Structure and properties of high nickel LiNi0.834Co0.11Mn0.056O2 cathode material optimized by the coprecipitation method
[Purposes]In order to find the optimum synthesis conditions,the technological parameters of the high nickel precursor Ni0.834Co0.11Mn0.056(OH)2 in the coprecipitation processes were analyzed.Moreover,the effects on the properties of the corresponding cathodes were also been investigated.[Methods]The precursor and the corresponding cathode materials were synthesized at different ammonia concentrations and pH in the reaction solutions.In addition,the influence of the process parameters on the structural,micro-morphological and electrochemical properties was analyzed.[Findings]Under the conditions of the ammonia concentration of 1 1 g/L and the pH of 11.0,the prepared LiNi0.834Co0.11Mn0.056O2 cathode material possesses dense primary particles,high sphericity,and moderate particle size,delivering best electrochemical properties.The first specific discharge capacity at 0.1 C is 205.6 mAh/g and the Coulombic efficiency of the first cycle is 88.74％.Moreover,the specific discharge capacity is 150.7 mAh/g at the high current density of 10.0 C.Meanwhile,the capacity retention is still up to 80.18％after 300 cycles at 1.0 C.[Conclusions]The ammonia concentration and the pH of the reaction solution both alter the morphology,the particle size,and the composition of the precursor by affecting the solution oversaturation and thus influencing the nucleation and the growth of the crystal.The cathode material inherits the morphological characteristics of the corresponding precursors and its electrochemical properties are affected by the precursor synthesis process.
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