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Graphene flexible electrode plate and preparation method and application thereof

A flexible technology for electrode sheets and olefins, applied in electrode manufacturing, electrode rolling/calendering, battery electrodes, etc., can solve the problem of unstable electrochemical properties of flexible composite electrode materials, applications that cannot be mass-produced, and insufficient mechanical strength of electrode sheets To achieve good coating or loading effect, improve transmission efficiency and capacity utilization, and increase effective active load

Inactive Publication Date: 2019-08-13
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the traditional method of preparing composite electrode materials usually uses the prepared graphene powder and then mixes it with the active material, and then prepares it through suction filtration, ball milling and other processes. The electrochemical performance of the prepared flexible composite electrode material is unstable, and the stress concentration area in the pole piece causes the mechanical strength of the pole piece to be insufficient, and the molding is difficult, so it cannot be applied in batches.

Method used

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  • Graphene flexible electrode plate and preparation method and application thereof
  • Graphene flexible electrode plate and preparation method and application thereof
  • Graphene flexible electrode plate and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0048] Step 1: Mix expanded graphite, polyvinylidene fluoride and NMP according to the mass ratio of 1:0.1:98.9 and pre-disperse. The expansion ratio of expanded graphite is 350 times. The pre-dispersion adopts mechanical stirring at a speed of 2000rpm, and the pre-dispersion time is 30 minutes ;

[0049] Step 2: the predispersion liquid obtained in step 1 is according to the expanded graphite solid mass: the active substance mass ratio is 0.02:1, and the active substance is added to the predispersion liquid and homogenized, and the active substance is a composite material of graphite and sulfur, homogenized The mass pressure is 25MPa, and the number of cycles is 4 times. After homogenization, pass through a 200-mesh sieve after being refined by sand milling (the number of times of sand milling is 2 times) to obtain a graphene composite active material dispersion;

[0050] Step 3: press graphene composite active material solid mass: super conductive carbon black: polytetraflu...

Embodiment 2

[0055] Step 1: Pre-disperse the expanded graphite, polyvinylidene fluoride-hexafluoropropylene and NMP according to the mass ratio of 2:0.3:97.7, the expansion rate of the expanded graphite is 400 times, the pre-dispersed equipment is a sand mill, and the speed is 1000rpm, The number of times of sanding is 3 times;

[0056] Step 2: The predispersion liquid obtained in step 1 is according to the expanded graphite solid mass: the active material mass ratio is 0.1:1, and the active material is added to the predispersion liquid and homogenized. The active material is iron cobalt lithium manganese oxide material, homogeneous The mass pressure is 30MPa, and the number of cycles is 6 times. After homogenization, pass through a 200-mesh sieve after being refined by sand milling (3 times of sand milling times), to obtain a graphene composite active material dispersion;

[0057] Step 3: According to the solid mass of the graphene composite active material: carbon nanotubes: binder (the...

Embodiment 3

[0060] Step 1: Mix expanded graphite, carboxymethyl cellulose and water according to the mass ratio of 3:0.5:96.5 and pre-disperse. The expansion ratio of expanded graphite is 600 times. When pre-dispersing, first pass mechanical stirring at a speed of 3000 rpm for 15 minutes , and then sanded twice by a sand mill at a speed of 700rpm;

[0061] Step 2: the pre-dispersed liquid obtained in step 1 is added according to the solid quality of expanded graphite: the mass ratio of active material is 0.05:1, and the active material is added and homogenized, the active material is graphite, the homogeneous pressure is 50MPa, and the number of cycles is 7 times . After homogenization, pass through a 100-mesh sieve after being refined by sand milling (the number of times of sand milling is 2 times) to obtain a graphene composite active material dispersion;

[0062] Step 3: by graphene composite active material solid mass: super conductive carbon black: binder (polytetrafluoroethylene an...

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Abstract

The invention discloses a graphene flexible electrode plate and a preparation method and application thereof. The graphene flexible electrode plate comprises a graphene composite active material, an auxiliary conductive agent and a binder, wherein the mass ratio of the graphene composite active material to the auxiliary conductive agent to the binder is (80-97): (1.5-10): (1.5-10); the graphene composite active material comprises graphene and an active substance, wherein the mass ratio of the graphene to the active substance is 0.02-0.1: 1. The preparation method comprises the following steps:mixing expanded graphite, a dispersing agent and a solvent, and performing pre-dispersing to obtain pre-dispersion liquid; mixing the pre-dispersion liquid and the active substance, and carrying outhomogenization treatment, sanding and sieving to obtain graphene composite active material dispersion liquid; mixing the graphene composite active material dispersion liquid with the auxiliary conductive agent and the binder for granulation, and performing repeated hot rolling to obtain the graphene flexible electrode plate. The preparation method is simple, the electrode resistance can be obviously reduced, and the electrode active material loading capacity and the capacity utilization rate are improved.

Description

technical field [0001] The invention relates to a graphene flexible electrode sheet and a preparation method and application thereof, belonging to the technical field of batteries. Background technique [0002] As the most efficient energy storage device at present, lithium-ion batteries have been widely used in many fields such as consumer electronics, drones and electric vehicles. Looking at the application scenarios of lithium-ion batteries, they can be classified into the following three categories according to requirements: (1) Energy-type lithium-ion batteries for portable electronic devices; (2) High-energy, high-power lithium-ion batteries for electric vehicles and military equipment; (3) Long-life lithium-ion batteries for energy storage devices. Flexible electrodes have unique advantages such as high specific energy and structural flexibility, and can be applied in the field of wearable and portable power sources. Carbon materials are used as electrode conductors...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139H01M4/04H01M4/36H01M4/62H01M10/0525
CPCH01M4/0433H01M4/0435H01M4/13H01M4/139H01M4/366H01M4/623H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 王晨彭思侃燕绍九南文争王楠
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS