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Anode and cathode conductive additive for secondary lithium battery, method for preparing conductive additive, and method for preparing secondary lithium battery

A conductive additive, lithium secondary battery technology, applied in battery electrodes, electrolyte battery manufacturing, non-aqueous electrolyte battery and other directions, can solve the problems of limited practical application, high price, difficult to meet the continuous charging and discharging of batteries, etc., to achieve high rate Charge and discharge, improve high temperature performance, the effect of superior performance

Active Publication Date: 2012-07-04
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the former is cheap, it is difficult to meet the continuous charge and discharge of the battery at a high rate; although the latter has excellent performance, especially suitable for high-power batteries, its expensive price limits its practical application in lithium secondary batteries

Method used

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  • Anode and cathode conductive additive for secondary lithium battery, method for preparing conductive additive, and method for preparing secondary lithium battery
  • Anode and cathode conductive additive for secondary lithium battery, method for preparing conductive additive, and method for preparing secondary lithium battery
  • Anode and cathode conductive additive for secondary lithium battery, method for preparing conductive additive, and method for preparing secondary lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Weigh 0.2g of polyvinylidene fluoride (PVDF) binder and dissolve it in 5 grams of N-methylpyrrolidone, then add 0.6g of graphene powder conductive additive, and stir evenly. Subsequently, 3.2 g of lithium iron phosphate positive electrode active material was added, stirred and dispersed for 1 hour. The obtained slurry was uniformly coated on an aluminum foil, dried under vacuum at 100° C., and rolled to form a positive electrode sheet. with LiPF 6 The solution is an electrolyte, and Cellgard2400 is used as a diaphragm to assemble a lithium-ion battery. The measured discharge capacity was 142mAh / g at 1C, 110mAh / g at 10C, and 80mAh / g at 30C. After the battery is charged and discharged 500 times at 1C, the capacity decay is less than 5%.

Embodiment 2

[0044] Weigh 0.2g of polyvinylidene fluoride (PVDF) binder and dissolve it in 5g of N-methylpyrrolidone, then add 0.2g of graphene powder conductive additive, and stir evenly. Subsequently, 3.6 g of lithium iron phosphate positive electrode active material was added, stirred and dispersed for 1 hour. The obtained slurry was uniformly coated on an aluminum foil, dried under vacuum at 100° C., and rolled to form a positive electrode sheet. with LiPF 6 The solution is an electrolyte, and Cellgard2400 is used as a diaphragm to assemble a lithium-ion battery. The measured discharge capacity was 140mAh / g at 1C, 100mAh / g at 10C, and 60mAh / g at 30C. After the battery is charged and discharged 500 times at 1C, the capacity decay is less than 5%.

Embodiment 3

[0046] Weighing 1g of graphene solids was added to 100g of N-methylpyrrolidone, and ultrasonically treated for 15 minutes to obtain a uniformly dispersed graphene sol. The above-mentioned graphene sol was concentrated to a slurry with a graphene mass concentration of 5% by centrifugation.

[0047] Weigh 0.2g of polyvinylidene fluoride (PVDF) binder and dissolve it in 1 gram of N-methylpyrrolidone, then add 4g of graphene slurry with a mass concentration of 5% prepared in the previous step, and stir evenly. Subsequently, 3.6 g of lithium iron phosphate positive electrode active material was added, stirred and dispersed for 1 hour. The obtained slurry was uniformly coated on an aluminum foil, dried under vacuum at 100° C., and rolled to form a positive electrode sheet. with LiPF 6 The solution is an electrolyte, and Cellgard2400 is used as a diaphragm to assemble a lithium-ion battery. The measured discharge capacity was 140mAh / g at 1C, 105mAh / g at 10C, and 69mAh / g at 30C. A...

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Abstract

The invention discloses an anode and cathode conductive additive for a secondary lithium battery, a method for preparing the conductive additive, and a method for preparing the secondary lithium battery. The conductive additive is graphene or a mixture of the graphene and other conductive materials, is graphene powder or mixture powder of graphene and other conductive materials, and also can be graphene or mixture conductive agent slurry of the graphene and other conductive materials, which is uniformly dispersed in water or an organic solvent or in water or an organic solvent which contains a dispersing agent. The graphene conductive additive is suitable for preparing the anode and cathode of the secondary lithium battery, and has the obvious advantage of improving the high-rate performance and cycle stability of the secondary lithium battery compared with other conductive additives at present.

Description

technical field [0001] The invention belongs to the field of energy storage materials, and in particular relates to a conductive additive for lithium secondary batteries, a preparation method thereof and related battery technology fields. Background technique [0002] Since the first commercial lithium secondary battery products came out in the early 1990s, lithium secondary batteries have been widely used in portable electronic products due to their high capacity, high voltage platform, long life and high safety. With the depletion of fossil energy and global warming and other issues related to human survival and development becoming increasingly prominent, people's demand for clean energy continues to expand, and the resulting new energy industry has extremely huge development prospects and market size. It is generally expected that lithium secondary batteries will play a big role in this industry, especially the application prospects in large-scale energy storage equipmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/058
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 刘兆平周旭峰秦志鸿
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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