3D porous current collector and preparation method and application thereof

A porous current collector, 3D technology, applied in the field of energy storage, can solve the problems of high reactivity, active material consumption, aggravation, etc., to achieve the effect of increasing the specific surface area and reducing the local current density
CN109301255AInactive Publication Date: 2019-02-01武汉瑞科美新能源有限责任公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
武汉瑞科美新能源有限责任公司
Publication Date
2019-02-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a 3D porous current collector and a preparation method and application thereof. The preparation method herein includes: punching a copper foil to obtain a disc, washing the disc sequentially with acetone, ethanol, hydrochloric acid and deionized water, soaking the washed disc in a mixed solution of ammonium persulfate and sodium hydroxide for 15 min, taking out, washing sequentially with deionized water and ethanol, drying in air for 12 hours, heating from room temperature to 180 DEG C, holding the temperature for 4 hours, cooling with a gas to room temperature to obtain the 3D porous current collector. A layer of copper oxide nanowire array is grown on a copper foil by an in-situ process herein; the presence of the copper oxide nanowire array helps increase the specific surface area of the current collector, and reduce local current density of electrode surface; a battery with the current collector provided herein has coulombic efficiency kept to 90% and aboveafter 100 cycles under normal temperature and the current density of 0.5 to 1 mA / cm<2>.
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Description

technical field

[0001] The invention relates to the technical field of energy storage, in particular to a 3D porous collector and its preparation method and application. Background technique

[0002] With the successful commercial application of graphite anodes, lithium-ion batteries have been widely used in portable electronic devices such as smartphones and laptops.

[0003] Lithium metal batteries with metallic lithium as the negative electrode, including lithium-sulfur batteries, lithium-oxygen batteries, and lithium-oxide batteries, exhibit extremely high theoretical energy densities (lithium-oxygen batteries: 3500Wh kg -1 , lithium-sulfur battery: 2600Wh kg -1 , lithium oxide battery: 1000-1500Wh kg -1 , the current lithium-ion battery: 500-1000Wh·kg -1 ). Among them, lithium metal has the lowest density in nature (0.53g / cm 3 ), the metal element with the lowest standard potential (-3.04V vs. SHE), the lowest electrochemical equivalent (0.26g / Ah), and the highest ...

Claims

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