National key research and development program of "new energy vehicles" key project 2016 annual project "high energy-power lithium-ion battery development and industrialization of technology research" in high nickel cathode material research and development made a breakthrough.
In the first stage, the project R & D team solved the technical problem of low specific discharge capacity and low initial efficiency of high-nickel materials by combining basic formulation experiments. Combined with precursor controlled crystallization synthesis technology, secondary solid-phase synthesis technology with oxygen-enriched atmosphere and formulation adjustment , Coating technology and other key technologies to improve the oxidation of Ni2 + to Ni3 +, reduce the contact between the surface of the material and the electrolyte and reduce the amount of residual Li on the surface of the material. Without increasing the Ni content, the initial discharge capacity of the high- ≥206mAh / g, the first effect ≥90%, tap density ≥2.1g / cm3, magnetic impurity content ≤40ppb, pH≤11.7, with a 20t / month pilot production line.
In the meantime, in view of the technical difficulties of the continuous gradient preparation of Ni, Co, Mn and the poor uniformity control of the three precursors, the project team used Ni, Co and Mn three solutions to prepare separately and precisely controlled the flow through the design program Into the reactor new ideas, design, production of 100 liters experimental device, the preparation of complete control procedures, the preparation process parameters are optimized to achieve the precursors of the three elements from the core to the shell by any curve continuous gradient distribution, which greatly reduced Due to the sudden change in the composition of the material in the volume effect, stress and other aspects of non-uniformity, reduce the particles in the charge and discharge microcracks, improve capacity retention. The method simultaneously improves batch homogeneity of the precursor, and the synthesized precursor is a secondary spherical structure, and the particle size and composition gradient distribution are controllable, and the tap density is higher than 1.8g / cm3.
The above results provide a good foundation for the development of high-capacity, long-life gradient high-nickel cathode materials for the composition and gradient design of high-nickel ternary materials.
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