High-capacity high-nickel positive material and power lithium battery monomer development breakthrough bottleneck

High-capacity high-nickel positive material and power lithium battery monomer development breakthrough bottleneck

Recently, from the official website of the Science and Technology Department, my country’s domestic battery R & D team has been designed and developed with a high-proportion of energy-powered lithium-ion batteries. It can double the motor vehicle mileage and greatly enhance the efficiency of the power lithium battery. Promote new energy vehicles to popularize and promote huge help.

It is understood that the R & D team solves the low-capacity of the high-nickel-based material discharge, the technical problem of the high-nickel-based material, and combined with precursor control crystalline synthesis technology, oxygen-rich atmosphere secondary solid phase synthesis technology, formula adjustment Wait for key technologies, increase Ni2 + oxidation into Ni3 + oxidation level, reduce material surface and electrolyte contact, reduce the amount of residual Li of the material, increase the first discharge capacity of the high nickel material to greater than or equal to 206mAH / g, the first effect is greater than or equal to 90%, the resonance density is greater than or equal to 2.1g / cm3, the magnetic impurity content is less than or equal to 40 ppb, the pH is less than or equal to 11.7.

At the same time, for the technical problems of the three elements of Ni, Co, Mn in the current precursor, the technical challenges for the preparation of uniformity, using Ni, Co, Mn three solutions, and the three solutions of Ni, Co, Mn are separately formulated, and the flow rate is accurately controlled through the design procedure to enter the reactor. New ideas, design, produce a 100-liter experimental device, prepare the control program, optimize the preparation process parameters, realize the three elements in the precursor, from the nuclear to the shell, continuous gradient distribution of any curve, greatly reduced due to component mutation The material caused by the material effect, stress, etc., reducing microcracks in the charging and discharge process, increasing capacity retention ratio.

The method also increases the batch unity of precursors, the synthetic precursor is the secondary spherical structure, the particle size and component gradient distribution can be controlled, the vibration density is higher than 1.8G / cm3. On this basis, the team utilizes high-performance nickel oxide-aluminum lithium (NCA) as a battery positive material, meets the energy density and safety requirements of power lithium battery, and is also used as a positive electrode material using nickel oxide-aluminum aluminum (NCA).

Based on, a high-specific energy, long cycle life, good safety performance lithium-ion powered lithium battery is developed, and a variety of nickel-based positive electrode materials is developed by nano-preparation, nano-dispersed, coating and pre-preparation. Silicone carbon negative electrode material having high capacity, high efficiency, cycle stability and magnification performance, and based on the system, the battery cell monomer is 302WH / kg, the volume energy density is 642Wh / L, 25 ¡ã C 1C charge and discharge cycle 710 times (100% DOD), the capacity retention rate reaches 80%; at the same time by optimizing the electrolytic solution formulation, the cycle performance is significantly improved, the current cycle 285 (100% DOD) capacity rendering is as high as 96%. This result is a scientific basis for the development of lithium-ion battery monomers than energy 300Wh / kg and 1500 cycle life.

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