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Lithium ion battery anode and preparation method thereof

A lithium-ion battery and positive electrode technology, applied in battery electrodes, battery components, circuits, etc., can solve the problems of low mechanical strength, low film-making efficiency, and film size limitation, and achieve low quality and high film-making efficiency , the effect of increasing energy density

Active Publication Date: 2014-04-09
北京旭江科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the problems of the current production method, the carbon nanotube film current collector has the following shortcomings: (1) The efficiency of film production is low, the size of the film is limited, and the mechanical strength is not high; (2) Although the tabs can be connected, However, conductive glue is used to connect the tabs and the current collector. The conductive glue introduced not only increases the weight of the pole piece, but also the conductive glue is easily aged after being soaked in the electrolyte for a long time; (3) The electrode material layer is formed first in the electrode manufacturing process, and then the electrode The carbon nanotube film layer is formed on the material layer, which is too different from the process of coating the electrode slurry layer on the current collector in the traditional lithium-ion battery production. If it is to be used in actual production, it means that the factory needs a lot of Scale the production line, the cost is too high

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Preparation of the positive electrode of the button battery: Spray 30% alcohol aqueous solution on the glass substrate (20cm×20cm) and the glass rod, and pull the macroscopic tube continuum formed from the reactor port to the square glass substrate with the glass rod. In the form of vertical and horizontal graticules, a carbon nanotube film with a thickness of about 10 μm will be obtained on the glass substrate. The active material (LiCoO 2 ), conductive agent (Super-P), binder (polyvinylidene fluoride) mixed with NMP at a ratio of 90:4:6 (solid content kept at 45%), and put into a ball mill for ball milling for 10 hours at a speed of 232rmin -1 , to obtain positive electrode slurry. Keep the edge of the scraper at 180 μm, apply a layer of slurry evenly on the film, and put it in an oven at 120°C for 40 minutes. Subsequently, lay the glass substrate with the coated carbon nanotube film layer flat, dip the NMP with a brush, and brush lightly on the area of ​​the carbon...

Embodiment 2

[0031] Preparation of the positive electrode of single-layer laminated battery: Spray 30% alcohol aqueous solution on the glass substrate (20cm×36cm) and the glass rod, and pull the macroscopic tube continuum formed from the reactor port to the square glass substrate with the glass rod . In the form of vertical and horizontal graticules, a carbon nanotube film with a thickness of about 13 μm will be obtained on the glass substrate. The active material (LiCoO 2 ), conductive agent (Super-P), binder (polyvinylidene fluoride) mixed with NMP in a ratio of 90:4:6 (solid content 45%), put into a ball mill for 12 hours, and the speed is 232rmin -1 , to obtain positive electrode slurry. The method of "knife moving and film fixing" is adopted, that is, the glass plate carrying the film does not move, the scraper moves the knife on the film with a 230 μm knife edge, and the positive electrode slurry is coated on the carbon nanotube film in the "gap coating" method. The size of each c...

Embodiment 3

[0033] Preparation of positive electrode of multi-layer laminated battery: Spray 30% alcohol aqueous solution with volume fraction on glass substrate (20cm×36cm) and glass rod, and pull the macroscopic tube continuum formed from the reactor port to square glass substrate with glass rod . A carbon nanotube film with a thickness of about 13 μm will be obtained on the glass substrate in the form of vertical and horizontal graticules. The active material (LiCoO 2 ), conductive agent (Super-P), binder (polyvinylidene fluoride) mixed with NMP in a ratio of 90:4:6 (solid content 45%), and put into a ball mill for 12 hours at a speed of 248rmin -1 , to obtain positive electrode slurry. Using the method of "knife moving film fixed", the scraper moves the knife on the film with a 230μm knife edge, and coats the positive electrode slurry on the carbon nanotube film in gaps. The size of each coating is 8cm×18cm, and the gap width is 4cm. The specific situation See figure 1 . After co...

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Abstract

The invention discloses a lithium ion battery anode and a preparation method thereof. The anode utilizes a carbon nano pipe film formed by a carbon nano pipe macroscopic pipe as a current collector, and an anode material layer is formed on the carbon nano pipe film. Compared with the traditional aluminum foil current collector anode, the lithium ion battery anode has the advantages that the weight of the lithium ion battery anode prepared by the method is light, and the anode material layer and the current collector are firmly combined. The preparation method comprises the following steps of preparing a high strength carbon nano pipe on a glass substrate by utilizing a carbon nano pipe macroscopic pipe continuum generated by a reactor port, generating the anode material layer on the carbon nano pipe film layer, separating the carbon nano pipe film layer with the anode material layer from and the glass substrate, and mounting a pole ear on a pole piece. Under the same size, the carbon nano pipe film is far lighter than the aluminum foil, the weight of the saved part can be replaced by the anode material, and the capacity of the battery is 15%-50% higher than that of a battery which takes the aluminum foil as an anode current collector. The lithium ion battery anode is low in cost, high in generation efficiency, simple in equipment, capable of realizing semicontinuous operation and suitable for mass production.

Description

technical field [0001] The invention relates to the technical field of battery manufacturing, in particular to a positive electrode of a lithium ion battery and a preparation method thereof. Background technique [0002] The most widely used power source in the field of mobile devices today is lithium-ion batteries, and its main parts include positive electrodes, negative electrodes, separators, electrolytes, and outer shells. Among them, electrode fabrication is the core technology in the manufacturing process of lithium-ion batteries. The positive electrode includes a positive electrode current collector (including tabs) and a positive electrode material layer uniformly formed on the surface of the current collector. The tiny current generated by the active particles in the electrode material layer needs to be gathered together through the current collector and output to the external circuit in the form of a larger current. The tabs can cooperate with the current collector...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/62H01M4/1393
CPCY02E60/122H01M4/131H01M4/1391H01M4/663H01M50/531Y02E60/10
Inventor 钟盛文胡经纬吴子平
Owner 北京旭江科技有限公司
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