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Method of measuring electrochemical kinetic parameters of electrode active material

A technology of electrode active materials and kinetic parameters, applied in the direction of material electrochemical variables, measuring electricity, measuring electrical variables, etc., can solve the problem that the diffusion coefficient of positive electrode materials cannot be obtained

Active Publication Date: 2016-10-26
未名电池科技(深圳)有限公司
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Problems solved by technology

[0003] Now most people just use the equation To estimate the diffusion coefficient, but the diffusion coefficient measured in this way is the average diffusion coefficient of the solid phase and liquid phase and other factors, and the diffusion coefficient of the positive electrode material itself cannot be obtained.
The interface reaction is generally measured by the Tafel line method, but this method can only be applied to relatively slow reactions

Method used

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  • Method of measuring electrochemical kinetic parameters of electrode active material
  • Method of measuring electrochemical kinetic parameters of electrode active material
  • Method of measuring electrochemical kinetic parameters of electrode active material

Examples

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Embodiment

[0044] 1. Preparation of positive electrode active materials

[0045] In this example, lithium iron phosphate is used as the positive electrode active material for testing, and carbon coating is carried out on lithium iron phosphate, as follows:

[0046] FeSO 4 ·7H 2 O (AR, 99%), H 3 PO 4 (AR,85% solution) and LiOH·H 2 O(AR, 95%) is dissolved in ethylene glycol at room temperature as a raw material, and the ratio of the amount of the three substances is 1:1.275:2.7. The order of addition was as follows: firstly, the LiOH solution was added to the three-necked flask and kept stirring in the nitrogen atmosphere, and then the H 3 PO 4 and FeSO 4 , after stirring for 30 minutes, the mixed solution was heated at 180° C. for 4 hours. After cooling to room temperature, the reflux product was washed, and then dried in a vacuum oven at 70° C. for 3 hours. The dried sample was mixed with 18.5wt% glucose and 1.5wt% Vc, and then calcined at 650° C. for 6 hours under an argon atmo...

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Abstract

The invention discloses a method of measuring electrochemical kinetic parameters of an electrode active material. The method includes: measuring charging and discharging curves and cyclic voltammetry curve of a positive electrode; studying the charging and discharging curves according to data obtained by measuring and simulating the cyclic voltammetry curve according to Fick diffusion laws and formulas I, II, III and IV to obtain diffusion coefficient and interface reaction constant of the electrode active material. Compared with conventional Nernst equation fitting, the method has the advantages that interference of internal factors like concentration polarization can be eliminated, some characteristic parameters which are most intrinsic of the electrode active material can be reflected truly, and the method has quite high value in the field of academic research; a scientific method is provided for comprehensive and in-depth understanding of the electrode active material, and a theoretical basis is provided for designing batteries more reasonably.

Description

technical field [0001] The present application relates to the field of battery material measurement, in particular to a method for measuring electrochemical kinetic parameters of electrode active materials. Background technique [0002] The rapidly developing secondary battery industry constitutes an important part of the new energy field. Lithium-ion batteries have attracted much attention since they were successfully developed, especially in equipment such as electric vehicles, emergency power reserves, energy storage facilities for wind and solar power generation, and auxiliary power supplies for vehicles. The performance of a lithium-ion battery largely depends on its cathode material. The cathode material of a lithium-ion battery is an important factor affecting battery capacity and is also the main technical bottleneck for the development of high-capacity lithium-ion batteries. The current cathode materials for lithium-ion batteries are mainly LiMPO 4 (where M is Fe,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48G01R31/36H01M10/0525
CPCG01N27/48G01R31/3828H01M10/0525Y02E60/10
Inventor 潘锋李文林原胡江涛
Owner 未名电池科技(深圳)有限公司
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