Method for preparing water-based super-nano lithium iron phosphate battery

A lithium iron phosphate battery, lithium iron phosphate technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of no improvement in low temperature resistance, and achieve the effects of improved bonding fastness, excellent low temperature, and low resistance

Active Publication Date: 2019-06-21
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its low temperature resistance performance is still not improved, and it cannot have good performance at lower temperatures.

Method used

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  • Method for preparing water-based super-nano lithium iron phosphate battery

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Embodiment 1

[0039] A method for preparing a water-based super nanometer lithium iron phosphate battery, said preparation method comprising the following steps:

[0040] (1) Preparation of positive and negative electrode slurry:

[0041] (1.1) Preparation of positive electrode slurry: sand-grind the lithium iron phosphate material to obtain lithium iron phosphate powder particles with D50≤4 μm, and then prepare it according to the formula: 90% of lithium iron phosphate powder particles, 5% of acetylene black and 5% styrene-butadiene emulsion was mixed and homogenized to obtain positive electrode slurry;

[0042] (1.2) Negative electrode slurry preparation: According to the formula: 89% of artificial graphite, 3% of carboxymethyl cellulose, 3% of styrene-butadiene emulsion and 5% of acetylene black were mixed and homogenized to obtain negative electrode slurry.

[0043]The preparation method of artificial graphite described therein is as follows:

[0044] (S.1) Preparation of polymer emul...

Embodiment 2

[0054] A method for preparing a water-based super nanometer lithium iron phosphate battery, said preparation method comprising the following steps:

[0055] (1) Preparation of positive and negative electrode slurry:

[0056] (1.1) Preparation of positive electrode slurry: Sand mill the lithium iron phosphate material to obtain lithium iron phosphate powder particles with D50≤4 μm, and then prepare it according to the formula: 94% of lithium iron phosphate powder particles, 5% of Ketjen black and 1% polytetrafluoroethylene emulsion is mixed and homogenized to obtain positive electrode slurry;

[0057] (1.2) Negative electrode slurry preparation: According to the formula: 95% artificial graphite, 1% carboxymethyl cellulose, 1% polytetrafluoroethylene emulsion and 3% Ketjen black were mixed and homogenized to obtain negative electrode slurry.

[0058] The preparation method of artificial graphite described therein is as follows:

[0059] (S.1) Preparation of polymer emulsion: a...

Embodiment 3

[0069] A method for preparing a water-based super nanometer lithium iron phosphate battery, said preparation method comprising the following steps:

[0070] (1) Preparation of positive and negative electrode slurry:

[0071] (1.1) Preparation of positive electrode slurry: Sand mill the lithium iron phosphate material to obtain lithium iron phosphate powder particles with D50≤4 μm, and then prepare it according to the formula: 92% of lithium iron phosphate powder particles, 4% of vapor phase growth carbon fiber and polyvinyl alcohol 4% to obtain positive electrode slurry after mixing and homogenizing;

[0072] (1.2) Negative electrode slurry preparation: According to the formula: 92% artificial graphite, 2% carboxymethyl cellulose, 2% polyvinyl alcohol and 4% vapor-phase grown carbon fiber were mixed and homogenized to obtain the negative electrode slurry.

[0073] The preparation method of artificial graphite described therein is as follows:

[0074] (S.1) Preparation of pol...

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Abstract

The invention relates to the field of preparation of lithium batteries, and in particular to a method for preparing a water-based super-nano lithium iron phosphate battery. The lithium iron phosphatebattery provided by the invention is prepared from the following steps: firstly preparing positive and negative electrode slurry, respectively coating the obtained positive and negative electrode slurry on the surface of an aluminum foil to obtain positive and negative pole pieces, and laminating the positive and negative pole pieces, then placing the same in a battery shell, injecting electrolyte, and finally completing formation and volume separation steps to obtain the lithium iron phosphate battery. By adoption of the method provided by the invention, the problem of poor performance at lowtemperature of the lithium iron phosphate battery in the prior art is overcome, and the lithium iron phosphate battery has the advantages of good low temperature resistance, high energy density, better safety performance and smaller resistance.

Description

technical field [0001] The invention relates to the field of lithium battery preparation, in particular to a method for preparing a water-based super nanometer lithium iron phosphate battery. Background technique [0002] "Lithium battery" is a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution. In 1912, the lithium metal battery was first proposed and studied by Gilbert N. Lewis. In the 1970s, M.S.Whittingham proposed and began to study lithium-ion batteries. Due to the very active chemical properties of lithium metal, the processing, storage and use of lithium metal have very high environmental requirements. With the development of science and technology, lithium batteries have become the mainstream now. [0003] The lithium iron phosphate / graphite system is now a relatively common system in the new generation of lithium-ion secondary batteries. Because iron and phosphorus, the main ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0583H01M4/58H01M4/587
CPCY02E60/10Y02P70/50
Inventor 杜小红李凡群赵星星苏文俊贺勇
Owner WANXIANG 123 CO LTD
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