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Preparation method of positive electrode material of lithium-ion battery

A lithium-ion battery and cathode material technology, applied in the field of new energy lithium battery cathode materials, can solve the problems of high process cost, thick particles, and inability to form single crystal nanosheets, and achieve the effect of improving performance and uniform size

Inactive Publication Date: 2016-12-07
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the main methods of synthesizing nanosheets mainly include co-precipitation method, hydrothermal method, ion exchange method, sol-gel method, etc. The particles synthesized by ordinary precipitation method are relatively thick and cannot form single crystal nanosheets; although hydrothermal method can Form single crystal nanosheets with excellent morphology, but the process cost is high

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  • Preparation method of positive electrode material of lithium-ion battery
  • Preparation method of positive electrode material of lithium-ion battery
  • Preparation method of positive electrode material of lithium-ion battery

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Embodiment 1

[0039] The preparation method of lithium ion battery cathode material described in this embodiment specifically comprises the following steps:

[0040] (1) Prepare a metal salt solution with a concentration of 2 mol / L with 50 mL of distilled water to obtain solution A, wherein the metal salt is a mixture of nickel sulfate, manganese sulfate and cobalt sulfate with a molar ratio of 5:2:3;

[0041] (2) Prepare a mixed solution of precipitant potassium hydroxide and complexing agent ammonia with distilled water to obtain solution B, the concentration of potassium hydroxide is 3mol / L, and the concentration of ammonia is 2mol / L;

[0042] (3) Pour 3g of surfactant into a reaction kettle filled with 300mL of distilled water, mix well, then add ammonia water dropwise to adjust the pH of the solution to 11, and obtain solution C, in which the surfactant is polyvinylpyrrolidone;

[0043] (4) According to the molar ratio of the metal cation in solution A and the precipitating agent in so...

Embodiment 2

[0049] The preparation method of lithium ion battery cathode material described in this embodiment specifically comprises the following steps:

[0050] (1) Prepare a metal salt solution with a concentration of 4 mol / L with 50 mL of distilled water to obtain solution A, wherein the metal salt is a mixture of nickel acetate, manganese nitrate and cobalt nitrate in a molar ratio of 5:1:4;

[0051] (2) Use distilled water to prepare a mixed solution of precipitant and complexing agent citric acid to obtain solution B. The precipitant is a mixture of 4 mol / L sodium hydroxide and 4 mol / L potassium hydroxide. The concentration is 1mol / L;

[0052] (3) Pour 3.5g of surfactant into a reaction kettle filled with 350mL of distilled water, mix well, then add ammonia water dropwise to adjust the pH of the solution to 12, and obtain solution C, in which the surfactant is dodecylbenzenesulfonate Sodium acid;

[0053] (4) According to the molar ratio of the metal cation in solution A and the...

Embodiment 3

[0059] The preparation method of lithium ion battery cathode material described in this embodiment specifically comprises the following steps:

[0060] (1) Prepare a metal salt solution with a concentration of 3 mol / L with 50 mL of distilled water to obtain solution A, wherein the metal salt is a mixture of nickel acetate, manganese acetate and cobalt acetate in a molar ratio of 5:3:2;

[0061] (2) Use distilled water to prepare a mixed solution of precipitant sodium hydroxide and complexing agent disodium edetate to obtain solution B, wherein the concentration of sodium hydroxide is 4mol / L, and the concentration of disodium edetate is The concentration is 0.2mol / L;

[0062] (3) Pour 2.5g of surfactant into a reaction kettle filled with 250mL of distilled water, mix well, then add ammonia water dropwise to adjust the pH of the solution to 10, and obtain C solution, in which the surfactant is oleylamine;

[0063] (4) According to the molar ratio of the metal cation in solution...

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Abstract

The invention discloses a preparation method of a positive electrode material of a lithium-ion battery. The method comprises the specific steps of dropwise adding a metal salt solution and a mixed solution of a precipitant and a complexing agent to a surfactant solution; controlling a pH value and a temperature under a synergistic effect of an inert atmosphere, ultrasonic cavitation and stirring dispersion until the metal salt solution is dropwise added; carrying out spray drying and roasting to obtain a spherical product, mixing the spherical product with a lithium source and roasting the mixture again to obtain the positive electrode material of the lithium-ion battery. The crystalline morphology can be effectively controlled by using a surfactant; the early synthesized material has an obvious sheet structure; particles agglomerated by a spray-dried product are uniform in size; a foundation is laid for later roasting to obtain the spherical particles with uniform sizes; and meanwhile, another foundation is laid for a relatively good morphology of the final product positive electrode material.

Description

technical field [0001] The invention relates to a method for preparing a positive electrode material of a lithium ion battery, belonging to the technical field of new energy lithium battery positive electrode materials. Background technique [0002] For lithium-ion batteries, the cathode material is the most important component and the most critical part that determines its electrochemical performance, so the performance of the cathode material greatly affects the performance of the lithium-ion battery, so it is prepared using a better preparation process Cathode materials are also very necessary. [0003] At present, the main methods of synthesizing nanosheets mainly include co-precipitation method, hydrothermal method, ion exchange method, sol-gel method, etc. The particles synthesized by ordinary precipitation method are relatively thick and cannot form single crystal nanosheets; although hydrothermal method can A single crystal nanosheet with excellent morphology is for...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/04H01M10/0525
CPCH01M4/0402H01M4/5825H01M10/0525Y02E60/10
Inventor 张正富吴天涯孙冬徐顺涛
Owner KUNMING UNIV OF SCI & TECH