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Graphene-doped nickel cobalt lithium manganate composite positive electrode material and preparation method thereof

A composite cathode material, nickel-cobalt-lithium manganese oxide technology, applied in the direction of battery electrodes, electrical components, circuits, etc., can solve the problem of not effectively reducing the side reactions of ternary materials and electrolytes, reducing the energy density and processing performance of materials, and lacking Ternary material protection and other issues to achieve good cycle performance, improve electrical conductivity, and good rate performance

Inactive Publication Date: 2020-05-08
TORAY ADVANCED MATERIALS RES LAB CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this technical solution, graphene is used to do the overall doping of nickel-cobalt-manganese ternary materials. The amount of graphene used is high, which increases the cost on the one hand, and on the other hand, the higher amount of graphene doping will lead to lithium-cobalt-manganese oxide. The true density of the ternary material decreases, and the secondary structure becomes loose, thereby reducing the energy density and processing performance of the material, and the lack of protection for the ternary material cannot effectively reduce the side reactions of the ternary material and the electrolyte.

Method used

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  • Graphene-doped nickel cobalt lithium manganate composite positive electrode material and preparation method thereof
  • Graphene-doped nickel cobalt lithium manganate composite positive electrode material and preparation method thereof
  • Graphene-doped nickel cobalt lithium manganate composite positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Prepare 1 mol / L mixed metal ion salt solution A of nickel sulfate, cobalt sulfate, and manganese sulfate according to the molar ratio of nickel, cobalt, and manganese elements of 5:2:3, 1 L. Configure 6mol / L precipitant sodium hydroxide solution B, 1L. Prepare 3mol / L complexing agent ammonia solution C, 1L. Prepare 0.2L of mixed solution D of 1mol / L sodium hydroxide and 1mol / L ammonia water.

[0050] Neutralize the 0.5wt% graphene oxide solution G1 with sodium hydroxide to a pH of 10-11, then add dopamine hydrochloride according to the ratio of graphene oxide:dopamine hydrochloride = 10:1, and stir for 30 minutes at 4000rpm to obtain solution E .

[0051] Add 0.2L of solution D to the co-precipitation tank at one time, and under the protection of nitrogen atmosphere, add solution A, solution B and solution C to the coprecipitation tank at the same time at a rate of 0.01 L / min. Adjust the stirring speed to 200 rpm and the reaction temperature to 55°C. After dropping ...

Embodiment 2-6、 comparative example 1-5

[0054] Appropriately replace the graphene oxide solution G2-G6, adjust the concentration and volume of the solutions A, B, C, D, E, the time of addition, the rate of addition, the stirring speed, the temperature of reaction, and carry out the operation similar to that of Example 1 to obtain The graphene-doped nickel-cobalt-lithium manganate composite positive electrode material of Examples 2-6 and Comparative Examples 1-5 shown in Table 2-3.

Embodiment 7-14

[0071] Appropriately change the type of graphene oxide solution, adjust the atomic ratio of nickel-cobalt-manganese, the concentration and volume of solutions A, B, C, D, E, the time of addition, the rate of addition, the stirring speed, the reaction temperature, and perform steps similar to those in Example 1 According to the operation, the graphene-doped nickel-cobalt-lithium-manganese-oxide composite cathode material of Examples 7-14 as shown in Table 4 was obtained.

[0072] Table 4

[0073]

[0074] As shown in the above Tables 2 and 4, according to Examples 1 and 7-10, it can be seen that by adjusting the content of graphene in the nickel-cobalt-lithium-manganese-oxide shell, nickel-cobalt-lithium-manganate composite cathode materials with different graphene coverages can be prepared. Although the prepared nickel-cobalt-lithium manganese oxide composite cathode materials have good rate and cycle performance, when the coverage of graphene on the shell is more than 20% ...

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Abstract

The invention provides a graphene-doped nickel cobalt lithium manganate composite positive electrode material and a preparation method thereof. Graphene doping is carried out on an effective electrochemical active surface of a nickel-cobalt-manganese ternary material, so that the conductivity of the ternary material is improved. And meanwhile, the ternary material is coated with doped graphene, sothat the side reaction of the ternary material and an electrolyte is reduced. The prepared graphene-doped nickel cobalt lithium manganate composite positive electrode material has good rate capability and cycle performance.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium ion batteries, and in particular relates to a graphene-doped nickel-cobalt lithium manganate composite positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high discharge voltage, high energy density, long cycle life, and low environmental pollution. They have been widely used in 3C digital power supplies and electric tool power supplies for a long time. With policy support, the demand for lithium-ion batteries in the new energy vehicle industry is growing rapidly. [0003] Among the current cathode materials for lithium-ion batteries, nickel-cobalt lithium manganate ternary materials can basically meet the requirements for volumetric energy density and cycle life of power batteries for electric vehicles, and are widely used in power batteries for electric vehicles. However, as the requireme...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/62
CPCH01M4/364H01M4/525H01M4/625Y02E60/10
Inventor 赵太志川崎学陈桥杜宁
Owner TORAY ADVANCED MATERIALS RES LAB CHINA
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