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Lithium iron phosphate lithium ion battery and machining method thereof

A lithium-ion battery, lithium iron phosphate technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problem of difficult bonding between positive active materials and current collectors, and achieve good bonding and improve slurry uniformity.

Active Publication Date: 2011-09-14
XTC NEW ENERGY MATERIALS(XIAMEN) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a lithium iron phosphate that can effectively improve the adhesion between the current collector and the active material for the problem of difficult bonding between the positive electrode active material and the current collector when the electrode sheet of the lithium iron phosphate battery is coated. Lithium-ion battery sheet and processing method thereof

Method used

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  • Lithium iron phosphate lithium ion battery and machining method thereof
  • Lithium iron phosphate lithium ion battery and machining method thereof
  • Lithium iron phosphate lithium ion battery and machining method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Slurry Preparation

[0032] First, dilute 30g of LA water-based adhesive with 900g of deionized water, stir at a speed of 600r / min for 40min to obtain adhesive, then add 25g of SP and 5g of KS-6 mixed conductive agent into the adhesive in 3 times, Stir in vacuum at a speed of 20000r / min for 60min to make a conductive colloid; then add 900g of lithium iron phosphate to the above conductive colloid in 3 times, adjust to 20-35Hz by revolution, 15-35Hz by rotation, and stir in vacuum for 240min. Obtain positive electrode slurry; sieve to make a slurry with a viscosity of 6000mpa.s.

[0033] 2. Coating

[0034] Adjust the coating temperature to: 80°C for the first section, 90°C for the second section, and 50°C for the third section. After the temperature is stable, apply the prepared slurry evenly on the surface of the aluminum foil, dry it, and finish. Coating the pole piece to obtain the positive pole piece of lithium ion battery made of lithium iron phosphate materia...

Embodiment 2

[0036] Similar to Example 1, the difference is that the binder is changed to 35g.

Embodiment 3

[0038] Similar to Example 1, the difference is that the binder is changed to 40g.

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Abstract

The invention provides a lithium iron phosphate lithium ion battery and a machining method thereof, which relate to lithium ion batteries and aim to effectively improve adhesiveness between a current collector and active substances. The lithium iron phosphate lithium ion battery is provided with the current collector, wherein the front and back of the current collector are coated with a conductive layer respectively; and the conductive layer comprises the following components in percentage by mass: 1 to 6 percent of conductive agent, 3 to 5 percent of adhesive and the balance of positive active substance. The machining method comprises the following steps of: mixing the adhesive and water to obtain assembly glue; adding the conductive agent into the assembly glue to obtain a conductive adhesive; adding lithium iron phosphate into the conductive adhesive to obtain positive paste; stirring the positive paste, regulating the viscosity to be 4,000 to 8,000 mpa.s, and performing screening to obtain paste; and coating the screened paste onto the front and back of the current collector, and drying the current collector to finish the coating to obtain the lithium iron phosphate lithium ion battery.

Description

technical field [0001] The invention relates to a lithium lithium ion battery, in particular to a positive electrode sheet of a lithium iron phosphate battery and a processing method thereof. Background technique [0002] Since the commercialization of lithium-ion batteries, LiCoO 2 Cathode materials have become the main cathode materials for lithium-ion batteries due to their high gram-specific capacity, high voltage platform, long cycle life, and good stability. However, cobalt resources are in short supply, expensive, and have certain toxicity. , Environmentally friendly lithium-ion battery cathode materials have become the mainstream research direction now. LiMn 2 o 4 , LiNiO 2 , ternary materials, etc., have restricted their development due to their own defects. [0003] LiFePO 4 With the advantages of extensive resources, low price, environmental friendliness, good thermal stability, and good cycle performance, it is expected to become a cathode material for a ne...

Claims

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Application Information

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IPC IPC(8): H01M4/136H01M4/62H01M4/1397H01M4/66
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 杨金洪钱文连黄昌荣
Owner XTC NEW ENERGY MATERIALS(XIAMEN) LTD
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