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Method for improving the performance of ternary electrodes by intercalating graphene

A technology of intercalated graphite and ternary electrodes, applied in battery electrodes, electrode manufacturing, hybrid capacitor electrodes, etc., can solve the problems of poor graphene stability, unsatisfactory dispersion effect, and influence on electrical conductivity, and achieve low raw material cost and excellent performance. Discharge performance, the effect of simple preparation process

Active Publication Date: 2020-09-22
XIAMEN KNANO GRAPHENE TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effect of using graphene is not obvious at present
The inventor thinks that this is due to the unsatisfactory dispersion effect of the graphene of the predecessors, and the stability of the dispersed graphene is relatively poor, which affects its electrical conductivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Mix the graphene powder with 50 layers and the active agent at a mass ratio of 1:15, stir and mix at 70°C for 25 minutes, wash with deionized water to remove excess active agent until the washing liquid appears neutral, and filter the obtained The filter residue was washed with methyl ethyl ketone to remove water, and the filter residue filtered by suction again was intercalated graphene. The intercalated graphene was prepared as a dry precursor at 170° C. under vacuum and stirring conditions of 0.1 atmospheric pressure. Stir and mix according to the volume ratio of the precursor to N-methylpyrrolidone as 1:10, and ultrasonically oscillate for 20 minutes to uniformly disperse the intercalated graphene in the N-methylpyrrolidone medium to obtain an intercalated graphene solution.

[0021] Intercalated graphene solution, LiNi 0.5 co 0.2 mn 0.3 o 2 The ternary material and polyvinylidene fluoride are mixed according to the weight ratio of 45:95:4.99, stirred evenly, co...

Embodiment 2

[0025]Mix the graphene powder with 100 layers and the active agent at a mass ratio of 1:25, stir and mix at 95°C for 100 minutes, wash with deionized water to remove excess active agent until the washing liquid appears neutral, and suction filter the obtained The filter residue was washed with methyl ethyl ketone to remove water, and the filter residue filtered by suction again was intercalated graphene. The intercalated graphene was heated at 260° C. under the conditions of vacuum and stirring at 0.05 atmospheric pressure to prepare a dry precursor. Stir and mix according to the volume ratio of the precursor to N-methylpyrrolidone 1:1000, and ultrasonically oscillate for 100 minutes to uniformly disperse the intercalated graphene in the N-methylpyrrolidone medium to obtain an intercalated graphene solution.

[0026] Intercalated graphene solution, LiNi 0.8 co 0.1 mn 0.1 o 2 The ternary material and polyvinylidene fluoride are mixed according to the weight ratio of 100:90:...

Embodiment 3

[0030] Mix the graphene powder with 10 layers and the active agent at a mass ratio of 1:5, stir and mix at 60°C for 10 minutes, wash with deionized water to remove excess active agent until the washing liquid appears neutral, and filter the obtained The filter residue was washed with methyl ethyl ketone to remove water, and the filter residue filtered by suction again was intercalated graphene. The intercalated graphene was heated at 260° C. under a vacuum of 0.02 atmospheric pressure and stirring to prepare a dry precursor. Stir and mix according to the volume ratio of the precursor to N-methylpyrrolidone as 1:5, and ultrasonically oscillate for 5 minutes to uniformly disperse the intercalated graphene in the N-methylpyrrolidone medium to obtain an intercalated graphene solution.

[0031] Intercalated graphene solution, Li 1.01 Ni 0.51 co 0.2 mn 0.3 o 2 The ternary material and polyvinylidene fluoride are mixed according to the weight ratio of 20:98:9.99, stirred evenly,...

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Abstract

The invention relates to a method for improving the performances of a ternary electrode through intercalated graphene. The method comprises the following steps: mixing graphene powder with an activator, and carrying out stirring, washing, suction filtration, vacuum drying and ultrasonic mixing to prepare an intercalated graphene solution; and producing the ternary positive electrode by using the intercalated graphene solution as a conductive agent. The activator is a concentrated nitric acid and hydrogen peroxide mixed solution, and a mass ratio of 65 wt% concentrated nitric acid to 30 wt% hydrogen peroxide is 1:(0.1-0.5). The method has the advantages of low raw material cost, wide sources of raw materials, simple preparation process, simplicity in operation, and short time. The producedsample has an excellent discharge performance, especially has a good discharge cycle performance under a heavy current condition, and lays a solid foundation for industrialization.

Description

technical field [0001] The invention belongs to the technical field of battery electrode material preparation, and relates to a preparation method of a ternary electrode that can be used for lithium batteries, lithium ion batteries, polymer batteries and supercapacitors. [0002] technical background [0003] With the depletion of fossil energy, energy issues have increasingly become a focus of attention. Finding new materials for energy storage has become one of the research hotspots. The lithium-ion battery of the new energy storage system should have the advantages of high voltage, large capacity, no memory effect and long life, and can be widely used in digital products such as mobile phones, digital cameras, notebook computers, and power tools such as electric vehicles and hybrid electric vehicles . [0004] Lithium-ion batteries include positive electrode materials, negative electrode materials, separators, electrolytes, and current collectors. Among them, the positi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M4/1391H01M4/04H01G11/30H01G11/36H01G11/46H01G11/86
CPCY02E60/10
Inventor 童庆松祖国晶张晓红余欣瑞郑思宁陈方园
Owner XIAMEN KNANO GRAPHENE TECH CORP