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Preparation method of battery positive plate, positive plate and lithium ionic cell

A lithium ion battery and a manufacturing method technology, which are applied to the production of a positive electrode sheet of a battery and the field of a positive electrode sheet produced and a lithium ion battery, can solve the problems that cannot be completely removed, affect the performance of the battery, the battery is bulging, etc., and achieve a good cycle. Features, small deformation, no pollution effect

Inactive Publication Date: 2008-04-16
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the water-based binder water containing PTFE becomes a mixed emulsion, the water in it cannot be completely removed when the pole piece is dried, causing the water to slowly dissolve with the electrolyte in the battery during the battery cycle. The reaction produces gas, which causes the battery to bulge and affects the performance of the battery
The SBR in the water-based binder will oxidize under high voltage, which will also affect the performance of the battery

Method used

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  • Preparation method of battery positive plate, positive plate and lithium ionic cell
  • Preparation method of battery positive plate, positive plate and lithium ionic cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh the average particle diameter D 50 9 micron cathode active material LiCoxNiyMnzO 2 96 grams, 0.96 grams of binder carboxymethylcellulose sodium (CMC-Na), 2.88 grams of conductive agent graphite, the graphite average particle diameter D 50 0.2 micron, resistivity 5×10 -5 Ohm·cm, specific surface area is 350 m2 / g. The above-mentioned sodium carboxymethylcellulose (CMC-Na) was added into 48 grams of deionized water, stirred and dissolved with a vacuum mixer for 0.5 hour, and the stirring speed was 500 rpm, so that the CMC-Na was completely dissolved in the deionized water.

[0022] After mixing the above-mentioned conductive agent and positive electrode active material into a dry mixture, add it to the prepared CMC-Na binder, and stir for 2 hours with a vacuum mixer at a stirring speed of 800 rpm to obtain a uniformly mixed slurry.

[0023] The obtained electrode material slurry is drawn and coated on the aluminum foil of the electrode collector with a thickness ...

Embodiment 2

[0025] Positive active material LiCoxNiyMnzO 2 96 grams, 2.88 grams of carboxymethylcellulose sodium (CMC-Na), 5.76 grams of conductive agent acetylene black, 57.6 grams of deionized water, adopt the method of embodiment 1 to make the battery positive electrode sheet.

Embodiment 3

[0027] Positive active material LiCoxNiyMnzO 2 98 grams, 1.96 grams of carboxymethylcellulose sodium (CMC-Na), 0.98 grams of conductive agent carbon black, 49 grams of deionized water, adopt the method of embodiment 1 to make the battery positive electrode sheet.

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Abstract

The present invention relates to a method for preparing a lithium-ion battery positive plate, comprising the following procedures: a caking agent is added into the water for dissolution; then an anode active substance is added to the prepared caking agent to mix and prepare a sizing agent; the prepared sizing agent is coated on a collecting fluid; then the lithium-ion battery positive plate is achieved through baking, preforming and slitting; the caking agent is chose from one kind or a plurality of kinds of sodium carboxymethyl cellulose, methylcellulose, hydroxypropyl methylcellulose, carboxymethyl hydroxyethyl cellulose or hydroxypropyl cellulose; the dosage of the caking agent is 0.8 weight percent to 3 weight percent of the battery active substance. The invention also relates to the positive plate made by the method and comprises a lithium-ion battery of the positive plate. The battery achieved by using the positive plate made by the preparation method of the invention has stable electrical property and good cycle performance.

Description

technical field [0001] The invention relates to a method for manufacturing a positive pole piece of a lithium ion battery, a positive pole piece of a battery produced by the method, and a lithium ion battery including the positive pole piece. Background technique [0002] Lithium-ion batteries are divided into liquid lithium-ion batteries (LIB) and polymer lithium-ion batteries (PLIB). Since liquid lithium-ion batteries were successfully developed in 1990, due to their high specific energy, high energy density, high operating voltage, and application With unique advantages such as wide temperature range, low self-discharge rate, long cycle life, no pollution, light weight, and good safety performance, it can be used in a wide range of fields, such as mobile phones, wireless devices, notebooks, instruments, alarms, toys, remote control , aerospace, aviation, navigation, cameras, computers, communications, electric equipment, game consoles, household appliances, etc. [0003]...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/62H01M4/48H01M4/58H01M10/40H01M4/131H01M4/1391H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 张建昌江文锋肖峰
Owner BYD CO LTD
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