Preparation method of composite negative material of lithium-ion battery

A technology for lithium-ion batteries and negative electrode materials, which can be applied to battery electrodes, circuits, electrical components, etc., and can solve problems affecting the development and market prospects of lithium-ion batteries.

Inactive Publication Date: 2013-09-18
郑玉林
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the cycle performance of current lithium-ion batteries still needs to b...

Method used

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[0013] The following will clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0014] The embodiment of the present invention discloses a preparation method of a lithium-ion battery composite negative electrode material, comprising:

[0015] (1) Add nickel chloride solution and potassium hydroxide to the buffer solution at the same time, adjust the pH value to 10 with potassium hydroxide solution, and stir for 30 minutes;

[0016] (2) Filter the stirred solution and adjust the pH value to 7;

[0017] (3) Wash the neutral solution in step (2) with absolute alcohol, heat and dry for 250-300 minu...

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Abstract

The invention provides a preparation method of a composite negative material of a lithium-ion battery. The preparation method comprises the following steps of: (1) simultaneously adding a nickel chloride solution and potassium hydroxide into a buffer solution, adjusting the PH value of the mixed solution to be 10 by a potassium hydroxide solution, and stirring the solution for 30min; (2) filtering the stirred solution, and adjusting the pH value of the solution to be 7; (3) washing the neutral solution in the step (2) by anhydrous alcohol, and heating and drying the washed solution for 250min to 300min to obtain potassium hydroxide powder; (4) calcining the potassium hydroxide powder in air at a high temperature to obtain potassium oxide powder; and (5) dissolving the potassium oxide powder and hydrated cobalt chloride in water, adding sodium borate to be stirred for 30min, filtering the obtained solution to remove chlorine ions, drying for 5h to obtain the nickel chloride cobalt composite negative material, The composite negative material prepared through the method has high reversible specific capacity and good cyclic charging-discharging performance.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery composite negative electrode material. Background technique [0002] Lithium-ion batteries have been widely used in many electronic products, because of their small size and no charge-discharge memory effect, they are widely welcomed by the market. However, the cycle performance of current lithium-ion batteries still needs to be improved, which affects the development and market prospects of lithium-ion batteries. Contents of the invention [0003] The technical problem mainly solved by the invention is that the cycle performance of the current lithium ion battery still needs to be improved. [0004] In order to solve the above technical problems, the embodiment of the present invention discloses a preparation method of a lithium-ion battery composite negative electrode material, including: [0005] (1) Add nickel chloride solution and potassium hydroxide to the buffer solution ...

Claims

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Application Information

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IPC IPC(8): H01M4/52
CPCY02E60/10
Inventor 龚伟华
Owner 郑玉林
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