Lithium ion battery and preparation method thereof

A lithium-ion battery and conductive agent technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of danger in the synthesis process, high production cost, toxic reducing agent, etc., and achieve short process, simple operation, and cycle performance and the effect of rate performance improvement

Active Publication Date: 2019-07-12
湖南豪曼新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a modification method is not only cumbersome, the reaction requires high temperature and an inert atmosphere to make the production cost higher, but also the reducing agent (hydrazine hydrate, etc.) used is toxic, and the synthesis process is dangerous.

Method used

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  • Lithium ion battery and preparation method thereof
  • Lithium ion battery and preparation method thereof
  • Lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A kind of preparation reduced graphene oxide modified ternary material positive electrode sheet of the present invention, its preparation method comprises the following steps:

[0035] (1) Weigh 0.2g LiNi 0.6 co 0.2 mn 0.2 o 2 , with PVDF and conductive carbon black in a mass ratio of 8:1:1, after being fully ground in a mortar, evenly coated on an aluminum foil, and then placed in a blast drying oven to dry to obtain a positive electrode sheet;

[0036] (2) Take 5 parts of graphene oxide and disperse in NMP solution, ultrasonically disperse for 1 hour, and prepare a concentration of 0 g·mL -1 , 0.001g·mL -1 , 0.002g·mL -1 , 0.01g·mL -1 and 0.02g·mL -1 graphene oxide dispersion. Graphene oxide dispersions with different concentrations are coated on the positive electrode sheet in step (1), and the thickness of the graphene oxide coating is controlled to be 100 μm by a coating machine. Dry in a blast drying oven to obtain the reduced graphene oxide-modified tern...

Embodiment 2

[0048] A kind of preparation reduced graphene oxide modified ternary material positive electrode sheet of the present invention, its preparation method comprises the following steps:

[0049] (1) Weigh 0.2gLiNi 0.6 co 0.2 mn 0.2 o 2 , with PVDF and conductive carbon black in a mass ratio of 8:1:1, after being fully ground in a mortar, evenly coated on an aluminum foil, and then placed in a blast drying oven to dry to obtain a positive electrode sheet;

[0050] (2) Disperse graphene oxide in NMP solution, ultrasonically disperse for 1h, and prepare a concentration of 0.01g mL -1 graphene oxide dispersion. The graphene oxide dispersion is coated on the positive electrode sheet prepared by step (1), and the thickness of the graphene oxide coating is controlled by a coating machine to be 0, 50, 100 and 200 μm respectively. Dry in a blast drying oven to obtain the reduced graphene oxide-modified ternary material positive electrode sheet, and calculate the mass percentage of th...

Embodiment 3

[0058] A kind of preparation reduced graphene oxide modified ternary material positive electrode sheet of the present invention, its preparation method comprises the following steps:

[0059] (1) Weigh 0.2g LiNi 0.6 co 0.2 mn 0.2 o 2 , with PVDF and conductive carbon black in a mass ratio of 8:1:1, after being fully ground in a mortar, evenly coated on an aluminum foil, and then placed in a blast drying oven to dry to obtain a positive electrode sheet;

[0060] (2) Disperse graphene oxide in NMP solution, ultrasonically disperse for 1h, and prepare a concentration of 0.01g mL -1 graphene oxide dispersion. The graphene oxide dispersion is coated on the positive electrode sheet made by step (1), and the thickness of the graphene oxide coating is controlled to be 100 μm by a coating machine. Dry in a blast drying oven to obtain the reduced graphene oxide-modified ternary material positive electrode sheet, and calculate the mass percentage of the coated graphene oxide in the ...

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Abstract

The invention provides a lithium ion battery and a preparation method thereof. The preparation method of the lithium ion battery comprises the following steps: a ternary material is mixed with a conductive agent and a polymer binder, a mixture is applied to aluminum foil and dried, and a positive plate is obtained; graphene oxide is dispersed in a dispersing agent, a graphene oxide dispersion is obtained and applied to the positive plate, a graphene oxide coating is formed, and a graphene oxide modified positive plate is obtained; a button cell is formed by assembling the graphene oxide modified positive plate, a separator, an electrolyte, a lithium plate and a nickel net in a glove box; the button cell is subjected to electrochemical reduction, and the lithium ion battery is obtained. The positive pole of the lithium ion battery is graphene oxide modified positive pole made of the ternary material, the electronic conductivity is high, and cycle performance and rate capability are improved substantially.

Description

technical field [0001] The present invention relates to the technical field of lithium-ion batteries, in particular to a lithium-ion battery and a preparation method thereof. Background technique [0002] With the development of lithium-ion battery technology and its good economic benefits, social benefits and strategic significance (including automobiles, aerospace, military and other fields), the application of lithium-ion batteries is becoming more and more extensive, especially in electric vehicles, hybrid vehicles, etc. New energy fields such as automobiles, uninterruptible power supplies and solar power generation systems. As an important part of lithium-ion batteries, cathode materials are of great significance to the performance of batteries. Nickel-cobalt-manganese ternary cathode materials have attracted more and more attention and research because of their low price, convenient synthesis method, high energy density and safety. However, the cycle stability of nic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M4/583H01M4/62H01M4/505H01M4/525H01M10/0525C01B32/182
CPCH01M4/505H01M4/525H01M4/583H01M4/625H01M4/667H01M10/0525Y02E60/10
Inventor 李新海梁宇皓王接喜王志兴郭华军彭文杰胡启阳
Owner 湖南豪曼新能源科技有限公司
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