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Coated electrode and lithium ion battery comprising the coated electrode

An electrode and coating technology, which is applied to battery electrodes, secondary batteries, battery pack components, etc., can solve problems such as combustion or explosion, rapid heating, etc., and achieve the effect of not being easy to explode, improving thermal stability and safety

Active Publication Date: 2018-10-12
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of these methods can fundamentally solve the problem of rapid heating after an internal short circuit between the positive and negative electrodes caused by external or internal impacts. Even if the diaphragm does not shrink under high temperature conditions, it may occur at any time. Hazardous accidents such as burning or explosion under a single impact

Method used

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  • Coated electrode and lithium ion battery comprising the coated electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～7

[0033] Preparation of Examples 1-7 Lithium-ion Batteries (referred to as batteries) 1-7

[0034] 1. The positive electrode sheet, negative electrode sheet and electrolyte in batteries 1 to 7 are prepared according to the following method:

[0035] (1) Preparation of positive electrode sheet

[0036] The positive electrode active material lithium cobalt oxide LiCoO 2 , conductive agent conductive carbon black Super-P, binder polyvinylidene fluoride (PVDF) is LiCoO by weight 2 :Super-P:PVDF=96:2:2 for mixing, then add the mixed material to N-methylpyrrolidone (NMP) and mix evenly to obtain positive electrode slurry; apply the positive electrode slurry on the aluminum foil of the positive electrode current collector , after drying at 85°C, cold pressing; then edge trimming, cutting, and stripping, and then drying at 85°C for 4 hours under vacuum conditions, and welding the tabs to obtain the positive electrode sheet.

[0037] (2) Preparation of negative electrode sheet

[003...

Embodiment 1

[0041] Preparation of Example 1 Battery 1

[0042] (1) the first inorganic particles Al(OH) 3 , the first binder polymethyl methacrylate, thickener sodium carboxymethyl cellulose (CMC) is Al(OH) by weight 3 : the first binder: CMC=98:1:1 mixed, then the mixed material is added to deionized water, mixed evenly, to obtain the first material layer slurry, the obtained first material layer slurry is coated on After the surface of the negative electrode sheet prepared above was dried to form a first material layer, the thickness of the first material layer was detected to be 3 μm;

[0043] (2) Mix the second binder polyvinylidene fluoride and polyacrylonitrile in a weight ratio of polyvinylidene fluoride:polyacrylonitrile 90:10, add the mixed material to deionized water, mix evenly, and obtain the first Two-substance layer slurry, after coating the obtained second substance layer slurry on the surface of polyethylene isolation film, drying to form a second substance layer, the th...

Embodiment 2

[0045] Example 2 Preparation of Battery 2

[0046] Repeat the preparation of battery 1 in Example 1, wherein the first inorganic particles Al(OH) 3 Boehmite (γ-AlOOH) was replaced, and the rest of the conditions remained unchanged, and a battery 2 with a thickness of 4.2 mm, a width of 34 mm, and a length of 82 mm was obtained.

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Abstract

The present application relates to a coated electrode and a lithium ion battery comprising the coated electrode, wherein the coated electrode includes a first material layer close to the electrode, and a layer close to the first material layer and far away from the electrode. The second material layer on the side, the first material layer includes first inorganic particles and a first binder, the second material layer includes a second binder, wherein the first inorganic particles are selected from metal At least one of hydroxides and boron-containing compounds. The electrode with coating provided by the present application includes the first material layer and the second material layer, and under the synergistic effect of the first material layer and the second material layer, the thermal stability and safety of the battery can be improved, such as the interior of the battery When both the battery and the outside are at a higher temperature, the battery is not easy to burn or explode.

Description

technical field [0001] The present application relates to the field of lithium ion batteries, in particular, to an electrode with coating and a lithium ion battery including the electrode with coating. Background technique [0002] At present, due to the increasing demand for mobile phones, video cameras, notebook computers, personal computers, and electric vehicles, electrochemical devices have received high attention, especially the development of rechargeable secondary batteries has become the focus of attention, Among them, the evaluation and guarantee of battery safety are very important issues that need to be considered. In particular, injury to the user due to battery failure should be avoided. Therefore, the safety of batteries is strictly limited by safety standards in terms of fire and combustion. In the prior art, many approaches have been carried out to solve the problems related to battery safety. [0003] For example, flame retardant materials have been appl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M10/0525H01M10/42H01M50/417H01M50/451
CPCH01M4/13H01M10/0525H01M10/4235H01M50/451H01M50/417H01M4/133H01M4/62H01M4/623H01M2300/0037H01M4/131H01M4/366H01M4/622Y02E60/10H01M50/46H01M4/136H01M4/364H01M4/483H01M4/58
Inventor 艾邓均闫传苗钟开富
Owner CONTEMPORARY AMPEREX TECH CO