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Method of preparing battery electrodes

a battery electrode and electrode technology, applied in the field of lithiumion batteries, can solve the problems of pvdf only soluble in some specific, affecting the performance of electrodes,

Inactive Publication Date: 2017-07-20
GRST INTERNATIONAL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent is about using different solutions to prevent particles from sticking together and promoting the separation of particles. These solutions contain substances called dispersing agents, which help to lower the surface tension between liquids and solids. The patent suggests using different types of surfactants as dispersing agents. The technical effect of this patent is to improve the process of separating and dispersing particles in different applications.

Problems solved by technology

However, PVDF can only dissolve in some specific organic solvents such as N-Methyl-2-pyrrolidone (NMP) which requires specific handling, production standards and recycling of the organic solvents in an environmentally-friendly way.
This will incur significant costs in the manufacturing process.
However, CMC and SBR are generally limited to anode applications.
However, the method is complicated, involving measurements of the zeta potential of the active electrode material and the conductive additive material, and isoelectric point (IEP) of the active electrode material and the conductive additive material.
However, this method does not provide any data for evaluating the electrochemical performance of the electrodes prepared by this method.

Method used

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  • Method of preparing battery electrodes
  • Method of preparing battery electrodes

Examples

Experimental program
Comparison scheme
Effect test

example 1

A) Pre-treatment of Active Battery Electrode Material

[0180]A particulate cathode material LiNi0.33Mn0.33Co0.33O2 (NMC333) (obtained from Xiamen Tungsten CO. Ltd., China) was added to a stirring solution containing 50% deionized water and 50% ethanol at room temperature to form a suspension having a solid content of about 35% by weight. The pH of the suspension was measured using a pH meter and the pH was about 7. The suspension was further stirred at room temperature for 5 hours. Then the suspension was separated and dried by a 2.45 GHz microwave dryer (ZY-4HO, obtained from Zhiya Industrial Microwave Equipment Co., Ltd., Guangdong, China) at 750 W for 5 minutes to obtain a pre-treated active battery electrode material.

B) Preparation of Positive Electrode Slurry

[0181]A positive electrode slurry was prepared by mixing 91 wt. % pre-treated active battery electrode material, 4 wt. % carbon black (SuperP; Timcal Ltd, Bodio, Switzerland), 4 wt. % polyacrylonitrile (PAN) (LA 132, Chengdu ...

example 2

Assembling of Pouch-Type Battery

[0185]After drying, the resulting cathode film and anode film of Example 1 were used to prepare the cathode and anode respectively by cutting into individual electrode plates. A pouch cell was assembled by stacking the cathode and anode electrode plates alternatively and then packaged in a case made of an aluminum-plastic laminated film. The cathode and anode electrode plates were kept apart by separators and the case was pre-formed. An electrolyte was then filled into the case holding the packed electrodes in high-purity argon atmosphere with moisture and oxygen content6 (1 M) in a mixture of ethylene carbonate (EC), ethyl methyl carbonate (EMC) and dimethyl carbonate (DMC) in a volume ratio of 1:1:1. After electrolyte filling, the pouch cells were vacuum sealed and then mechanically pressed using a punch tooling with standard square shape.

Electrochemical Measurements of Example 2

I) Nominal Capacity

[0186]The cell was tested galvanostatically at a cur...

example 3

A) Pre-Treatment of Active Battery Electrode Material

[0188]A particulate cathode material LiMn2O4 (LMO) (obtained from HuaGuan HengYuan LiTech Co. Ltd., Qingdao, China) was added to a stirring 7 wt. % solution of acetic acid in water (obtained from Aladdin Industries Corporation, China) at room temperature to form a suspension having a solid content of about 50% by weight. The pH of the suspension was measured using a pH meter and the pH was about 6. The suspension was further stirred at room temperature for 2.5 hours. Then the suspension was separated and dried by a 2.45 GHz microwave dryer at 750 W for 5 minutes to obtain a pre-treated active battery electrode material.

B) Preparation of Positive Electrode Slurry

[0189]Carbon nanotube (NTP2003; Shenzhen Nanotech Port Co., Ltd., China) (25 g) was pretreated in 2 L of an alkaline solution containing 0.5 wt. % NaOH for about 15 minutes and then washed by deionized water (5 L). The treated carbon nanotube was then dispersed in deionized...

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Abstract

Provided herein is a method for preparing a battery electrode based on an aqueous slurry. The method disclosed herein has the advantage that an aqueous solvent can be used in the manufacturing process, which can save process time and facilities by avoiding the need to handle or recycle hazardous organic solvents. Therefore, costs are reduced by simplifying the total process. In addition, the batteries having the electrodes prepared by the method disclosed herein show impressive energy retention.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This is a continuation of the International Application No. PCT / CN2016 / 109723, filed Dec. 13, 2016, which claims priority to U.S. Provisional Patent Application No. 62 / 279,841, filed Jan. 18, 2016, all of which are incorporated herein by reference in their entirety.FIELD OF THE INVENTION[0002]This invention relates to lithium-ion batteries in the application of sustainable energy area. More particularly, this invention relates to the use of aqueous-based slurries for preparing battery electrodes.BACKGROUND OF THE INVENTION[0003]Lithium-ion batteries (LIBs) have attracted extensive attention in the past two decades for a wide range of applications in portable electronic devices such as cellular phones and laptop computers. Due to rapid market development of electric vehicles (EV) and grid energy storage, high-performance, low-cost LIBs are currently offering one of the most promising options for large-scale energy storage devices.[0004]In ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01M4/04H01M4/62H01M10/0525H01M4/485H01M4/131H01M4/1391
CPCH01M4/0404H01M4/131H01M4/1391H01M10/0525H01M2004/028H01M4/622H01M4/625H01M4/0409H01M4/0419H01M4/485H01M4/04H01M4/139H01M4/623H01M4/1397H01M4/0471Y02E60/10H01M4/366H01M4/505H01M4/525H01M4/483H01M4/502H01M4/523H01M4/1393H01M4/5825
Inventor SHEN, PEIHUAWONG, SING HUNG ERIC
Owner GRST INTERNATIONAL LTD
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