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Preparation method of graphene compounded Ni-Co lithium manganate material

A composite technology of nickel-cobalt lithium manganese oxide and graphene, which is applied in the fields of final product manufacturing, sustainable manufacturing/processing, and electrolyte storage battery manufacturing, can solve problems affecting the development of lithium-ion batteries and potential safety hazards, and achieve improved safety performance and Longevity, heat reduction, and temperature rise effects

Inactive Publication Date: 2018-06-29
江苏超电新能源科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in the lithium-ion battery market, due to the generally large internal resistance of the battery (10~30mΩ) and the use temperature range of the electrolyte, the lithium-ion battery can be charged even at a low charge-discharge rate (generally 0.2C~1C) ), the temperature rise during work will exceed 15°C, and in some specific environments, the operating temperature of the battery will exceed 55°C, which exceeds the normal operating temperature range of the electrolyte (-20~55°C), and there will be serious safety hazards Hidden dangers, so the larger battery internal resistance affects the development of lithium-ion batteries

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: the preparation method of the graphene composite nickel cobalt lithium manganese oxide material provided by the invention comprises the following steps:

[0017] (1) Preparation of graphene material: using graphite as raw material and deionized water as solvent, graphene was obtained by ultrasonic mechanical exfoliation, and the reaction time was 5 hours;

[0018] (2) Preparation of graphene-composite nickel-cobalt-lithium manganese oxide material: mix the graphene material into deionized water, then put a certain amount of nickel-cobalt lithium manganate into it, and add glucose with the same quality as graphite, at room temperature After 5 hours of ultrasonic mixing, further filtration and drying, a graphene composite nickel cobalt lithium manganese oxide material was obtained, wherein graphene accounted for 2% of the total mass of the composite material.

Embodiment 2

[0019] Embodiment 2: the preparation method of the graphene composite nickel cobalt lithium manganese oxide material provided by the invention comprises the following steps:

[0020] (1) Preparation of graphene material: using graphite as raw material and deionized water as solvent, graphene was obtained by ultrasonic mechanical exfoliation, and the reaction time was 6 hours;

[0021] (2) Preparation of graphene-composite nickel-cobalt-lithium manganese oxide material: mix the graphene material into deionized water, then put a certain amount of nickel-cobalt lithium manganate into it, and add glucose 1.5 times the mass of graphite. At room temperature, after 6 hours of ultrasonic mixing, further filtration, and drying, a graphene composite nickel-cobalt-lithium manganese oxide material was obtained, in which graphene accounted for 3% of the total mass of the composite material.

Embodiment 3

[0022] Embodiment 3: the preparation method of the graphene composite nickel cobalt lithium manganese oxide material provided by the invention comprises the following steps:

[0023] (1) Preparation of graphene material: using graphite as raw material and deionized water as solvent, graphene was obtained by ultrasonic mechanical exfoliation, and the reaction time was 7 hours;

[0024] (2) Preparation of graphene-composite nickel-cobalt-lithium manganese oxide material: mix the graphene material into water, put a certain amount of nickel-cobalt lithium manganate into it, and add glucose twice the mass of graphite. , after 8 hours of ultrasonic mixing, further filtration, and drying, a graphene composite nickel cobalt lithium manganate material was obtained, wherein graphene accounted for 5% of the total mass of the composite material.

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Abstract

The invention discloses a preparation method of a graphene compounded Ni-Co lithium manganate material. The preparation method comprises the following steps: taking graphite as raw material to obtainthe graphene by using an ultrasonic mechanical exfoliation method; mixing the graphene with Ni-Co lithium manganate in deionized water, adding glucose, thereby obtaining the graphene compounded Ni-Colithium manganate material through ultrasonic mixing, filtering and drying, wherein the ratio of the adding amount of the glucose to the mass of the raw material graphite is (1 to 1) to (1 to 3), themass percent of the graphene to the graphene compounded Ni-Co lithium manganate material is 2% to 5%. The anode material Ni-Co lithium manganate is modified by using the graphene, so that the internalresistance of the manufactured battery is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery preparation, in particular to a method for preparing a graphene composite nickel-cobalt lithium manganese oxide material. Background technique [0002] Due to its unique structure, excellent electrical conductivity, high specific surface area and reliable chemical stability, especially its outstanding thermal conductivity, graphene has received extensive attention in the field of lithium-ion battery research. [0003] At present, in the lithium-ion battery market, due to the generally large internal resistance of the battery (10~30mΩ) and the use temperature range of the electrolyte, the lithium-ion battery can be charged even at a low charge-discharge rate (generally 0.2C~1C) ), the temperature rise during work will exceed 15°C, and in some specific environments, the operating temperature of the battery will exceed 55°C, which exceeds the normal operating temperature range of the elec...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525H01M10/058
CPCH01M4/362H01M4/505H01M4/525H01M4/625H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 孙璀光王云峰姚晓青徐勇高洁
Owner 江苏超电新能源科技发展有限公司