Negative plate used for lithium ion battery and preparation method thereof

A lithium-ion battery and negative electrode technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems such as consumption, long process, and impact on battery performance, and achieve the effects of increasing battery capacity, excellent conductivity, and improving conductivity

Active Publication Date: 2015-11-25
微宏先进材料公司
View PDF6 Cites 21 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This traditional pole piece processing method has a long process and needs to consume solvent or dispersant, and the binder used in the current lithium-ion battery manufacturing process is a non-conductive organic polymer, such as fluorine-containing resin, Polyolefin compounds, styrene-butadiene rubber or carboxymethyl cellulose, etc., the introduction of binders not only reduces the content of active materials in the pole piece, reduces the battery capacity, but also reduces the electronic conductivity of the pole piece, affecting the performance of the battery
When non-water-soluble organic polymers such as fluorine-containing resins, polyolefin compounds, and styrene-butadiene rubber are used as adhesives, organic solvents must be selected, which may cause chemical reactions between solvents and active materials, and the problems of recycling solvents

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Negative plate used for lithium ion battery and preparation method thereof
  • Negative plate used for lithium ion battery and preparation method thereof
  • Negative plate used for lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Example 1: V 2 o 5 Positive electrode versus Li-Si-Cu integrated negative electrode

[0075] V 2 o 5 Preparation of positive electrode sheet: mixed positive electrode material V 2 o 5 (0.800g), conductive carbon black (0.100g), PVDF (0.100g) and NMP (2.00g) to prepare slurry, coated on aluminum foil to make pole piece (pole piece thickness 125μm), then dried, pole piece cut It is used as a 15mm disc, and compacted under 2.0MPa after slicing.

[0076] Negative electrode sheet preparation: weigh 0.0300g of Li in a glove box under an argon atmosphere 13 Si 4 Powder, 0.1200g of copper powder are evenly mixed and pressed into a mold with a diameter of 14.0mm (10.0MPa) to make a negative electrode sheet, and then mixed with V 2 o 5 The battery is assembled with the positive plate, and the test results of the battery are as follows: figure 1 And shown in Table 1.

[0077] Button battery charging and discharging data in table 1, embodiment 1.

[0078] ...

Embodiment 2

[0080] Example 2: V 2 o 5 Positive electrode to Li-Si-Cu integrated negative electrode:

[0081] V 2 o 5 Preparation of positive electrode sheet: mixed positive electrode material V 2 o 5 (0.800g), conductive carbon black (0.100g), PVDF (0.100g) and NMP (2.00g) to prepare slurry, coated on aluminum foil to make pole piece (pole piece thickness 125μm), then dried, pole piece cut It is used as a 15mm disc, and compacted under 2.0MPa after slicing.

[0082] Negative electrode sheet preparation: under an argon atmosphere in the glove box, weigh 0.0800g of Cu powder, 0.0100g of lithium powder, and 0.0100g of silicon powder and mix them evenly into a copper foam matrix with a diameter of 14mm. Negative sheet is made by pressing sheet (10.0MPa) in the mold, and then with V 2 o 5 The battery is assembled with the positive plate, and the test results of the battery are as follows: figure 2 and shown in Table 2.

[0083] Button battery charging and discharging data in t...

Embodiment 3

[0086] Example 3: V 2 o 5 Positive electrode to Li-Si-Cu integrated negative electrode:

[0087] V 2 o 5 Preparation of positive electrode sheet: mixed positive electrode material V 2 o 5 (0.800g), conductive carbon black (0.100g), PVDF (0.100g) and NMP (2.00g) to prepare slurry, coated on aluminum foil to make pole piece (pole piece thickness 125μm), then dried, pole piece cut It is used as a 15mm disc and compacted under 2.0MPa after the blade.

[0088] Negative electrode sheet preparation: weigh 0.0800g of Cu powder and 0.0200g of Li 13 Si 4 Mix the powder evenly and put it into a foamed copper matrix with a diameter of 14mm, and press it into a mold with a diameter of 14.0mm (10.0MPa) to make a negative electrode sheet, and then mix it with V 2 o 5 The battery is assembled with the positive plate, and the test results of the battery are as follows: image 3 and shown in Table 3.

[0089] Button battery charging and discharging data in table 3, embodiment 3...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to view more

Abstract

The invention provides an integrative negative plate used for a lithium ion battery. The integrative negative plate is prepared from negative electrode materials and metal powder, wherein the metal powder does not form alloy with metal lithium. The invention also provides a preparation method of the integrative negative plate and the lithium ion battery which contains the above integrative negative plate. The integrative negative plate has good comprehensive performance and excellent negative plate conductivity, and the specific energy density of the unit volume or the unit mass of the battery is greater than the specific energy density of a common lithium ion battery.

Description

technical field [0001] The invention relates to a negative electrode sheet for a lithium ion battery and a preparation method thereof. Background technique [0002] The negative electrode materials of lithium-ion batteries mainly include carbon materials, silicon materials, nitrogen-lithium compounds (lithium transition metal nitrides), metal oxides, intermetallic compounds and conductive organic polymers. At present, graphitized carbon materials are widely used commercially. This kind of material has good electrical conductivity, high crystallinity, and good layered structure, which is suitable for lithium intercalation-deintercalation to form lithium-graphite interlayer compounds. However, the charge-discharge specific capacity of such materials is not high, generally between 300-400mAh / g. Searching for non-carbon anode materials with high specific capacity is the current research focus of lithium-ion battery materials. Among them, elemental silicon is the most practica...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395
CPCY02E60/10
Inventor 周小平王卫涛郑卓群
Owner 微宏先进材料公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap