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Anode slurry of lithium secondary battery, anode and battery including the same

A cathode slurry, secondary battery technology, applied in secondary batteries, battery electrodes, active material electrodes, etc., can solve the problems of limited performance improvement, low capacity and discharge ratio, and high battery internal resistance, to improve performance, High capacity and discharge ratio, lower surface tension effect

Active Publication Date: 2011-01-12
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The improvement of the performance of lithium-ion secondary batteries by using these traditional surfactants is still limited, the internal resistance of the battery is still high, and the capacity and discharge rate are still low

Method used

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  • Anode slurry of lithium secondary battery, anode and battery including the same
  • Anode slurry of lithium secondary battery, anode and battery including the same
  • Anode slurry of lithium secondary battery, anode and battery including the same

Examples

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preparation example Construction

[0034] Various methods known in the art can be used for the preparation method of the positive electrode and the negative electrode.

[0035] The composition of the electrolyte solution is well known to those skilled in the art. Generally speaking, the electrolyte solution contains a non-aqueous solvent and an electrolyte dissolved in the non-aqueous solvent. The content of the electrolyte is generally 0.5-2.0 mol / l.

[0036] The kind of described non-aqueous solvent is well known to those skilled in the art, can use various known non-aqueous solvents, preferably use the mixed solvent of chain ester and cyclic acid ester; Described chain ester can be Dimethyl carbonate, diethyl carbonate, ethyl propyl carbonate, diphenyl carbonate, methyl acetate, ethyl acetate, methyl propionate, ethyl propionate, dimethoxyethane, diethoxy ethane and its chain organic esters containing fluorine, sulfur and unsaturated bonds or a mixture thereof; the cyclic esters can be selected from ethylene c...

Embodiment 1

[0041] 1. Preparation of positive electrode slurry for lithium-ion secondary batteries

[0042] Add 4000g of solvent N-methylpyrrolidone (NMP) and 10g of ethylene bis(octadecyldimethylammonium chloride) (Henan Province Daochun Chemical Technology Co., Ltd.) to the container with stirrer.

[0043] Stir in the container for 5 minutes, then add 400g conductive agent acetylene black and 300g binder polyvinylidene fluoride (PVDF) powder, stir for 5 minutes to obtain conductive agent slurry, then add 10kg lithium cobaltate and stir for 20 minutes to prepare It can be used as positive electrode slurry for lithium ion secondary battery.

[0044] 2. Preparation of positive electrode

[0045] The positive electrode slurry of the lithium-ion secondary battery obtained above is uniformly coated on the aluminum foil by drawing the slurry, dried, pressed into sheets, and cut into positive electrode sheets of 490 × 43 mm, and each positive electrode sheet contains 7.8 grams of cobalt respec...

Embodiment 2

[0054] Lithium-ion secondary battery A2 was prepared in the manner described in Example 1, except that when preparing the positive electrode slurry of the lithium-ion secondary battery, the amount of gemini surfactant added was 30 g.

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Abstract

The invention provides positive electrode slurry of a lithium-ion secondary battery. The positive electrode slurry contains a positive electrode active material, a conductive agent, a binding agent, a surfactant and a solvent, wherein, the surfactant is the gemini surfactant. The invention also provides a positive electrode which is prepared by adopting the positive electrode slurry and the lithium-ion secondary battery containing the positive electrode. The positive electrode slurry of the lithium-ion secondary battery can greatly improve the performance of the battery, compared with the lithium-ion secondary battery which is obtained by adopting the traditional surfactant to carry out the pre-dispersion to the conductive agent, the performance of the invention is much higher, such as, the internal resistance of the battery is much lower, the capacity and the discharge rate of the battery are much higher.

Description

technical field [0001] The invention relates to a positive electrode slurry of a lithium ion secondary battery, and also relates to a positive electrode prepared from the positive electrode slurry, and a lithium ion secondary battery including the positive electrode. Background technique [0002] In the process of manufacturing lithium-ion secondary batteries, when preparing positive electrode slurry, the positive electrode active material, conductive agent, binder and solvent are usually mixed uniformly according to a certain ratio, and then coated on the current collector, after drying, After cutting, it is made into a positive electrode sheet of a lithium-ion secondary battery. [0003] Since the particles of the conductive agent are small and have poor wettability, it is not easy to disperse uniformly in the positive electrode slurry, and it is easy to agglomerate. If the conductive agent is not well dispersed in the positive electrode slurry, the conductive agent in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M4/62H01M4/02
CPCY02E60/122Y02E60/10
Inventor 吴长伟雷磊王栋曾诚
Owner BYD CO LTD
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