Positive slurry of lithium ion battery as well as preparation method and application of positive slurry of lithium ion battery

A lithium-ion battery and positive electrode slurry technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of unsuitable mass production, complex mixing process, and high proportion of graphene, and achieve excellent charge-discharge cycle life and improve The effect of volume specific capacity and large specific surface area

Inactive Publication Date: 2015-02-04
SHENZHEN MOTTCELL NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The resulting LiNi 0.8 co 0.15 al 0.05 o 2 – Graphene composite is mixed with carbon black and NMP containing polyvinylidene fluoride (PVDF) to prepare positive electrode slurry. The specific capacity of the obtained positive electrode slurry is as high as 180mAh / g. However, this method requires high equipment, and graphene It has a high proportion and a large amount in the positive electrode slurry, and needs to use isopropanol as a dispersant. The mixing process is relatively complicated and the cost is high. It is not suitable for industrial mass production.

Method used

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  • Positive slurry of lithium ion battery as well as preparation method and application of positive slurry of lithium ion battery
  • Positive slurry of lithium ion battery as well as preparation method and application of positive slurry of lithium ion battery
  • Positive slurry of lithium ion battery as well as preparation method and application of positive slurry of lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0056] First add 625g of solvent and 15g of oily binder polyvinylidene fluoride (PVDF) into a high-speed mixer at a stirring speed of 3000r / min for 2 hours to obtain mixture A. While stirring, continue to add 15g of conductive agent to mixture A slowly and stir for 2 hours at a stirring speed of 3000r / min, using a water bath to control the reaction temperature at 25°C to obtain mixture B. Then slowly add 800g of nickel-cobalt-lithium-aluminate powder into the mixture B, and slowly add in 2 times during the addition. The stirring rate is 3000r / min, stirring for 1.5 hours, and slowly adding oxalic acid during the stirring until the pH value of the slurry is 8. Add thiourea (CH4N2S) and transition metal compound (Ni(Co)4) to the slurry by 5% of the total amount. Coat the above-mentioned positive electrode slurry on the aluminum foil current collector, use single-sided or double-sided coating during the coating process, and bake in a 15-meter oven at a baking temperature of 100 °...

Embodiment 2

[0062] Example 2: First, 610 g of solvent and 20 g of oily binder polyvinylidene fluoride (PVDF) were added to a high-speed mixer at a stirring speed of 4000 r / min for 3 hours to obtain mixture A. While stirring, continue to add 20g of conductive agent slowly to mixture A and stir for 3 hours at a stirring speed of 4000r / min, using a water bath to control the reaction temperature at 25°C to obtain mixture B. Subsequently, 1000 g of nickel-cobalt-lithium-aluminate powder was slowly added to the mixture B, and slowly added in 3 times during the addition. The stirring rate is 4000r / min, stirring for 3 hours, and slowly adding oxalic acid during the stirring until the pH value of the slurry is 9. Add thiourea (CH4N2S) and transition metal compound (Ni(Co)4) to the slurry by 8% of the total amount. Coat the above-mentioned positive electrode slurry on the aluminum foil current collector, use single-sided or double-sided coating during the coating process, and bake in a 15-meter ov...

Embodiment 3

[0063] Example 3: 590g of solvent and 27.7g of oily binder polyvinylidene fluoride (PVDF) were first added to a high-speed mixer at a stirring speed of 5000r / min for 4 hours to obtain mixture A. While stirring, continue to add 27.7g of conductive agent to mixture A slowly and stir for 4 hours at a stirring speed of 5000r / min, using a water bath to control the reaction temperature at 25°C to obtain mixture B. Then slowly add 1200g of nickel-cobalt-lithium-aluminate powder into the mixture B, and slowly add in 4 times during the addition. The stirring rate is 5000r / min, stirring for 1.5 hours, and slowly adding oxalic acid during the stirring until the pH value of the slurry is 9.5. Add thiourea (CH4N2S) and transition metal compound (Ni(Co)4) to the slurry by 10% of the total amount. Coat the above-mentioned positive electrode slurry on the aluminum foil current collector, use single-sided or double-sided coating during the coating process, and bake in a 15-meter oven at a bak...

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Abstract

The invention provides positive slurry of a lithium ion battery as well as a preparation method and application of the positive slurry of the lithium ion battery. The preparation method of the positive slurry of the lithium ion battery comprises the following steps: (1) uniformly agitating and mixing a solvent and an oily binding agent to obtain a mixture A; (2) adding graphene into the mixture A at 25-40 DEG C and agitating uniformly to obtain a mixture B; and (3) adding nickel cobalt lithium aluminate powder into the mixture B; agitating to obtain the positive slurry; and during the agitating period, adding oxalic acid to adjust the pH value of the slurry to 8-9.5. The battery prepared from the positive slurry of the lithium ion battery has the excellent charging/discharging circulating service life and has the high power and safety performance. The battery prepared by the invention is applicable to the fields of hybrid electric vehicles, telecommunication networks, outer spaces, defending equipment and the like.

Description

technical field [0001] The invention relates to a battery preparation method, in particular to a lithium ion battery positive electrode slurry, a preparation method and application thereof. Background technique [0002] The positive electrode is the most important part of the lithium-ion battery, which determines the core electrochemical performance of the battery. However, the conductivity of cathode materials is usually poor, and the selection of materials with high rate performance only means that the ion conduction inside the cathode material particles is relatively good, and the conduction outside the particles depends on the conductive agent and the distribution of the conductive agent on the surface of the positive electrode particles. The optimal distribution of the conductive agent needs to be achieved through the preparation process of the positive electrode slurry. [0003] Graphene is a two-dimensional honeycomb lattice structure carbonaceous material composed o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/1393H01M4/525
CPCH01M4/133H01M4/1393H01M4/525Y02E60/10
Inventor 陈明军
Owner SHENZHEN MOTTCELL NEW ENERGY TECH CO LTD
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