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Method for evaluating heat production rate in charging/discharging process of sodium-ion battery

A sodium-ion battery and discharge process technology, applied in the direction of secondary battery charging/discharging, secondary battery repair/maintenance, secondary battery, etc. question

Pending Publication Date: 2021-04-20
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] At this stage, there are in-depth explorations on the basic theories such as the sodium storage mechanism of the positive and negative electrodes of the sodium ion battery, the structural evolution during the charging and discharging process, and the interface reaction between the electrode and the electrolyte. The research is mainly calorimetry, that is, the temperature change is directly measured during the charging and discharging process of the sodium-ion battery, and the heat production rate is determined according to the temperature change. However, the heat production rate obtained in this way is the total heat production rate and cannot react with sodium ions. The intrinsic electrochemical mechanism of the battery is not easy to optimize the sodium-ion battery

Method used

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  • Method for evaluating heat production rate in charging/discharging process of sodium-ion battery
  • Method for evaluating heat production rate in charging/discharging process of sodium-ion battery
  • Method for evaluating heat production rate in charging/discharging process of sodium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The battery to be tested selected in embodiment 1 and embodiment 2 is all Na 3 V 2 (PO 4 ) 3 @C / Na sodium ion battery, which is a typical sodium ion battery composed of a typical polyanionic compound positive electrode material and a sodium metal negative electrode. Its model is CR2032 button battery, with a diameter of 7.9mm, a thickness of 3.6mm, and a volume of 1.765*10 -4 L. The surface of the battery to be tested is covered with thermal insulation cotton, and the electrochemical test is carried out in a sealed environment. Wherein embodiment 1 is directed at charging to the performance under different SOCs in the charging process, and embodiment 2 is directed at discharging to the performance under different SODs in the discharging process, as other embodiment also can follow the performance of charging to different SOCs, Discharge to evaluate the performance under different SOD.

[0041] Example 1

[0042] 1. Perform a constant current charge and discharge ...

Embodiment 2

[0076] This example is aimed at Na 3 V 2 (PO 4 ) 3 @C / Na battery heat generation rate during the discharge process, in order to realize the analysis of thermodynamics and kinetics during the discharge process of the sodium ion battery, the process is similar to the charging process in Example 1, the specific process is as follows.

[0077] 1. Conduct constant current charging and / or discharging tests on the battery to be tested to stabilize the electrochemical performance of the battery to be tested.

[0078] Before the test, check that the equipment is in good condition, and ensure that the temperature of the battery and the ambient temperature reach a state of thermal equilibrium (the process is the same as in Example 1). Na 3 V 2 (PO 4 ) 3 The @C / Na battery is connected to the positive and negative fixtures of the MACRRO battery tester, and the program is set. Start the test when the battery temperature and the room temperature reach thermodynamic equilibrium. At r...

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Abstract

The invention relates to a method for evaluating the heat production rate in the charging / discharging process of a sodium-ion battery, and belongs to the technical field of sodium-ion batteries. In consideration of the characteristics of stable open-circuit voltage and few side reactions of the organic electrolyte of the sodium-ion battery, a potential method is adopted to measure voltage temperature change coefficients of the sodium-ion battery when the sodium-ion battery is charged and discharged to different charged states, entropy change is calculated by utilizing the voltage temperature change coefficients, and the reversible heat production rate is obtained according to the entropy change. The accuracy of the reversible heat production rate is further improved; meanwhile, the diffusion of Na<+> of the sodium ion battery in the organic electrolyte and the solid particles is considered, the overpotential caused by the internal resistance of the battery is tested by adopting a constant-current intermittent titration technology, the measured overpotential value is more accurate, and then the accurate irreversible heat production rate can be obtained. The method can analyze the heat production rule of the battery and the contribution of the heat production rate source of each part to the total heat production rate, and provides guarantee for optimizing battery design and optimizing a battery heat management system.

Description

technical field [0001] The invention relates to a method for evaluating heat production rate during charging / discharging of a sodium ion battery, belonging to the technical field of sodium ion batteries. Background technique [0002] In recent years, the fossil energy crisis and environmental protectionism have gradually shifted people's attention to new sustainable secondary energy sources. As energy storage batteries that have been commercially applied and have relatively mature application technologies, lithium-ion batteries have long cycle life and work With the advantages of high voltage, high capacity, small self-discharge, stable discharge performance, wide operating temperature range, no memory effect, and long cycle life, it has almost occupied the "4C" market ("4C" market is consumer electronics, computer, network, etc.) And the four major communication application markets). At present, lithium-ion batteries, as energy storage power batteries, have been widely use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36G01R31/385G01R31/387H01M10/054H01M10/44G01N25/48
CPCY02E60/10
Inventor 毛景位方林张鹏张巧平代克化邵国胜
Owner ZHENGZHOU UNIV