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A positive electrode sheet, an electrochemical energy storage device containing the positive electrode sheet, and a preparation method thereof

An electrochemical and positive electrode technology, which is applied in the field of preparation of electrochemical energy storage devices, can solve problems such as liquid swelling, unevenness of the battery, and affecting the appearance of the battery, and achieve the effects of shortening the transmission path, simple and feasible method, and improving rate performance

Active Publication Date: 2018-06-05
GUANGDONG ZHUGUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, as the compaction density of the electrode increases, the porosity in the electrode will gradually decrease, and the space for storing the electrolyte will become less, but in order to ensure the cycle performance of the battery, the liquid injection volume of the battery cell must remain unchanged, so There will be a problem of "fluid swelling", which will make the battery surface uneven, affecting the appearance of the battery until it becomes a defective product, which is especially obvious in the pouch battery

Method used

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  • A positive electrode sheet, an electrochemical energy storage device containing the positive electrode sheet, and a preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation of the initial positive electrode sheet: preparation of the positive electrode sheet in Comparative Example 1;

[0036] Slurry configuration: choose aluminum oxide hollow particles with a particle size of 1 μm, a pressure bearing capacity of 3 MPa, a hollow part accounting for 60% of the total volume, and a shell porosity of 50% as the filler, water as the solvent, and PVDF as the viscous Adhesive, and the solid content of the hollow aluminum oxide is 98%, mixed into slurry for later use;

[0037] Positive electrode sheet preparation: gravure printing the above slurry on both surfaces of the above initial positive electrode sheet, wherein the thickness of the single-sided gravure layer is 4 μm; after drying, remember to store the composite positive electrode sheet for use.

Embodiment 2

[0039] The difference from Example 1 is that the proportion of the volume of the hollow part of the hollow aluminum oxide particles selected in this example to the total volume of the particles is 1%;

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

Embodiment 3

[0042] The difference from Example 1 is that the proportion of the volume of the hollow part of the hollow aluminum oxide particles selected in this example to the total volume of the particles is 10%;

[0043] The rest are the same as in Embodiment 1 and will not be repeated here.

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Abstract

The present invention discloses a negative electrode sheet, which comprises a negative electrode current collector and a negative electrode active substance coating distributed on the negative electrode current collector, wherein a composite porous coating is distributed on the negative electrode active substance coating and contains a hollow particle filler, the volume of the hollow part of the hollow particle filler accounts for 1-95% of the total volume of the hollow particle filler, the shell part of the hollow particle filler has a porous structure, the porosity of the shell part of the hollow particle filler is 1-90%, and the hollow particle filler can bear pressure of more than or equal to 0.05 MPa. According to the present invention, the hollow structure of the hollow particles can store the electrolyte so as to alleviate / solve the liquid swelling problem of the battery; with the electrolyte stored in the hollow particles, the ion conduction property of the particles can be increased, such that the electric core can have the good rate performance; and the safety of the battery can be improved.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy storage devices, and in particular relates to a positive electrode sheet and a preparation method of an electrochemical energy storage device containing the positive electrode sheet. 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, with the improvement of people's consumption demand, the requirements for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/131H01M10/42H01M4/1391
CPCH01M4/131H01M4/1391H01M10/4235Y02E60/10
Inventor 杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH