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Lithium-ion power cell aqueous sizing agent and manufacturing method thereof

A power battery and water-based slurry technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., to achieve the effects of improving the manufacturing performance of pole pieces, reducing manufacturing costs, and improving performance

Inactive Publication Date: 2012-03-21
ZHEJIANG CHAOWEI CHUANGYUAN INDUSTRAIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the use of water-based formulations comes at the expense of battery capacity and cycle life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Accurately weigh 50.00kg of lithium iron phosphate, 0.94kg of flake graphite, 1.50kg of acetylene black, and 0.024kg of lithium sulfite into a "V" type mixer and mix for 30 minutes. Weigh 50kg of deionized water, heat it to 90°C, add 1.20kg of nitrile rubber and 1.00kg of styrene-butadiene rubber, stir until completely dissolved and vacuum until there are no bubbles in the glue. Then add the pre-mixed powder into the prepared glue in 4 times, stir until uniform, adjust the viscosity, and vacuumize. After the filtered slurry is coated, rolled and sheet-made, a positive electrode sheet is obtained.

[0031] To prepare the same weight of oily slurry, 45Kg to 50Kg of NMP (N-pyrrolidone) is needed.

Embodiment 2

[0033] Accurately weigh 50.00 kg of negative electrode graphite, 0.53 kg of acetylene black, and 0.045 kg of lithium tetraborate, and put them into a "V" type mixer and mix for 30 minutes. Weigh 50kg of deionized water, heat to 90°C, add 1.20kg of nitrile rubber and 1.00kg of butyl rubber, stir until completely dissolved and vacuum until there are no bubbles in the glue. Then add the pre-mixed powder into the prepared glue in 4 times, stir until uniform, and then vacuumize. After the filtered slurry is coated, rolled and sheet-made, a negative electrode sheet is obtained.

[0034] The pole pieces prepared in Example 1 and Example 2 were made into a 7Ah cell by adding a diaphragm, and sealed with liquid, left to stand and activated. The activation system was: after charging at 0.01C for 6 hours, then charging at 0.02C for 6 hours Hours later, turn to constant voltage charging for 8 hours, and the constant voltage is 3.0V.

Embodiment 3

[0036] Accurately weigh 50.00kg of lithium iron phosphate, 0.94kg of flake graphite, 1.50kg of acetylene black, and 0.024kg of lithium fluoride into a "V" type mixer and mix for 30 minutes. Weigh 50kg of deionized water, heat to 90°C, add 1.00kg of polyvinyl acetate and 1.30kg of styrene-butadiene rubber, stir until completely dissolved and vacuum until there are no bubbles in the glue. Then add the pre-mixed powder into the prepared glue in 4 times, stir until uniform, and then vacuumize. After filtering, the positive electrode aqueous slurry is obtained.

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PUM

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Abstract

The invention discloses a lithium-ion power cell aqueous sizing agent which comprises the following components according to weight percent: 40%-50% of powder, 40%-50% of solvent, 4%-5% of binder and 0.02%-2% of additive. The method of manufacturing the lithium-ion power cell aqueous sizing agent comprises the following steps: pretreating, premixing, preparing glue and preparing the sizing agent. By adopting the technical scheme, active matters are added in the formula, so that the circulating life of a cell is effectively prolonged; relative to the oily formula, deionized water is adopted in the invention as the solvent so that the manufacturing cost of the cell is reduced; and in the invention, aqueous glue which has glueyness and plasticity is adopted, so that the performance of the sizing agent and the manufacturing performance of a pole piece are improved.

Description

technical field [0001] The invention relates to an aqueous slurry for a lithium ion power battery. Background technique [0002] As people's requirements for lithium-ion batteries are getting higher and higher, lithium-ion batteries have begun to develop in the direction of large-capacity and high-power power batteries. Compared with portable communication power supplies, the total price of power batteries far exceeds the customer's affordability, and it is particularly important to reduce battery manufacturing costs. Abandoning the traditional oil-based lithium battery formula and using water-based formula is an effective way to reduce costs. . For example, lithium iron phosphate is used as the positive electrode material. Calculated according to the solid content of 55%, the solvent NMP (N-pyrrolidone) is consumed for every 1Ah battery. When the battery adopts water-based formula, it can save 0.24 yuan. But the use of water-based formulations comes at the expense of bat...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139H01M4/62
CPCY02E60/122Y02E60/10
Inventor 邢长生
Owner ZHEJIANG CHAOWEI CHUANGYUAN INDUSTRAIAL
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