Ternary cathode material and preparation method thereof, lithium ion battery and electric vehicle
A technology of positive electrode materials and elements, applied in the direction of battery electrodes, batteries, secondary batteries, etc., can solve the problems of low discharge capacity of ternary materials, poor thermal stability of high-nickel materials, and low compaction density, so as to improve capacity and heat dissipation. Stability, improvement of compaction density and upper voltage limit, and effect of suppressing phase transition
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[0031] The present invention also provides a preparation method of a ternary positive electrode material, comprising the following steps:
[0032] (1) The nickel source, the cobalt source and the manganese source are formulated into solution A in container A according to the stoichiometric ratio Ni: Co: Mn=a1: x1: y1, and the nickel source, the cobalt source and the manganese source are prepared according to the stoichiometric ratio Ni: Co: Mn = a2: x2: y2 is prepared into solution B in another container, wherein, 0.8≤a1a2 / (a2+x2+y2);
[0033] (2) Pump the solution A in the container A into the reaction container containing the alkali solution for co-precipitation reaction, and at the same time pump the solution B into the container A and stir to prepare the precursor material;
[0034] (3) mixing the precursor material obtained in step (2) with lithium salt, pre-sintering and pulverizing to obtain material A;
[0035] (4) Material A is mixed with a co-solvent, sintered and p...
Embodiment 1
[0063] (1) Co-precipitation method to prepare precursor materials
[0064]Nickel sulfate, cobalt sulfate and manganese sulfate are according to stoichiometric ratio (Ni: Co: Mn=9: 0.5: 0.5) in container A preparation 40L concentration is the solution A of 2.0mol / L, in another container nickel sulfate , cobalt sulfate, manganese sulfate according to the stoichiometric ratio (Ni: Co: Mn=6: 2: 2) to prepare 20L of solution B with a concentration of 2.0mol / L, and simultaneously prepare 3mol / L NaOH solution and 4mol / L ammonia solution Add an appropriate amount of deionized water, NaOH and ammonia solution in the reactor, and adjust the pH value to 11.5, pump the solution A in the container A into the reactor with a pump speed of 3L / h, and inject it into the reactor at the same time Prepared NaOH solution and ammonia solution to keep the pH value of the reaction solution at 11.5, and at the same time, pump solution B into container A at a pump speed of 1L / h and mix with solution A i...
Embodiment 2
[0071] (1) Co-precipitation method to prepare precursor materials
[0072] The method for preparing the precursor material is the same as in Example 1.
[0073] (2) Preparation of ternary cathode materials by solid phase sintering method
[0074] Mole ratio Li:Ni 0.8 co 0.1 mn 0.1 (OH) 2 =1.20:1 ratio lithium carbonate and lithium fluoride (based on the total weight of the lithium salt, LiF content is 5wt%) and the prepared precursor material are mixed in a mixer, and the uniformly mixed material is transferred to a horse Roasting in a Furnace, the heating rate is 5°C / min, the sintering temperature is 600°C, and the sintering time is 10h; after cooling with the furnace, the material is ground and crushed and passed through a 300-mesh sieve to screen out large irregular particles to obtain material A .
[0075] Mix the co-solvent KCl and material A in the mixer according to the mass ratio KCl:A=2:1, and then transfer to the muffle furnace to continue roasting, the heating...
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