Lithium ion battery adopting lithium-rich manganese-based material as positive electrode and preparation method of lithium ion battery

A lithium-ion battery, lithium-rich manganese-based technology, used in nanotechnology for materials and surface science, secondary batteries, battery electrodes, etc., can solve problems such as low energy density, achieve high energy density, and improve porosity. , the effect of enhancing the embedding ability

Inactive Publication Date: 2014-02-05
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of this, the purpose of the present invention is to overcome the shortcomings of low energy density of lithium-ion batteries in the prior art, to provide a lithium-ion battery with lithium-rich manganese-based materials as positive electrodes, and to improve the energy density of lithium-rich manganese-based lithium-ion batteries At the same time, improve the battery rate performance and cycle life

Method used

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  • Lithium ion battery adopting lithium-rich manganese-based material as positive electrode and preparation method of lithium ion battery
  • Lithium ion battery adopting lithium-rich manganese-based material as positive electrode and preparation method of lithium ion battery
  • Lithium ion battery adopting lithium-rich manganese-based material as positive electrode and preparation method of lithium ion battery

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preparation example Construction

[0049] The invention provides a method for preparing a lithium-ion battery using a lithium-rich manganese-based material as a positive electrode, comprising the following steps:

[0050] The preparation of positive electrode slurry and negative electrode slurry includes the following steps: adding 80-95% (weight ratio) of positive electrode active material, 3-18% (weight ratio) of conductive agent, and 2-17% (weight ratio) of binder In an organic solvent, after high-speed stirring, it is configured into a positive electrode slurry; 80-95% (weight ratio) of the negative electrode active material, 3-18% (weight ratio) of the conductive agent, and 2-17% (weight ratio) of the binder are respectively Add organic solvent or deionized water, after high-speed stirring, prepare negative electrode slurry;

[0051] The preparation of the positive electrode surface coating slurry includes the following steps: add 85-97% (weight ratio) of nanomaterials and 3-15% (weight ratio) of binders t...

Embodiment 1

[0058] (1) Preparation of positive and negative electrode slurries: 93% (weight ratio) of lithium-rich manganese-based materials, 4% (weight ratio) of conductive carbon black, and 3% (weight ratio) of PVDF were added to NMP, respectively. After high-speed stirring, uniformly mix into positive electrode slurry; 93% (weight ratio) of artificial graphite, 3% (weight ratio) of conductive carbon black, 1.5% (weight ratio) of CMC and 2.5% (weight ratio) of SBR are respectively Add it into deionized water, and mix it evenly to form negative electrode slurry after high-speed stirring.

[0059] (2) Preparation of positive pole piece and negative pole piece: refer to figure 1 , the prepared positive electrode slurry 2 and positive electrode slurry 4 were uniformly coated on both sides of the aluminum foil 3 by a coating machine, and the surface density of one side was 18.5 mg / cm 2, after drying and rolling, the positive electrode sheet is obtained. Surface coating slurry 1 and surface...

Embodiment 2

[0077] (1) Preparation of positive and negative electrode slurries: 95% (weight ratio) of lithium-rich manganese-based materials, 3% (weight ratio) of conductive carbon black, and 2% (weight ratio) of PVDF were added to NMP, and the After high-speed stirring, uniformly mix into positive electrode slurry; 95% (by weight) of artificial graphite, 3% (by weight) of conductive carbon black, 0.5% (by weight) of CMC and 1.5% (by weight) of SBR Add it into deionized water, and mix it evenly to form negative electrode slurry after high-speed stirring.

[0078] (2) Preparation of positive electrode sheet and negative electrode sheet: The prepared positive electrode slurry is evenly coated on both sides of the aluminum foil by a coating machine, and the density of one side is 18.5 mg / cm 2 , after drying and rolling, the positive electrode sheet is obtained. A slurry containing 97% (weight ratio) of nano-alumina and 3% (weight ratio) of a binder is evenly coated on the rolled positive el...

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Abstract

The invention discloses a lithium ion battery adopting a lithium-rich manganese-based material as a positive electrode and a preparation method of the lithium ion battery. The lithium ion battery adopting the lithium-rich manganese-based material as the positive electrode comprises a positive electrode, a positive electrode surface coating, a negative electrode, a diaphragm and electrolyte. The lithium ion battery adopting the lithium-rich manganese-based material as the positive electrode has the advantages of high energy density, good multiplying power property and long cycling service life.

Description

technical field [0001] The invention relates to a lithium-ion battery and a preparation method thereof, in particular to a lithium-ion battery with a lithium-rich manganese-based material as a positive electrode and a preparation method thereof. Background technique [0002] Due to its performance advantages, lithium-ion power batteries have become an ideal power source for energy-saving and environmentally friendly electric vehicles such as pure electric vehicles and plug-in hybrid vehicles. In recent years, higher and higher requirements have been placed on the energy density and cycle life of lithium-ion batteries to meet the continuous improvement of the mileage and service life of electric vehicles. Cathode material is a key factor determining the performance of lithium-ion batteries, directly affecting the energy density, specific power characteristics, temperature characteristics and safety characteristics of the battery. In the current technology, lithium iron phosp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/505H01M10/0525B82Y30/00
CPCY02E60/122H01M4/131H01M4/505H01M4/625H01M10/0525H01M10/44H01M10/446Y02E60/10
Inventor 王驰伟马华孙翠平从长杰
Owner TIANJIN ENERGIES
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