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Method for monitoring and analyzing rebound of positive pole piece of lithium ion battery and lithium ion battery

A technology of lithium ion battery and positive pole piece, which is used in the analysis of the rebound of the positive pole piece of lithium ion battery, the characterization of lithium ion battery material test, and the monitoring field, which can solve the problem of lack of strong support, high cost, and change in thickness of the positive pole piece. Lack of in-depth and clear understanding and other issues to achieve the effect of saving R&D costs and speeding up the R&D cycle

Inactive Publication Date: 2019-10-18
蜂巢能源(武汉)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the industry mainly monitors the change of the rebound rate by testing the thickness of the positive pole piece to obtain the change trend of the pole piece thickness, but there is a lack of in-depth and clear understanding of the change in the thickness of the positive pole piece. The use of materials lacks strong support. In this case, the research and development of optimized battery products has a long cycle and high cost

Method used

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  • Method for monitoring and analyzing rebound of positive pole piece of lithium ion battery and lithium ion battery
  • Method for monitoring and analyzing rebound of positive pole piece of lithium ion battery and lithium ion battery
  • Method for monitoring and analyzing rebound of positive pole piece of lithium ion battery and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0101] Prepare the lithium ion battery of the present invention as follows, wherein:

[0102] Positive electrode: the positive electrode foil is metal aluminum foil with a specification of 0.012×666mm; the positive electrode coating material is: nickel cobalt lithium manganate ternary single crystal positive electrode material A, carbon nanotubes (CNTs), conductive agent SP and polyvinylidene fluoride ( PVDF) is prepared according to the weight ratio of 96.2:1.2:1.6:1.0, and the compacted density is 3.45g / cm 3 . Wherein, the positive electrode coating material is double-coated on the positive electrode foil material aluminum foil.

[0103] The diaphragm material is: a polyethylene diaphragm with a specification of 12 μm × 88 mm.

[0104] Electrolyte: LiPF 6 The concentration is 1.1mol / L, the solvent is diethyl carbonate (DEC), ethylene carbonate (EC), ethyl methyl carbonate (EMC), containing vinylene carbonate (VC), ethylene sulfate (DTD), etc. Other types of additive elec...

Embodiment 2

[0112] In addition to making the compacted density of nickel-cobalt lithium manganate ternary single-crystal positive electrode material A from 3.45g / cm 3 down to 2.85g / cm 3 Except, the above test was carried out under the same conditions as in Example 1. The change curve of the corresponding rebound rate of the positive pole piece with the charge and discharge cycle is as follows: Figure 6 shown.

[0113] The physical rebound, chemical rebound and overall rebound of the positive pole piece all increase with the increase of the number of cycles. At the same time, the physical rebound and chemical rebound of the positive electrode are distinguished. Compared with the results in Example 1, there is basically no change in the chemical rebound, while the physical rebound and the overall rebound have a certain decline. This is because the compaction density becomes smaller, and there are more voids in the pole piece, which can accommodate more physical rebound. At the same tim...

Embodiment 3

[0115] The above test was carried out under the same conditions as in Example 1, except that nickel-cobalt lithium manganese oxide ternary polycrystalline positive electrode material B was used instead of nickel-cobalt lithium manganese oxide ternary single-crystal positive electrode material A. Among them, nickel-cobalt lithium manganese oxide ternary polycrystalline positive electrode material B is a secondary particle obtained by compound granulation of primary particles (primary particle diameter D50 value is 280nm), the overall shape of the secondary particles is spherical, material B The particle size D50 value is 9.65 μm, and the surface of the material is not coated. The change curve of the corresponding rebound rate of the positive pole piece with the charge and discharge cycle is as follows: Figure 7 shown.

[0116] The physical rebound, chemical rebound and overall rebound of the positive pole piece all increase with the increase of the number of cycles. At the s...

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Abstract

The application relates to a method for monitoring and analyzing the rebound of a positive pole piece of a lithium ion battery and a lithium ion battery. The lithium ion battery includes a positive pole piece, a negative pole piece and a diaphragm. The positive pole piece includes positive material coatings arranged at two sides of a positive foil. The negative pole piece includes negative material coatings arranged at two sides of a negative foil. The diaphragm is arranged at the positive pole piece and the negative pole piece. Besides, the lithium ion battery further includes barriers arranged at intervals to form a first region having the barriers and a second region without the barriers; the barriers encircle and coat the positive pole piece at intervals in a direction perpendicular tothe long axis in a long axis direction of the positive pole piece, are arranged between the positive pole piece and the diaphragm indirectly, or are arranged between the negative pole piece and the diaphragm indirectly. The application also relates to a method for optimizing the positive material based on the method for monitoring and analyzing the rebound of a positive pole piece of a lithium ion battery and the lithium ion battery.

Description

technical field [0001] The present application relates to the characterization of lithium-ion battery material testing, in particular to a method for monitoring and analyzing the rebound of the lithium-ion battery positive pole piece and the lithium-ion battery. Background technique [0002] The cathode materials for lithium-ion batteries mainly include metal oxides, polyanion salts, fluorides, and sulfides. The current commercialization mainly includes LiCoO 2 , LiMn 2 o 4 、LiFePO 4 、LiNi x co y mn 1-x-y o 2 and LiNi x co y al 1-x-y o 2 According to the crystal structure, the positive electrode material has a layered structure, a spinel structure and an olivine structure, etc.; when rolling, energy transfer occurs between the equipment and the pole piece, and energy loss occurs. At the same time, the rolled pole piece stores elasticity. Potential energy, elastic potential energy is gradually released in the rebound stage after rolling; at the same time, a series ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/382G01B21/08H01M10/42
CPCG01B21/08G01R31/382H01M10/4285Y02E60/10
Inventor 余大强谢智李明黄亮袁园吴军
Owner 蜂巢能源(武汉)有限公司
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