Modified lithium nickel cobalt manganese oxide cathode material and preparation method thereof

A technology of nickel-cobalt lithium manganese oxide and positive electrode materials, which is applied in the direction of battery electrodes, electrical components, electrochemical generators, etc., can solve the problem of electrochemical properties such as cycle performance and stability, and limit the large-scale commercial application of materials. Reduced cycle life, etc.

Active Publication Date: 2016-05-04
四川浩普瑞新能源材料股份有限公司
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Problems solved by technology

[0004] However, nickel-cobalt lithium manganese oxide cathode materials, especially nickel-rich ternary cathode materials, that is, nickel-rich nickel-cobalt lithium manganese oxide cathode materials, also have defects. They are easily corroded during the cycle, which reduces the cycle life and affects the Electrochemical properties such as cycle performance and stability performance limit the large-scale commercial application of this type of material; and due to the high nickel content of nickel-based materials, when the material is exposed to the ai

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  • Modified lithium nickel cobalt manganese oxide cathode material and preparation method thereof
  • Modified lithium nickel cobalt manganese oxide cathode material and preparation method thereof
  • Modified lithium nickel cobalt manganese oxide cathode material and preparation method thereof

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[0054] The invention provides a method for preparing a modified nickel-cobalt lithium manganese oxide positive electrode material, which is characterized in that it comprises the following steps:

[0055] 1) reacting nickel cobalt lithium manganate material, manganese nitrate and phosphoric acid in an organic solvent to obtain a composite material in which the surface of the nickel cobalt lithium manganate material is compounded with manganese phosphate;

[0056] The chemical formula of described nickel cobalt lithium manganate material is as shown in formula (I),

[0057] LiNi 1-x-y co x mn y o 2 (1); Wherein, x>0, y>0, 1>1-x-y>0;

[0058] 2) Mix the composite material, lithium source and graphene obtained in the above steps in a solvent, and then calcinate to obtain a modified nickel-cobalt-lithium-manganese-oxide positive electrode material.

[0059] In the present invention, the selection and ratio of the raw materials and other optimization principles are the same as...

Embodiment 1

[0081] Commercialized LiNi 0.6 co 0.2 mn 0.2 o 2 Materials The positive electrode material is added to absolute ethanol. The mass ratio of the positive electrode material to absolute ethanol is 1:3. After stirring and dispersing at a high speed, manganese nitrate and phosphoric acid are added in sequence, and the addition amount is according to LiMnPO 4 with LiNi 1-x-y co x mn y o 2 The mass ratio of 0.01:1 is calculated separately, the reaction temperature of the control system is 60°C, and the stirring speed is 400r / min. After the reaction is completed, it is filtered and dried to obtain MnPO 4 ·H 2 O uniformly coated nickel-cobalt lithium manganate cathode material;

[0082] The nickel-cobalt lithium manganese oxide positive electrode material obtained above is fully mixed with lithium source and graphene in deionized water medium, and the addition amount of its graphene is the same as that of LiNi 1-x-y co x mn y o 2 The mass ratio is 0.005:1, placed in a nitro...

Embodiment 2

[0090] Commercialized LiNi 0.5 co 0.2 mn 0.3 o 2 The positive electrode material is added to absolute ethanol, and the mass ratio of positive electrode material to absolute ethanol is 1:4. After stirring and dispersing at high speed, manganese nitrate and phosphoric acid are added in sequence, and the addition amount is according to LiMnPO 4 with LiNi 1-x-y co x mn y o 2The mass ratio of 0.02:1 is calculated separately, the reaction temperature of the control system is 70°C, the stirring speed is 500r / min, after the reaction is completed, it is filtered and dried to obtain MnPO 4 ·H 2 O uniformly coated nickel-cobalt lithium manganate cathode material;

[0091] The nickel-cobalt lithium manganese oxide positive electrode material obtained above is fully mixed with lithium source and graphene in anhydrous ethanol medium, and the addition amount of its graphene is the same as that of LiNi 1-x-y co x mn y o 2 The mass ratio is 0.01:1, placed in an argon atmosphere, an...

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Abstract

The invention provides a modified lithium nickel cobalt manganese oxide cathode material which comprises a lithium nickel cobalt manganese oxide material, LiMnPO4 combined on the surface of the lithium nickel cobalt manganese oxide material, and graphene combined on the surface of LiMnPO4. According to the invention, the lithium nickel cobalt manganese oxide material is modified through double combination, wherein a layer of LiMnPO4 coating the surfaces of particles can improve the interface stability of the material under a high cut-off voltage, and graphene coating at the outer layer can improve the electronic conductivity of the material and weak the polarization effect.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery electrode materials, in particular to a modified nickel-cobalt lithium manganese oxide positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high specific energy, long cycle life, light weight, less white discharge, no memory effect and high cost performance, and have become rechargeable batteries in high-power electric vehicles, artificial satellites, aerospace and other fields. The main selection object of the power supply. Therefore, lithium-ion batteries and related materials have become a research hotspot for researchers. Cathode material is one of the key materials of lithium-ion batteries, which determines the performance of lithium-ion batteries. At present, the biggest bottleneck that limits the energy density, power density, cycle life and safety of lithium-ion power bat...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/58H01M4/583H01M4/139H01M10/0525
CPCH01M4/139H01M4/366H01M4/505H01M4/525H01M4/5825H01M4/583H01M10/0525Y02E60/10
Inventor 贺天江石迪辉王飞唐世国周少江周宏祥
Owner 四川浩普瑞新能源材料股份有限公司
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