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A high-rate lithium-ion battery positive electrode slurry

A lithium-ion battery, cathode slurry technology, applied in battery electrodes, secondary batteries, electrode manufacturing, etc., can solve problems such as inability to meet charging rate requirements, improve liquid absorption and liquid retention performance, increase confidence, and improve charging rate. Effect

Active Publication Date: 2022-03-22
吉林省东驰新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the power storage devices for new energy vehicles are mainly lithium-ion batteries. With the rapid development of new energy vehicles, the requirements for the charging rate performance of batteries are getting higher and higher; lithium iron phosphate batteries are due to their superior safety, The advantages of long cycle life and other advantages are widely accepted by consumers. The conductive agents added to the positive electrode materials such as: carbon nanotubes, carbon nanofibers, superconducting carbon black, gas-phase nano-silicon and graphene and other superconducting carbons can improve the performance of the battery to a certain extent. Charge and discharge rate, but can not meet the requirements of charge rate above 10C

Method used

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  • A high-rate lithium-ion battery positive electrode slurry
  • A high-rate lithium-ion battery positive electrode slurry
  • A high-rate lithium-ion battery positive electrode slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Lithium-ion battery positive electrode slurry production includes the following steps: the material is measured by mass percentage,

[0035] (1) Add PVDF (polyvinylidene fluoride), lithium iron phosphate, quantum carbon, and N-methylpyrrolidone solvent into the storage metering tank;

[0036] (2) PVDF, lithium iron phosphate, quantum carbon, and N-methylpyrrolidone solvent are carried out in a ratio of 1.32 (wt%): 41.58 (wt%): 1.1 (wt%): 56.00 (wt%) through the storage metering tank Dynamic metering, automatic and continuous feeding, automatic feeding into the mixing and dispersing machine for pre-dispersion (kneading the powder and liquid first), the speed is 800-1200rpm, after online dispersion, the mixed powder is automatically input into the buffer tank through the outlet, and the mixed powder is mixed The dispersing machine, the buffer tank and the circulation tank are repeated 4 to 6 times before entering the transfer tank;

[0037] (3) The mixed powder enters th...

Embodiment 2

[0045] Lithium-ion battery positive electrode slurry production includes the following steps: the material is measured by mass percentage,

[0046] (1) Add PVDF (polyvinylidene fluoride), nickel cobalt lithium manganate, quantum carbon, and N-methylpyrrolidone solvent into the storage metering tank;

[0047](2) PVDF, nickel cobalt lithium manganese oxide, quantum carbon, N-methylpyrrolidone solvent are in proportion 1.02(wt%): 65.62(wt%): 1.36(wt%): 32.00(wt%) by the storage metering tank ) to carry out dynamic metering and automatic continuous feeding, and transport the main powder material and solvent into the feed port of the twin-screw pump cavity;

[0048] (3) Set the mixing element (gear) of the twin-screw pump at 600~1000rpm, keep the vacuum degree≧-0.65MPa, keep the temperature at 30±5°C, and the high-speed dispersion time is 3~5min, and transport it from the outlet of the twin-screw pump to the storage The material tank is degassed, the degassing maintains a vacuum d...

Embodiment 3

[0054] The cathode slurry for lithium ion batteries was prepared with reference to the scheme of Example 1, the difference being that the addition amount of each component: lithium iron phosphate was 46.08wt%, quantum carbon was 0.72wt%, PVDF was 1.20wt%, N-methyl Pyrrolidone is 52.00 wt%.

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Abstract

The invention provides a high-rate lithium-ion battery cathode slurry, which belongs to the technical field of lithium-ion batteries. The high-rate lithium-ion battery positive electrode slurry provided by the present invention is composed of the following components: positive electrode active material, quantum carbon, binder and solvent. The present invention uses quantum carbon with better conductivity and kinetic properties as a conductive agent, which is beneficial to obtain a lithium ion battery with good rate performance, improves the charge and discharge rate of the lithium battery, greatly shortens the charging time of the lithium battery, and solves the problem of the current lithium ion battery. The problems of long battery charging time and short driving range of vehicle power batteries make it easier for ordinary people to accept and use new energy vehicles.

Description

[0001] This application claims the priority of the Chinese patent application submitted to the China Patent Office on March 21, 2019, with the application number CN201910215464.7, and the title of the invention is "A High Rate Lithium-ion Battery Cathode Slurry", the entire content of which is incorporated by reference incorporated in this application. technical field [0002] The invention relates to the technical field of lithium ion batteries, in particular to a high-rate lithium ion battery cathode slurry. Background technique [0003] At present, the power storage devices for new energy vehicles are mainly lithium-ion batteries. With the rapid development of new energy vehicles, the requirements for the charging rate performance of batteries are getting higher and higher; lithium iron phosphate batteries are due to their superior safety, The advantages of long cycle life and other advantages are widely accepted by consumers. The conductive agents added to the positive e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/04H01M4/1391H01M4/1397H01M4/36H01M4/58H01M4/525H01M4/505H01M10/0525
CPCH01M4/625H01M4/04H01M4/1391H01M4/1397H01M4/362H01M4/5825H01M4/525H01M4/505H01M10/0525Y02E60/10
Inventor 康书文谢海明孙立群
Owner 吉林省东驰新能源科技有限公司
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