Preparation method for lithium ion battery anode piece, and anode piece prepared by the same

A technology of lithium-ion batteries and positive pole pieces, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve problems such as cost pollution, achieve the effects of reducing electrode polarization, reducing transmission distance, and good cycle performance

Active Publication Date: 2012-03-14
甘肃大象能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] On the one hand, the object of the present invention is to solve the cost problem and pollution problem existing in the existing pole piece manufacturing process; Porosity increases the bulk density, reduces the transmission distance of electrons and lithium ions between active material particles, reduces the internal resistance of the pole piece, and improves the high-current charge and discharge performance of lithium batteries

Method used

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  • Preparation method for lithium ion battery anode piece, and anode piece prepared by the same
  • Preparation method for lithium ion battery anode piece, and anode piece prepared by the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The process of making positive pole pieces of lithium-ion batteries by cold spraying technology includes the following steps:

[0046] (1) Use aluminum foil with a thickness of 20 μm as the current collector, wash it with alkali first, then clean it with deionized water and dry it, and place it flat on the working table of the spraying system.

[0047] (2), take D by mass percentage example 95% and 5% respectively 50 =10μm positive electrode active material LiFePO 4 and D 50 = 5 μm conductive agent copper powder, ultrasonically dispersed and mixed evenly. With He as the working gas, turn on the cold spraying device system, and put the uniformly mixed electrode material into the powder feeder of the cold spraying device system.

[0048] (3), LiFePO 4 The mixed electrode material particles with copper powder are sent into the spray gun through the powder feeder gas He in the powder feeder of the cold spray system, and then accelerated by the working gas He in the spra...

Embodiment 2

[0052] In this example, N 2 For the working gas, cold spraying is used to make the positive pole piece of lithium-ion battery, including the following steps:

[0053] (1) Use aluminum foil with a thickness of 20 μm as the current collector, wash it with alkali first, then clean it with deionized water and dry it, and place it flat on the working table of the spraying system.

[0054] (2), take D by mass percentage example 95% and 5% respectively 50 =10μm positive electrode active material LiFePO 4 and D 50 = 5 μm conductive agent copper powder, ultrasonically dispersed and mixed evenly. to N 2 For the working gas, turn on the cold spraying device system, and load the uniformly mixed electrode material into the powder feeder of the cold spraying device system.

[0055] (3), LiFePO 4 The mixed electrode material particles with copper powder are sent into the spray gun through the powder feed carrier gas He in the powder feeder of the cold spray device system, and then pass...

Embodiment 3

[0059] The process of making positive pole pieces of lithium-ion batteries by cold spraying technology includes the following steps:

[0060] (1) Use aluminum foil with a thickness of 20 μm as the current collector, wash it with alkali first, then clean it with deionized water and dry it, and place it flat on the working table of the spraying system.

[0061] (2), take D by mass percentage example 98% and 2% respectively 50 =10μm positive electrode active material LiFePO 4 and D 50 = 5 μm conductive agent copper powder, ultrasonically dispersed and mixed evenly. With He as the working gas, turn on the cold spraying device system, and put the uniformly mixed electrode material into the powder feeder of the cold spraying device system.

[0062] (3), LiFePO 4 The mixed electrode material particles with copper powder are sent into the spray gun through the powder feeder gas He in the powder feeder of the cold spray system, and then accelerated by the working gas He in the spra...

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Abstract

The present invention belongs to the technical field of lithium ion battery preparation, and discloses a preparation method for a lithium ion battery anode piece, and an anode piece prepared by the method. According to the present invention, a cold spray coating technology is adopted to deposit a mixture comprising an anode active material and a conductive agent on an anode current collector to prepare the lithium ion battery anode piece. With adopting the lithium ion battery anode piece prepared by the method of the present invention, the problems of cost and pollution of the anode piece preparation method in the prior art can be solved; the gap between the active material and the current collector, and the gap between the active material particles can be reduced so as to significantly reduce the porosity of the electrode piece, increase the bulk density, reduce the transmission distance of the electrons and the lithium ions in the active material particles, reduce the resistance of the internal resistance of the electrode piece, and improve the high-current charge-discharge performance of the lithium battery. At the same time, with adopting the lithium ion battery anode piece prepared by the method of the present invention, the surface roughness of the electrode piece can be increased, the polarizability of the electrode can be reduced, and the lithium ion battery prepared by using the lithium ion battery anode piece of the present invention has good cycle performance under the high current density.

Description

technical field [0001] The invention belongs to the technical field of manufacturing lithium-ion batteries for chemical power sources. In particular, it relates to a method for manufacturing a positive pole piece of a lithium ion battery, and a positive pole piece produced by the method. Background technique [0002] Since the successful research and development of lithium-ion batteries in 1990, they have played an important role in the field of secondary batteries due to their advantages such as high working voltage, high energy density, low environmental pollution, light weight, low self-discharge rate, good cycle stability, and no memory effect. As a portable power supply, it has been widely used in electronic communication products such as mobile phones, notebook computers, digital cameras, and video cameras, and is increasingly used as a power supply in aerospace, hybrid electric vehicles (HEV) and electric vehicles (EV) and other fields. [0003] On the one hand, in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397
CPCY02E60/10
Inventor 宋宝兴田勇罗绍华诸葛福长沈利亚
Owner 甘肃大象能源科技有限公司
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