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Surface film coating modify method for improving lithium ionic cell positive pole safety

A lithium-ion battery and surface coating technology, which is applied in ion implantation plating, electrode manufacturing, sputtering plating, etc., can solve the problems of safety, high battery specific energy, etc., and achieve less damage, dense coating layer, and simple equipment Effect

Inactive Publication Date: 2009-08-12
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The specific energy of the battery is high, and the electrolyte is mostly organic combustibles, etc. When the heat generation rate of the battery is faster than the heat dissipation rate, safety problems may occur

Method used

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  • Surface film coating modify method for improving lithium ionic cell positive pole safety
  • Surface film coating modify method for improving lithium ionic cell positive pole safety
  • Surface film coating modify method for improving lithium ionic cell positive pole safety

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Select 0.2g of lithium cobalt oxide as the active material of the positive electrode material, add 0.0235g of conductive agent acetylene black into the mortar, add 0.0117g of binder polyvinylidene fluoride (PVDF) and N-methyl-2-pyridinone As the solvent of the binder, the three are mixed into a slurry at normal temperature and pressure, and evenly coated on the aluminum foil substrate as a current collector. The thickness of the obtained film is about 40 μm. After vacuum drying at 55 ° C for 12 hours, Compress under 0.2MPa, and then cut the baked pole piece into 20×20mm for later use. Put the cut pole piece into the sample chamber of the magnetron sputtering equipment. SiO 2 The target material is placed in the sputtering chamber of the magnetron sputtering equipment. Adjust the air pressure of the magnetron sputtering equipment to 0.5Pa, and adjust the power to 40W. Set the sputtering time to 5min and start running the equipment to coat the sample. See figure 1 , ...

Embodiment 2

[0027] Put the 20×20mm spare positive pole piece coated in Example 1 into the sample chamber of the magnetron sputtering equipment. Put the CaO target as the target material into the sputtering chamber of the magnetron sputtering equipment. Adjust the air pressure of the magnetron sputtering equipment to 0.5Pa, and adjust the power to 40W. Set the sputtering time to 5min and start running the equipment to coat the sample.

Embodiment 3

[0029] Put the 20×20mm spare positive pole piece coated in Example 1 into the sample chamber of the magnetron sputtering equipment. Will Al 2 o 3 The target is placed in the sputtering chamber of the magnetron sputtering equipment. Adjust the air pressure of the magnetron sputtering equipment to 0.5Pa, and adjust the power to 40W. Set the sputtering time to 10min and start running the equipment to coat the sample.

[0030] Analyzing the accompanying drawings, it can be known that the lithium-ion battery electrode pole piece after magnetron sputtering coating can be seen to form a coating layer on the surface. The positive electrode prepared by this method forms a protective film on the surface of the original electrode, and the film is stable and uniformly covers the electrode surface. It can also be seen from the accompanying drawings that the cycle performance, specific capacity, service life and thermal stability of the electrode piece after coating have all been improv...

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Abstract

The present invention relates to a technology of filming on the anode surface of a lithium-ion battery by the magnetic control sputtering method. The positive plate of the common lithium-ion battery is gained through film preparation and is cut into the needed size and put to a sample chamber of a magnetic control sputtering device; a proper target material is put to a sputtering chamber of the magnetic control sputtering device; the sputtering power is set between 40 W and 60 W and the sputtering time is set between 2 min and 30 min and then the positive plate is gained through filming. The positive plate has better cycle performance, charge-discharge capacity and thermal stability, and improves the safety performance of the lithium-ion battery under the conditions of overcharge, overdischarge and misuse.

Description

technical field [0001] The invention relates to the technology of positive electrode materials of lithium ion batteries, in particular to a coating method for positive electrode materials of lithium ion batteries. Background technique [0002] With the continuous development of electronic technology, the rapid development of high-performance and environment-friendly secondary batteries has been promoted. Lithium-ion batteries use different lithium intercalation compounds as positive and negative secondary batteries. Generally, lithium cobaltate, lithium nickelate, lithium manganate and their modified compounds are used as positive electrodes, and lithium-intercalated carbon compounds are used as negative electrodes to dissolve lithium. The organic solution of lithium salt is used as the electrolyte to form the battery. During the charging and discharging process, Li + The reciprocating intercalation and deintercalation between the two poles realizes the charge and discharg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04C23C14/35C23C14/06
CPCY02E60/10
Inventor 吴锋任旭梅钭一伟
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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