A fast evaluation method for thermal storage stability of cathode materials for lithium ion batteries

A thermal storage stability, lithium-ion battery technology, applied in the direction of thermal expansion coefficient of materials

Active Publication Date: 2021-06-22
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing evaluation and testing methods have many drawbacks and deficiencies above. Therefore, it is particularly important and urgent to establish a method that can quickly and accurately evaluate the change of the swelling rate of the positive electrode material after being used in a high temperature environment or stored.

Method used

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  • A fast evaluation method for thermal storage stability of cathode materials for lithium ion batteries
  • A fast evaluation method for thermal storage stability of cathode materials for lithium ion batteries
  • A fast evaluation method for thermal storage stability of cathode materials for lithium ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Four kinds of nickel-cobalt lithium manganese oxide NCM523 ternary cathode materials prepared by a similar process were selected, and the positive electrode sheets were made respectively according to the active material content of 95wt.%. And use the same electrolyte, separator and half-cell accessories to assemble four batches of button half-cells.

[0040]The above four batches of button half batteries were activated by constant current and constant voltage charge and discharge cycle in the range of 3.0~4.35V respectively. The charge and discharge system is as follows: 0.1C charge and discharge for 2 weeks, 0.2C charge and discharge for 1 week, 0.5C charge and discharge for 1 week, 1.0C charge and discharge for 1 week and 2.0C charge and discharge for 1 week, a total of 6 weeks. After the cycle activation is completed, it is charged to 4.35V at a constant current and constant voltage at a rate of 0.1C, and the cut-off current of constant voltage charging is 0.01C.

...

Embodiment 2

[0053] Four kinds of nickel-cobalt lithium manganese oxide NCM622 ternary cathode materials prepared by a similar process were selected, and the positive electrode sheets were respectively made according to the active material content of 92wt.%. And use the same electrolyte, separator and half-cell accessories to assemble four batches of button half-cells.

[0054] The above four batches of button half-cells were activated by constant current and constant voltage charge and discharge cycle in the range of 3.0~4.30V respectively. The charge and discharge system is as follows: 0.1C charge and discharge for 2 weeks, 0.2C charge and discharge for 1 week, 0.5C charge and discharge for 1 week, 1.0C charge and discharge for 2 weeks, 2.0C charge and discharge for 1 week, 5.0C charge and discharge for 1 week and 1.0C charge and discharge 1 week of discharge for a total of 9 weeks. After the cycle activation is completed, it is charged to 4.30V at a constant current and constant voltag...

Embodiment 3

[0066] Four kinds of nickel-cobalt lithium manganese oxide NCM811 ternary cathode materials prepared by a similar process were selected, and the positive electrode sheets were made respectively according to the active material content of 90wt.%. And use the same electrolyte, separator and half-cell accessories to assemble four batches of button half-cells.

[0067] The above four batches of button half batteries were activated by constant current and constant voltage charge and discharge cycle in the range of 3.0~4.25V respectively. The charge and discharge system is as follows: 0.1C charge and discharge for 2 weeks, 0.2C charge and discharge for 2 weeks, 0.5C charge and discharge for 2 weeks, 1.0C charge and discharge for 2 weeks, 2.0C charge and discharge for 2 weeks, 5.0C charge and discharge for 1 week and 1.0C charge and discharge 1 week of discharge for a total of 12 weeks. After the cycle activation is completed, it is charged to 4.25V at a constant current and constan...

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Abstract

The present invention provides a method for quickly evaluating the high-temperature storage stability of lithium-ion battery positive electrode materials combined with differential scanning calorimetry: a) A button half-battery is prepared with several positive electrode materials of the same type, and charged to a fully charged state after cycle activation ; b) Disassemble the half-battery and perform DSC test with the positive electrode scraping powder and the electrolyte to obtain the peak temperature T 0 and the slope K between the starting point and the exothermic peak apex; c); using the same electrode process to make the above-mentioned several positive electrode materials into a soft-pack full battery, and test the high-temperature storage swelling rate SR; d) according to the SR, T 0 And K value, obtain the coefficient in the formula of this patent invention. e) The T of the obtained material was tested under exactly the same conditions as the half-cell and DSC tests above. 0 And K value, its high temperature storage swelling rate SR can be obtained through the formula. The method of the invention can simply and quickly evaluate the thermal storage stability of the positive electrode material of the lithium battery.

Description

technical field [0001] The invention belongs to the field of lithium ion battery safety, in particular to the field of heat storage stability and safety of positive electrode materials of lithium ion batteries. Background technique [0002] In order to alleviate the energy and environmental crisis, various countries in the world pay more and more attention to energy conversion, storage and utilization technology. As an efficient energy conversion storage device, lithium-ion batteries have been widely used in various fields such as mobile digital, communication and transportation. However, with the continuous popularization of lithium-ion battery applications, there are more and more reports about its safety accidents, such as the fire of IBM notebook lithium-ion batteries, the explosion of Samsung Galaxy Note7 mobile phones, and the spontaneous combustion of Tesla and other new energy vehicles. Safety issues of lithium-ion batteries. Therefore, the research on the evaluati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/16
CPCG01N25/16
Inventor 于振兴刘亚飞陈彦彬张学全姜华伟
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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