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Lithium iron phosphate battery and preparation method thereof

A technology of lithium iron phosphate battery and lithium iron phosphate, which is applied in secondary battery manufacturing, electrolyte storage battery manufacturing, secondary battery, etc., can solve the problems of poor wettability between high-density electrode sheets and electrolyte, and achieve normal temperature and high temperature Improve cycle performance, prolong service life, solve the effect of poor wettability

Active Publication Date: 2020-08-25
叶小剑 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of the problems existing in the background technology, the object of the present invention is to provide a lithium iron phosphate battery, which can solve the problem of poor wettability between the high-density electrode sheet and the electrolyte, and make the low-temperature performance of the lithium iron phosphate battery stable at room temperature and high temperature. The cycle performance has been improved, effectively prolonging the service life of lithium iron phosphate batteries

Method used

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  • Lithium iron phosphate battery and preparation method thereof

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Effect test

Embodiment 1

[0020] In this example lithium iron phosphate battery, the positive electrode material includes the following components: 2 parts of lithium iron phosphate, 5 parts of conductive agent, 1 part of binder, and 2.5 parts of carbon nanotube slurry; the negative electrode material contains the following parts by weight Components: 1 part of graphite carbon black, 5 parts of conductive agent, 1 part of adhesive, 0.8 part of fullerene, 5 parts of nanowire, 2 parts of nano titanium, the mass fraction of catechol diacetate 5%.

[0021] The preparation method of the lithium iron phosphate battery of this embodiment comprises the following steps:

[0022] (1) Ingredients: mix lithium iron phosphate, conductive agent, binder, and carbon nanotube slurry to obtain mixed positive electrode slurry; mix graphite carbon black, conductive agent, binder, fullerene, nanowire, nano Titanium is mixed to obtain a mixed negative electrode slurry;

[0023] (2) coating: the above-mentioned positive el...

Embodiment 2

[0032] In this example lithium iron phosphate battery, the positive electrode material comprises the following components: 10 parts of lithium iron phosphate, 30 parts of conductive agent, 15 parts of binder, and 30 parts of carbon nanotube slurry; the negative electrode material comprises the following parts by weight Components: 20 parts of graphite carbon black, 30 parts of conductive agent, 15 parts of binder, 25 parts of fullerene, 15 parts of nanowire, 8 parts of nano titanium, the mass fraction of catechol diacetate 12%.

[0033] The preparation method of the lithium iron phosphate battery of this embodiment adopts the same preparation method as that of Example 1.

[0034] The method for extracting fullerenes in this embodiment adopts the same extraction method as in Example 1.

[0035] The preparation method of electrolyte in the present embodiment is:

[0036] The organic solvent ethyl methyl carbonate, dimethyl carbonate, and methyl propionate were mixed, and final...

Embodiment 3

[0039] In this example lithium iron phosphate battery, the positive electrode material comprises the following components: 7 parts of lithium iron phosphate, 15 parts of conductive agent, 7 parts of binder, and 15 parts of carbon nanotube slurry; the negative electrode material comprises the following parts by weight Components: 10 parts of graphite carbon black, 15 parts of conductive agent, 8 parts of binder, 12 parts of fullerene, 10 parts of nanowire, 5 parts of nano titanium, the mass fraction of catechol diacetate 10%.

[0040] The preparation method of the lithium iron phosphate battery of this embodiment adopts the same preparation method as that of Example 1.

[0041] The extraction method of fullerene in this embodiment adopts the same extraction method as that of Example 1.

[0042] The preparation method of the negative electrode material in this example adopts the same preparation method as that of Example 1.

[0043] The preparation method of electrolyte in the...

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Abstract

The invention provides a lithium iron phosphate battery. A positive electrode material of the lithium iron phosphate battery comprises the following components: lithium iron phosphate, a conductive agent, an adhesive and carbon nanotube slurry or graphene; the negative electrode material comprises the following components: graphite carbon black, a conductive agent, an adhesive, fullerene, a nanowire and nano titanium; and an electrolyte comprises catechol diacetate. The nanowire and the nano titanium are added into the negative electrode material of the battery, the catechol diacetate is addedinto the electrolyte, so that the lithium iron phosphate battery disclosed by the invention can solve the problem of poor wettability between a high-compaction-density electrode plate and the electrolyte, the low-temperature performance, the normal-temperature cycle performance and the high-temperature cycle performance of the lithium iron phosphate battery are improved, and the service life of the lithium iron phosphate battery is effectively prolonged.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a lithium iron phosphate battery and a preparation method thereof. Background technique [0002] Lithium-ion secondary batteries are widely used in electric vehicles and consumer electronics products due to their advantages such as high energy density, high output power, long cycle life and low environmental pollution. Lithium iron phosphate is one of the most commonly used positive electrode materials for power batteries due to its high cycle life, good safety and low price. The disadvantage of lithium iron phosphate batteries is their low energy density. In order to increase the energy density, on the one hand, it is to increase the gram capacity of the positive and negative electrode materials, and on the other hand, it is to increase the compaction density of the positive and negative electrode diaphragms. However, the increase in compaction density will lead to difficulties in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/62H01M10/0567H01M10/058
CPCH01M10/0525H01M4/62H01M10/0567H01M10/058H01M10/04H01M4/583H01M4/136H01M4/5825H01M4/625H01M4/133H01M4/1397H01M4/1393H01M4/623H01M10/0569C01B32/154H01M2300/004
Inventor 叶小剑平松雄二牛尾顺一
Owner 叶小剑
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