Preparation method for positive electrode for lithium iron phosphate secondary battery and lithium ion battery

A lithium ion battery, lithium iron phosphate technology, applied in the field of lithium ion batteries, can solve the problems of unsatisfactory rate performance and low temperature performance of lithium iron phosphate battery, and achieve high rate fast charge and discharge, excellent electronic and ionic conductivity, excellent The effect of low temperature performance

Inactive Publication Date: 2019-05-28
ZHUHAI COSMX BATTERY CO LTD
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of unsatisfactory rate performance and low-temperature performance of the existing lithium iron phosphate battery, to provide a preparation method of a positive electrode for a lithium iron phosphate secondary battery and a lithium ion battery, by optimizing the positive electrode slurry The formula makes the active material form a conductive layer of active material combined with points, lines and surfaces

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  • Preparation method for positive electrode for lithium iron phosphate secondary battery and lithium ion battery

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specific Embodiment approach 1

[0011] Embodiment 1: This embodiment records a method for preparing a positive electrode for a lithium iron phosphate secondary battery. The method is as follows: open the stirring tank, and add a conductive agent, lithium iron phosphate, and Adhesive and NMP, stir and disperse evenly at a revolution speed of 20~60rpm, and a dispersion disc speed of 200~2000rpm, adjust the revolution speed to 10~30rpm, take the material and measure the solid content (the purpose of the solid content measurement is to confirm the actual feeding of the process and the theoretical If there is any abnormality, the solid content of the slurry can be controlled within a reasonable range by adjusting the amount of solvent), turn on the vacuum pump, and keep the vacuum at -0.08~-0.09MPa , after stirring for 30 minutes, release the vacuum to obtain the positive electrode slurry, and apply the obtained positive electrode slurry on the positive electrode current collector to obtain the positive electrode....

specific Embodiment approach 2

[0012] Specific embodiment two: the preparation method of a positive electrode for a lithium iron phosphate secondary battery described in specific embodiment one, the particle size of the lithium iron phosphate is D10 0.1~0.6 μm, D50 0.7~2.0 μm, D90 ≤ 6 μm.

specific Embodiment approach 3

[0013] Specific embodiment three: the preparation method of a positive electrode for a lithium iron phosphate secondary battery described in specific embodiment one, the positive electrode binder is PVDF series or acrylic esters; the PVDF series is polyvinylidene fluoride Ethylene 5130 or polyvinylidene fluoride 900; the acrylates are polybutyl acrylate, polymethyl methacrylate or cyanoacrylate.

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Abstract

The invention discloses a preparation method of a positive electrode for a lithium iron phosphate secondary battery and a lithium ion battery, and belongs to the technical field of lithium ion batteries. The invention aims to solve the problem that the rate capability and the low-temperature performance of the existing lithium iron phosphate battery are not ideal. The method specifically comprisesthe following steps: opening a stirring tank, adding a conductive agent, lithium iron phosphate, a positive electrode adhesive and NMP according to the mass ratio of a formula design, performing uniform stirring and dispersing at the revolution rotating speed of 20-60 rpm when the rotating speed of a dispersing disc is 200-2, 000 rpm, adjusting the revolution rotating speed to 10-30 rpm, taking out the material, measuring the solid content, opening a vacuum pump, and keeping the vacuum degree of -0.08 to -0.09 MPa, performing stirring for 30 minutes, discharging vacuum to obtain positive electrode slurry, and arranging the positive electrode slurry on a positive electrode current collector in a coating manner to obtain the positive electrode. The positive electrode prepared by the invention has good adhesive strength and high ionic conductivity, and can realize high-rate rapid charging and discharging of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a positive electrode for a lithium iron phosphate secondary battery and a lithium ion battery. Background technique [0002] With the development of microelectronics technology in the 20th century, miniaturized equipment is increasing day by day, which puts forward high requirements on power supply. Lithium-ion power batteries have entered a large-scale practical stage. Among them, the widely used lithium iron phosphate battery has excellent performance, such as stable discharge voltage, high safety performance, and long cycle life. However, its electronic conductivity is poor, which limits its rate performance, especially low-temperature discharge performance, low-temperature cold start performance, and high-rate charge-discharge performance are difficult to meet the needs. Contents of the invention [0003] The purpose of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397H01M4/04H01M4/66H01M4/36H01M4/58H01M4/62H01M10/0525
CPCY02E60/10
Inventor 申红光靳玲玲何江龙朱意李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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