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Ternary cathode material and preparation method thereof

A technology of cathode materials and precursors, applied in the field of ternary cathode materials and their preparation, can solve the problems of increasing the production cost of ternary cathode materials, unpleasant smell, etc., and achieve good automatic dispersion effect, low cost and high reactivity Effect

Active Publication Date: 2022-07-19
宜宾锂宝新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when the spherical precursor is combined with the lithium source, the particle size of the lithium hydroxide used is relatively high, and the general lithium hydroxide is usually in the shape of a larger particle size, which needs to be refined before use. , this refinement process will produce a relatively unpleasant smell, even if there is no unpleasant smell, whether it is to purchase the refined lithium hydroxide or to refine the ternary cathode material by yourself before preparing the ternary cathode material, it will increase the production cost of the ternary cathode material

Method used

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  • Ternary cathode material and preparation method thereof
  • Ternary cathode material and preparation method thereof
  • Ternary cathode material and preparation method thereof

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preparation example Construction

[0040] The preparation method of the ternary positive electrode material provided in the embodiment of the present application includes:

[0041] The alkaline solution with hydroxide concentration ≥10mol / L and the precursor metal salt solution with concentration ≥2mol / L are based on the molar ratio of hydroxide in the alkaline solution to the metal ion in the precursor metal salt solution ≥ 2 Mixing, mixing and reacting for 2~60min, after the reaction is over, remove the moisture from the obtained precipitate to obtain a ternary precursor nano-powder.

[0042] The lithium hydroxide and the ternary precursor nano-powder are mixed for spheroidization, and the ternary precursor nano-powder is supported on the lithium hydroxide particles to obtain primary particle materials.

[0043] The primary particulate material is sintered.

[0044] A high concentration alkaline solution is used to react with a high concentration precursor metal salt solution, and the reaction time is contro...

Embodiment 1

[0070] The same volume of 20mol / L sodium hydroxide solution and 2.5mol / L nickel-cobalt-manganese sulfate mixed solution (molar ratio Ni / Co / Mn=5 / 2 / 3) were rapidly mixed at 60°C, and the mixed reaction was carried out. For 30 s, after the reaction is completed, the ternary precursor nano-powder is obtained by pressure filtration, washing and vacuum drying, wherein the drying temperature is 120°C.

[0071] The lithium hydroxide particles with D50=500 μm and the ternary precursor nano-powder obtained in the above steps are mixed according to Li / Me of 1, and placed in a fusion machine. The process parameters of the fusion machine during fusion are set as: feeding 50rpm / min ; mixing at 350 rpm / min for 5 min; fusion at 800 rpm / min for 20 min; intensive fusion at 1000 rpm / min for 3 min; discharging at 50 rpm / min to obtain a ternary cathode material.

Embodiment 2

[0073] The same volume of 4mol / L sodium carbonate solution and 2.5mol / L nickel-manganese sulfate mixed solution (molar ratio Ni / Mn=1 / 3) were rapidly mixed at 60°C, and the mixing reaction was carried out for 5 minutes. Pressure filtration, washing, and vacuum drying, wherein the drying temperature is 150° C. to obtain ternary precursor nano-powder.

[0074] The lithium hydroxide particles with D50=500 μm and the ternary precursor nano-powder obtained in the above steps are mixed according to Li / Me of 1, and placed in a fusion machine. The process parameters of the fusion machine during fusion are set as: feeding 50rpm / min ; Mixing 350 rpm / min, 5min; Fusion 800 rpm / min, 20min; Intensive fusion 1000 rpm / min, 3min; Discharge 50rpm / min. A ternary positive electrode material is obtained.

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Abstract

The invention relates to the technical field of lithium battery materials, and discloses a ternary positive electrode material and a preparation method thereof. The preparation method includes: mixing an alkaline solution with a concentration of ≥ 10 mol / L and a precursor metal salt solution with a concentration of ≥ 2 mol / L according to the molar ratio of hydroxide in the solution to the metal ion in the precursor metal salt ≥ 2, and the mixing reaction is 0.1 ~60min, after the reaction, remove the water from the obtained precipitate to obtain ternary precursor nano-powder; mix lithium hydroxide and ternary precursor nano-powder for spheroidization, and load the ternary precursor nano-powder in Primary particulate material is obtained on the lithium hydroxide particles; the primary particulate material is sintered. The method is simple, fast, and low in cost. There is no strict requirement for the particle size of lithium hydroxide, and there is no need to worry about the problem of precursor fragmentation; the nano-scale precursor has high reactivity, and the automatic dispersion effect of the lithium source and the precursor is good. The ternary positive electrode material is prepared by the above preparation method.

Description

technical field [0001] The invention relates to the technical field of lithium battery materials, in particular, to a ternary positive electrode material and a preparation method thereof. Background technique [0002] The production scale of ternary cathode materials is expanding, and a pricing model of "raw material cost + processing fee" is gradually formed in the market. For products with a certain element ratio, the prices of metals such as nickel, cobalt and lithium account for most of the production cost. In this case, through process innovation, the development of high-efficiency and low-cost production processes has direct significance for improving the market competitiveness of ternary cathode materials. [0003] In the existing ternary cathode materials, metals such as nickel, cobalt, and manganese are generally co-precipitated to form spherical precursors. In order to obtain a product that meets the target product size, it is often necessary to strictly control ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/052C01G53/00B82Y40/00B82Y30/00
CPCH01M4/505H01M4/525H01M10/052C01G53/44B82Y30/00B82Y40/00Y02E60/10
Inventor 范未峰张珏雷英王政强张郑
Owner 宜宾锂宝新材料有限公司
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