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Conducting polymer film and positive pole piece modified by same

A technology of conductive polymers and positive plates, applied in battery electrodes, electrode carriers/current collectors, circuits, etc., can solve the problems of complex preparation process and poor electrochemical performance of positive plates, and improve structural stability and thermal stability. Stability, improved electrochemical performance, uniform thickness effect

Active Publication Date: 2016-12-14
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a conductive polymer film to solve the problems of complex preparation process and poor electrochemical performance of the positive electrode sheet modified by conductive polymer

Method used

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  • Conducting polymer film and positive pole piece modified by same
  • Conducting polymer film and positive pole piece modified by same
  • Conducting polymer film and positive pole piece modified by same

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0056] The positive electrode sheet of this embodiment includes a positive electrode plate formed by a current collector and a positive electrode material layer attached to one side of the current collector, and a conductive polymer film is attached to the outer side of the positive electrode material layer on the positive electrode plate.

[0057] The preparation method of the positive pole piece of the present embodiment comprises the following steps:

[0058] a) Preparation of positive plate: olivine-type pure LiFePO 4 It is the positive electrode active material, acetylene black is the conductive agent, and polytetrafluoroethylene is the binder. According to the mass ratio of the positive electrode active material, the conductive agent and the binder is 80:10:10, mix evenly, and add an appropriate amount of NMP as the solvent A slurry was made, and the slurry was evenly coated on one side surface of an aluminum foil (the thickness of the current collector was 0.02 mm), the...

Embodiment 2

[0064] The positive electrode sheet of this embodiment includes a positive electrode plate formed by a current collector and a positive electrode material layer attached to both sides of the current collector, and a conductive polymer film is attached to the outer side of the positive electrode material layer on the positive electrode plate.

[0065] The preparation method of the positive pole piece of the present embodiment comprises the following steps:

[0066] a) Preparation of positive plate: olivine-type pure LiFePO 4It is the positive electrode active material, acetylene black is the conductive agent, polyvinylidene fluoride is the binder, according to the mass ratio of the positive electrode active material, conductive agent and binder is 89:7:4, mix evenly, and use NMP as the solvent to prepare Form a slurry, and use a coating machine to evenly coat the slurry on both sides of the aluminum foil (the thickness of the current collector is 0.02mm). The coating thickness ...

Embodiment 3

[0072] The positive electrode sheet of this embodiment includes a positive electrode plate formed by a current collector and a positive electrode material layer attached to one side of the current collector, and a conductive polymer film is attached to the outer side of the positive electrode material layer on the positive electrode plate.

[0073] The preparation method of the positive pole piece of the present embodiment comprises the following steps:

[0074] a) Preparation of positive plate: S / C composite positive electrode material is used as positive electrode active material, polytetrafluoroethylene is used as water-based binder, superconducting carbon black is used as conductive agent, according to the mass ratio of positive electrode active material, binder and conductive agent Mix evenly at a ratio of 7:3:1, add an appropriate amount of NMP as a solvent to make a slurry, apply the slurry evenly on an aluminum foil, and dry it in vacuum at 60°C for 12 hours. A positive...

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Abstract

The invention discloses a conducting polymer film and a positive pole piece modified by the same. The conducting polymer film is prepared by a method comprising the following steps: (1) coating a film-forming base with an initiator and putting the film-forming base coated with the initiator into a closed container containing a conductive polymer monomer; and (2) controlling vacuum conditions of the closed container, evaporating the conductive polymer monomer, carrying out in-situ polymerization on the film-forming base coated with the initiator to form the film and then drying. The conducting polymer film disclosed by the invention is prepared by a vacuum evaporation coating process, so that the conducting polymer film with a uniform thickness can be formed without complicated and harsh condition control in the polymerization process; the obtained conducting polymer film is uniform in thickness and can be arranged between a positive electrode and a membrane; the side reaction between an electrode material and an electrolyte is inhibited; and the structure stability and the heat stability of the positive electrode material in battery charging and discharging processes are improved, thereby improving the electrochemical properties of the material.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a conductive polymer film, and also relates to a positive pole piece modified by the conductive polymer film. Background technique [0002] Lithium-ion batteries have become ideal power sources for portable electronic devices such as mobile phones and notebook computers due to their outstanding advantages such as high specific energy, large capacity, high voltage, small self-discharge, good cycle performance, light weight, small size, and long service life. In recent years, in order to protect the environment and achieve sustainable development, countries around the world are competing to develop the electric vehicle industry, with a view to eventually completely replacing traditional fuel vehicles. The key to restricting the development of the electric vehicle industry is to develop power batteries with excellent performance. To meet the requirements o...

Claims

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Application Information

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IPC IPC(8): H01M4/137H01M4/60H01M4/66H01M10/0525C08J5/18
CPCC08J5/18H01M4/137H01M4/602H01M4/667H01M10/0525Y02E60/10
Inventor 张会双田栓宝尹艳红岳红云董红玉杨书廷
Owner HENAN NORMAL UNIV
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