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Lithium iron phosphate power battery and manufacturing method thereof

A lithium iron phosphate, power battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of normal temperature discharge, low specific energy, and high environmental temperature requirements, and achieve good internal stability.

Inactive Publication Date: 2014-10-15
SHENZHEN PUYI BATTERY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes a lithium iron phosphate power battery and a manufacturing method thereof, aiming at overcoming the problems of low specific energy of the pure lithium-ion power battery of the lithium-ion battery, high requirements on the operating environment temperature, and discharge at room temperature

Method used

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  • Lithium iron phosphate power battery and manufacturing method thereof

Examples

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Effect test

Embodiment 1

[0044] A lithium iron phosphate power battery, including a positive electrode, a negative electrode, a 25um diaphragm, a polymer gel electrolyte, and a battery case, including:

[0045] The positive electrode is composed of positive active material, binder, conductive agent and positive current collector.

[0046] The ratio is: 90wt% lithium iron phosphate is used as the positive electrode active material, 2.5wt% polyvinylidene fluoride is used as the binder; 1wt% conductive carbon black is used as the conductive agent; 16um aluminum foil is used as the positive electrode current collector;

[0047] The negative electrode is composed of negative electrode material, conductive agent, thickener, binder and negative electrode collector.

[0048] The ratio is: the negative electrode material uses 91wt% graphene; the conductive agent uses 0.2wt% conductive carbon black; the thickener uses 0.5wt% sodium carboxymethyl cellulose; the binder uses 2wt% styrene-butadiene rubber; The neg...

Embodiment 2 to 5

[0064] Most of the manufacturing process is the same as in Example 1, the difference is that the content of lithium manganate, lithium nickel cobalt manganese oxide, the selection and content of positive electrode conductive agent, the selection and content of graphite and the selection and content of negative electrode conductive agent The characteristics of the obtained lithium iron phosphate power battery are shown in Table 1 below.

[0065] Table I

[0066]

[0067] The positive electrode material is mainly lithium iron phosphate, and one or more substances such as conductive graphite, flake graphite, and carbon nanotubes are added, and the negative electrode active material is one or more of artificial graphite, natural graphite, mesocarbon microspheres, or hard carbon materials. Various, the conductive agent adopts one or more of conductive carbon black and carbon nanotubes; to improve the specific energy and structural stability of the soft-packed winding lithium iro...

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Abstract

The invention provides a lithium iron phosphate power battery, which comprises a plurality of anodes, a plurality of cathodes, a plurality of diaphragms, a polymer gel electrolyte and a battery shell. The anode comprises an anode active material, a conductive agent, a binder and an anode current collector, and the anode active material contains (percentage by weight) 90-95% of lithium iron phosphate; the cathode comprises a cathode active material, a conductive agent, a thickener, a binder and a cathode current collector, and the cathode active material includes (percentage by weight) 91-93% of graphene; and the anodes, cathodes and the diaphragms between the anodes and cathodes are reeled layer by layer into a heliciform shape to form an electrical core. The invention also discloses a manufacturing method of the lithium iron phosphate power battery. The lithium iron phosphate power battery provided by the invention and the manufacturing method thereof mainly use lithium iron phosphate, which is supplemented with conductive graphite and flake graphite, and flexible package coiling is employed to improve the specific energy and structure stability of the power battery.

Description

technical field [0001] The power battery and the manufacturing method thereof of the present invention particularly relate to a lithium iron phosphate power battery and the manufacturing method thereof. Background technique [0002] At present, with the development of society, the dwindling of traditional oil resources and the climate problem characterized by global warming are becoming more and more serious threats to human beings. [0003] The use of batteries to build energy storage power stations can store the remaining electric energy of power stations to cut peaks and fill valleys, which can greatly solve the problem of energy shortage. In the past, batteries for energy storage power stations used lead-acid batteries. Due to the pollution and use of lead-acid batteries themselves Problems such as short life and high environmental temperature requirements are gradually replaced by lithium iron phosphate batteries. At present, the specific energy of lithium iron phosphat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/62
CPCY02E60/122H01M4/625H01M10/0525H01M10/0587Y02E60/10
Inventor 万文安程建聪
Owner SHENZHEN PUYI BATTERY TECH
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