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Graphene-doped lithium cobaltate positive electrode material and preparation method thereof

A positive electrode material, lithium cobalt oxide technology, applied in the field of graphene-doped lithium cobalt oxide positive electrode material and its preparation, can solve the problems of lithium cobalt oxide positive electrode material cycle performance, poor electrochemical stability, etc., to achieve good cycle stability , simple preparation method, good electrochemical performance

Inactive Publication Date: 2019-10-08
SHENZHEN EIGEN EQUATION GRAPHENE TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a graphene-doped lithium cobaltate positive electrode material and a preparation method thereof, aiming at solving the problems of cycle performance and electrochemical stability of existing lithium cobaltate positive electrode materials. bad question

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  • Graphene-doped lithium cobaltate positive electrode material and preparation method thereof
  • Graphene-doped lithium cobaltate positive electrode material and preparation method thereof
  • Graphene-doped lithium cobaltate positive electrode material and preparation method thereof

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preparation example Construction

[0027] see figure 1 , figure 1 It is a flowchart of a preferred embodiment of the preparation method of the graphene-doped lithium cobaltate positive electrode material of the present invention, as shown in the figure, which includes steps:

[0028] S10, adding lithium carbonate and cobalt tetroxide into deionized water according to the ratio of Li:Co molar ratio of 1-1.2:1, grinding evenly to obtain a mixed solution;

[0029] S20. Spray drying the positive electrode material slurry to obtain a positive electrode material precursor;

[0030] S30, pre-heating the positive electrode material precursor in an air atmosphere, and then performing a calcination treatment to obtain a lithium cobaltate positive electrode material;

[0031] S40, adding lithium cobaltate positive electrode material and liquid polyacrylonitrile oligomer into deionized water according to a certain proportion for stirring, and then performing spray drying treatment to obtain a graphene-doped lithium cobal...

Embodiment 1

[0042] A lithium cobaltate cathode material doped with graphene, prepared by the following method:

[0043] (1) Weigh the corresponding mass of Li according to the ratio of Li: Co molar ratio of 1-1.2:1 2 CO 3 (99.5%), Co 3 o4 (99.9%) two raw materials, with deionized water as the dispersion medium, in a sand mill for several hours of high-speed grinding.

[0044] (2) Spray the slurry prepared by grinding, adjust the inlet air temperature to 150° C., and set the feed rate to 25 r / min. Obtain the positive electrode material precursor powder.

[0045] (3) Put the cathode material precursor powder material prepared by spray thermochemical reaction into a muffle furnace, preheat at 300°C for 4h in an air atmosphere, then sinter at 800°C, keep it warm for 6h, and cool it down to room temperature naturally, to obtain Lithium cobalt oxide cathode material.

[0046] (4) Add lithium cobaltate positive electrode material and 15% LPAN of lithium cobaltate mass into deionized water a...

Embodiment 2

[0051] A lithium cobaltate cathode material doped with graphene, prepared by the following method:

[0052] (1) Weigh the corresponding mass of Li according to the ratio of Li: Co molar ratio of 1-1.2:1 2 CO 3 (99.5%), Co 3 o 4 (99.9%) two raw materials, with deionized water as the dispersion medium, in a sand mill for several hours of high-speed grinding.

[0053] (2) Spray the slurry prepared by grinding, adjust the inlet air temperature to 150° C., and set the feed rate to 25 r / min. Obtain the positive electrode material precursor powder.

[0054] (3) Put the positive electrode material precursor powder material prepared by spray thermochemical reaction into a muffle furnace, preheat at 350°C for 4h in an air atmosphere, then sinter at 750°C, keep it warm for 8h, and cool it down to room temperature naturally to obtain Lithium cobalt oxide cathode material.

[0055] (4) Add lithium cobaltate positive electrode material and 10% LPAN of lithium cobaltate mass into deion...

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Abstract

The invention relates to a graphene-doped lithium cobaltate positive electrode material and a preparation method thereof. According to the invention, lithium carbonate, cobaltosic oxide and a liquid polyacrylonitrile oligomer are used as raw materials, and the graphene-doped lithium cobaltate positive electrode material is prepared by grinding, spray drying, preheating, high-temperature calcination, stirring, spray drying, pre-oxidation and secondary high-temperature calcination. According to the graphene-doped lithium cobaltate positive electrode material prepared by the method of the invention, the doping of graphene effectively controls the growth of crystal grains, the crystal grains in the material are orderly arranged and densely stacked, and the structural stability of the electrodematerial is maintained. Meanwhile, the excellent conductivity of graphene accelerates the electron mobility of the composite material, and the conductivity of the electrode material is effectively improved. In addition, the liquid polyacrylonitrile oligomer can form a graphene structure in the sintering process, so that the structure of the lithium cobaltate positive electrode material in the charging and discharging process is stabilized, and the material is enabled to still have good cycling stability under the high-rate charging and discharging condition.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a graphene-doped lithium cobalt oxide cathode material and a preparation method thereof. Background technique [0002] With the improvement of people's specific capacity, specific power, miniaturization and light weight, and environmental protection requirements for secondary batteries, lithium-ion batteries, as a new type of green energy, are characterized by high energy density, long cycle life, no memory effect, and no pollution. , good safety performance and other unique advantages, it has been widely used as the power supply of mobile phones, portable computers, video cameras, cameras, etc., and gradually replaces traditional Battery. With rapid development in just over ten years, lithium-ion batteries have surpassed and partially replaced traditional lead-acid batteries, nickel-cadmium, and nickel-metal hydride batteries in the market share of small rechargeable batteries,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/62H01M10/0525
CPCH01M4/525H01M4/625H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 刘剑洪冯斌斌张小勇孔金丽李凯黄少銮熊威王祎张汉平杨明林文忠
Owner SHENZHEN EIGEN EQUATION GRAPHENE TECH CO LTD
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