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Electrode of electrochemical energy storage device and preparation method thereof

An electrochemical and electrode technology, applied in the field of electrochemical energy storage devices, to achieve the effect of increasing safety, improving safety performance and facilitating industrial production

Inactive Publication Date: 2015-09-16
GUANGDONG ZHUGUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of these schemes is designed to solve the safety problem of the cell by controlling both ionic conductance and electronic conductance.

Method used

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  • Electrode of electrochemical energy storage device and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Positive sheet preparation: same as comparative example;

[0032] Functional layer slurry configuration: select beeswax particles with a particle size of 2 μm and alumina particles with a particle size of 2 μm, then add CMC (the mass ratio of the above three components is 60:39:1), and use water as a solvent. Fully stir to obtain the slurry for use;

[0033] Preparation of functional positive electrode sheet: coating the above-mentioned functional layer slurry on the surface of the above-mentioned positive electrode sheet, and drying to obtain a functional positive electrode sheet with a functional coating layer thickness of 4 μm for use;

[0034] Negative electrode sheet preparation: the same as the comparative example.

[0035] Cell assembly: Assemble the functional positive electrode, negative electrode, and separator into a bare cell, and then prepare the finished cell.

Embodiment 2

[0037] The difference from Embodiment 1 is that this embodiment includes the following steps:

[0038] Functional layer slurry configuration: select polyvinyl alcohol particles with a particle size of 0.05 μm, calcium oxide particles with a particle size of 0.05 μm, and then add CMC (the mass ratio of the above three components is 90:5:5), and water As a solvent, fully stir to obtain a slurry for use;

[0039] Preparation of functional positive electrode sheet: coating the above-mentioned functional layer slurry on the surface of the above-mentioned positive electrode sheet, and drying to obtain a functional positive electrode sheet with a functional coating layer thickness of 0.5 μm for use;

[0040] The rest are the same as in Embodiment 1 and will not be repeated here.

Embodiment 3

[0042] The difference from Embodiment 1 is that this embodiment includes the following steps:

[0043] Functional layer slurry configuration: select polyvinyl alcohol particles with a particle size of 0.05 μm and calcium oxide particles with a particle size of 0.05 μm, then add CMC (the mass ratio of the above three components is 5:90:5), and mix with water As a solvent, fully stir to obtain a slurry for use;

[0044] Preparation of functional positive electrode sheet: coating the above-mentioned functional layer slurry on the surface of the above-mentioned positive electrode sheet, and drying to obtain a functional positive electrode sheet with a functional coating layer thickness of 1 μm for use;

[0045] The rest are the same as in Embodiment 1 and will not be repeated here.

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Abstract

The invention discloses an electrode of an electrochemical energy storage device. The electrode comprises a current collector and a coating layer, wherein a functional layer is arranged on the surface layer of the coating layer, and organic particles and inorganic particles are contained in the functional layer; the organic particles can stably exist in an electrolyte, and the melting temperature T is greater than or equal to 60 DEG C and smaller than or equal to 600 DEG C; and the thermal failure temperature T1 of the inorganic particles is greater than or equal to 200 DEG C. When the temperature of a cell is out of control (greater than or equal to 60 DEG C), the organic particles in the functional layer are melted, and an ion transmission passage between an anode and a cathode is blocked (by controlling ionic conductance), so that the discharge capacity of the cell is weakened or lost, the quantity of heat production is reduced, and the safety performance of the cell is improved; moreover, due to the existence of the inorganic particles with high heat stability, the functional layer still has a function of blocking direct contact between the anode and the cathode (by controlling electron conductance) even if the organic particles in the functional are dissolved, and thus the safety of the cell is improved.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage devices, in particular to an electrode of an electrochemical energy storage device and a preparation method thereof. Background technique [0002] In 1991, Sony Corporation of Japan creatively adopted carbon materials as the anode material of lithium-ion batteries, which brought revolutionary changes in the field of lithium-ion batteries; And a lot of use on other portable electrical appliances. Lithium-ion batteries have many advantages, such as high voltage, small size, light weight, high specific capacity, no memory effect, no pollution, small self-discharge, long cycle life, etc. It is an ideal power source for mobile appliances and electric vehicles in the 21st century. Power supply and electric storage for storage power station. However, the lithium batteries used in electric vehicles (EV) and energy storage power stations (ES) have higher capacity and larger volume. safety. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/14H01M4/20H01M4/21H01M4/24H01M4/26H01M4/13H01M4/139H01G11/24H01G11/86
CPCH01G11/24H01G11/86H01M4/13H01M4/139H01M4/14H01M4/20H01M4/21H01M4/24H01M4/26Y02E60/10
Inventor 杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH
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