Lithium iron phosphate battery, electrolyte and manufacturing method of lithium iron phosphate battery

A lithium iron phosphate battery and electrolyte technology, which is applied in the field of lithium iron phosphate battery, electrolyte and lithium iron phosphate battery preparation, can solve the problems of chemical block battery short circuit, accelerated battery attenuation, explosion, etc., to reduce internal impedance , prolong service life and high discharge efficiency

Inactive Publication Date: 2019-12-10
营口路航新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to low temperature conditions, the electrolyte inside the traditional lithium iron phosphate battery is easy to freeze inside, which will cause the battery to fail to discharge normally at minus 10-20°C, and generally only achieve a discharge efficiency of 60-70%. Accelerate the attenuation of the battery, and the chemical crystals grown inside it can easily cause problems such as instantaneous short circuit, explosion, and fire when the battery is charging and discharging.

Method used

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  • Lithium iron phosphate battery, electrolyte and manufacturing method of lithium iron phosphate battery
  • Lithium iron phosphate battery, electrolyte and manufacturing method of lithium iron phosphate battery
  • Lithium iron phosphate battery, electrolyte and manufacturing method of lithium iron phosphate battery

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Effect test

Embodiment 1

[0029] This embodiment provides an electrolyte, a lithium iron phosphate battery containing the electrolyte, and a method for preparing the lithium iron phosphate battery. Specifically, the preparation method for the lithium iron phosphate battery includes the following steps:

[0030] (1) According to the mass fraction, weigh the following components: ethylene carbonate 35.4%, ethyl methyl carbonate 35%, dimethyl carbonate 15%, propylene carbonate 3%, lithium hexafluorophosphate 10%, propane sultone 0.5% %, vinylene carbonate 1%, and lithium difluorooxalate borate 0.1%; these weighed components are mixed evenly to obtain an electrolyte solution for future use.

[0031] (2) First weigh 60kg of lithium iron phosphate, 0.5kg of polyvinylidene fluoride, 0.5kg of conductive agent, and 60kg of N-methylpyrrolidone for later use; The above-mentioned polyvinylidene fluoride needs to be baked at a temperature of 105°C for 3 hours before weighing, and the above-mentioned conductive agen...

Embodiment 2

[0038] This embodiment provides an electrolyte, a lithium iron phosphate battery containing the electrolyte, and a method for preparing the lithium iron phosphate battery. Specifically, the preparation method for the lithium iron phosphate battery includes the following steps:

[0039] (1) According to the mass fraction, weigh the following components: ethylene carbonate 24%, ethyl methyl carbonate 20%, dimethyl carbonate 25%, propylene carbonate 7%, lithium hexafluorophosphate 18%, propane sultone 2 %, 3% vinylene carbonate, and 1% lithium difluorooxalate borate; mix these weighed components evenly to obtain an electrolyte solution for later use.

[0040] (2) First weigh 40kg of lithium iron phosphate, 4kg of polyvinylidene fluoride, 4kg of conductive agent, and 40kg of N-methylpyrrolidone for later use; Baking at 105°C for 3 hours before weighing the above-mentioned polyvinylidene fluoride, and baking at 120°C for 4 hours before weighing the above-mentioned conductive agent,...

Embodiment 3

[0047] This embodiment provides an electrolyte, a lithium iron phosphate battery containing the electrolyte, and a method for preparing the lithium iron phosphate battery. Specifically, the preparation method for the lithium iron phosphate battery includes the following steps:

[0048] (1) According to the mass fraction, weigh the following components: ethylene carbonate 33.4%, ethyl methyl carbonate 30%, dimethyl carbonate 18%, propylene carbonate 4%, lithium hexafluorophosphate 12%, propane sultone 0.8 %, vinylene carbonate 1.5%, and lithium difluorooxalate borate 0.3%; these weighed components are mixed evenly to obtain an electrolyte solution for future use.

[0049] (2) First weigh 55kg of lithium iron phosphate, 1kg of polyvinylidene fluoride, 1kg of conductive agent, and 50kg of N-methylpyrrolidone for later use; Baking at 105°C for 3 hours before weighing the above-mentioned polyvinylidene fluoride, and baking at 120°C for 4 hours before weighing the above-mentioned co...

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Abstract

The invention discloses a lithium iron phosphate battery, an electrolyte and a manufacturing method of the lithium iron phosphate battery and belongs to the lithium battery technology field. In the invention, a low-temperature electrolyte containing ethyene catrbonate, ethyl methyl carbonate, dimethyl carbonate, propylene carbonate, lithium hexafluorophosphate, propane sultone, vinylene carbonateand lithium difluoroborate is used as the electrolyte of the lithium iron phosphate battery. An anode plate and a cathode plate of the lithium iron phosphate battery are improved so that an internal impedance of the lithium iron phosphate battery is reduced. The lithium iron phosphate battery can normally discharge in an environment of minus 40 + / -3 DEG C, and discharge efficiency in a low-temperature environment is relatively high so that a service life of the lithium iron phosphate battery can be prolonged, and an energy-saving effect can be achieved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium iron phosphate battery, an electrolyte and a preparation method for the lithium iron phosphate battery. Background technique [0002] Lithium iron phosphate battery is a lithium ion battery that uses lithium iron phosphate as the positive electrode material. [0003] At present, traditional lithium iron phosphate batteries can generally only be used at room temperature. Due to low temperature conditions, the electrolyte inside the traditional lithium iron phosphate battery is easy to freeze inside, which will cause the battery to fail to discharge normally at minus 10-20°C, and generally only achieve a discharge efficiency of 60-70%. This will lead to faster attenuation of the battery, and the chemical crystals grown inside it can easily cause problems such as instantaneous short circuit, explosion, and fire when the battery is charging and discharging. Con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568H01M10/0525H01M10/42
CPCH01M10/0568H01M10/0525H01M10/4235H01M2300/0025Y02E60/10
Inventor 鞠以彬郭建董宏亮
Owner 营口路航新能源科技有限公司
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