Lithium battery diaphragm material as well as preparation method and application thereof

A lithium battery separator and raw material technology, applied in the field of electrochemistry, can solve problems such as thin thickness, and achieve the effects of simple process, small discharge capacity attenuation, and small particle size

Inactive Publication Date: 2020-08-28
犀望新能源科技(昆山)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this traditional polyolefin microporous separator has good chemical stability, thin thickness and high mechanical properties, in order to improve the high-rate charge-discharge performance and safety performance of power lithium batteries, it is urgent to develop new high-performance lithium batteries. diaphragm

Method used

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  • Lithium battery diaphragm material as well as preparation method and application thereof
  • Lithium battery diaphragm material as well as preparation method and application thereof
  • Lithium battery diaphragm material as well as preparation method and application thereof

Examples

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preparation example Construction

[0024] The preparation method of graphene oxide is as follows:

[0025] Step 1. Weigh 10g of natural graphite powder (G), 4g of potassium persulfate, and 10g of phosphorus pentoxide, and add them into a three-necked flask containing 24mL of sulfuric acid while stirring, and react in a constant temperature water bath at 60°C for 3h. Then move the three-neck flask to a constant temperature water bath at 25°C to react for 5 hours, filter it with suction, wash it with ionized water to neutrality, and dry it in air to obtain pre-oxidized graphite (P-G);

[0026] Step 2, take by weighing 1 g of pre-oxidized graphite, add in the there-necked flask that 25mL sulfuric acid is housed under the situation of stirring, put in the ice-water bath, after pre-oxidized graphite is all dissolved, add the potassium permanganate of 3g, react 2h, then move the three-neck flask to a constant temperature water bath at 35°C for 40min, then add deionized water, continue to react at 35°C for 1h, and fin...

Embodiment 1

[0032] Composition of raw materials (parts by weight): 5 parts of graphene oxide, 10 parts of ultra-high molecular weight polyethylene, 1 part of silver nitrate, 2 parts of tetraethyl titanate, 0.5 parts of citric acid, and 10 parts of o-dichlorobenzene.

[0033]The preparation method of lithium battery separator material, comprises the following steps:

[0034] S1. Weigh tetraethyl titanate, silver nitrate, and citric acid and dissolve them in deionized water, stir until dissolved, slowly add 15wt% ammonia water dropwise to adjust the pH value to 9, and stir the reaction at 70°C to make the solution become a hydrogel , transferred to an oven, heated and evaporated to dryness to obtain xerogel, which was transferred to a muffle furnace and heated to 450°C for roasting, and ground into a fine powder after cooling;

[0035] S2. UHMWPE is put into o-dichlorobenzene solution, heated to 120° C. in an oil bath, and after heating for 10 min, add the o-dichlorobenzene solution of grap...

Embodiment 2

[0037] Composition of raw materials (parts by weight): 10 parts of graphene oxide, 30 parts of ultra-high molecular weight polyethylene, 3 parts of silver nitrate, 5 parts of tetraethyl titanate, 3 parts of citric acid, and 20 parts of o-dichlorobenzene.

[0038] The preparation method of lithium battery separator material, comprises the following steps:

[0039] S1. Weigh tetraethyl titanate, silver nitrate, and citric acid and dissolve them in deionized water, stir until dissolved, slowly add 30wt% ammonia water dropwise to adjust the pH value to 10, and stir the reaction at 80°C to make the solution into a hydrogel , transferred to an oven, heated and evaporated to dryness to obtain xerogel, which was transferred to a muffle furnace and heated to 550°C for roasting, and ground into a fine powder after cooling;

[0040] S2. UHMWPE is put into o-dichlorobenzene solution, heated to 140° C. in an oil bath, and after heating for 30 min, add the o-dichlorobenzene solution of grap...

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Abstract

The invention provides a lithium battery diaphragm material. The lithium battery diaphragm material is prepared from the following raw materials: graphene oxide, ultrahigh molecular weight polyethylene, silver nitrate, tetraethyl titanate, citric acid and o-dichlorobenzene. Compared with a conventional diaphragm, the obtained diaphragm material has excellent wettability, high porosity and good airpermeability, and the electrochemical performance of a battery can be remarkably improved. Meanwhile, the diaphragm material is simple and convenient in process, high in yield, and easy to perform commercial production; and polysulfide can be prevented from passing through, so that the polysulfide is prevented from penetrating through the diaphragm under the condition of ensuring the conductivityof lithium ions, and a shuttle effect is retarded. The invention provides a diaphragm with ion selectivity, the electrochemical performance of a lithium-sulfur battery is remarkably improved, the attenuation of the discharge capacity in the cycle process is very small, the cycle stability is remarkably improved, and the diaphragm can be applied to a quick-charge lithium battery diaphragm material.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a lithium battery diaphragm material and a preparation method and application thereof. Background technique [0002] Lithium electrochemical cells, more commonly known as batteries (packs), are used in a wide variety of military and civilian products. Many of these products use high-energy and high-power batteries. Due in part to the miniaturization of portable electronic devices, it is desirable to develop smaller lithium batteries with increased power capacity and service life. Lithium-ion batteries are mainly composed of four major materials: positive electrode material, negative electrode material, electrolyte, and separator. The separator is a microporous film placed between the positive and negative electrodes of the battery, which allows lithium ions to pass through freely, while blocking the direct contact of the positive and negative electrodes to prevent shor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052H01M50/40H01M50/403H01M50/411H01M50/417
CPCH01M10/052H01M50/40H01M50/431H01M50/411Y02E60/10
Inventor 袁峰
Owner 犀望新能源科技(昆山)有限公司
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