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Negative electrode material of lithium ion battery and preparation method of lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of high manufacturing cost and limited source of raw materials, and achieve the effects of low price, improved cycle performance, and good conductivity

Active Publication Date: 2013-11-27
上海鑫忆丹新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a method for preparing negative electrode materials for lithium-ion batteries, which solves the problems of limited raw material sources and high manufacturing costs such as the need for ultra-high temperature calcination, and prepares a lithium-ion battery with good electrical conductivity by calcination at low temperature. A carbon material with good sex and good spatial structure, which is coated on the metal aluminum alloy foil to improve the cycle performance of the aluminum alloy foil

Method used

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  • Negative electrode material of lithium ion battery and preparation method of lithium ion battery
  • Negative electrode material of lithium ion battery and preparation method of lithium ion battery
  • Negative electrode material of lithium ion battery and preparation method of lithium ion battery

Examples

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Embodiment 1

[0040] Example 1: A lithium-ion battery negative electrode material and a preparation method of the lithium-ion battery, comprising the following steps:

[0041] a. Preparation of carbon material: Place polyacrylcyanide in a tube furnace at 600°C and calcinate for 4 hours under argon atmosphere to obtain carbon material;

[0042] b. Coated carbon material: mix the carbon material prepared in step (a) with polyvinylidene fluoride and conductive carbon in a mass ratio of 8:1:1, then add the solvent N,N dimethylacetamide for mixing, add the ingredients and The mass ratio of the solvent is 1:2, and the above four materials are mixed uniformly and then coated on the aluminum alloy foil with a coater on one side, as the negative electrode of the lithium-ion battery;

[0043] Among them, the mass fraction (content) of each component in the aluminum alloy foil is: 99.3% for Al, 0.3% for Fe, 0.3% for Si, 0.05% for copper, and 0.05% for Mn and other elements.

[0044] c. Prepare a...

Embodiment 2

[0046] Example 2: A lithium-ion battery negative electrode material and a preparation method of the lithium-ion battery, comprising the following steps:

[0047] a. Preparation of carbon material: mix polypropylene cyanide and elemental sulfur with a mass ratio of 1:2, place in a tube furnace at 600°C and calcinate for 4 hours under an argon atmosphere to obtain a carbon material;

[0048] b. Coated carbon material: mix the carbon material prepared in step (a) with polyvinylidene fluoride and conductive carbon in a mass ratio of 8:1:1, then add the solvent N,N dimethylacetamide, add the ingredients and solvent The mass ratio is 1:3, and the above four materials are mixed evenly and coated on one side of the aluminum foil with an applicator, as the negative electrode of the lithium-ion battery;

[0049] c. Prepare a simulated battery: use the coated carbon material obtained in step b as the cathode, metal lithium as the counter electrode, and a mixed solution of ethylene c...

Embodiment 3

[0051] Example 3: A lithium-ion battery negative electrode material and a preparation method of the lithium-ion battery, comprising the following steps:

[0052] a. Preparation of carbon materials: mix polypropylene cyanide and manganese dioxide in a mass ratio of 3:1, place them in a tube furnace at 600°C and calcinate for 4 hours under an argon atmosphere to obtain carbon materials;

[0053] b. Coated carbon material: mix the carbon material prepared in step (a) with polyvinylidene fluoride and conductive carbon in a mass ratio of 8:1:1, then add the solvent N,N dimethylacetamide, add the ingredients and solvent The mass ratio is 1:4, and the above four materials are mixed evenly and then coated on the aluminum foil with a spreader on both sides, as the negative electrode of the lithium-ion battery;

[0054] c. Prepare a simulated battery: use the coated carbon material obtained in step b as the cathode, metal lithium as the counter electrode, and a mixed solution of et...

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Abstract

The invention provides a negative electrode material consisting of a lithium ion battery formed by aluminum carbon and a preparation method of the lithium ion battery. The negative electrode material is provided with a 0.2-0.3 discharge potential platform for lithium, and the discharge capacity can reach 800-1,410mAh / g. Compared with the graphite preparation process, the preparation method of the negative electrode material of the lithium ion battery has the advantages that a super-high temperature calcination stage is omitted, so that the energy is obviously saved; the required various raw materials are wide in source and low in cost; the specific capacity of the negative electrode material prepared through the process method is obviously higher than that of the graphite carbon negative electrode material; the charge and discharge cycle performance of the material is good.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery negative electrode material and a preparation method for the lithium ion battery. [0002] Background technique [0003] With the widespread use of electric vehicles and portable mobile devices, there has been an increasing demand for high-capacity lithium-ion batteries in recent years. As an important part of lithium-ion batteries, negative electrode materials have great impact on the power density and energy density Improvement has an important impact, so the research on negative electrode materials is particularly important. As the most widely used secondary battery at present, lithium-ion battery has the advantages of high energy density, no memory effect, long cycle life and low pollution. Lithium-ion battery anode materials should meet the following conditions: [0004] 1. The lower oxidation-reduction potential when inserting and extracting lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/1393H01M4/133
CPCY02E60/122Y02E60/10
Inventor 朱伟汪佐龙牛凤光王章淦
Owner 上海鑫忆丹新材料有限公司
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