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Manufacturing method of lithium iron phosphate anode

A lithium iron phosphate and manufacturing method technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of high cost, unfavorable safety, increased production cost and difficulty in process control of PVDF and NMP, so as to avoid pollution and harm to the human body Hazards, increased volume specific energy, and the effect of excellent cycle performance

Active Publication Date: 2012-07-25
山西鼎能启源新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are many problems in the above process. First, the cost of PVDF and NMP is very high, and the main high-quality PVDF manufacturers are all foreign, which is not good for the safety of my country's industrial development; Vapors are an occupational hazard
In addition, the above system needs to avoid the influence of moisture, and the manufacturer needs to build a drying plant, which also greatly increases the production cost and the difficulty of process control
In particular, it should be noted that the operating environment and process required by the oily system are very strict, and it is very easy to have defects such as powder falling, falling off, and exposed foil.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 35 kg of purified water into the beating equipment, first add 0.3 kg of battery-grade CMC, and then stir for 2 hours at a speed of 1000 rpm to form a uniform liquid. Then add 8.4 kilograms of PTFE on a dry basis, (i.e. 14 kilograms of emulsions in which PTFE is dispersed in water, 60% of the mass concentration of PTFE) and stir for 0.5 hours, add 21 kilograms of lithium iron phosphate and 0.3 kilograms of conductive graphite, and stir for 2 hours. Finally add water until the slurry quality is 100 kg.

[0022] The slurry is coated on a coating machine and then dried in an oven. The oven is divided into two sections, the first section is drying in the air, the temperature is controlled at 85°C; the second section is an oven with a nitrogen protection device, and the temperature is controlled at 300°C. After this section is dried, there is a cold section, which reduces the temperature of the pole piece to 90°C. The cooling zone needs to be fed with nitrogen for atmos...

Embodiment 2

[0025] The manufacturing process of 1 ton slurry of the above ingredients is as follows:

[0026] Add 160 kg of water into the beating equipment, then add 8 kg of CMC, and then stir at high speed for 10 hours at a stirring speed of 5000 rpm to form a uniform liquid. Then add 3 kilograms of PTFE emulsion (PTFE is dispersed in water emulsion, mass concentration is 60%) on a dry basis, then stir for 5 hours, add 760 kilograms of lithium iron phosphate and 8 kilograms of acetylene black, and then stir for 8 hours. Finally add water to a total weight of 1 ton.

[0027] The slurry is coated on a coating machine and then dried in an oven. The oven is divided into two sections, the first section is drying in the air, the temperature is controlled at 130°C; the second section is an oven with a nitrogen protection device, and the temperature is controlled at 300°C. After this section is dried, there is a cold section, which reduces the temperature of the pole piece to below 50°C. The...

Embodiment 3

[0031] Add 300g of water into the beating equipment, then add 8g of CMC, and then stir at high speed for 3 hours to form a uniform liquid. Then add the PTFE of 20g (on dry basis) (PTFE is dispersed in the emulsion of water, mass concentration is 20%), stir again 1 hour, add the super conductive carbon black (Super P) of the lithium iron phosphate of 364g and 8g, again Stir for 4 hours. Finally add water to a total mass of 1 kg.

[0032] The slurry is coated on a coating machine and then dried in an oven. The oven is divided into two sections, the first section is drying in the air, and the temperature is controlled at 105°C; the second section is an oven with an argon protection device, and the temperature is controlled at 280°C. After this section is dried, there is a cold section, which reduces the temperature of the dried positive electrode to 80°C. The cooling zone also needs to be fed with argon for atmosphere protection. After drying, the positive electrode sheet is ...

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PUM

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Abstract

The invention relates to a manufacturing method of a lithium iron phosphate anode. The manufacturing method comprises the following steps: adding a polytetrafluoroethylene emulsion to an aqueous carboxymethyl cellulose solution, stirring, adding lithium iron phosphate and a conductive agent, stirring, adding water to form a slurry, shaping by coating the slurry, drying, and sintering in an inert atmosphere, and compacting by a roller press. By using the manufacturing method provided in the invention and utilizing an aqueous solution system to manufacture the anode of a cell, the pollution of NMP (N-methyl pyrrolidone) to the environment and harms of the NMP to human bodies are avoided, and the volumetric specific energy of the cell is increased.

Description

technical field [0001] The invention relates to a manufacturing process of a positive electrode for a lithium ion battery, in particular to a manufacturing method of a lithium iron phosphate positive electrode. Background technique [0002] Due to the advantages of good safety, excellent performance, abundant resources, and stable platform, lithium iron phosphate batteries have developed rapidly in production scale in recent years and have become an important pillar industry in China. Lithium iron phosphate material is the core of lithium iron phosphate battery. At present, most manufacturers of lithium iron phosphate at home and abroad use oily systems: NMP (N-methylpyrrolidone) is generally used as solvent, PVDF (polyvinylidene fluoride) is used as adhesive, super conductive carbon black (Super P), acetylene Black, conductive graphite is used as the conductive agent, lithium iron phosphate is used as the main active substance, and a suspension is formed after high-speed d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397
CPCY02E60/122Y02E60/10
Inventor 刘登科郑淑芬崔正朔刘宇
Owner 山西鼎能启源新能源科技有限公司
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