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Copper current collector surface nanocrystallization method

A current collector and nanotechnology, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems of active material pulverization, failure, volume change, etc., and achieve electrochemical performance improvement, The method is simple and the effect of increasing the specific surface area

Active Publication Date: 2019-05-28
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0005] In order to solve the problems of volume change, pulverization and failure of active material in existing lithium-ion battery negative electrode materials after improving the lithium storage capacity, the present invention provides a method for nanometerizing the surface of copper current collectors

Method used

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  • Copper current collector surface nanocrystallization method
  • Copper current collector surface nanocrystallization method
  • Copper current collector surface nanocrystallization method

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Embodiment 1～5

[0039] A method for surface nanometerization of a copper current collector, said method comprising the following steps:

[0040] 1) Alkaline solution is configured, the pretreated copper substrate is placed in the alkaline solution for erosion treatment, and after the erosion is completed, it is dried to obtain a pre-substrate;

[0041] 2) The pre-matrix is ​​used as a working electrode, platinum or graphite is used as a counter electrode, and a saturated calomel electrode is used as a reference electrode, and the pre-matrix is ​​reduced by a three-electrode system in the electrolyte to form a porous template;

[0042] 3) Prepare an electrodeposition solution containing active metal ions, use a porous template as a working electrode, platinum or graphite as a counter electrode, and a saturated calomel electrode as a reference electrode, and place it in the electrodeposition solution using a three-electrode system in the pores of the porous template. Deposit active metal oxides...

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Abstract

The invention relates to the field of lithium ion batteries, in particular to a copper current collector surface nanocrystallization method. The method comprises the following steps: 1) preparing an eroded copper matrix and pre-matrix; 2) reducing the pre-matrix to prepare a porous template; 3) depositing active metal to prepare an activated template; 4) preparing a precursor by utilizing an anodedissolution principle; and 5) calcining to prepare a copper current collector with active metal and carbon deposited on the surface and forming a nano structure. The method is simple, high in repeatability and good in controllability; the three-dimensional nano-copper is electrochemically inert and stable in structure; due to the structure of the three-dimensional nano-copper, diffusion channelsof lithium ions are greatly reduced, polarization is reduced, and the cycle performance and the rate capability can be improved to a great extent; the electrochemical performance of the electrode material is further improved by depositing active metal elements and further improving the specific surface area of a nano structure of the electrode material; and the negative electrode material preparedby the method does not need a binder or a conductive agent, so that the specific capacity of a battery is improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for nanometerizing the surface of a copper current collector. Background technique [0002] Lithium-ion batteries have the advantages of high operating voltage, high specific capacity, good safety performance, strong environmental compatibility, no memory effect, wide operating temperature range, small self-discharge and long cycle life, and are currently widely used in computers, portable batteries, etc. Important fields such as electronic devices, electric vehicles, medical technology, the defense industry, and even aerospace. [0003] At present, the main negative electrode material in the market is carbon material. Graphite has the advantages of high specific capacity, suitable charging potential distribution, large quantity and low price, and actual capacity of 300-330mAh / g. However, the theoretical peak value of its first charge and discharge efficiency is Lim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/04H01M4/66H01M4/80H01M10/0525B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 唐谊平沈康侯广亚郑国渠
Owner ZHEJIANG UNIV OF TECH
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