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Improved silicon-based negative electrode material for lithium ion battery

A technology of silicon-based negative electrode materials and lithium-ion batteries, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve problems such as poor stability, poor electrical conductivity, and limited energy density of lithium-ion batteries, achieving high stability, The effect of high capacity retention rate and easy mass production

Active Publication Date: 2019-12-24
GUANGDONG NEW LINGJIA NEW ENERGY LTD BY SHARELTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides an improved silicon-based negative electrode material for lithium-ion batteries, which solves the problems that existing materials limit the overall energy density, poor conductivity and poor stability of lithium-ion batteries

Method used

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  • Improved silicon-based negative electrode material for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] S1, preparation of binder: select 45 parts of gellan gum, and pour the gellan gum evenly into 29 parts of cold sodium hydroxide solution, use a stirring device to stir for 35 minutes, raise the temperature of the stirring device to room temperature, select 25 parts of chloroacetic acid and 30 parts of solvent, pour 25 parts of chloroacetic acid into 30 parts of solvent, stir to make 25 parts of chloroacetic acid dissolve in 30 parts of solvent to form a mixed solution, and slowly add the mixed solution three times to the previous The mixture was reacted at room temperature for 4.5 hours, and after rinsing with 25 parts of solvent for several times, the crude product was obtained. Finally, the crude product was dissolved in 10 parts of solvent, filtered to remove impurities, then dialyzed, and freeze-dried to obtain a binder;

[0037] S2, preparation of the mixture: select 65 parts of silicon nanowires, 30 parts of silicon dioxide and 30 parts of graphite, and pour the se...

Embodiment 2

[0041] S1. Preparation of binder: select 25 parts of gellan gum, and pour 25 parts of gellan gum evenly into 22 parts of cold sodium hydroxide solution, stir with a mixer for 30 minutes, and raise the temperature of the stirring device to room temperature , select 20 parts of chloroacetic acid and 25 parts of solvent, pour 20 parts of chloroacetic acid into 25 parts of solvent, stir slowly to make 20 parts of chloroacetic acid melt in 25 parts of solvent to form a mixed solution, and slowly drop the mixed solution three times Added to the previous mixture, reacted at room temperature for 4 hours, after washing with 25 parts of solvent for several times, the crude product was obtained, and finally the crude product was dissolved in 10 parts of solvent, filtered to remove impurities, then dialyzed and freeze-dried to obtain binder;

[0042] S2, preparation of the mixture: select 50 parts of silicon nanowires, 20 parts of silicon dioxide and 15 parts of graphite, and pour the sel...

Embodiment 3

[0046] S1. Preparation of binder: select 55 parts of gellan gum, and pour 55 parts of gellan gum evenly into 35 parts of cold sodium hydroxide solution, stir with a mixer for 30 minutes, and raise the temperature of the stirring device to room temperature , select 30 parts of chloroacetic acid and 40 parts of solvent, pour 30 parts of chloroacetic acid into 40 parts of solvent, stir slowly to make 30 parts of chloroacetic acid melt in 40 parts of solvent to form a mixed solution, and slowly drop the mixed solution three times Added to the previous mixture, reacted at room temperature for 5 hours, after washing with 20 parts of solvent for several times, the crude product was obtained, and finally the crude product was dissolved in 10 parts of solvent, filtered to remove impurities, then dialyzed and freeze-dried to obtain binder;

[0047] S2, preparation of the mixture: select 80 parts of silicon nanowires, 40 parts of silicon dioxide and 45 parts of graphite, and pour the sel...

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Abstract

The invention discloses an improved silicon-based negative electrode material for a lithium ion battery. The material comprises, by weight, 50 to 80 parts of silicon nanowire, 20 to 40 parts of silicon dioxide, 15 to 45 parts of graphite, 55 to 75 parts of deionized water, 20 to 30 parts of thickener, 35 to 45 parts of conductive agent, 30 to 50 parts of oxidant, 25 to 55 parts of gellan gum, 22 to 35 parts of sodium hydroxide solution, and 60 to 70 parts of solvent. The solvent includes water, an alcohol-water mixed solvent and organic acid or an alcohol solvent. The invention relates to thetechnical field of lithium ion battery materials. According to the improved silicon-based negative electrode material for the lithium ion battery, the acquired silicon-based negative electrode material for the lithium ion battery has the advantages of high stability and wider applicable temperature range, and is easy to be mass-produced; the prepared silicon-based negative electrode material for the lithium ion battery has a capacity of 885mAhg to 1 after 50 cycles under a current density of 0.5Ag to 1, and has the advantages of high capacity retention rate and low preparation process and equipment requirements; reaction does not need to be performed under harsh conditions such as high vacuum; and the material has the advantages low cost and being pollution-free and environment friendly.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials, in particular to an improved silicon-based negative electrode material for lithium-ion batteries. Background technique [0002] Lithium-ion battery: It is a secondary battery (rechargeable battery), which mainly relies on lithium ions to move between the positive electrode and the negative electrode to work. During the charging and discharging process, Li+ intercalates and deintercalates back and forth between the two electrodes: charging Li+ is deintercalated from the positive electrode and inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true when discharging. Lithium-based batteries are divided into lithium batteries and lithium-ion batteries. Lithium-ion batteries are used in mobile phones and laptops. Usually people Commonly known as lithium batteries, batteries generally use materials c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62H01M10/0525
CPCH01M4/364H01M4/386H01M4/48H01M4/62H01M10/0525H01M2004/027Y02E60/10
Inventor 丁安莉陈绍军丁波李春来安华萍
Owner GUANGDONG NEW LINGJIA NEW ENERGY LTD BY SHARELTD
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