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Electrode sheet and electrochemical device and electronic equipment comprising same

An electrochemical and pole piece technology, which is applied in the field of energy storage, can solve problems such as increased internal resistance, poor cycle performance, and pole piece stripping, and achieves the goals of improving adhesion, shape stability, and excellent rate performance Effect

Pending Publication Date: 2020-12-29
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the negative electrode active materials (such as graphite, silicon-based materials) have severe volume expansion and contraction. In the prior art, the part of the active material close to the surface of the negative electrode current collector has low cohesive force. With the expansion and contraction of the volume of the active material during the cycle , it is very easy to cause the separation of the negative electrode active material layer close to the surface of the current collector and the surface of the current collector, resulting in the stripping of the pole piece, which in turn leads to increased internal resistance and poor cycle performance

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0178] 1. Preparation of lithium ion battery

[0179] 1. Preparation of negative electrode

[0180] Mix the first conductive agent and the first binder with deionized water according to the mass ratio, and stir evenly to obtain the primer slurry. The primer slurry was coated on a 12 μm copper foil and baked at 50° C. for 5 minutes. The active material, the second binder and the second conductive agent are mixed with deionized water according to the mass ratio, and stirred evenly to obtain negative electrode active material slurry. The negative electrode active material slurry is coated on the undercoat layer. Drying, cold pressing, cutting into pieces and welding tabs to obtain the negative electrode. The negative electrode was set according to the conditions of the following examples and comparative examples, so that it had corresponding composition and parameters.

[0181] 2. Preparation of positive electrode

[0182] Mix the positive electrode material lithium cobaltat...

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Abstract

The invention relates to the technical field of energy storage, particularly to an electrode sheet, and an electrochemical device and electronic equipment comprising the same. The electrode sheet provided by the invention comprises a current collector and a diaphragm, wherein the diaphragm comprises a bottom coating arranged on the surface of the current collector and an active substance layer arranged on the surface of the bottom coating, the bottom coating comprises a first binder and a first conductive agent, and the binding power of the diaphragm and the current collector is greater than or equal to 20 N / m. According to the invention, the problem that in the prior art, due to the fact that the bonding force of the active material part close to the surface of the current collector is low, the electrode sheet is prone to stripping can be solved.

Description

technical field [0001] The present application relates to the technical field of energy storage, in particular to a pole piece and an electrochemical device and electronic equipment containing it, especially a lithium ion battery. Background technique [0002] As technology develops and the demand for mobile devices increases, the demand for electrochemical devices, such as lithium-ion batteries, has increased significantly. Lithium-ion batteries with high energy density and excellent life and cycle characteristics are one of the research directions. [0003] As the cycle progresses, the positive and negative electrodes of the lithium-ion battery repeatedly intercalate and extract lithium ions, and with the intercalation and extraction of lithium ions, the volume of the active material also expands and contracts accordingly. Among them, negative electrode active materials (such as graphite, silicon-based materials) have severe volume expansion and contraction. In the prior ...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139H01M4/62H01M10/0525H01M10/0567H01M10/42
CPCH01M4/13H01M4/139H01M10/0525H01M4/622H01M10/0567H01M10/4235H01M2004/027Y02E60/10H01M4/386H01M4/134H01M50/409H01M4/36H01M50/489H01M4/625H01M10/0569H01M4/133H01M10/0585H01M4/587H01G11/28H01G11/38H01G11/50H01G11/06H01M50/491H01M4/58H01M4/64
Inventor 江兵王可飞
Owner NINGDE AMPEREX TECH
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