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Large-capacity high power polymer ferric lithium phosphate power cell and preparation method thereof

A technology for lithium iron phosphate and power batteries, which is applied in the field of large-capacity and high-power polymer lithium iron phosphate power batteries and its preparation, can solve the problems of lithium iron phosphate positive electrode slurry preparation and coating difficulties, and solve the problems of preparation and coating Difficult deployment, improved safety, and low cost

Inactive Publication Date: 2009-04-15
MCNAIR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art, solve the difficulties in the preparation and coating of lithium iron phosphate positive electrode slurry by improving the preparation process conditions of the positive electrode slurry, and use more than two batteries for stacking This method provides a preparation method for a large-capacity and high-power polymer lithium-ion power battery. Through this method, a large-capacity and high-power polymer lithium-ion power battery is produced, so that the battery can be better used in electric tools. , electric bicycles, motorcycles, automobile power sources and backup power batteries

Method used

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  • Large-capacity high power polymer ferric lithium phosphate power cell and preparation method thereof
  • Large-capacity high power polymer ferric lithium phosphate power cell and preparation method thereof
  • Large-capacity high power polymer ferric lithium phosphate power cell and preparation method thereof

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Embodiment 1

[0045] Embodiment 1, a high-capacity and high-power polymer lithium iron phosphate power battery described in this embodiment includes a positive electrode, a negative electrode, a diaphragm, a polymer gel electrolyte and a battery case 1, and the battery case 1 is made of aluminum plastic The positive electrode includes a positive electrode active material, a binder, a conductive agent, and a positive electrode current collector; the positive electrode active material is lithium iron phosphate (LiFePO 4 ) material; the negative electrode includes negative electrode material, conductive agent, thickener, binder and negative electrode current collector; Weld the two positive tabs and the negative tabs together; if it is multi-cell stacking, connect the tabs at the bottom of the cell, and expose two pairs of positive and negative tabs, and connect them separately; in order to prepare Convenient, the single cell adopts a winding structure; this embodiment uses two cells, which ar...

Embodiment 2

[0079] Embodiment 2. Compared with Embodiment 1, this embodiment differs in that the materials used in the positive electrode slurry and their weight percentage ratios are: 83% lithium iron phosphate, 4% superconducting carbon (Super-P), Conductive carbon black 2.5%, conductive graphite (KS-6) 2%, carbon nanotube 2%, polyvinylidene fluoride 6.5%; positive electrode coating surface density 9.5mg / cm 2 , positive electrode compaction density 1.95g / cm 3 ; The material used in the negative electrode slurry and its weight percentage ratio are: negative electrode material 90%, superconducting carbon (Super-P) 3%, conductive carbon black 2%, styrene-butadiene rubber (SBR) 3%, carboxymethyl fiber Plain sodium (CMC) 2%; Negative electrode coating surface density 3.8mg / cm 2， , negative electrode compacted density 1.45g / cm 3 ; The composition, structure and product preparation method of the product of this embodiment are the same as in Example 1, and will not be repeated here.

Embodiment 3

[0080] Embodiment 3, compared with Embodiment 1, the difference of this embodiment is: the material used in the positive electrode slurry and its weight percentage ratio are: lithium iron phosphate 85%, superconducting carbon (Super-P) 5.5%, Conductive carbon black 2%, conductive graphite (KS-15) 1.5%, polyvinylidene fluoride 6%; positive electrode coating surface density 9mg / cm 2 , positive compaction density 2g / cm 3 The material used in the negative electrode slurry and its weight percentage ratio are: negative electrode material 91%, superconducting carbon (Super-P) 3%, conductive graphite (KS-15) 2%, styrene-butadiene rubber (SBR) 2.5%, Sodium carboxymethyl cellulose (CMC) 1.5%; Negative electrode coating surface density 3.8mg / cm 2 , negative electrode compacted density 1.4g / cm 3 ; The composition, structure and product preparation method of the product of this embodiment are the same as in Example 1, and will not be repeated here.

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Abstract

The invention discloses a large-capacity high-power polymer lithium iron phosphate power battery. The weight ratio of anode slurry is as follows: 81 to 85 percent of lithium iron phosphate, 1 to 5.5 percent of superconduction carbon, 0 to 2.5 percent of conductive carbon soot, 0 to 4 percent of conductive black lead, 0 to 2.5 percent of crystalline flake graphite, 0 to 2 percent of carbon nanometer tube as well as 6 to 7.5 percent of polyvinylidene fluoride; the weight ratio of cathode slurry is as follows: 89 to 91 percent of cathode material, 1 to 3.5 percent of superconduction carbon, 0 to 2 percent of conductive carbon soot, 0 to 4 percent of conductive black lead, 2.5 to 3.5 percent of styrene-butadiene rubber as well as 1.5 to 2 percent of sodium carboxymethyl cellulose; the steps for preparing the battery are as follows: preparing slurry, coating the anode and the cathode, rolling and pressing a polar plate, transversely and separately cutting the polar plate, baking the polar plate, welding the polar ears of the anode and the cathode, preparing a battery cell, putting the electric core into a shell and sealing, baking the electric core, injecting liquid into the battery as well as forming the battery and dividing the volume of the battery. The invention relates to a lithium-ion secondary battery which can provide drive energies for electric tools, electric bicycles, motor cars and electric vehicles.

Description

technical field [0001] The invention relates to a battery and a preparation method thereof, in particular to a large-capacity and high-power polymer lithium iron phosphate power battery and a preparation method thereof. Background technique [0002] Today, with the increasing shortage of oil resources and increasingly serious environmental pollution, the harmonious development of energy, resources, environment and human society has increasingly become the focus of social attention. It is seeking to develop alternative energy sources to traditional petrochemical energy, to realize the development of harmless resource industries, and to seek human harmony. Environmental harmony is particularly urgent. In modern society, people's demand for large-capacity and high-power batteries is becoming stronger and stronger, especially for power tools, electric bicycles, motorcycles, automobile power sources and backup power batteries. The currently used power batteries are mainly lead-a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M4/02H01M10/38H01M4/04
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 贺艳兵陈武李中延唐致远苏艳军
Owner MCNAIR TECH
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