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Porous aluminum-foil cathode, preparation method of porous aluminum-foil cathode and lithium secondary battery

A lithium secondary battery, aluminum foil technology, applied in the direction of secondary batteries, lithium storage batteries, battery electrodes, etc., can solve the problems of aluminum foil volume expansion, electrolyte compatibility, affecting charge and discharge efficiency, cycle performance and safety performance, etc. The effect of decomposition, improvement of stability and safety, and improvement of charge and discharge efficiency

Inactive Publication Date: 2017-05-10
REAL POWER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In 2016, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences made a breakthrough in the research of new high-efficiency batteries, and developed a new aluminum-graphite dual-ion battery technology. The research results were published on "Advanced Energy Materials" (DOI: 10.1002 / aenm.201502588), this new type of high-efficiency battery system uses aluminum foil as the negative electrode sheet, and the aluminum foil acts as the current collector and negative electrode active material at the same time. Due to the reduction of traditional negative electrode active materials, the specific energy density is higher and the cost is lower. It has great applications However, the battery system has problems of aluminum foil volume expansion and electrolyte compatibility during the working process, which affects the charge and discharge efficiency, cycle performance and safety performance.

Method used

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  • Porous aluminum-foil cathode, preparation method of porous aluminum-foil cathode and lithium secondary battery
  • Porous aluminum-foil cathode, preparation method of porous aluminum-foil cathode and lithium secondary battery
  • Porous aluminum-foil cathode, preparation method of porous aluminum-foil cathode and lithium secondary battery

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Effect test

Embodiment 1

[0052] A preparation method of a porous aluminum foil negative electrode, comprising the following steps:

[0053] (1) The aluminum foil with a thickness of 50 microns is designed according to the design parameters that the area of ​​the holes in each minimum unit is 25%, the diameter of the holes is 1 mm, the hole shape is a round hole, and the distance between the edge of the outermost hole and the edge of the aluminum foil is 2 mm, The porous aluminum foil is processed and manufactured by mechanical molding, and the burrs are removed by purging with compressed air;

[0054] (2) The porous aluminum foil was then immersed in an aqueous solution containing 20% ​​polyvinylpyrrolidone for 10 minutes, and then the above-mentioned porous aluminum foil was placed in a sintering furnace filled with nitrogen and heated to 400°C at a rate of 3°C / min, and heated to 400°C at a rate of 3°C / min. The porous aluminum foil negative electrode can be obtained by carbonization treatment at a co...

Embodiment 2-38

[0061] Referring to the specific steps of Embodiment 1, different Embodiments 2-38 can be obtained by adjusting the relevant parameters. Specific embodiment parameters and test results are shown in Table 1:

[0062] Table 1

[0063]

[0064]

[0065]

Embodiment 39

[0067] A preparation method of a porous aluminum foil negative electrode, comprising the following steps:

[0068] (1) The aluminum foil with a thickness of 20 microns is designed according to the design parameters that the area ratio of the holes in each smallest unit is 25%, the diameter of the holes is 1 mm, the shape of the holes is round holes, and the distance between the edge of the outermost hole and the edge of the aluminum foil is 2 mm, The porous aluminum foil is processed and manufactured by mechanical molding, and the burrs are removed by purging with compressed air;

[0069] (2) The porous aluminum foil was then soaked in an aqueous solution containing 20% ​​polyvinylpyrrolidone for 10 minutes, and then the above-mentioned porous aluminum foil was placed in a sintering furnace with an inert gas or a reducing gas and heated to 400°C at a rate of 3°C / min , and carbonized at a constant temperature of 400 °C for 4 hours to obtain a porous aluminum foil negative elect...

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Abstract

The invention provides a porous aluminum-foil cathode. The porous aluminum-foil cathode comprises a porous aluminum foil; porous holes which are uniformly arranged are formed in the porous aluminum foil; triangular areas formed by connecting the centers of every three adjacent holes are taken as minimum units; the area ratio of the holes in each minimum unit is 10-79%; and the distance between the porous aluminum foil and the outermost porous hole is 0.1-10mm. The porous aluminum-foil cathode can be applied in a novel lithium-ion battery system which takes the aluminum foil as a current collector and a cathode active material at the same time, and has the effects of effectively solving the battery expansion problem, effectively reducing the problem that the solid electrolyte membranes are damaged to decompose in the battery charge-discharge cycle process of electrolyte, and effectively reducing the short-circuit problem caused by puncturing the membranes by burs of the aluminum foil, so as to improve the charge-discharge efficiency, cycling stability and safety of the batteries. The invention furthermore provides a preparation method of the porous aluminum-foil cathode and a lithium secondary battery.

Description

technical field [0001] The invention relates to the technical field of lithium secondary batteries, in particular to a porous aluminum foil negative electrode and a preparation method thereof, and a lithium secondary battery. Background technique [0002] In 2016, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences made a breakthrough in the research of new high-efficiency batteries and developed a new aluminum-graphite dual-ion battery technology. The research results were published in Advanced Energy Materials (DOI: 10.1002 / aenm.201502588), this new high-efficiency battery system uses aluminum foil as a negative electrode sheet, and aluminum foil acts as a current collector and negative electrode active material at the same time. Due to the reduction of traditional negative electrode active materials, it has higher specific energy density and lower cost, and has great applications. However, the battery system has the problems of volume expansion of alum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/80H01M4/66H01M4/134H01M4/1395H01M10/052H01M10/0525
CPCH01M4/134H01M4/1395H01M4/661H01M4/801H01M10/052H01M10/0525Y02E60/10
Inventor 唐永炳谢呈德
Owner REAL POWER IND LTD
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