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Rapid and convenient evaluation method for heat storage stability of lithium ion battery positive electrode material

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

Active Publication Date: 2019-03-12
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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  • Rapid and convenient evaluation method for heat storage stability of lithium ion battery positive electrode material
  • Rapid and convenient evaluation method for heat storage stability of lithium ion battery positive electrode material
  • Rapid and convenient evaluation method for heat storage stability of lithium ion battery positive electrode material

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 invention provides a method for rapidly and conveniently evaluating high-temperature storage stability of a lithium ion battery positive electrode material combined with a differential scanning calorimetry. The method comprises the following steps: a) preparing a button-type half-battery by several positive electrode materials in a same type, after circularly activating, charging to be a fullenergy state; b) disassembling the half-battery and performing a DSC test on positive plate scraping powder and electrolyte together, to obtain a starting peak temperature T0 and a slope K between a starting peak point and a heat release peak vertex; c) preparing a soft package full battery through the above several positive electrode materials by using a same electrode technology, and testing a high-temperature storage ballooning rate SR; d) according to SR, T0 and K values of the above materials, solving coefficients in a formula of the method; and e) in conditions which are completely the same as the above half-battery and DSC test, testing to obtain the T0 and K values of the material, through the formula, to obtain the high-temperature storage ballooning rate SR thereof. The method iscapable of simply, rapidly and conveniently evaluating the heat storage stability of the lithium ion battery positive electrode material.

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 Applications(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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