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Lithium ion battery aqueous anode slurry and preparation method thereof

A lithium-ion battery and positive electrode slurry technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor consistency of water-based positive electrode slurry, difficulty in uniform dispersion of solid substances, poor battery cycle performance, etc., to achieve capacity The effect of good cycle performance, good consistency and low production cost

Active Publication Date: 2014-02-12
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention solves the problems of poor consistency and stability of the water-based positive electrode slurry in the prior art and poor cycle performance of the produced battery, and provides a kind of low environmental pollution, low production cost, good consistency, high stability, and is not easy to use. Settled lithium-ion battery water-based positive electrode slurry, and the lithium-ion battery capacity and cycle performance made by using the lithium-ion battery water-based positive electrode slurry
[0008] The invention also provides a preparation method of water-based positive electrode slurry for ion batteries. The preparation method has simple process steps, strong feasibility, is suitable for large-scale industrial production, and solves the problems of the conductive agent and positive electrode in the existing preparation method of water-based positive electrode slurry. Solid substances such as active substances are difficult to disperse uniformly and are prone to agglomeration. The resulting aqueous cathode slurry has poor consistency, low stability and prone to sedimentation

Method used

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  • Lithium ion battery aqueous anode slurry and preparation method thereof
  • Lithium ion battery aqueous anode slurry and preparation method thereof
  • Lithium ion battery aqueous anode slurry and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Premix preparation: Weigh the positive electrode active material, carbon nanotubes, conductive agent, water-based binder and deionized water according to the ratio. The specific ratio of each component is shown in Table 1. The specific ratio of the water-based binder is The composition is shown in Table 2. Add deionized water and water-based binder accounting for 60% of the total mass of deionized water into a planetary slurry mixer and stir at a low speed for 30 minutes to obtain a premixed liquid. The speed of low-speed stirring is 25r / min for revolution and 500r / min for rotation. min.

[0037] (2) Preparation of conductive glue: add carbon nanotubes and conductive agent to the premixed solution, and stir at high speed for 60 minutes to obtain conductive glue. The speed of high-speed stirring is 50r / min for revolution and 2500r / min for rotation.

[0038] (3) Primary dispersion: Grind the conductive glue solution in a colloid mill to a fineness of 6 μm.

[0039] (...

Embodiment 2

[0047] (1) Premix preparation: Weigh the positive electrode active material, carbon nanotubes, conductive agent, water-based binder and deionized water according to the ratio. The specific ratio of each component is shown in Table 1. The specific ratio of the water-based binder is The composition is shown in Table 2. Add deionized water and water-based binder accounting for 70% of the total mass of deionized water into a planetary slurry mixer and stir at a low speed for 20 minutes to obtain a premixed liquid. The speed of low-speed stirring is 50 r / min in revolution and 700 in rotation. r / min.

[0048] (2) Preparation of conductive glue: add carbon nanotubes and conductive agent to the premixed solution, and stir at high speed for 100 minutes to obtain conductive glue. The speed of high-speed stirring is 20r / min for revolution and 1800r / min for rotation.

[0049] (3) Primary dispersion: Grind the conductive adhesive solution in a sander to a fineness of 10 μm.

[0050] (4) S...

Embodiment 3

[0057] (1) Premix preparation: Weigh the positive electrode active material, carbon nanotubes, conductive agent, water-based binder and deionized water according to the ratio. The specific ratio of each component is shown in Table 1. The specific ratio of the water-based binder is The composition is shown in Table 2. Add deionized water and water-based binder accounting for 80% of the total mass of deionized water into a planetary slurry mixer and stir at a low speed for 10 minutes to obtain a premixed solution. The speed of low-speed stirring is 20 r / min for rotation and 1000 r for revolution. / min.

[0058] (2) Preparation of conductive glue: add carbon nanotubes and conductive agent to the premixed solution, and stir at high speed for 120 minutes to obtain conductive glue. The speed of high-speed stirring is 30r / min for revolution and 2000r / min for rotation.

[0059] (3) Primary dispersion: Grind the conductive glue solution in a colloid mill to a fineness of 5 μm.

[0060...

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Abstract

The invention discloses a lithium ion battery aqueous anode slurry consisting of the following components in percentage by weight: 40-50% of anode active material, 1-10% of carbon nanotube, 0-5% of conductive agent, 1-3% of aqueous adhesive and 40-50% of de-ionized water. Furthermore, the invention discloses a preparation method of the lithium ion battery aqueous anode slurry, and the preparation method mainly comprises the following steps: (1) preparing a premix liquid; (2) preparing a conductive adhesive liquid; (3) dispersing for the first time; (4) dispersing for the second time; (5) defoaming and standing. The preparation method is simple in processing step, strong in feasibility and suitable for mass industrial production; the prepared lithium ion battery is excellent in both capacity and circulating performance, and can be used for effectively solving the problems of an existing aqueous anode slurry preparation method which has difficulty in uniformly dispersing the conductive agent, the anode active material and other solid materials and is high in possibility of aggregation, relatively poor in consistency of the prepared aqueous anode slurry, not high in stability and easy to settle.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium ion battery slurry, in particular to a lithium ion battery aqueous positive electrode slurry and a preparation method thereof. Background technique [0002] In recent years, due to the pressure of environmental pollution and energy shortage, countries are forced to find new green, environmentally friendly and sustainable energy sources. The green, high-energy and environmentally friendly lithium-ion battery that appeared in the 1990s has become one of the most eye-catching power sources due to its high energy density, long cycle life, and high operating voltage. [0003] The positive electrode is the most important part of the lithium-ion battery, which determines the core electrochemical performance of the battery. The lithium-ion battery cell requires the positive electrode to have excellent electrical conductivity. At present, battery manufacturers are adding conductive agents s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/136H01M4/62H01M4/1391H01M4/1397
CPCY02E60/122H01M4/622H01M4/625H01M10/0525Y02E60/10
Inventor 李广帅吴晨琰吴波涛朱修峰
Owner WANXIANG 123 CO LTD
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