Ammonia-free coprecipitation synthesis of a Ni–Co–Mn hydroxide precursor for high-performance battery cathode materials

The ammonia-free coprecipitation process using citric acid as a new chelating agent successfully produced a micro-sized spherical Ni_0.5Co_0.2Mn_0.3(OH)₂ precursor and a well-performed cathode active material LiNi_0.5Co_0.2Mn_0.3O₂ for Li-ion batteries.