of LMO-700-10h exhibits the crystal orientation toward majority {111} surfaces of octahedral structure and minority {100} surfaces. •LiMn2O4 nanostructure materials were prepared for Li-ion batteries.•LiMn2O4 nanostructure materials were controlled by calcination temperatures.•The truncated octahedral nanostructure consists of {111} and {100} surfaces.•The truncated octahedral structure shows an excellent performance.