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

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...

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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.

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