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Electrode plate and electrochemical device and electronic equipment comprising same

An electrode pole piece and electrochemical technology, applied in the field of energy storage, can solve the problems of loss of protection effect, peeling off, loss of physical contact, etc., and achieve the effects of inhibiting the growth of lithium dendrites, reducing polarization, and improving structural strength

Pending Publication Date: 2022-04-19
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will cause the interface between the negative pole piece and the less flexible inorganic protective coating to peel off (that is, the good physical contact between the two will be lost), and the protective effect will be lost.

Method used

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  • Electrode plate and electrochemical device and electronic equipment comprising same
  • Electrode plate and electrochemical device and electronic equipment comprising same
  • Electrode plate and electrochemical device and electronic equipment comprising same

Examples

Experimental program
Comparison scheme
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preparation example Construction

[0107] Preparation of lithium secondary battery

[0108] For the convenience of preparation and testing, the Preparation of half cells , and perform performance tests on half-cells. It can be understood that, in a half-cell, the above-mentioned electrode pole piece can be used as a positive electrode, while in an actual full battery, the above-mentioned electrode pole piece can be used as a negative electrode.

[0109] (1) Preparation of the positive electrode (electrode pole piece): use carbon fiber (CF) with a suitable diameter as the conductive fiber, and form a conductive layer containing a conductive network structure on the surface of the current collector; use glass fiber (GF) as the insulating fiber, and An insulating layer containing an insulating network structure is formed on the surface of the conductive layer, a certain volume percentage of insulating particles is doped in the insulating network structure, and the positive electrode is obtained through cutting...

Embodiment 1

[0124] Example 1: Preparation of positive pole (electrode pole piece): carbon fiber (CF) is used as the conductive fiber, and a conductive layer comprising a conductive network structure is formed on the surface of the current collector. The thickness of the conductive layer is 30 μm, and the porosity is 82%. The diameter of the conductive fiber is 5 μm; glass fiber (GF) is used as the insulating fiber, and an insulating layer containing an insulating network structure is formed on the surface of the conductive layer, and the insulating network structure is doped with 10% insulating particles Al 2 o 3 Particles, the thickness of the insulating layer is 20 μm, the porosity is 82%, the diameter of the insulating fiber is 1000 nm, and the positive electrode is obtained through processes such as cutting into pieces. The obtained positive electrode had a diameter of 18 mm.

Embodiment 2

[0125] Embodiment 2: The difference from Embodiment 1 is that the thickness of the conductive layer is 35 μm, and the thickness of the insulating layer is 15 μm.

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Abstract

The invention relates to the technical field of energy storage, in particular to an electrode plate and an electrochemical device and electronic equipment comprising the same. The electrode plate comprises a current collector, a first electrode and a second electrode, the conductive layer comprises a conductive network structure formed by conductive fibers; the insulating layer comprises an insulating network structure formed by insulating fibers and insulating particles arranged in the insulating network structure; wherein the conductive layer is located between the current collector and the insulating layer; the diameter of the conductive fibers is larger than that of the insulating fibers. The problem of volume expansion of the electrode plate of the electrochemical device in the cycle process can be improved, the short circuit risk of the electrochemical device can be further reduced, and the cycle performance of the electrochemical device can also be improved.

Description

technical field [0001] The present application relates to the technical field of energy storage, in particular, to an electrode pole piece and an electrochemical device and electronic equipment including the same. Background technique [0002] Electrochemical devices (for example, lithium-ion batteries) have the advantages of large specific energy (>200Wh / kg), high operating voltage (>3.5V), low self-discharge rate, small size, and light weight, and have a wide range of applications in the field of consumer electronics. application. With the rapid development of mobile electronic devices and electric vehicles, people have higher and higher demands on the energy density, cycle performance and safety of batteries. Among them, volumetric energy density and mass energy density are an important parameter to measure battery performance. [0003] Lithium metal is the metal with the smallest relative atomic mass (about 6.94) and the lowest standard electrode potential (-3.04...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/62H01M4/38H01M10/0525
CPCH01M4/134H01M4/382H01M4/628H01M4/625H01M4/626H01M10/0525H01M2004/027Y02E60/10
Inventor 李大光陈茂华谢远森
Owner NINGDE AMPEREX TECH