A kind of silicon negative electrode lithium-ion battery and manufacturing method thereof

A lithium-ion battery and manufacturing method technology, applied in electrolyte battery manufacturing, battery electrodes, secondary batteries, etc., can solve problems such as low specific capacity and short cycle life, and achieve high battery energy density, excellent charge-discharge performance, and low price. low cost effect

Active Publication Date: 2016-06-15
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the cycle life is short and the specific capacity is low

Method used

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  • A kind of silicon negative electrode lithium-ion battery and manufacturing method thereof
  • A kind of silicon negative electrode lithium-ion battery and manufacturing method thereof
  • A kind of silicon negative electrode lithium-ion battery and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A lithium-ion battery with a silicon negative electrode, comprising a positive electrode, a negative electrode, and a separator located between the positive and negative electrodes. The lithium-ion battery with a silicon negative electrode has a laminated structure. The negative electrode is composed of a current collector, an active material, a conductive agent, and a binder. The active material is a silicon-carbon composite material coated with a carbon layer, and the carbon layer is formed by pyrolysis of glucose or sucrose. The active substance is prepared through the following steps:

[0032] Step a) Ball milling: 1500g natural graphite powder and 500g silicon powder with a particle size of 40 microns are mechanically high-energy ball milled in an argon atmosphere for 8 hours at a speed of 100 rpm to prepare a silicon-carbon composite material. Among them, the natural graphite powder is compacted The density is 0.96g / c㎡;

[0033] Step b) Dissolving and stirring: Dissol...

Embodiment 2

[0040] A lithium ion battery with a silicon negative electrode, comprising a positive electrode, a negative electrode, and a separator between the positive and negative electrodes. The lithium-ion battery with a silicon negative electrode has a laminated structure. The negative electrode is composed of a current collector, an active material, a conductive agent and a binder. The active material is a silicon-carbon composite material coated with a carbon layer, and the carbon layer is formed by pyrolysis of glucose or sucrose.

[0041] The active substance is prepared through the following steps:

[0042] Step a) Ball milling: 2500g natural graphite powder and 500g silicon powder with a particle size of 50 microns are mechanically high-energy ball milled in an argon atmosphere for 8-10 hours at a speed of 400 rpm to obtain a silicon-carbon composite material. The tap density is 0.96g / c㎡;

[0043] Step b) Dissolving and stirring: Dissolve 400g of glucose in 3000g of distilled water, a...

Embodiment 3

[0049] A lithium ion battery with a silicon negative electrode, comprising a positive electrode, a negative electrode, and a separator between the positive and negative electrodes. The lithium-ion battery with a silicon negative electrode has a laminated structure. The negative electrode is composed of a current collector, an active material, a conductive agent and a binder. The active material is a silicon-carbon composite material coated with a carbon layer, and the carbon layer is formed by pyrolysis of glucose or sucrose. The active substance is prepared through the following steps:

[0050] Step a) Ball milling: 4,500 natural graphite powder and 500g silicon powder with a particle size of 30 microns are mechanically high-energy ball milled in an argon atmosphere for 10 hours to obtain a silicon-carbon composite material, wherein the tap density of the natural graphite powder is 0.96g / c㎡;

[0051] Step b) Dissolving and stirring: Dissolve 500g of sucrose in 5000g of distilled...

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Abstract

The invention relates to a silicon negative electrode lithium ion battery with high specific capacity and good cycle performance and a manufacturing method thereof. It includes a positive electrode, a negative electrode, and a diaphragm between the positive and negative electrodes. The silicon negative electrode lithium-ion battery is a laminated structure. The negative electrode includes a current collector, an active material, a conductive agent, and a binder. The active material is carbon Layer-coated silicon-carbon composites. Using the silicon-carbon composite material of the invention as the negative electrode has the advantages of high battery energy density, safety and reliability, and low price compared with the graphite negative electrode material; and the charging and discharging performance is excellent.

Description

Technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a silicon negative electrode lithium ion battery and a manufacturing method. Background technique [0002] With the rapid development of electric vehicles and hybrid electric vehicles, there is a demand for power-type lithium-ion batteries with higher power density and energy density, suitable for rapid charge and discharge, and energy-type lithium-ion batteries with longer battery life Very urgent. The main idea of ​​developing lithium-ion batteries that meet the above requirements is to find new positive and negative materials, so that the battery has higher lithium insertion capacity and good lithium reversibility, so as to ensure the battery's high voltage, large capacity and long cycle life. . The current commercial lithium-ion battery negative electrode uses graphite-based materials, which have the advantages of preventing lithium dendrites and small volume changes during ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M4/38H01M4/587H01M10/058
CPCY02E60/10Y02P70/50
Inventor 石先兴赵勇葛民民
Owner WANXIANG 123 CO LTD
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