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Conducting-polymer dipped and coated lithium-ion battery composite-electrode material and preparation method thereof

A technology of lithium-ion batteries and conductive polymers, applied in battery electrodes, electrode manufacturing, lithium batteries, etc., can solve problems such as difficult mass production and troublesome process steps, and achieve high specific capacity, simple and clear steps, and long cycle life Effect

Inactive Publication Date: 2012-06-27
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Or through the electrochemical polymerization of EDOT monomer, the process steps are troublesome, and it is difficult to mass produce and promote to industrialization (J. Power Sources, 157 (2006) 457-463)

Method used

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  • Conducting-polymer dipped and coated lithium-ion battery composite-electrode material and preparation method thereof
  • Conducting-polymer dipped and coated lithium-ion battery composite-electrode material and preparation method thereof
  • Conducting-polymer dipped and coated lithium-ion battery composite-electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] LiCoO 2 / PEDOT:PSS

[0034] Adjust the pH value of the PEDOT:PSS aqueous solution with ammonia water to be neutral (pH=6~9). 2g LiCoO 2 The powder was slowly added to an aqueous solution of PEDOT:PSS (10 mL), ultrasonically dispersed for 30 min, stirred for 2 hours, filtered, dried at 80°C for 3 hours, thoroughly ground, and then dried at 120°C for 2 hours. After fully grinding the prepared material, mix it with acetylene black and PVDF in a ratio of 80:10:10, and dry it at 80°C for 24 hours after coating to prepare LiCoO 2 electrode sheet. With lithium sheet as counter electrode, polyethylene film as diaphragm, 1MLiPF 6 / EC:DEC:DMC (v:v:v=1:1:1) conducts constant current charge and discharge tests for electrolyte assembled button cells (CR2025), with a voltage range of 3.0-4.2V.

Embodiment 2

[0036] LiNi 0.5 mn 1.5 o 4 / PEDOT:PSS

[0037] Adjust the pH value of the PEDOT:PSS aqueous solution with ammonia water to be neutral (pH=6~9). 0.5g LiNi 0.5 mn 1.5 o 4 Slowly add the powder into PEDOT:PSS aqueous solution (2mL), ultrasonically disperse for 30min, settle naturally, centrifuge, and then dry at 60℃~120℃ for 24 hours. After fully grinding the prepared material, mix it with acetylene black and PVDF in a ratio of 80:10:10, and dry it at 80°C for 24 hours after coating to prepare LiNi 0.5 mn 1.5 o 4 electrode. With a lithium sheet as the counter electrode, a polyethylene film as the separator, and 1M LiPF 6 / EC:DEC (v:v=1:1) conducts constant current charge and discharge tests for electrolyte assembled button cells (CR2025), and the voltage range is 3.5-5.0V.

Embodiment 3

[0039] LiMn 2 o 4 / PEDOT:PSS

[0040] Adjust the pH value of the PEDOT:PSS aqueous solution with ammonia water to be neutral (pH=6~9). 0.5g LiMn 2 o 4 Slowly add the powder into PEDOT:PSS aqueous solution (2mL), ultrasonically disperse for 30min, settle naturally, centrifuge, and then dry at 60℃~120℃ for 24 hours. After fully grinding the prepared material, mix it with acetylene black and PVDF according to the ratio of 80:10:10, and dry it at 80°C for 24 hours after coating to prepare LiMn 2 o 4 electrode. With a lithium sheet as the counter electrode, a polyethylene film as the separator, and 1M LiPF 6 / EC:DEC (v:v=1:1) conducts constant current charge and discharge tests for electrolyte-assembled button batteries (CR2025), with a voltage range of 3.5-4.3V.

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Abstract

The invention provides a conducting-polymer dipped and coated lithium-ion battery composite-electrode material and a preparation method thereof. A high-polymer conducting polymer is coated on the lithium-ion battery electrode material of the composite electrode material, the conducting polymer is the conducting polymer which is easily dispersed into an aqueous solution, and the aqueous solution of dispersants, such as polystyrolsulfon acid and the like is used as a dispersing medium. The composite electrode material is prepared through the following steps of: dipping a lithium-ion anode material or cathode material into the aqueous solution of the high-polymer conducting polymer, and obtaining the surface-coated lithium-ion battery composite-electrode material through dipping and coating processing. The composite electrode material has cheap preparation raw materials, the surface of the novel composite electrode material is uniformly coated, and the composite electrode material has the advantages of high specific capacity, high charging and discharging efficiency and long cycling life. Compared with the prior art, the preparation method of the composite electrode material has the advantages of simple process, low cost, good effect and green and environment-friendly production process, is easy for industrial popularization and is convenient for large-scale industrialized production.

Description

technical field [0001] The invention relates to the processing field of lithium-ion battery electrode materials, in particular to a lithium-ion battery composite electrode material impregnated and coated with a conductive polymer and a preparation method thereof. technical background [0002] Lithium-ion batteries have the advantages of high open circuit voltage, high energy density, small size, long service life, no memory effect, less pollution, and low self-discharge rate. The most ideal power supply for various portable electronic devices and electric vehicles. [0003] The key technology for the development of high-performance lithium-ion batteries is the research and development of electrode materials. The commonly used cathode materials are LiCoO 2 , LiFePO 4 , LiMn 2 o 4 , LiNi 0.5 mn 1.5 o 4 etc., the negative electrode materials include graphite, Li 4 Ti 5 o 12 etc. Among them, except graphite, other electrode materials have the problem of low electronic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/139
CPCY02E60/12H01M4/38Y02E60/122Y02E60/13H01M4/622H01M4/624H01M10/052H01M4/0416H01M4/366H01G11/48Y02E60/10
Inventor 张灵志王素清赵雪玲赵欣悦
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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