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Nanometer lithium iron phosphate power cell with super-high rate and super long cycle life and manufacturing method

A lithium iron phosphate, cycle life technology, applied in electrolyte battery manufacturing, secondary battery, final product manufacturing, etc. The material is baked out and the bonding fastness does not meet the technological requirements, so as to reduce the heat generation, improve the bonding fastness and reduce the internal resistance.

Active Publication Date: 2012-01-11
JIANGSU LENENG BATTERY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Current problems: Because power batteries have higher and higher requirements on performance such as rate, the original particle size of the positive electrode material used in the production of the battery is getting smaller and smaller, and even nanometerized, and the nanometerized lithium iron phosphate positive electrode material has great Strong water absorption, once the water is absorbed and polluted by water, the crystal water and bound water of the positive electrode material in the battery cannot be baked out with the traditional temperature and vacuum degree of the baking material. During the later use of the battery, the bonding fastness between the nano-sized powder and the ordinary aluminum foil cannot meet the process requirements, and it is difficult to make the nano-sized lithium iron phosphate powder using the traditional mixing method and battery manufacturing process. The materials are evenly dispersed, resulting in battery rate performance, cycle performance, low temperature performance, and cell consistency, which cannot meet the requirements of batteries for electric vehicles.

Method used

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  • Nanometer lithium iron phosphate power cell with super-high rate and super long cycle life and manufacturing method
  • Nanometer lithium iron phosphate power cell with super-high rate and super long cycle life and manufacturing method
  • Nanometer lithium iron phosphate power cell with super-high rate and super long cycle life and manufacturing method

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Embodiment 1

[0040] An ultra-high rate, ultra-long cycle life nano-lithium iron phosphate power battery and a manufacturing method thereof, in weight percentage, comprising the following process steps:

[0041] 1. Control the ambient humidity: firstly, ensure the ambient humidity during the production of lithium iron phosphate cathode powder. 200ppm, while ensuring the humidity of the battery manufacturing environment to ensure that the battery pole pieces are not polluted by secondary water.

[0042]2. Configure LFP premix: Take 2.0kg of N-methylpyrrolidone solvent (hereinafter referred to as NMP solvent), add it to a special double-shaft mixer, add 3kg of lithium iron phosphate, and stir at a low speed of 30rpm, a high speed of 800rpm, and stir for 60 minutes at the same time , add NMP0.66kg, low speed 30rpm, high speed 2000rpm, and stir for 30min at the same time. The LFP premix solution is configured as a lithium iron phosphate solid powder and NMP solvent, so that the lithium iron ph...

Embodiment 2

[0061] The preparation method of the present invention comprises the following process steps:

[0062] 1. First of all, ensure the ambient humidity when producing lithium iron phosphate positive electrode powder. The ambient humidity dew point temperature is controlled below -45°C, so that the moisture content of lithium iron phosphate positive electrode powder does not exceed 200ppm under the moisture test at 400°C. At the same time, ensure that The humidity of the battery manufacturing environment ensures that the battery pole pieces are not polluted by secondary water.

[0063] 2. Configure the LFP premix: Take 2.0kg of N-methylpyrrolidone solvent (NMP solvent for short), add it to a special double-shaft mixer, add 3kg of lithium iron phosphate, and stir at a low speed of 30rpm and a high speed of 800rpm. After stirring for 60min at the same time, Add NMP0.455kg, low speed 30rpm, high speed 2000rpm, and stir for 30min at the same time. The LFP premix solution is configured...

Embodiment 3

[0082] The preparation method of the present invention comprises the following process steps:

[0083]1. First of all, ensure the ambient humidity when producing lithium iron phosphate positive electrode powder. The ambient humidity dew point temperature is controlled below -45°C, so that the moisture content of lithium iron phosphate positive electrode powder does not exceed 200ppm under the moisture test at 400°C. At the same time, ensure that The humidity of the battery manufacturing environment ensures that the battery pole pieces are not polluted by secondary water.

[0084] 2. Configure the LFP premix: Take 2.3kg of N-methylpyrrolidone solvent (NMP solvent for short), add it to a special double-shaft mixer, add 3kg of lithium iron phosphate, and stir at a low speed of 30rpm and a high speed of 800rpm. After stirring for 60min at the same time, Add NMP0.58kg, low speed 30rpm, high speed 2000rpm, and stir for 30min at the same time. The LFP premix is ​​configured as an LF...

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Abstract

A nanometer lithium iron phosphate power cell with super-high rate and super long cycle life and a manufacturing method thereof. Based on weight percentage, the manufacturing method comprises the following steps of: 1) controlling environmental humidity; 2) preparing a LFP premixing liquid; 3) carrying out sand milling; 4) carrying out high magnetic filtering; 5) filtering by a filter; 6) preparing a glue solution; 7) preparing a slurry; 8) coating carbon aluminium foil and pole shoe coating; 9) processing the pole shoe by a hot roller; 10) baking in vacuum; 11) examining. The processed and manufactured nanometer lithium iron phosphate cell provided by the invention has much more excellent internal resistance, cycle performance, high rate discharge performance and low temperature performance than cells manufactured by common technologies; the self-discharge rate of the cell provided by the invention is much lower than that of the cells manufactured by common technologies; the cycle life of the cell provided by the invention at high rate is increased from 2000 times to over 8000 times; and the properties of the cell provided by the invention can all meet requirements of cells for electric vehicles and racing cars.

Description

technical field [0001] The invention relates to the technical field of manufacturing lithium-ion secondary batteries, in particular to a nano-lithium iron phosphate power battery with ultra-high rate and ultra-long cycle life and a manufacturing method thereof. Background technique [0002] Lithium iron phosphate power battery is a new generation of lithium-ion secondary battery. The main elements iron and phosphorus in lithium iron phosphate are not only abundant in nature, but also relatively cheap, environmentally friendly, and superior in performance. For pure electric vehicles , The large-scale popularization of hybrid electric vehicles is of great significance; lithium iron phosphate power battery has a stable olivine structure, so it is very safe; through the nanometerization of lithium iron phosphate cathode material and doping with metal elements, the lithium iron phosphate power battery has Very good high-rate performance; through the improvement of the purity of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0525
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 丁建民
Owner JIANGSU LENENG BATTERY INC
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