Development of High Voltage Li1.0Ni0.5Mn1.5O4

摘要

Li[1.0]Ni[0.5]Mn[1.5]O[4] (LNMO) high voltage spinel is a very promising next generation battery cathode material. Among the most interesting features are the high operating voltage and the absence of cobalt, which enable an energy dense and cheap battery. The challenges are mainly related to the surface reactions involving electrolyte degradation and dissolution of nickel and manganese. Strategies to limit these unwanted degradation reactions often involve surface treatments and doping. This poster presents untreated LNMO material with superior electrochemical properties and gives insides from key methods that has been used in the development of the material. Among these are physical screening methods like XRD and SEM and electrochemical screening in half cell coin cells at 55 ℃ and subsequent confirmation of performance in full cells at 25 ℃. Our LNMO precursor is made by co-precipitation to obtain spherical particles with a controllable particle size distribution. The precursor is calcined with our proprietary calcination program that increases the density of the spherical particles and reduces the surface area to below 0.2 m2/g. The material has a high phase purity, high power capability, low degradation and low dissolution rate of manganese and nickel. A typical degradation value of an untreated LNMO is 5% per 100 cycles at 55℃ in half cells.