Foam nickel substrate Sn/SnO/SnO2 layered three-dimensional porous negative electrode material and preparation method thereof
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A three-dimensional porous, negative electrode material technology, applied in the direction of battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of poor cycle performance, high cost of tin oxide negative electrode materials, complicated preparation process, etc., to achieve high porosity, suitable for The effect of industrial production and stable chemical properties
Inactive Publication Date: 2016-05-04
XIANGTAN UNIV
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[0008] The purpose of the present invention is to provide a nickel-foamed Sn / SnO / SnO 2 Layered three-dimensional porous negative electrode material and preparation method thereof
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Embodiment 1
[0055] Nickel foam is selected as the electroplating substrate. figure 1 A schematic diagram of the design process for the entire experiment, figure 2 SEM image of nickel foam without any treatment.
[0056] (1) Pretreatment of nickel foam
[0057] For degreasing treatment, the solution configuration is as follows:
[0058]
[0059] Then carry out activation treatment, the solution configuration is as follows
[0060]
[0061] (2) Preparation of electroplating tin solution and anodizing solution
[0062] The formula and conditions for preparing the electroplating tin solution are as follows:
[0063]
[0064] (3) Put the nickel foam into the prepared tin plating solution, and the electroplating times are 300s, 500s, 700s, 900s, 1000s, and 1300s, respectively, to obtain electroplated tin samples.
[0065] (4) Put the sample obtained by electroplating in step (3) into an oxidizing solution, and perform anodizing treatment. The anodizing time is 200s, 300s, and 400...
Embodiment 2
[0075] In combination with Embodiment 1, a plating time of 300 s and an oxidation time of 200 s was selected as the experimental sample, and the remaining steps were the same as those of Embodiment 1. Using the conventional lithium-ion battery test method, the first charge-discharge specific capacity of the negative electrode effective material was 837mAh / g, and after 40 cycles, there was still 306mAh / g, and the average Coulomb efficiency reached 95%. The cycle performance is shown in the figure below. Image 6 shown.
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Abstract
The invention discloses a foam nickel substrate Sn / SnO / SnO2 layered three-dimensional porous negative electrode material and a preparation method thereof. The foam nickel substrate Sn / SnO / SnO2 layered three-dimensional porous negative electrode material comprises a nickel foam as a current collector and a Sn / SnO / SnO2 layered three-dimensional porous structure attached to the nickel foam surface. The preparation method comprises the following steps: firstly, performing a surface pretreatment on the nickel foam with a three-dimensional structure; secondly, placing a processed nickel foam substrate into a tin plating solution and electroplating, and then performing an anodic oxidation treatment on the obtained material and vacuum drying; and finally, the negative electrode material of a foam nickel substrate Sn / SnO / SnO2 layered three-dimensional porous structure can be prepared. A layered three-dimensional porous lithium ion battery negative electrode material of the invention has an excellent electromechanical performance, the first discharge specific capacity can reach 837 mAh / g, and after 40 cycles, and the average coulombic efficiency is maintained at about 95%. The preparation process of the invention is simple, the prepared negative electrode material is excellent in performance and large-scale industrial production can be carried out.
Description
technical field [0001] The invention belongs to the field of lithium ion battery manufacturing, relates to a lithium ion battery negative electrode material and a preparation method thereof, in particular to a foamed nickel-based Sn / SnO / SnO 2 Layered three-dimensional porous negative electrode material and preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in hybrid electric vehicles, electric vehicles, portable electronic products and other equipment due to their long cycle life, high energy density, low self-discharge characteristics and no pollution. The energy density, cycle life and safety of batteries put forward higher requirements. As one of the core components of lithium-ion batteries, the negative electrode material has an important influence on improving the capacity and cycle life of lithium-ion batteries. The currently commercialized negative electrode materials are carbon materials, and their practical application c...
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