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High performance lithium ion secondary battery and manufacture method

A secondary battery, lithium ion technology, used in secondary batteries, electrode manufacturing, battery electrodes, etc., can solve problems such as impact, physical and mental harm of production workers and surrounding environment, gas leakage, etc., to achieve abundant resources and controllable production cycle , the effect of low cost

Inactive Publication Date: 2008-03-19
SHENZHEN YILI ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the existing lithium-ion secondary battery manufacturing technology, the solvent used to dissolve the active material of the battery pole piece during the preparation of the positive and negative electrodes is all subject to an organic solvent system, for example: using N-methylpyrrolidone-polyvinylidene fluoride (NMP- PVDF) + conductive carbon black + lithium cobaltate to make positive electrode slurry is one of them. This type of slurry will produce a large amount of organic solvent emissions during the coating production process. Although part of the exhaust gas can be recycled and treated, but Still part of the gas leaks and is discharged into the air, which has great harm and impact on the physical and mental health of production workers and the surrounding environment.

Method used

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  • High performance lithium ion secondary battery and manufacture method
  • High performance lithium ion secondary battery and manufacture method
  • High performance lithium ion secondary battery and manufacture method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] For the positive electrode, take modified lithium ferrous phosphate (LiFe 0.75 Ni 0.25 PO4)+organic silica gel crosslinking additive, modified polyethylene oxide+conductive carbon black=100:30:1 (by weight), add 25% water of the total weight, mix in the mixer, stir, then filter, evenly Coated on aluminum foil and dried at 55°C to make positive electrode sheet.

[0034] For the negative electrode, take artificial graphite + conductive carbon black + styrene-butadiene rubber + sodium carboxymethyl cellulose = 90%: 1%: 2%: 2%, mix with 52% water, stir, filter, and evenly coat on copper Foil, after drying at 70 ℃, made of negative electrode sheet.

[0035] The positive and negative pole pieces are rolled, riveted with lugs, wound with the separator to form a pole assembly and put into a 16340 (CR123A) battery case, and 2-4g of electrolyte is added to each battery case.

[0036] After sealing, let it stand at 60°C for 3 days, pre-charge it with a small current of 0.01C, s...

Embodiment 2

[0038] Take modified lithium ferrous phosphate (LiFe 0.65 mn 0.35 PO4)+polyvinyl alcohol+conductive carbon black=100:15:2 (by weight), add 28% water of the total weight, mix in the mixer, stir, then filter, evenly coated on the aluminum foil, after 85 ℃ drying to make a positive electrode sheet.

[0039] Negative electrode: Take artificial graphite + conductive carbon black + styrene-butadiene rubber + sodium carboxymethyl cellulose = 95%: 0.5%: 2.5%: 2%:, mix with 55% water, stir, filter, and evenly coat on copper Foil, after drying at 70 ℃, made of negative electrode sheet.

[0040]The positive and negative pole pieces are rolled, riveted with lugs, wound with the separator to form a pole assembly and put into a 16340 (CR123A) battery case, and 2-4g of electrolyte is added to each battery case.

[0041] After sealing, let stand at 15°C for 5 days, pre-charge with a small current of 0.1C, stand at 70°C for 18 days, divide the capacity, and pass 1C discharge test. The batte...

Embodiment 3

[0043] Take modified lithium ferrous phosphate (LiFe 0.55 Ca 0.45 PO4) + polyacrylamide + conductive carbon black = 120: 10: 1 (by weight), add 25% of the total weight of water, mix in the mixer, stir, then filter, evenly coated on aluminum foil, after 150 ℃ drying to make a positive electrode sheet.

[0044] Negative electrode: Take artificial graphite + conductive carbon black + styrene-butadiene rubber + sodium carboxymethyl cellulose = 94.5%: 0.5%: 3%: 2%:, mix with 58% water, filter, and evenly coat on copper foil After drying at 70°C, the negative electrode sheet was made.

[0045] The positive and negative pole pieces are rolled, riveted with lugs, wound with the separator to form a pole assembly and put into a 16340 (CR123A) battery case, and 2-4g of electrolyte is added to each battery case.

[0046] After sealing, let it stand at 70°C for 1 day, pre-charge it with a small current of 0.65C, stand at 60°C for 15 days, divide the capacity, and pass 1C discharge test....

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Abstract

The invention discloses a high-performance lithium ion secondary battery. The active substance of the anode of the battery is lithium-containing compound oxide of the chemical formula: LiFe(1-y)MyPO4, wherein M is one element selected from Co, Ni, Mn, Al, S, Ca, K, Na, Mo and Cr, y is more than 0 but less than or equal to 0.75. A water-soluble polymer is used as an adhesive. The anode of the inventive lithium ion secondary battery is prepared by mixing LiFe(1-y)MyPO4 compound with the water-soluble polymer at a given weight ratio, adding a conductive substrate and water as an solvent, mixing, stirring and filtering to obtain a homogenous slurry, coating the flurry on the surface of an aluminum foil, drying at 55-150 DEG C to obtain an anode piece, winding together with a cathode piece, assembling, infusing, standing, pre-charging with a 0.01C-0.65C current, standing again, and fractioning volumes. The inventive high-performance lithium ion secondary battery has the advantages of good property of high-current charge and discharge, long cycle life, high safety, environmental friendliness, and low cost.

Description

Technical field: [0001] The invention relates to a secondary battery, in particular to a lithium ion secondary battery and a preparation method thereof. Background technique: [0002] Lithium-manganese batteries on the market today, such as CR123A, CR2, CR-P2, 2CR5, CR-V3 and other models, because of their high energy density, small self-discharge, stable output voltage, high power characteristics, etc. It is widely used in cameras, flashlights and digital products, but the high cost, poor safety and non-reusability of this type of battery limit its development and promotion. Trying to replace it with a rechargeable lithium-ion battery, the original operating voltage is 3.7V. Through the step-down principle, the working output voltage is close to that of a lithium-manganese primary battery. However, after actual use, it is found that the high-current discharge performance is not good, and it will still Burn out super bright tungsten flashlight. [0003] The general structu...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/48H01M4/62H01M4/04H01M10/40
CPCY02E60/122Y02E60/10
Inventor 白科董超祺
Owner SHENZHEN YILI ENERGY
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