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Thermal stability evaluation method of lithium ion battery electrode material

A lithium-ion battery and electrode material technology, which is applied in the field of thermal stability evaluation of lithium-ion battery electrode materials, can solve the problems of lithium-ion battery fire, explosion, combustion, battery fire, etc., and achieves the effect of reducing the risk of thermal runaway

Pending Publication Date: 2021-03-16
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Many studies have shown that it is the decomposition of the positive electrode material that causes the fire and explosion of the lithium-ion battery, especially when the positive electrode material is in a higher state of charge, it is thermally unstable, and there is a risk of thermal runaway, which in turn causes the combustion of the electrolyte. Eventually lead to fire or even explosion of the battery

Method used

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  • Thermal stability evaluation method of lithium ion battery electrode material
  • Thermal stability evaluation method of lithium ion battery electrode material
  • Thermal stability evaluation method of lithium ion battery electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] S1. Set the preset temperature T=260°C;

[0025] S2. Under an inert atmosphere, disassemble the LFP battery cell under 100% SOC state to obtain the negative pole piece, then soak the negative pole piece in DMC for 30 minutes to remove the electrolyte, after drying, scrape powder and grind it to obtain Anode material powder;

[0026] S3. Under an inert atmosphere, put the negative electrode material powder into an alumina crucible, and conduct a TG test at a heating rate of 10k / min. The termination temperature of the test is 800°C, and obtain the exothermic temperature T of the reaction between the negative electrode material and the electrolyte. 1 =439.68°C;

[0027] Under an inert atmosphere, put the negative electrode material powder into a high-pressure crucible, and conduct a DSC test at a heating rate of 10k / min. The test termination temperature is 400°C, and the thermal decomposition temperature T of the negative electrode material is obtained. 2 = 280.83°C;

...

Embodiment 2

[0030] S1. Set the preset temperature T=120°C;

[0031] S2. Under an inert atmosphere, disassemble the LFP battery cell under 100% SOC state to obtain the positive pole piece, then soak the positive pole piece in DMC for 30 minutes to remove the electrolyte, after drying, scrape powder and grind it to obtain Cathode material powder;

[0032] S3. Under an inert atmosphere, put the positive electrode material powder into an alumina crucible, and conduct a TG test at a heating rate of 10k / min. The termination temperature of the test is 800°C, and obtain the exothermic temperature T of the reaction between the positive electrode material and the electrolyte. 1 = 218.60°C;

[0033] Under an inert atmosphere, put the positive electrode material powder into a high-pressure crucible, and conduct a DSC test at a heating rate of 10k / min. The termination temperature of the test is 200°C, and obtain the thermal decomposition temperature T of the positive electrode material. 2 =125.80°C;...

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Abstract

The invention discloses a thermal stability evaluation method of a lithium ion battery electrode material. The thermal stability evaluation method comprises the following steps: S1, setting a preset temperature T; S2, disassembling the battery cell in a 100% SOC state to obtain an electrode material; S3, obtaining the heat release temperature T1 of the reaction of the electrode material and the electrolyte and the thermal decomposition temperature T2 of the electrode material; and S4, comparing T1 and T2 with T, and evaluating whether the thermal stability of the electrode material is qualified or not. The invention provides a simple and reliable electrode material thermal stability evaluation method, which is helpful for simply, quickly, accurately and effectively screening a proper lithium ion battery electrode material and reducing the thermal runaway risk of a lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of battery testing, in particular to a method for evaluating thermal stability of lithium-ion battery electrode materials. Background technique [0002] Among all current battery systems, lithium-ion batteries can better meet the vehicle's requirements for power output, driving distance, acceleration capability, service life and energy density. However, due to its thermal instability, combustion or explosion may occur under extreme conditions, which greatly hinders the practical application of large-scale lithium-ion batteries. That is, among the many factors affecting the safety performance of lithium-ion batteries, the thermal stability of electrode materials determines the upper and lower limits of the actual use of lithium-ion batteries. Many studies have shown that it is the decomposition of the positive electrode material that causes the fire and explosion of the lithium-ion battery, especially when t...

Claims

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Application Information

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IPC IPC(8): G01N25/12
CPCG01N25/12
Inventor 薄少国胡淑婉张峥
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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