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Characterization method for hardness of electrode materials under combined action of electrochemistry and substrate effects

A technology of electrode material and substrate effect, which is applied in the field of research on the characterization of mechanical properties of energy materials, and can solve problems such as characterization methods that do not comprehensively consider hardness

Active Publication Date: 2016-05-11
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no characterization method that comprehensively considers the hardness under the joint action of electrochemical and substrate effects in the world.

Method used

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  • Characterization method for hardness of electrode materials under combined action of electrochemistry and substrate effects
  • Characterization method for hardness of electrode materials under combined action of electrochemistry and substrate effects
  • Characterization method for hardness of electrode materials under combined action of electrochemistry and substrate effects

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Experimental program
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Embodiment 1

[0037] The specific implementation steps are as follows:

[0038] The first step is to determine the concentration distribution of lithium ions inside the electrode material by solving the diffusion equation:

[0039] Based on two-dimensional thin film electrode materials, the maximum lithium ion concentration c 0 And the diffusion coefficient D is assumed to be a constant, which does not change with the change of the charging and discharging process, and L is the film thickness at time t. Thus, the lithium ion concentration distribution of the two-dimensional thin film material in a certain state can be obtained as:

[0040] c = c 0 [ 1 - Σ n = 0 ∞ 4 ( - 1 ) ...

Embodiment 2

[0051] The specific implementation steps are as follows:

[0052] The first step is the selection of Si negative electrode material for lithium ion battery

[0053] A Si film with a thickness of 1.4 μm was prepared by magnetron sputtering [L.A.Berla, S.W.Lee, Y.CuiandW.D.Nix, J.PowerSources, 2015, 273, 41-51], and then assembled into a button Batteries, through the method of constant current control to obtain Si negative electrode materials with different electric quantities.

[0054] The second step is to conduct indentation experiments on Si anode materials under different charge and discharge states

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Abstract

The invention discloses a characterization method for hardness of electrode materials under the combined action of electrochemistry and substrate effects. The method includes the steps that a charging and discharging test is conducted on the electrode materials of a lithium ion battery to obtain the electrode materials in different charging and discharging states, and an indentation experiment is conducted on the electrode materials through an indentation tester to obtain an indentation load displacement curve, so that the composite hardness between the electrode materials and a substrate is extracted under a certain charging and discharging state, and finally the composite hardness is substituted into a constructed analytic theoretical model between the hardness and the indentation size to obtain the hardness of the electrode materials. The hardness of the electrode materials of the lithium ion battery in different charging and discharging states can be successfully extracted by using the analytic theoretical model obtained through the method, and the characterization method is convenient, fast and beneficial for large-scale engineering application.

Description

technical field [0001] The invention relates to a method for characterizing the hardness of electrode materials under the joint action of electrochemical and substrate effects, and belongs to the field of research on the mechanical properties of energy materials. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high power density, good safety performance, long cycle life, etc., and do not contain lead, cadmium, mercury and other pollutants, so they are an ideal energy storage device. As one of the core components of lithium-ion batteries, anode materials have an important impact on improving the capacity and cycle life of lithium-ion batteries, and have received great attention from academia and industry. The negative electrode material that has been produced industrially is carbon material, and its theoretical specific capacity is 372mAhg -1 , the capacity of carbon anode in practical application is already very close to its t...

Claims

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Application Information

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IPC IPC(8): G01N3/40H01M4/36H01M10/0525
CPCG01N3/40H01M4/36H01M10/0525Y02E60/10
Inventor 马增胜张晶雷维新邹幽兰潘勇
Owner XIANGTAN UNIV
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