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Low-temperature lithium iron phosphate battery and preparation method thereof

A lithium iron phosphate battery, low-temperature technology, applied in the manufacture of electrolyte batteries, secondary batteries, battery electrodes, etc., can solve the problems of inability to meet energy storage requirements, short discharge time, etc.

Inactive Publication Date: 2019-05-24
成都特隆美储能技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By improving the lithium iron phosphate battery, the discharge capacity is generally about 70% at -20°C, but it cannot be discharged or the discharge time is short at -40°C, and the discharge capacity does not exceed 30%, which cannot meet the energy storage at -40°C Require

Method used

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Examples

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Effect test

preparation example Construction

[0051] The invention provides a method for preparing a low-temperature lithium iron phosphate battery, comprising the following steps:

[0052] A) coating the positive electrode slurry on the positive electrode current collector, and drying to obtain the positive electrode sheet;

[0053] The positive electrode slurry includes a positive electrode active material, a positive electrode conductive agent, a positive electrode binder and a positive electrode solvent;

[0054] The positive active material is Ti 3 SiC 2 Modified carbon-coated lithium iron phosphate; the positive electrode conductive agent is carbon nanotubes and graphene;

[0055] B) coating the negative electrode slurry on the negative electrode current collector, and obtaining the negative electrode sheet after drying;

[0056] The negative electrode slurry includes negative electrode active material, negative electrode conductive agent, negative electrode binder, thickener and negative electrode solvent;

[0...

Embodiment 1

[0076] The positive electrode sheet is prepared as follows:

[0077] The proportion of S1 positive electrode slurry is: Ti 3 SiC 2 Modified carbon-coated nanoscale lithium iron phosphate: carbon nanotubes: graphene: polyvinylidene fluoride=96:2:1:1,

[0078] S2 Add polyvinylidene fluoride to N-methylpyrrolidone, and make 10% adhesive glue by 3h stirring

[0079] S3 will Ti 3 SiC 2 Modified carbon-coated nano-scale lithium iron phosphate, carbon nanotubes and graphene are added to the glue, stirred by double planets and fast stirring plates for 4 hours, and then centrifugally dispersed. The centrifugal dispersion speed is 10L / min. Material viscosity is controlled at 3000Pa.s~4500Pa.s

[0080] The S4 positive current collector uses nano-coated aluminum foil with a total thickness of 16 μm, and its nano-coating thickness is 400 nanometers

[0081] S5 uses an extrusion coater to coat the positive electrode slurry on the coated aluminum foil, and through drying, rolling, slit...

Embodiment 2

[0095] The positive electrode sheet is prepared as follows:

[0096] The proportion of S1 positive electrode slurry is: Ti 3 SiC 2 Modified carbon-coated nanoscale lithium iron phosphate: carbon nanotubes: graphene: polyvinylidene fluoride=95:2:2:1,

[0097] S2 Add polyvinylidene fluoride to N-methylpyrrolidone, and make 10% adhesive glue by 3h stirring

[0098] S3 will Ti 3 SiC 2 Modified carbon-coated nano-scale lithium iron phosphate, carbon nanotubes and graphene are added to the glue, stirred by double planets and fast stirring plates for 4 hours, and then centrifugally dispersed. The centrifugal dispersion speed is 10L / min. Material viscosity is controlled at 3000Pa.s~4500Pa.s

[0099] The S4 positive current collector uses nano-coated aluminum foil with a total thickness of 16 μm, and its nano-coating thickness is 400 nanometers

[0100] S5 uses an extrusion coater to coat the positive electrode slurry on the coated aluminum foil, and through drying, rolling, slit...

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Abstract

The invention provides a low-temperature lithium iron phosphate battery, which comprises a positive plate, a negative plate, a diaphragm and electrolyte. The positive plate is prepared by coating a positive current collector with positive paste including a positive active material, positive conductive agents, a positive binder and a positive solvent. The positive active material is Ti3SiC2-modified carbon-coated lithium iron phosphate. The positive conductive agents are carbon nanotubes and graphene. The negative plate is prepared by coating a negative current collector with negative paste including negative active materials, negative conductive agents, a negative binder, a thickener and a negative solvent. The negative active materials are artificial graphite and mesophase carbon microspheres. The negative conductive agents are carbon nanotubes and graphene. The experimental results show that the discharge capacity of the battery in the invention at minus 20 DEG C is 2488mAh and is 88.13% of that at room temperature, and the discharge capacity of the battery at minus 40 DEG C is 2215mAh and is 78.46% of that at room temperature.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a low-temperature lithium iron phosphate battery and a preparation method thereof. Background technique [0002] The increasingly prominent environmental and resource problems have promoted the rapid development of new energy represented by wind energy and solar energy. At present, the development of these renewable energy sources is facing the bottleneck problems of poor power quality and difficulty in grid connection. At the same time, at this stage, users have higher and higher requirements for power quality and power quality. The traditional power system can no longer meet the needs of users well. New grid technologies such as strong smart grids and micro grids have emerged as the times require. Energy storage technology is regarded as a key technology to solve the grid connection of new energy power generation and build a smart grid. As an energy storage batte...

Claims

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Application Information

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IPC IPC(8): H01M4/136H01M4/133H01M4/36H01M4/58H01M4/587H01M4/62H01M4/66H01M10/0567H01M10/0525H01M10/058B82Y30/00
CPCY02E60/10Y02P70/50
Inventor 高培蒲彦宁邹才华
Owner 成都特隆美储能技术有限公司
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