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Method for improving electrochemical performance of lithium battery positive electrode coating material

A coating material and cathode material technology, applied in the field of lithium ion battery cathode material preparation, can solve problems such as affecting battery specific capacity, affecting lithium ion transmission, losing protection effect, etc., to improve cycle life, improve charge and discharge efficiency, reduce The effect of energy consumption

Inactive Publication Date: 2019-08-27
启东启澳新材料科技发展有限公司
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  • Application Information

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Problems solved by technology

However, the above-mentioned common coating materials have the following problems: most of them are insulators with poor conductivity, which affect the transmission of lithium ions, thereby affecting the specific capacity of the battery to a certain extent; there is a lattice mismatch between the coating and the positive electrode material, so After a certain number of cycles, it will gradually lose its protective effect

Method used

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  • Method for improving electrochemical performance of lithium battery positive electrode coating material

Examples

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Embodiment 1

[0029] A preparation method of a conductively enhanced lanthanum titanate-coated lithium nickel manganese oxide positive electrode material, comprising the following steps:

[0030] (1) take by weighing lanthanum hydroxide and titanium tetrachloride by the mol ratio of 1:1;

[0031] (2) Dissolving lanthanum hydroxide and tetrabutyl titanate in triethylene glycol, heating to 60° C., and fully dissolving them to obtain a mixed solution A;

[0032] (3) Under the condition that the temperature of the mixed solution A is 60°C and the rotational speed of the mixer is 200r / min, mechanically stir for 30 minutes to obtain the mixed suspension B;

[0033] (4) Add ammonia water to the mixed suspension B at 60° C. under mechanical stirring at 300 r / min. The amount of ammonia water is 5 times the weight of lanthanum hydroxide.

[0034] (5) Continue stirring the mixed suspension in step (4) at 160° C. and 300 r / min for 4 hours to obtain a lanthanum titanate sol.

[0035] (6) According to ...

Embodiment 2

[0038] A preparation method containing a conductive zinc oxide coating nickel manganese oxide lithium positive electrode material, comprising the following steps:

[0039] (1) take sodium hydroxide and zinc acetate by the mol ratio of 1:1;

[0040] (2) Dissolving zinc acetate in methanol, heating to 60° C. to fully dissolve it, to obtain solution A; dissolving sodium hydroxide in methanol, stirring to obtain solution B;

[0041] (3) Under the condition that the temperature of the mixed solution A is 60°C and the rotational speed of the mixer is 200r / min, the solution B is slowly added to the solution A, and mechanically stirred for 30 minutes to obtain a zinc oxide sol;

[0042] (4) At room temperature, under the mechanical stirring condition of 200r / min, according to the concentration of zinc oxide sol, the powder of lithium nickel manganese oxide is weighed in the ratio of 0.5:9.5 by the molar ratio of zinc oxide: lithium nickel manganese oxide, and Add the powder to the so...

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Abstract

The invention discloses a method for improving electrochemical performance of a lithium battery positive electrode coating material; the method for preparing the lithium battery positive electrode coating material comprises the following steps of weighing a certain amount of metal salt and / or alkali formed by metal ions and hydroxyl ions, and mixing the metal salt and / or alkali into a certain amount of low-carbon alcohol, and carrying out heating and dissolving to obtain a solution A; under the condition of mechanical stirring, adding a precipitant into the solution A, so that mixed latex is obtained; enabling the mixed sol obtained in the step (2) to be continuously stirred to obtain oxide sol; weighing a certain amount of positive electrode material powder, adding into the oxide sol obtained in the step (3), mixing under the mechanical stirring condition and standing, and washing the lower-layer precipitate, and drying to obtain the oxide coating-coated positive electrode material powder; and mixing the positive electrode material powder with a strong reducing agent, putting into a furnace, and carrying out heating and cooling to obtain a final product.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium-ion battery cathode materials, in particular to a method for improving the electrochemical performance of lithium-ion battery cathode coating materials. Background technique [0002] Lithium-ion batteries have outstanding advantages such as high voltage, high capacity, small size, light weight, environmental protection and long life, and have been widely used in various portable electronic products and electric vehicles. For the large-scale application of power lithium-ion batteries, the main challenge is how to further increase the energy density of batteries. In recent years, increasing the voltage of lithium-ion battery cathode materials is a new idea to improve the energy density of lithium-ion batteries in recent years. In the existing electrolyte system, the positive electrode material has the following problems to be solved urgently under high voltage conditions: 1. The posi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/48H01M4/483H01M4/624H01M10/0525H01M2004/028Y02E60/10
Inventor 张菊平
Owner 启东启澳新材料科技发展有限公司
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