Electrode plate for improving wettability of lithium battery electrolyte and preparation method of electrode plate

A technology for electrode pole pieces and lithium batteries, which is applied in battery electrodes, non-aqueous electrolyte storage battery electrodes, and electrode manufacturing. The effect of specific surface area

Pending Publication Date: 2022-03-18
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrode pole piece structure is expected to solve the problem that the ultra-thick electrode electrolyte is difficult to infiltrate while greatly improving the energy density, rate performance and service life of the battery.

Method used

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  • Electrode plate for improving wettability of lithium battery electrolyte and preparation method of electrode plate
  • Electrode plate for improving wettability of lithium battery electrolyte and preparation method of electrode plate
  • Electrode plate for improving wettability of lithium battery electrolyte and preparation method of electrode plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A groove structure lithium iron phosphate (LFP) positive pole piece is prepared by the following method:

[0037] (1) While moving the electrode pole piece horizontally, engrave a groove on the surface of the first surface of the electrode pole piece in a plastic state through a horizontal needle head and a corrugated needle head, and the horizontal needle head is fixedly carved to obtain a straight line stripe groove, so The corrugated needle scans and engraves back and forth to obtain the corrugated stripe groove, and then heats and dries at 100°C, and solidifies and forms to obtain the first electrode sheet with groove structure;

[0038] Among them, the shape of the horizontal needle and the corrugated needle is cylindrical, the diameter of the needle is 20 μm, the number of the horizontal needle is 1, the number of the corrugated needle is 1, and the scanning period of the corrugated needle is 0.08 milliseconds.

[0039] (2) While moving the electrode pole piece ob...

Embodiment 2

[0043] The main difference between this embodiment and embodiment 1 is that the number of horizontal needles is 2, the number of corrugated needles is 1, the diameter of the needles is 80 μm, the scanning period of the needles is 0.06 milliseconds, and the needles are heated and dried at 110° C.

[0044] In this embodiment, the groove structure electrode pole piece is as image 3 As shown, the front and back structures of the positive electrode sheet are composed of a corrugated groove and two linear grooves cross-linked with each other, wherein the straight stripes divide the corrugated stripes into three equal parts.

Embodiment 3

[0046]The main difference between this example and Example 1 is that the number of horizontal needles is 3, the number of corrugated needles is 1, the diameter of the needles is 140 μm, the scanning period of the needles is 0.04 milliseconds, and the needles are heated and dried at 120° C.

[0047] In this embodiment, the groove structure electrode pole piece is as image 3 As shown, the front and back structures of the positive pole piece are composed of one corrugated groove and three linear grooves interlinked with each other, wherein the straight stripes divide the corrugated stripes into four equal parts.

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PUM

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Abstract

The invention belongs to the field of lithium ion batteries, and particularly relates to an electrode plate for improving wettability of a lithium battery electrolyte and a preparation method of the electrode plate. The preparation method comprises the following steps that when the electrode plate is horizontally moved, a groove is carved in the surface of the first face of the electrode plate in a plastic state through a horizontal needle head and a corrugated needle head, the horizontal needle head is fixedly carved to obtain a linear stripe groove, and the corrugated needle head scans and carves back and forth to obtain a corrugated stripe groove; and heating, curing and forming to obtain the first surface groove structure electrode plate. And processing the second surface to obtain a second surface groove structure electrode pole piece, and rolling the electrode pole piece to obtain the groove structure electrode pole piece. The quasi-three-dimensional groove pattern is constructed, an electrolyte flowing channel is increased, the electrolyte transmission interface area is increased, meanwhile, the flowing distance of an electrolyte in the electrode plate is shortened, the interior of the electrode plate can be rapidly and completely infiltrated, and the electrode plate has very high application value.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to an electrode sheet for improving the wettability of electrolyte solution of lithium batteries and a preparation method thereof. Background technique [0002] In lithium-ion batteries, the electrolyte plays the role of conducting the ions between the positive and negative electrodes and acting as a charging and discharging medium. Therefore, the degree of infiltration of the electrolyte in the battery directly affects performance indicators such as the energy density and life of the battery. For the infiltration process of the electrolyte, it intersects the positive and negative pole pieces, and the diaphragm has a large porosity. It is generally believed that the electrolyte first penetrates the diaphragm, and then penetrates into the inside of the electrode pole piece. However, the thickness of the separator is thin and the actual porosity is limited, and the abi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/13H01M4/04H01M10/0525
CPCH01M4/139H01M4/13H01M4/043H01M10/0525Y02E60/10
Inventor 李真王华黄云辉
Owner HUAZHONG UNIV OF SCI & TECH
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