Preparation And Properties Of Spinel Oxide Anodes Materials For Lithium Ion Batteries

Rechargeable Li-ion batteries have been widely used in our daily life due to their chargeability,high energy density/capacity,convenient portability and environmentally friendly.At present,commercial Li-ion batteries using graphite as anodes have a low theoretical capacity of 372 mAh g^-1,and it has been difficult to meet the needs of modern electronic products.Since J-M Tarascon reported the high-capacity transition metal oxide anode material in 2000,the transition metal oxide material has attracted worldwide attentions.Cu_1.3Mn_1.7O₄ spinel oxide is synthesized by a facile sol-gel method.As the anode material,Cu_1.3Mn_1.7O₄ spinel oxide exhibits an initial capacity of 1221.1 mAh g^-1 and the specific capacity maintains at 608 mAh g^-1 after 100 cycles at the current density of 200mA g^-1.Compared with the nonaqueous binder,the aqueous binder can relieve the effect of volume expansion and reduce the electron transfer impedance,facilitating the cycling performance.Cu_1.3Mn_1.7O₄-graphene composites are obtained by the mechanical mixing method improving the electrochemical properties due to the increased conductivity of the graphene.Cu_1.3Mn_1.7O₄ spinel oxide with the core-shell structure is prepared by the hydrothermal method.The electrochemical test shows that the initial capacity is 1405.1mAh g^-1 and the specific capacity maintains at 730.5 mAh g^-1 after 50 cycles at the current of 200 mA g^-1.Mesoporous Cu_1.3Mn_1.7O₄ spinel oxide is synthesized by a template method.The specific capacity is 889.2 mAh g^-1 after 5 cycles at a current of 500 mA g^-1.Co₃O₄ 3D-nanowire as binder-free anode materials for Li-ion battery are directly grown on the nickel foam substrate using a facile hydrothermal method followed by a calcination process.The initial discharge capacity is 1283.0 mAh g^-1,and the reversible capacity is 813.9 mAh g^-1 at 0.5 C after 30 cycles.