A graphene composite material for battery and preparation method thereof

Abstract

The present invention belongs to the field of battery technology, and more specifically relates to a graphene composite material for batteries and a preparation method thereof. A graphene composite material for batteries, the raw materials for preparing the graphene composite material, in parts by weight, include: 1-10 parts of polyethylene polymer material, 0.5-5 parts of molybdate, 0.5-5 parts of metal active material, and 0.1-3 parts of carbon material. The application of the graphene composite material prepared by this application in batteries not only improves the energy density of the battery, but also has a simple preparation process, no high requirements for the assembly environment, and extremely high safety. Even if severely damaged, it will not explode. On the other hand, the specific graphene quantum dots used in this application will increase the cycle life of the battery material to a higher level, which can lead the development of batteries.

Description

Technical Field

[0001] The present invention belongs to the technical field of batteries, and more specifically relates to a graphene composite material for batteries and a preparation method thereof. Background Art

[0002] With the advancement of technology and the enhancement of people's environmental awareness, batteries are being used more and more due to their high voltage and strong discharge current.

[0003] However, further modification of electrode materials to make them safer, heatable and coolable, with fast charging and discharging performance, easy to produce, fully chargeable and fully dischargeable, with long cycle life, non-toxic and harmless, and green and environmentally friendly is the direction that researchers are currently working towards.

[0004] In order to further enhance the use value of batteries, the production and preparation of a battery material with high energy density, high safety performance, and deep charge and discharge capabilities has become the key to determining the future development direction of batteries. Summary of the Invention

[0005] In order to solve the above technical problems, the first aspect of the present invention provides a graphene composite material for batteries. The raw materials for preparation include, by weight, 1-10 parts of polyethylene polymer material, 0.5-5 parts of molybdate, 0.5-5 parts of metal active material, and 0.1-3 parts of carbon material.

[0006] As a preferred technical solution, the polyethylene polymer material is selected from at least one of polyvinyl alcohol, polyethylene-propylene copolymer, polyethylene carbonyl polymer, and polyethylene-acrylate polymer.

[0007] As a preferred technical solution, the molybdate is selected from at least one of sodium molybdate, thallium molybdate and magnesium molybdate.

[0008] As a preferred technical solution, the metal active material is selected from at least one of zinc oxide, nickel oxide, nickel hydroxide, and lithium hydroxide.

[0009] As a preferred technical solution, the carbon material is selected from at least one of graphene, carbon fiber, carbon nanotubes, and graphene oxide.

[0010] As a preferred technical solution, the graphene is selected from graphene quantum dots.

[0011] As a preferred technical solution, the graphene quantum dots are selected from at least one of white light graphene quantum dots, red light graphene quantum dots, blue light graphene quantum dots, and green light graphene quantum dots.

[0012] As a preferred technical solution, the preparation raw materials also include 10-30 parts of deionized water.

[0013] A second aspect of the present invention provides a method for preparing a graphene composite material for a battery, comprising the following steps:

[0014] 1) adding polyethylene polymer material, molybdate, and metal active material to 2 / 3 of the total weight of deionized water, stirring to obtain a mixed solution;

[0015] 2) Take the remaining deionized water, dissolve the carbon material in it and disperse it;

[0016] 3) Pour the dispersion obtained in step 2) into the mixed solution obtained in step 1), sonicate, place in a reactor, react, wash, and dry to obtain the product.

[0017] As a preferred technical solution, the graphene composite material is used as a battery positive electrode material and / or a battery negative electrode material.

[0018] Beneficial effects:

[0019] The application of the graphene composite material prepared by this application in batteries not only improves the energy density of the battery, but also has a simple preparation process, no high requirements for the assembly environment, and extremely high safety. Even if severely damaged, it will not explode. On the other hand, the specific graphene quantum dots used in this application will increase the cycle life of the battery material to a higher level, which can lead the development of batteries. DETAILED DESCRIPTION

[0020] In order to solve the above technical problems, the first aspect of the present invention provides a graphene composite material for batteries. The raw materials for preparation include, by weight, 1-10 parts of polyethylene polymer material, 0.5-5 parts of molybdate, 0.5-5 parts of metal active material, and 0.1-3 parts of carbon material.

[0021] In some preferred embodiments, the polyethylene polymer material is selected from at least one of polyvinyl alcohol, polyethylene-propylene copolymer, polyethylene carbonyl polymer, and polyethylene-acrylate polymer.

[0022] In a preferred embodiment, the polyethylene polymer material is selected from polyethylene carbonyl polymer.

[0023] In a preferred embodiment, the molecular structure of the polyethylene carbonyl polymer is: n is a positive integer.

[0024] Polyvinyl carbonyl polymer The weight average molecular weight is 10000-58000 and was purchased from MacLean Reagent Network.

[0025] In some preferred embodiments, the molybdate is selected from at least one of sodium molybdate, thallium molybdate, and magnesium molybdate.

[0026] In some preferred embodiments, the metal active material is selected from at least one of zinc oxide, nickel oxide, nickel hydroxide, and lithium hydroxide.

[0027] In a preferred embodiment, the metal active material is selected from nickel hydroxide.

[0028] In some preferred embodiments, the carbon material is selected from at least one of graphene, carbon fiber, carbon nanotubes, and graphene oxide.

[0029] In a preferred embodiment, the graphene is selected from graphene quantum dots.

[0030] In a preferred embodiment, the weight of the graphene quantum dots is 1 to 10 wt% of the weight of the polyethylene polymer material.

[0031] In some preferred embodiments, the graphene quantum dots are selected from at least one of white light graphene quantum dots, red light graphene quantum dots, blue light graphene quantum dots, and green light graphene quantum dots.

[0032] In a preferred embodiment, the graphene quantum dots are selected from blue light graphene quantum dots.

[0033] Blue light graphene quantum dots, model XF042-1, were purchased from Jiangsu Xianfeng Nanomaterials Technology Co., Ltd.

[0034] In some preferred embodiments, the raw materials further include 10-30 parts of deionized water.

[0035] After extensive creative experimental research, the applicant has developed a graphene composite material for batteries. During the preparation process, the weight of the graphene quantum dots is guaranteed to be 1-10wt% of the weight of the polyethylene polymer material, ensuring that the graphene quantum dots are evenly dispersed in the polyethylene polymer material and the metal active material. This allows for better protection of the electrode material through hydrogen bonding, van der Waals forces, and other interactions between the materials, reducing the aggravation of dendrites and corrosion that may occur in the electrodes. Furthermore, the preparation process is simple, the assembly environment does not have high requirements, and the safety is extremely high. Even with severe damage, there will be no explosion. Furthermore, the specific graphene quantum dots used will increase the cycle life of the battery material to a higher level, which can lead the development of batteries.

[0036] A second aspect of the present invention provides a method for preparing a graphene composite material for a battery, comprising the following steps:

[0037] 1) adding polyethylene polymer material, molybdate, and metal active material to 2 / 3 of the total weight of deionized water, stirring to obtain a mixed solution;

[0038] 2) Take the remaining deionized water, dissolve the carbon material in it and disperse it;

[0039] 3) Pour the dispersion obtained in step 2) into the mixed solution obtained in step 1), sonicate, place in a reactor, react, wash, and dry to obtain the product.

[0040] In some preferred embodiments, the graphene composite material is used as a positive electrode material and / or a negative electrode material for a battery.

[0041] The present invention is described in detail below by way of examples. It is necessary to point out that the following examples are only used to further illustrate the present invention and are not to be construed as limiting the scope of protection of the present invention. Any non-essential improvements and adjustments made by professionals in this field based on the above-mentioned contents of the present invention still fall within the scope of protection of the present invention.

[0042] In addition, unless otherwise stated, all raw materials used were commercially available.

[0043] Example

[0044] Example 1

[0045] A graphene composite material for batteries, the raw materials for preparation are calculated by weight, including: polyethylene carbonyl polymer 2 parts, sodium molybdate 1.2 parts, nickel hydroxide 3 parts, blue light graphene quantum dots 0.2 parts, deionized water 15 parts.

[0046] Carbonyl polymers The average weight-average molecular weight is 24,000, product number P816207, purchased from Maclean Reagent Network.

[0047] Blue light graphene quantum dots, model XF042-1, were purchased from Jiangsu Xianfeng Nanomaterials Technology Co., Ltd.

[0048] A method for preparing a graphene composite material for a battery comprises the following steps:

[0049] 1) adding a polyethylene carbonyl polymer material, sodium molybdate, and nickel hydroxide to 2 / 3 of the total weight of deionized water, stirring to obtain a mixed solution;

[0050] 2) Take the remaining deionized water, dissolve the blue light graphene quantum dots in it, and disperse them;

[0051] 3) Pour the dispersion obtained in step 2) into the mixed solution obtained in step 1), sonicate, place in a reactor, react, wash, and dry to obtain the product.

[0052] Example 2

[0053] A graphene composite material for batteries, the raw materials for preparation are calculated by weight, including: polyethylene carbonyl polymer 10 parts, 1.2 parts of sodium molybdate, 3 parts of nickel hydroxide, 0.5 parts of blue light graphene quantum dots, and 30 parts of deionized water.

[0054] Carbonyl polymers The average weight-average molecular weight is 24,000, product number P816207, purchased from Maclean Reagent Network.

[0055] Blue light graphene quantum dots, model XF042-1, were purchased from Jiangsu Xianfeng Nanomaterials Technology Co., Ltd.

[0056] A method for preparing a graphene composite material for a battery is described in Example 1.

[0057] Example 3

[0058] A graphene composite material for batteries, the raw materials for preparation are calculated by weight, including: polyethylene carbonyl polymer 2 parts, sodium molybdate 1.2 parts, nickel hydroxide 3 parts, blue light graphene quantum dots 0.5 parts, deionized water 15 parts.

[0059] Carbonyl polymers The average weight-average molecular weight is 24,000, product number P816207, purchased from Maclean Reagent Network.

[0060] Blue light graphene quantum dots, model XF042-1, were purchased from Jiangsu Xianfeng Nanomaterials Technology Co., Ltd.

[0061] A method for preparing a graphene composite material for a battery is described in Example 1.

[0062] Example 4

[0063] A graphene composite material for batteries, the specific implementation of which is the same as that of Example 1, except that the polyethylene carbonyl polymer The average weight-average molecular weight of the reagent is 1000, product number P816209, purchased from Maclean Reagent Network.

[0064] Example 5

[0065] A graphene composite material for batteries, the specific implementation of which is the same as that of Example 1, except that the polyethylene carbonyl polymer The average weight-average molecular weight of the reagent is 1000, product number P816205, purchased from Maclean Reagent Network.

[0066] Example 6

[0067] A graphene composite material for a battery, the specific implementation of which is the same as that of Example 1, except that the graphene quantum dots are white light graphene quantum dots, model XF237, purchased from Jiangsu Xianfeng Nanomaterial Technology Co., Ltd.

[0068] Example 7

[0069] A graphene composite material for a battery, the specific implementation of which is the same as that of Example 1, except that the graphene quantum dots are red light graphene quantum dots, model XF215, purchased from Jiangsu Xianfeng Nanomaterial Technology Co., Ltd.

[0070] Example 8

[0071] A graphene composite material for a battery, the specific implementation of which is the same as that of Example 1, except that the graphene quantum dots are yellow light graphene quantum dots, model XF152, purchased from Jiangsu Xianfeng Nanomaterial Technology Co., Ltd.

[0072] Performance testing:

[0073] Description: During the test, polyethylene carbonyl polymer The negative electrode material of the battery is prepared by a formula of 2 parts of tantalum, 1.2 parts of sodium molybdate, 3 parts of zinc oxide, 0.2 parts of blue light graphene quantum dots, and 15 parts of deionized water. The preparation method refers to the preparation method of the graphene composite material in this application; the positive electrode material is the graphene composite material prepared in Example 1-8.

[0074] 1. The graphene composite materials prepared in Examples 1-8 were subjected to charge and discharge cycle tests. The test conditions were: a constant temperature of 25°C and a current density of 500 mA / g using a Land2001A battery test system. The experiment was stopped when the charge and discharge efficiency of the test battery reached 95%. The number of cycles was recorded, and the test results are statistically summarized in the table below.

[0075] 2. The energy density of the graphene composite materials prepared in Examples 1-8 was tested according to the test method in accordance with GB / T31467.3-2015, and the test results are summarized in the table below.

[0076] experiment Number of cycles / times Energy density (Wh / Kg) Example 1 2680 400 Example 2 2450 200 Example 3 1850 90 Example 4 1500 180 Example 5 860 150 Example 6 1960 360 Example 7 2100 240 Example 8 2240 320

[0077] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A graphene composite material for a battery, characterized in that: The raw materials for preparation include, by weight: 1-10 parts of polyethylene polymer material, 0.5-5 parts of molybdate, 0.5-5 parts of metal active material, and 0.1-3 parts of carbon material; The polyethylene-based polymer material is a polyethylene carbonyl polymer, and the molecular structure of the polyethylene carbonyl polymer is: , n is a positive integer; The carbon material is selected from graphene, the graphene is selected from graphene quantum dots, and the graphene quantum dots are selected from blue light graphene quantum dots; The weight of the graphene quantum dots is 1-10 wt% of the polyethylene polymer material; The preparation raw materials also include 10-30 parts of deionized water; The method for preparing the graphene composite material for batteries comprises the following steps: 1) Add polyethylene polymer material, molybdate, and metal active material to 2 / 3 of the total weight of deionized water, stir, and obtain a mixed solution; 2) Take the remaining deionized water, dissolve the carbon material in it and disperse it; 3) Pour the dispersion obtained in step 2) into the mixed solution obtained in step 1), perform ultrasonic treatment, place in a reaction vessel, react, wash, and dry to obtain the product.

2. The graphene composite material for batteries according to claim 1, wherein The molybdate is selected from at least one of sodium molybdate, thallium molybdate and magnesium molybdate.

3. The graphene composite material for batteries according to claim 1, wherein The metal active material is selected from at least one of zinc oxide, nickel oxide, nickel hydroxide and lithium hydroxide.

4. A method for preparing a graphene composite material for batteries according to any one of claims 1 to 3, characterized in that: The following steps are involved: 1) Add polyethylene polymer material, molybdate, and metal active material to 2 / 3 of the total weight of deionized water, stir, and obtain a mixed solution; 2) Take the remaining deionized water, dissolve the carbon material in it and disperse it; 3) Pour the dispersion obtained in step 2) into the mixed solution obtained in step 1), perform ultrasonic treatment, place in a reaction vessel, react, wash, and dry to obtain the product.

5. The method for preparing a graphene composite material for batteries according to claim 4, wherein: The graphene composite material is used as a positive electrode material and / or a negative electrode material for a battery.

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