Li rich Li1+xMn2-xO4(x=0.07) spinel powders were prepared by an oxalate precipitation of wet chemical methods at temperature lower than $600^{circ}C$. The FTIR results showed that the powders prepared at $600^{circ}C$ had high degree of crystal quality comparing with the spinel powders prepared by solid state reaction at 75$0^{circ}C$ which was the lowest synthesis temperature of the solid state reaction method. The particle size of powders prepared by the oxalate precipitation at $600^{circ}C$ was smaller than 0.2${mu}{ extrm}{m}$ and the specific surface area was 11.01 m2/g A heat treatment over 90$0^{circ}C$ formed second phase in the precipitates. It was shown that there were phase transitions at temperatures. T1,T2 and T2. The transitions involved weight loss and gain during heating and cooling. The low temperature synthesis below $600^{circ}C$ avoided the second phase formation and the prepared powders showed improved compositional and physical properties for secondary lithium battery applications.