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Lithium ion battery with silicon negative electrode and manufacturing method

A technology of lithium-ion batteries and manufacturing methods, applied in the direction of electrolyte storage battery manufacturing, battery electrodes, secondary batteries, etc., can solve the problems of low specific capacity, short cycle life, etc., and achieve high battery energy density, excellent charge and discharge performance, and low price cheap effect

Active Publication Date: 2013-10-30
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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  • Lithium ion battery with silicon negative electrode and manufacturing method
  • Lithium ion battery with silicon negative electrode and manufacturing method
  • Lithium ion battery with silicon negative electrode and manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A silicon negative electrode lithium-ion battery, comprising 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, and the negative electrode is composed of a current collector, an active material, a conductive agent and a bonding agent. The active substance 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 of natural graphite powder and 500g of silicon powder with a particle size of 40 microns were mechanically milled with high-energy ball in an argon atmosphere for 8 hours, and the ball milling speed was 100rpm to obtain a silicon-carbon composite material, wherein the vibration of the natural graphite powder The density is 0.96g / c㎡;

[0033] Step b) Dissolving ...

Embodiment 2

[0040] A silicon negative electrode lithium-ion battery, comprising 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, and the negative electrode is composed of a current collector, an active material, a conductive agent and a bonding agent. The active substance 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 of natural graphite powder and 500g of silicon powder with a particle size of 50 microns were mechanically milled for 8-10h in an argon atmosphere with a ball milling speed of 400rpm to obtain a silicon-carbon composite material, wherein the natural graphite powder The tap density is 0.96g / c㎡;

[0043] Step b) Dissolving and stirring: Dissolve 400g of ...

Embodiment 3

[0049] A silicon negative electrode lithium-ion battery, comprising 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, and the negative electrode is composed of a current collector, an active material, a conductive agent and a bonding agent. The active substance 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: 4500 g of natural graphite powder and 500 g of silicon powder with a particle size of 30 microns were mechanically milled for 10 h in an argon atmosphere to obtain a silicon-carbon composite material, wherein the tap density of the natural graphite powder was 0.96 g / c㎡;

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

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Abstract

The invention relates a lithium ion battery with a silicon negative electrode and with high specific capacity and good cycling performance and a manufacturing method. The lithium ion battery is of a laminated structure and comprises a positive electrode, the negative electrode and a diaphragm which is arranged between the positive electrode and the negative electrode, wherein the negative electrode comprises a current collector, an active substance, a conducting agent and adhesives, and the active substance is a silicon carbon composite material which is coated by a carbon layer. The silicon carbon composite material is used for producing the negative electrode, and compared with a lithium ion battery with a graphite negative electrode, the lithium ion battery with the silicon negative electrode has the advantages of high energy density, safety, reliability and low price. The charging and discharging performance of the lithium ion battery with the silicon negative electrode 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 thereof. Background technique [0002] With the rapid development of electric vehicles and hybrid electric vehicles, there is a demand for power lithium-ion batteries with higher power density and energy density, suitable for fast charging and discharging, and energy-type lithium-ion batteries with longer battery life very urgent. The main idea of ​​developing a lithium-ion battery that meets the above requirements is to find new positive and negative electrode materials, so that the battery has a higher lithium intercalation capacity and good delithiation reversibility, so as to ensure the high voltage, large capacity and long cycle life of the battery . The current commercial lithium-ion battery negative electrode uses graphite-based materials, which have the advantages of preventing lithium dendr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/38H01M4/587H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 石先兴赵勇葛民民
Owner WANXIANG 123 CO LTD
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