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Method for rapidly predicting cycle performance of lithium battery ternary material

A ternary material, cycle performance technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problem of high cost, achieve good commercial value, reduce the difficulty of testing, and simple methods

Inactive Publication Date: 2018-07-24
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

R&D speed can be increased by increasing the number of R&D personnel and R&D equipment, but the cost is high

Method used

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  • Method for rapidly predicting cycle performance of lithium battery ternary material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Rapid prediction of LiNi 0.85 co 0.1 mn 0.05 o 2 cycle performance

[0032] First, the lithium battery ternary material LiNi 0.85 co 0.1 mn 0.05 o 2 Prepared into a pole piece, the surface density of the pole piece is 100g / cm 3 , the mass ratio of the ternary material in the pole piece is 80%, and the pole piece, lithium sheet, diaphragm, nickel foam and electrolyte are assembled into a button battery.

[0033] Put the button battery into the test cabinet for testing, first charge and discharge at 0.1C, the charge and discharge voltage range is 2.75-4.3V, the cut-off current of constant current and constant voltage charging is 0.05C, and then charge at 0.2C, 1C, and 2C respectively Discharge, and finally drop back to 0.1C for charge and discharge, divide the discharge capacity of the second 0.1C by the discharge capacity of the first 0.1C, calculate the ratio M, and then judge the cycle performance of the ternary material according to the M value.

Embodiment 2

[0034] Example 2: Rapid prediction of LiNi 0.85 co 0.1 mn 0.05 o 2 cycle performance

[0035] First, the lithium battery ternary material LiNi 0.85 co 0.1 mn 0.05 o 2 Prepared into a pole piece, the surface density of the pole piece is 100g / cm 3 , the mass ratio of the ternary material in the pole piece is 80%, and the pole piece, lithium sheet, diaphragm, nickel foam and electrolyte are assembled into a button battery.

[0036] Put the button battery into the test cabinet for testing, first charge and discharge at 0.1C, the charge and discharge voltage range is 2.75-4.3V, the cut-off current of constant current and constant voltage charging is 0.05C, and then charge and discharge at 0.2C, 1C, 2C, 3C respectively , 4C, 5C for charge and discharge, and finally drop back to 0.1C for charge and discharge, divide the discharge capacity of the second 0.1C by the discharge capacity of the first 0.1C, calculate the ratio M, and then judge the ternary material according to the...

Embodiment 3

[0037] Example 3: Rapid prediction of LiNi 0.333 co 0.333 mn 0.333 o 2 cycle performance

[0038] First, the lithium battery ternary material LiNi 0.333 co 0.333 mn 0.333 o 2 Prepared into pole pieces, the surface density of the pole piece is

[0039] 200g / cm 3 , the mass ratio of the ternary material in the pole piece is 95%, and the pole piece, lithium sheet, diaphragm, nickel foam and electrolyte are assembled into a button battery.

[0040] Put the button battery into the test cabinet for testing, first charge and discharge at 0.1C, the charge and discharge voltage range is 2.75-4.3V, the cut-off current of constant current and constant voltage charging is 0.05C, and then charge at 0.2C, 1C, and 2C respectively Discharge, and finally drop back to 0.1C for charge and discharge, divide the discharge capacity of the second 0.1C by the discharge capacity of the first 0.1C, calculate the ratio M, and then judge the cycle performance of the ternary material according to...

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Abstract

The invention discloses a method for rapidly predicting the cycle performance of a lithium battery ternary material, including the following steps: S1, preparing pole pieces from the lithium battery ternary material, and assembling the pole pieces, a lithium plate, a diaphragm, foam nickel and electrolyte into a button battery; S3, charging and discharging the button battery at 0.1C, and recordingthe discharge capacity as a first discharge capacity; S4, charging and discharging the button battery under at least two rates above 0.1 C respectively; S5, charging and discharging the button battery at 0.1C again, and recording the discharge capacity as a second discharge capacity; and S6, obtaining the ratio of the second discharge capacity to the first discharge capacity as an M value, and judging the cycle performance of the lithium battery ternary material according to the M value. The concept of M value is introduced, the cycle performance of the lithium battery ternary material is quantified through the M value, and a reference is provided for the test of the cycle performance of the lithium battery ternary material. The test of the cycle performance of the ternary material is converted into the test of the M value, which reduces the test difficulty and improves the test efficiency.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for rapidly predicting the cycle performance of lithium battery ternary materials. Background technique [0002] Due to its high working voltage, energy density, long life and environmental friendliness, lithium-ion batteries have become the power source of a new generation of electric vehicles, electric tools and electronic products, and have been widely used in energy, transportation, communications, etc. in different fields. [0003] Ternary materials, especially high-nickel ternary materials, are the current research hotspots, and have been widely used due to their high capacity and excellent cycle performance. The research and development of ternary materials is also a key topic for major material and battery companies. As we all know, the speed of research and development directly determines the market of the product. Therefore, increasing the spee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/392
Inventor 高玉仙陈方李道聪
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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