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Preparation method of nickel-cobalt lithium manganate anode material through hydro-thermal synthesis

A technology of nickel-cobalt lithium manganese oxide and positive electrode materials, which is applied in the direction of battery electrodes, electrical components, circuits, etc., can solve the problems of affecting the service life of lithium batteries, residual alkaline compounds, and partial mixing of lithium source waste, so as to avoid waste Effects of local uneven mixing, reduction of basic compounds, and shortening of sintering time

Inactive Publication Date: 2018-02-23
重庆特瑞新能源材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Another patent application number CN201310020961.4 describes a method for preparing an alumina-coated modified lithium-nickel-cobalt-manganese-oxygen positive electrode material. The precursor and the doped ion salt solution are dispersed in deionized water, and then roasted and mixed with Lithium salts are mixed and sintered to obtain products, but there is a waste of lithium sources and insufficient local mixing.
[0005] In summary, the existing nickel-cobalt lithium manganese oxide positive electrode material has crystal defects caused by multiple sintering, and the stirring and mixing caused the waste of lithium source and the lack of local uneven mixing. In addition, the alkali on the surface of the positive electrode material Excessive residues of reactive compounds further affect the service life of lithium batteries

Method used

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  • Preparation method of nickel-cobalt lithium manganate anode material through hydro-thermal synthesis
  • Preparation method of nickel-cobalt lithium manganate anode material through hydro-thermal synthesis
  • Preparation method of nickel-cobalt lithium manganate anode material through hydro-thermal synthesis

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Embodiment 1

[0027] S1, make nickel sulfate 11.62Kg, cobalt sulfate 4.48Kg, manganese sulfate 2.38Kg according to Ni:Mn:Co molar ratio 6:2:2 to prepare 2mol / L sulfate solution, take aluminum nitrate 0.063Kg to dissolve and add the above-mentioned salt Mixed salt solution A is formed in the solution; the concentration of sodium hydroxide and ammonia water is respectively prepared as mixed alkali solution B of 3.0mol / L and 0.45mol / L;

[0028] S2, the prepared mixed salt solution A and the mixed alkali solution B are pumped into the reactor at the same time, the flow of the alkali solution B is controlled so that the pH of the mixed reaction solution in the reactor is 10.8±0.2, and the stirring speed of the mixed solution in the reactor is 200 rpm, the reaction temperature is 65°C, after the co-precipitation reaction is completed, the obtained precipitate is washed, filtered and dried to obtain a doped nickel-cobalt-manganese ternary precursor;

[0029] S3, uniformly mix the nickel-cobalt-man...

Embodiment 2

[0032] S1, 11.62Kg of nickel sulfate, 4.48Kg of cobalt sulfate, and 2.38Kg of manganese sulfate are prepared into a 2mol / L sulfate solution according to the molar ratio of Ni:Mn:Co 6:2:2. After dissolving 0.063Kg of aluminum nitrate, add the above Mixed salt solution A is formed in the salt solution; the concentration of preparing sodium hydroxide and ammonia water is respectively 3.0mol / L and 0.45mol / L mixed alkali solution B;

[0033] S2, the prepared mixed salt solution A and mixed alkali solution B are pumped into the reaction kettle at the same time, the flow of alkali solution B is controlled so that the pH of the mixed reaction solution in the reaction kettle is 11.2±0.2, and the stirring speed of the mixed solution in the reaction kettle is 400 rpm, the reaction temperature is 50°C, after the co-precipitation reaction is completed, the obtained precipitate is washed, filtered and dried to obtain a doped nickel-cobalt-manganese ternary precursor;

[0034] S3, uniformly ...

Embodiment 3

[0037] S1, make nickel sulfate 11.62Kg, cobalt sulfate 4.48Kg, manganese sulfate 2.38Kg according to Ni:Mn:Co molar ratio 6:2:2 to prepare 2mol / L sulfate solution, take aluminum nitrate 0.063Kg to dissolve and add the above-mentioned salt Mixed salt solution A is formed in the solution; the concentration of sodium hydroxide and ammonia water is respectively prepared as mixed alkali solution B of 3.0mol / L and 0.45mol / L;

[0038] S2, the prepared mixed salt solution A and mixed alkali solution B are pumped into the reaction kettle at the same time, the flow of alkali solution B is controlled so that the pH of the mixed reaction solution in the reaction kettle is 11.2±0.2, and the stirring speed of the mixed solution in the reaction kettle is 400 rpm, the reaction temperature is 55°C, after the co-precipitation reaction is completed, the obtained precipitate is washed, filtered and dried to obtain a doped nickel-cobalt-manganese ternary precursor;

[0039] S3, uniformly mix the nic...

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Abstract

The invention discloses a preparation method of a nickel-cobalt nickel-cobalt lithium manganate anode material through hydro-thermal synthesis. In the process of adding a lithium source, a nickel-cobalt precursor and the lithium source are synthesized after subjected to a reaction for 20-30 h at 160-250 DEG C through adoption of a hydro-thermal method; the obtained materials are dried, crushed andthen placed in a muffle furnace for sintering for 6-16 h at 700-980 DEG C to obtain the nickel-cobalt lithium manganate anode material. The preparation method has the following advantages that through the hydro-thermal synthesis, low-temperature crystallization of the precursor and the lithium source is achieved, and the phenomena can be avoided that during stirring and blending, the lithium source is wasted, and a part of the lithium source is not blended evenly; the internal crystals of the material prepared through the hydro-thermal synthesis have few defects, influence factors of materialcrystalline due to temperature control are reduced during sintering, the calcination temperature of the material is decreased, the calcination time of the material is shortened, and the cost is saved; the anode material prepared according to the preparation method has higher discharging capacity and more excellent circulation performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, and specifically designs a preparation method for hydrothermally synthesizing nickel-cobalt lithium manganese oxide cathode material. Background technique [0002] Lithium-ion batteries have been widely used in small electronic products, energy vehicles and other fields because of their high energy density, long cycle life, light weight, small self-discharge and environmental friendliness. At present, the positive electrode of lithium-ion batteries is mainly nickel-cobalt lithium manganese oxide positive electrode material, and its production process is to produce precursors by co-precipitation method, which is mixed with lithium sources such as lithium carbonate at high speed, and then obtained by high-temperature solid-state sintering and crushing. [0003] Lithium-mixed sintering adopts high-speed stirring and mixing and then high-temperature sintering process. Due to the excessi...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525Y02E60/10
Inventor 安文雅高伟程冲邱晓微王海静
Owner 重庆特瑞新能源材料有限公司
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