A study from the University of Queensland shows that special metal materials such as tungsten molybdenum (MO) can improve the electrochemical performance of cathode materials in lithium batteries, especially the cycle stability. With the increase of electric vehicle mileage, nickel needs to be added to improve the energy density, but it will also reduce the stability of the cycle. Tungsten molybdenum can improve stability by enhancing the structural stability and the resistance of the positive surface layer to the side reaction of the electrode/electrolyte.
Nickel cobalt manganese ternary oxide materials (NCMS) and nickel cobalt aluminum materials (NCAs) are considered ideal cathode materials for lithium-ion batteries (LIBS) because of their high energy density, good cycle performance, good safety performance, and relatively low cost.
It is found that molybdenum plays an important role in increasing the stability of cathode materials for lithium batteries. For NCM622, the researchers found that 0.7 mol percent Mo doping improved the cycle stability. At the voltage of 4.6V, the capacity of 1C is 203 mah-g-1, and the capacity retention rate of the Mo doped sample is higher than that of the original sample. A new research result is that the addition of Mo significantly inhibits the crushing of particles. The researchers further found that 1 mol percent Mo doping is the best level.
