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Negative electrode of lithium ion battery, and lithium ion battery

A lithium-ion battery and negative electrode technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of long batching time and complex negative electrode process, and achieve the effect of increasing energy density and shortening batching time

Inactive Publication Date: 2013-01-02
SHENZHEN MEIBAI ELECTRONIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The negative electrode process of the existing lithium-ion battery is relatively complicated, and the batching time is long, so there is a need for further improvement

Method used

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  • Negative electrode of lithium ion battery, and lithium ion battery
  • Negative electrode of lithium ion battery, and lithium ion battery
  • Negative electrode of lithium ion battery, and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0040] The preparation steps of the negative electrode of lithium ion battery are:

[0041] (1) After the slurry passes through a 100-150 mesh screen, it is coated on the substrate with a coating machine and the coated film is dried to obtain a coated membrane. The density of the coated surface is 8.77±0.35mg / cm 2 ;

[0042] (2) The coated diaphragm is rolled with a pair of rollers, and the thickness of the diaphragm after rolling is controlled to 115±5μm;

[0043] (3) The rolled film is cut into small pieces of 459mm*43mm by cutting machine and slitting machine;

[0044] (4) Use a super welding machine to weld a nickel strip on the exposed foil area of ​​the small chip head. The size of the nickel strip is: 40.5mm*3.0mm*0.1mm (length*width*thickness);

[0045] (5) Paste protective adhesive tape on the welded part to obtain the finished negative electrode of the lithium-ion battery.

Embodiment 1

[0047] Example 1: The negative electrode aqueous formula includes the following effective solid components, each effective solid component weight percentage is: negative electrode active material 51.83%, polyacrylonitrile type water-based conductive adhesive 1.62%, conductive agent 0.54%. In addition, the new high-performance negative electrode water-based formula also includes the following liquid components, the weight percentage of each liquid component is: deionized water 45.99%, N-methylpyrrolidone 0.01%, ethanol (defoamer) 0.01%.

[0048] Negative electrode slurry configuration method according to the present invention:

[0049] (1) Add deionized water and polyacrylonitrile-based water-based conductive adhesive (in no particular order) into the mixer, and stir for 5 minutes without vacuuming (revolution 20HZ, rotation 10HZ);

[0050] (2) Add conductive graphite, stir for 5 minutes without vacuuming, then vacuumize (vacuum degree -60KPa) and stir for 30 minutes (revolutio...

Embodiment 2

[0060] Example 2: The negative electrode aqueous formula includes the following effective solid components, each effective solid component weight percentage is: negative electrode active material 50.18%, polyacrylonitrile type water-based conductive adhesive 1.30%, conductive agent 0.53%. In addition, the new high-performance negative electrode water-based formula also includes the following liquid components, the weight percentage of each liquid component is: deionized water 45.74%, N-methylpyrrolidone 1.51%, isopropanol (defoamer) 0.74% (concentration ≥40%).

[0061] Negative electrode slurry configuration method according to the present invention:

[0062] (1) Add deionized water and polyacrylonitrile-based water-based conductive adhesive (in no particular order) to the mixer, vacuumize (vacuum degree -50KPa) and stir for 20min (revolution 30HZ, rotation 20HZ);

[0063] (2) Add conductive graphite, stir without vacuuming for 8 minutes, then vacuumize (vacuum degree -50KPa)...

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Abstract

The invention relates to the technical field of lithium batteries, and in particular to a negative electrode of lithium ion battery, and a lithium ion battery. The copper foil or the aluminum foil is used as the substrate, the substrate is coated by slurry and prepared into the negative electrode end product of the lithium ion battery, and the slurry is a novel high-performance negative electrode aqueous formula comprising effective solid components and liquid components; the formula comprises the following effective solid components by weight percent: 47.04%-56.26% of negative electrode active substance, 0.98%-1.74% of polyacrylonitrile type aqueous conductive adhesive and 0.24%-0.86% of conductive agent, wherein the negative electrode active substance is graphite; and the liquid components comprise 36.36%-51.01% of deionized water, 0.01%-2.81% of N-methyl pyrrolidinone and 0.01%-2.81% of defoamer. According to the negative electrode of lithium ion battery and the lithium ion battery provided by the invention, the energy density, the rate capability and the cycle performance of the lithium ion battery can be improved obviously, and the time for preparing materials also can be reduced.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a negative electrode of the lithium ion battery and the lithium ion battery. Background technique [0002] With the use of Mobile Internet Devices (MID) such as mobile phones and notebook computers, the promotion of Electric Vehicles such as electric bicycles and electric motorcycles, and the development of aerospace technologies such as drones and space probes, the current Lithium-ion batteries, which are widely used in these aspects, have put forward higher and higher performance requirements. A breakthrough in the performance of the negative electrode is one of the effective methods to improve the overall performance of lithium-ion batteries, and the negative electrode formulation determines the performance of the negative electrode, which makes the high-performance negative electrode formulation a research hotspot. [0003] According to the "2012-2015 China Lit...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M10/0525H01M4/1393
CPCY02E60/122Y02E60/10
Inventor 汪国红魏思伟
Owner SHENZHEN MEIBAI ELECTRONIC CO LTD
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