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Composite electrode materials for high power lithium secondary battery and preparation method thereof

A lithium secondary battery and composite electrode technology, applied in battery electrodes, electrode manufacturing, active material electrodes, etc., can solve problems such as lack of innovation, and achieve the effects of improving high-power discharge capacity, cycle life, and specific energy

Active Publication Date: 2011-03-30
HUBEI HONGRUN HIGH-TECH NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods can improve the high-power discharge performance of these "embedded" electrode materials to a certain extent, but there is still a certain distance from the actual application requirements of high-power applications such as electric vehicles.
In terms of electrode preparation technology, it is still in the traditional method of blending conductive agent, adhesive, and active material to smear and lacks innovation.

Method used

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  • Composite electrode materials for high power lithium secondary battery and preparation method thereof
  • Composite electrode materials for high power lithium secondary battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1 In situ electropolymerization method

[0022] First prepare 100ml 0.02mol / L pyrrole Py propionitrile solution, then add 0.5g carbon-coated lithium iron phosphate C-LiFePO 4 powder, and 0.1 g of supporting electrolyte LiClO 4 , ultrasonically disperse for half an hour to obtain a uniformly dispersed suspension, then place the working electrode and the counter electrode in the suspension, and perform cyclic voltaic in the potential range of 1.3V to 0.1V (relative to the Ag / AgCl reference electrode). An electrochemical polymerization, after 10 minutes of polymerization, a uniform layer of PPy-coated C-LiFePO was obtained on the working electrode 4 The composite film (C-LiFePO 4 / PPy), the mass fraction of PPy is 16% by differential thermal analysis. Directly use the composite membrane as the working electrode, the metal lithium sheet as the counter electrode, and the polypropylene microporous membrane as the diaphragm, and use 1mol / L LiPF 6 / EC-DMC (1:1) s...

Embodiment 2

[0023] Example 2 In situ electropolymerization method

[0024] First configure 100ml of 0.1mol / L aniline ANI in propionitrile solution, then add 1gLiCo 1 / 3 Ni 1 / 3 mn 1 / 3 o 2 powder and 0.2 g of supporting electrolyte LiClO4 , then add 0.05g of surfactant polyethylene oxide, magnetically stir for 1 hour to obtain a uniform suspension, then place the working electrode and counter electrode in the suspension, and apply 0.1mA / cm2 to the working electrode 2 The constant current electrochemical polymerization was carried out at a current density of 100%. After 30 minutes of polymerization, a uniform layer of polyaniline-coated LiCo was obtained on the working electrode. 1 / 3 Ni 1 / 3 mn 1 / 3 o 2 Composite film (LiCo 1 / 3 Ni 1 / 3 mn 1 / 3 o 2 / PANI), it is known that the massfraction of PANI is 35% by differential thermal analysis. Directly use the composite membrane as the working electrode, the metal lithium sheet as the counter electrode, and the polypropylene microporous membr...

Embodiment 3

[0025] Embodiment 3 in situ chemical polymerization method

[0026] Prepare 100ml of 0.01mol / l triphenylamine hydrochloric acid solution with pH=3~5, then add 1gLiMn 2 o 4 Powder and 0.05g of doping agent sodium toluenesulfonate, mechanically stirred to obtain a uniform suspension, at a temperature of 0 to 5 degrees, add 10ml of 0.01mol / L ammonium persulfate (oxidant) solution for oxidative polymerization , reacted for 5 hours under the condition of 0-5 degrees, filtered, washed and dried with deionized water and ethanol several times to obtain polytriphenylamine-coated LiMn 2 o 4 As for the composite electrode material, the mass fraction of polytriphenylamine in the composite material is 3% through differential thermal analysis. Mix the composite material, acetylene black AB, and polytetrafluoroethylene PTFE emulsion uniformly at a ratio of 95:2:3, roll it into a film with a thickness of about 100 μm, and then press it on the aluminum mesh current collector to make a worki...

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Abstract

The invention discloses composite electrode materials for a high power lithium secondary battery and a preparation method thereof. The composite electrode materials take lithium-storage active material as an inner core, conductive polymer as an outer shell, the active material inner core is mainly used for carrying out electrochemical reaction and providing main capacity for a battery, the conductive polymer material is used as a conductive agent and an adhesive when preparing electrodes, and simultaneously provides a certain amount of battery capacity by electrochemical doping and undoping reaction. By using the composite electrode materials for preparing electrodes, adhesive and conductive agent with electrochemical inertia can not be used or be used in a small amount, and the lithium secondary battery based on the composite electrode materials has high specific capacity and fine rate performance.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, material chemistry and chemical power supply products, and specifically relates to a lithium secondary battery composite electrode material and a preparation method thereof. Background technique [0002] With the increasingly widespread application of lithium secondary batteries in portable electronic fields such as mobile phones, laptop computers, and cameras, the advantages of high voltage, high specific energy and long cycle life have attracted the favor of other high-tech application fields. . At present, people are actively developing high-capacity and high-power lithium secondary batteries to meet the application requirements of military, aerospace, electric vehicles and other special occasions. For the application of portable electronic products, improving the specific energy of lithium-ion batteries, reducing costs and improving safety are the development directions. For high-p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/02H01M4/04H01M4/38H01M4/62H01M4/58
CPCY02E60/12Y02E60/10
Inventor 黄云辉袁利霞张五星
Owner HUBEI HONGRUN HIGH-TECH NEW MATERIALS CO LTD
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