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Composite positive electrode material, battery and battery pack

A composite cathode material and battery technology, applied in the field of electrochemical energy storage, can solve problems such as battery side reactions and battery self-discharge, and achieve the effects of reduced self-discharge, good stability, and improved battery float performance and cycle performance.

Inactive Publication Date: 2017-09-12
POSITEC POWER TOOLS (SUZHOU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, one of the problems still to be solved for this type of battery is the self-discharge of the battery due to side reactions between the positive electrode and the aqueous electrolyte

Method used

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  • Composite positive electrode material, battery and battery pack

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preparation example Construction

[0033] In the specific embodiment of the present invention, a method for preparing a composite positive electrode material is also provided. Specifically, the preparation method includes the following steps:

[0034] Weighing the positive electrode active material lithium ion intercalation compound and the lead source according to a predetermined weight ratio.

[0035] Mix the weighed lithium ion intercalation compound and the lead source, and stir evenly, so that the lead source of the coating material is evenly coated on the lithium ion intercalation compound. Blending includes dry blending and wet blending. Solvents used for wet mixing include but are not limited to alcohol.

[0036] The mixed product is sintered. Of course, the mixed product can be dried before sintering. Specifically, the sintering condition is heating to 400-650° C. at a heating rate of 1-10° C. / min and holding the temperature for 15-30 hours. Finally, the temperature was naturally lowered to room te...

Embodiment 1

[0114] In the composite positive electrode material of this embodiment, the positive electrode active material is lithium manganese oxide LiMn 2 o 4 , the coating layer is lead, and the composite positive electrode material is lead-coated lithium manganate, wherein the mass percentage of lead and lithium manganate is 5%.

[0115] The lithium manganate modified material of the present embodiment is prepared by the following method:

[0116] Raw materials: weigh lead acetate and lithium manganate according to the mass ratio of 5:100, mix them in deionized water, and stir. The coating material is evenly coated on the surface of the positive electrode active material lithium manganate particles, the uniformly mixed product is dried, and the dried solid material is sintered at 400-650° C. for 15-30 hours.

Embodiment 2

[0118] In the composite positive electrode material of this embodiment, the positive electrode active material is lithium manganese oxide LiMn 2 o 4 , the coating layer is lead, and the composite positive electrode material is lead-coated lithium manganate, wherein the mass percentage of lead and lithium manganate is 1%.

[0119] The lithium manganate modified material of the present embodiment is prepared by the following method:

[0120] Raw materials: weigh lead acetate and lithium manganate according to the mass ratio of 1:100, mix them in deionized water, and stir. The coating material is evenly coated on the surface of the positive electrode active material lithium manganate particles, the uniformly mixed product is dried, and the dried solid material is sintered at 400-650° C. for 15-30 hours.

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Abstract

The invention provides a composite positive electrode material. The composite positive electrode material comprises a positive electrode active substance and a coating layer, the positive electrode active substance comprises a lithium ion de-intercalation compound, and the coating layer is at least one of metallic lead, lead monoxide and lead tetraoxide. The invention also provides a battery. The positive electrode of the battery adopts the composite positive electrode material. The composite positive electrode material effectively improves the side reaction problems of the battery, reduces self-discharge of the battery, prolongs the service life of the battery, and improves the electrochemical performances and the safety performance of the battery.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage, and in particular relates to a composite positive electrode material. [0002] The invention also relates to a battery. [0003] The invention also relates to a battery pack comprising several cells. Background technique [0004] Lead-acid batteries, which have been around for more than a hundred years, have mature battery technology and occupy an absolute market share in energy storage fields such as car starter batteries, electric bicycles, and UPS. Although the lead-acid battery has a low cycle life and a relatively low energy density, it has the advantages of very low price and high cost performance. Therefore, in recent years, nickel-metal hydride batteries, lithium-ion batteries, sodium-sulfur batteries, and flow batteries cannot replace lead-acid batteries in the field of energy storage. [0005] In recent years, a new type of aqueous secondary battery has emerged. The pos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/0525
CPCH01M4/362H01M4/62H01M10/0525Y02E60/10
Inventor 罗小松陈璞
Owner POSITEC POWER TOOLS (SUZHOU) CO LTD