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Battery electrode splice, preparation thereof, and battery prepared by the electrode splice

A battery electrode and electrode sheet technology, applied in the direction of electrode manufacturing, secondary batteries, active material electrodes, etc., to achieve the effects of good machinability, excellent toughness, and good cycle stability

Inactive Publication Date: 2009-07-15
SHENZHEN CAPCHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Among all the measures that can improve the performance of lithium-ion batteries, improving the electrode material of the battery is the main means of utilization. At present, new electrode materials have not been discovered by people. How to use technological means to improve the performance of batteries is considered by most researchers. topic

Method used

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  • Battery electrode splice, preparation thereof, and battery prepared by the electrode splice
  • Battery electrode splice, preparation thereof, and battery prepared by the electrode splice

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Taking LiCol / 3Nil / 3Mnl / 3O2 as the research object, the specific preparation method of this battery electrode sheet includes the following steps:

[0046] The first step: 200g LiCo 1 / 3 Ni 1 / 3 mn 1 / 3 o 2 With 20g acetylene black conductive agent, evenly dispersed in 300g N-methylpyrrolidone (NMP) solvent to prepare LiCo 1 / 3 Ni 1 / 3 mn 1 / 3 o 2 - conductive agent mixture.

[0047] Step 2: Add 20g of polyvinylidene fluoride (PVDF) binder to mix and make slurry, stir at a high speed of 4000 rpm, stir for 10 minutes every time, stop for 10 minutes in the middle, and stir at high speed for no less than 2 hours. The entire slurry was thoroughly mixed and the viscosity of the slurry was 560 centipoise (C.P.S.).

[0048] Step 3: Coat the prepared slurry on a coating machine, let it stand for 1 hour, and then dry it. The dry thickness of the electrode sheet is controlled between 60 μm and 120 μm.

[0049] Step 4: Use a rolling machine to press the prepared electrode sheet t...

Embodiment 2

[0051] Take LiNi 0.8 co 0.15 al 0.05 o 2 As the research object, the specific preparation method of this battery electrode sheet includes the following steps:

[0052] The first step: 200g LiNi 0.8 co 0.15 al 0.05 o 2 With 12g acetylene black conductive agent, uniformly dispersed in 200g N-methylpyrrolidone (NMP) solvent to prepare LiNi0.8 co 0.15 al 0.05 o 2 - conductive agent mixture.

[0053] Step 2: Add 18g polyvinylidene fluoride (PVDF) binder to mix and make slurry, stir at a high speed of 4000 rpm, stir for 10 minutes every time, stop for 10 minutes in the middle, and stir at high speed for no less than 2 hours. The whole slurry is fully mixed evenly, and the viscosity of the slurry is 520C.P.S.

[0054] Step 3: Coat the prepared slurry on a coating machine, let it stand for 1 hour, and then dry it. The dry thickness of the electrode sheet is controlled between 60 μm and 120 μm.

[0055] Step 4: Use a rolling machine to press the prepared electrode sheet to ...

Embodiment 3

[0057] LiCoO 2 As the research object, the specific preparation method of this battery electrode sheet includes the following steps:

[0058] The first step: 200g LiCoO 2 and 15g acetylene black conductive agent, uniformly dispersed in 200g N-methylpyrrolidone (NMP) solvent to prepare LiCoO 2 - conductive agent mixture.

[0059] Step 2: Add 20g of polyvinylidene fluoride (PVDF) binder to mix and make slurry, stir at a high speed of 4000 rpm, stir for 10 minutes every time, stop for 10 minutes in the middle, and stir at high speed for no less than 2 hours. The whole slurry is fully mixed evenly, and the viscosity of the slurry is 480C.P.S.

[0060] Step 3: Coat the prepared slurry on a coating machine, let it stand for 1 hour, and then dry it. The dry thickness of the electrode sheet is controlled between 60 μm and 120 μm.

[0061] Step 4: Use a rolling machine to press the prepared electrode sheet to a porosity of about 35%.

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Abstract

The invention relates to a lithium ion battery and its preparing method, especially to a battery slice with good mechanical property, smooth electrochemistry process and good cycling stability and a preparation method thereof and a battery made thereby. The battery electrode slice comprises an afflux medium and a coating layer containing an electrode active matter and an auxiliary material, wherein the electrode active matter is distributed in a state that the granularity and the content are gradually decreasing from the afflux medium to outside in the coating layer. The preparation method comprises: (1) preparing a mixture of the electrode active matter and the auxiliary; (2) adding an adhesive, mixing uniformly and pulping; (3) coating the obtained slurry on the afflux medium to form the coating layer, enabling the coating layer internal to form the active matter gradient distribution through sedimentation and drying; (4) pressing the obtained electrode slice by a roller press. The invention also relates to the battery made by the battery slice from the invention.

Description

technical field [0001] The invention relates to a lithium ion battery and a preparation method thereof, in particular to a battery electrode sheet with good mechanical properties, smooth electrochemical process and good cycle stability, a preparation method thereof and a battery made of the same. Background technique [0002] Based on its superior performance, lithium-ion batteries represent the development trend of batteries for portable electronic products in the future. The market capacity has maintained 100% growth for many years since its inception. Lithium-ion batteries have the advantages of high working voltage, high volume and weight energy density, long life, low self-discharge rate, no memory effect, and little pollution to the environment. They have been widely used in mobile communication equipment, notebook computers, digital cameras, digital cameras etc. With the gradual intensification of the energy crisis and the enhancement of public awareness of environme...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/04H01M10/36H01M10/40
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 郑洪河邓永红毛玉华覃九三
Owner SHENZHEN CAPCHEM TECH
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