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A method for preparing graphene composite ternary material by monoalcohol solvothermal method

A graphene composite, ternary material technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of low initial charge and discharge efficiency, inability to exert rate performance, poor structural stability, etc., and achieve electrochemical performance. Excellent, low toxicity, low cost effect

Active Publication Date: 2017-03-08
SHANDONG YUHUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still some problems, such as low initial charge and discharge efficiency, poor structural stability, poor conductivity, and the rate performance cannot be exerted under high pressure, etc.

Method used

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  • A method for preparing graphene composite ternary material by monoalcohol solvothermal method
  • A method for preparing graphene composite ternary material by monoalcohol solvothermal method
  • A method for preparing graphene composite ternary material by monoalcohol solvothermal method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Commodity ternary material LiNi 0.5 co 0.3 mn 0.2 o 2 (Type 523), pre-treatment of commodity graphene: LiNi 0.5 co 0.3 mn 0.2 o 2 , graphene was dried in an oven at 120 °C for 3 h, and after cooling, it was ground separately until no agglomeration occurred, and then put into a desiccator for use; 0.1000 g of the above graphene was accurately weighed with a balance, and dispersed in a container Put magnets into a reaction kettle with 50 ml of anhydrous isopropanol, and use ultrasonic waves to assist dispersion; use a balance to accurately weigh 10.0021 g of ternary materials, graphene and LiNi 0.5 co 0.3 mn 0.2 o 2 The mass percentage is 1:100, and it is added to the inner lining of the reaction kettle in 3 times, stirred for 30 min, the magnet is taken out, the reaction kettle is closed, and it is put into an oven at 180 °C. After reacting for 12 hours, it is naturally cooled, and then Take out the lining of the reaction kettle for suction filtration, wash wit...

Embodiment 2

[0036] Commodity ternary material LiNi 0.5 co 0.3 mn 0.2 o 2 (type 523), graphene is pre-treated: the LiNi 0.5 co 0.3 mn 0.2 o 2 1. Graphene was dried in an oven at 150 °C for 2 hours, and after cooling, it was ground separately until no agglomeration occurred, and then put into a desiccator for use; 0.1001 g of graphene was accurately weighed with a balance, and dispersed in a container containing 50 Put a magnet in the reaction kettle in ml of absolute ethanol, and disperse with the help of ultrasonic waves; use a balance to accurately weigh 10.0002 gLiNi 0.5 co 0.3 mn 0.2 o 2 , graphene and LiNi 0.5 co 0.3 mn 0.2 o 2 The mass percentage is 1:100, and it is added to the lining of the reactor in 4 times, stirred for 30 min, the magnet is taken out, the reactor is closed, and it is placed in an oven with a temperature of 180 °C. After 12 hours of reaction, it is cooled naturally. Take out the inner liner for suction filtration, wash with ethanol three times, and ...

Embodiment 3

[0039] Commodity ternary material LiNi 0.5 co 0.3 mn 0.2 o 2 (type 523), graphene is pre-treated: the LiNi 0.5 co 0.3 mn 0.2 o 2 1. Graphene was dried in an oven at 180°C for 2 hours, and after cooling, it was ground separately until no agglomeration occurred, and then put into a desiccator for subsequent use; 0.0999 g of graphene was accurately weighed with a balance, and dispersed in a container containing 50 ml of anhydrous isopropanol reaction kettle, put magnets, use ultrasonic wave to assist dispersion; use balance to accurately weigh 9.9992 gLiNi 0.5 co 0.3 mn 0.2 o 2 , graphene and LiNi 0.5 co 0.3 mn 0.2 o 2 The mass percentage is 1:100, and it is added to the lining of the reactor in 4 times, stirred for 30 min, the magnet is taken out, the reactor is closed, and it is placed in an oven with a temperature of 200 ° C. After 24 hours of reaction, it is cooled naturally. Take out the inner liner for suction filtration, wash three times with isopropanol, and...

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Abstract

The invention belongs to the field of positive electrode materials for lithium ion batteries, and particularly relates to a method for preparing a graphene composite ternary material by a monovalent alcohol solvothermal method. Method for preparing graphene composite ternary material by monovalent alcohol solvothermal method, the ternary material is LiNixCoyMnzO2, x+y+z=1, 0.2≤x≤0.6, 0.1≤y≤0.4, 0.2≤z≤0.5; graphite The general chemical formula of the ene composite ternary material is Graphene / LiNixCoyMnzO2. The advantages of the present invention are: 1) Since the ternary material LiNixCoyMnzO2 is sensitive to water, it is a good choice for a monohydric alcohol to replace water as a solvent, because the temperature is less than 220℃ , when the pressure is not more than 3 MPa, the monohydric alcohol is easy to form a subcritical state, which is non-flammable, cheap, and weak in toxicity; 2) The graphene composite ternary cathode material prepared by the present invention has excellent electrochemical performance, and its rate performance is better than traditional 3) The preparation process is relatively simple, the cost is low, and it is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium ion batteries, and in particular relates to a method for preparing graphene composite ternary materials by monoalcohol solvothermal method. Background technique [0002] Lithium-ion battery is a new type of secondary battery that can replace lead-acid batteries. It has the advantages of high energy density, many charge and discharge times, good safety performance, and environmental friendliness. Lithium-ion batteries are mainly composed of positive electrode materials, negative electrode materials, electrolytes and separators. The positive electrode materials largely restrict the further improvement of the overall performance of lithium-ion batteries. Therefore, more and more attention has been paid to the development and research of positive electrode materials. [0003] In recent years, layered lithium-ion battery cathode materials (lithium cobaltate LiCoO 2 , lithium man...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/583
CPCH01M4/362H01M4/505H01M4/525H01M4/625H01M10/0525Y02E60/10
Inventor 杨伟王胜伟王瑛王玉强赵成龙陈欣宋春华冯涛王新鹏
Owner SHANDONG YUHUANG NEW ENERGY TECH
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