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Lithium supplement composite diaphragm, preparation method and application

A composite diaphragm, lithium replenishment technology, applied in the direction of separator/film/diaphragm/spacer element, electrical component, electrochemical generator, etc., can solve the problem of low lithium ion transmission rate, insufficient lithium ion supply, and deterioration of electrochemical performance. and other problems, to achieve the effect of increasing ion transmission rate, improving heat shrinkage and improving safety

Active Publication Date: 2016-09-07
LUOYANG LIRONG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the condition of high magnification, the lithium ion transmission rate of the above-mentioned ceramic separator is low, and some even have insufficient supply of lithium ions, which makes the voltage platform low and the resistance becomes large, resulting in serious deterioration of electrochemical performance.

Method used

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  • Lithium supplement composite diaphragm, preparation method and application
  • Lithium supplement composite diaphragm, preparation method and application
  • Lithium supplement composite diaphragm, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] like figure 1 , 2 As shown, the lithium-replenishing composite diaphragm 11 includes: a base film 1 (commercially available Celgard film, PP film, model 2400, thickness 21 μm), and a 3 μm thick ceramic layer 2 and a ceramic-lithium supplementing layer are respectively arranged on both sides of the base film The ceramic-replenishing lithium layer is composed of a 2 μm thick ceramic layer 3-1 and a 1 μm thick lithium supplementing layer 3-2, and the ceramic layer 3-1 and the lithium supplementing layer 3-2 are sequentially arranged outward along the surface of the base film 1 .

[0040] The ceramic layer is composed of the following components in mass percentage: 54.5% of aluminum oxide powder (particle size 5 μm), 18.2% of polymethyl methacrylate (molecular weight 20,000, purchased from Shanghai Lizhe Chemical Co., Ltd.), nitrile Rubber (45% acrylonitrile content) 27.3%; the lithium replenishing layer is composed of the following components in mass percentage: metal li...

Embodiment 2

[0049] Lithium-supplemented composite separator, including: base film (PP film, SD214, thickness 20μm, purchased from Shenzhen Xingyuan Material Technology Co., Ltd.), with a 4.5μm-thick ceramic layer and a ceramic-lithium-replenishing layer on both sides of the base film. ; The ceramic-lithium-supplementing layer is composed of a 3 μm-thick ceramic layer and a 1.5 μm-thick lithium-replenishing layer, and the ceramic layer and the lithium-replenishing layer are sequentially arranged outward along the surface of the base film; wherein the ceramic layer is composed of the following mass percentage components : Al2O3 powder (particle size 10μm) 30%, polymethyl methacrylate (molecular weight 20,000) 30%, nitrile rubber (acrylonitrile content 35%) 40%; Component composition: metal lithium powder (particle size 200 μm) 50%, nitrile rubber (acrylonitrile content 35%) 50%.

[0050] The preparation method of the lithium-supplemented composite diaphragm comprises the following steps:

...

Embodiment 3

[0058] Lithium-replenishing composite separator, including: base film (PE film, SW309, thickness 25μm, purchased from Shenzhen Xingyuan Material Technology Co., Ltd.), and 6μm-thick ceramic layers and ceramic-lithium-replenishing layers are respectively provided on both sides of the base film; The ceramic-lithium supplementation layer is composed of a 4 μm thick ceramic layer and a 2 μm thick lithium supplementary layer, and the ceramic layer and the lithium supplementary layer are sequentially arranged outward along the surface of the base film; wherein the ceramic layer is composed of the following components in mass percentage: three Alumina powder (particle size 50μm) 90%, poly(isobutyl methacrylate) (molecular weight 50,000, purchased from Shanghai Lizhe Chemical Co., Ltd.) 5%, nitrile rubber (acrylonitrile content 20%) 5% %; the lithium supplement layer is composed of the following components by mass percentage: 80% of metallic lithium powder (particle size of 200 μm), 20...

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Abstract

The invention discloses a lithium supplement composite diaphragm, a preparation method and application, and belongs to the technical field of a lithium secondary battery. According to the lithium supplement composite diaphragm, a ceramic layer and a ceramic-lithium supplement layer are arranged at two sides of a base diaphragm; on the one hand, the temperature resistance of the diaphragm is improved, the heat shrinkable property of the diaphragm is improved, and the occurrence of short circuit accidents is reduced; and on the other hand, the Lithium ions consumed in the charge / discharge process can be timely supplemented, the ion transport speed is improved, and the structure stability in the circulation process of the lithium battery is improved. According to the lithium supplement composite diaphragm, the preparation method and the application, the lithium supplement layer is arranged on the surface of the ceramic layer, potential safety hazards resulting from micropore blocking due to the fact that metal lithium powder directly contacts the base diaphragm can be avoided, moreover, the ceramic layer plays a role in buffering and heat dissipation, and the security of the lithium powder in the use process is improved. Netty current collectors are employed in the lithium battery, and the lithium ions can pass through an anode sheet and a cathode pole rapidly, and a high speed channel is provided to supplement the lithium ions timely.

Description

technical field [0001] The invention relates to a lithium-supplementing composite diaphragm, and also relates to a preparation method and application of the composite diaphragm, belonging to the technical field of lithium secondary batteries. Background technique [0002] Lithium-ion batteries are widely used in digital, energy storage, electric vehicles and other fields due to their high specific energy, high specific power, long cycle life and excellent high and low temperature characteristics. [0003] Generally, a lithium-ion battery is composed of a positive electrode, a negative electrode, a separator, an electrolyte, and a battery casing, and relies on the migration of lithium ions between the positive and negative electrodes to provide energy. During charging and discharging, lithium ions intercalate and deintercalate back and forth between the two electrodes. When charging, Li + It is deintercalated from the positive electrode, inserted into the negative electrode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/434H01M50/443H01M50/449H01M50/451H01M50/457
CPCH01M10/0525H01M50/40H01M50/409H01M50/449Y02E60/10
Inventor 李志王燕
Owner LUOYANG LIRONG NEW ENERGY TECH
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