High-safety high-energy long-cycle lithium iron phosphate type 18650 lithium battery and preparation method thereof

A lithium iron phosphate, high-energy technology, applied in the direction of battery electrodes, secondary batteries, battery components, etc., can solve the problems of limited battery capacity, etc., and achieve the effects of material cost reduction, reasonable particle size composition, and high resistivity

Active Publication Date: 2018-12-25
江西省汇亿新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the capacity of batteries is still limited. With the development of electric vehicles, batteries with higher specific energy are required to meet the requirements of digital and energy storage 18650 ba

Method used

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  • High-safety high-energy long-cycle lithium iron phosphate type 18650 lithium battery and preparation method thereof
  • High-safety high-energy long-cycle lithium iron phosphate type 18650 lithium battery and preparation method thereof
  • High-safety high-energy long-cycle lithium iron phosphate type 18650 lithium battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0053] A high-safety, high-energy, long-cycle lithium iron phosphate 18650 lithium battery, including a positive electrode, a negative electrode, a separator, an electrolyte, and a casing. The positive electrode is a mixture of active material, conductive agent and binder uniformly coated on metal aluminum foil Made from two sides, areal density 280mg / cm 2 The negative electrode is made by uniformly coating the mixture of active material, conductive agent and binder on both sides of the metal copper foil, with an area density of 280mg / cm 2 Among them: the thickness of the metal aluminum foil is 11.5μm, the active material in the positive electrode coating mixture is carbon-doped lithium iron phosphate, the carbon content is 1.05wt%, the particle size D50 is 2.2μm, the D90 is 11μm, and the specific capacity is 155mAh / g , Compaction density 2.05g / cm 3 , The conductive agent is Super P composite CNT, the binder is PVDF; the diaphragm is a ceramic diaphragm, which is a PE base film c...

Embodiment 2

[0055] A high-safety, high-energy, long-cycle lithium iron phosphate 18650 lithium battery, including a positive electrode, a negative electrode, a separator, an electrolyte, and a casing. The positive electrode is a mixture of active material, conductive agent and binder uniformly coated on metal aluminum foil Made from two sides, areal density 340mg / cm 2 The negative electrode is made by uniformly coating the mixture of active material, conductive agent and binder on both sides of the metal copper foil, with an area density of 340mg / cm 2 Among them: the thickness of the metal aluminum foil is 12.8μm, the active material in the positive electrode coating mixture is carbon-doped lithium iron phosphate, the carbon content is 1.25wt%, the particle size D50 is 2.5μm, D90 is 10.5μm, and the specific capacity is 157mAh / g, compaction density 2.4g / cm 3 , The conductive agent is GR composite CNT, the binder is PVDF; the diaphragm is a ceramic diaphragm, which is a PE base film coated wi...

Embodiment 3

[0057] A high-safety, high-energy, long-cycle lithium iron phosphate 18650 lithium battery, including a positive electrode, a negative electrode, a separator, an electrolyte, and a casing. The positive electrode is a mixture of active material, conductive agent and binder uniformly coated on metal aluminum foil Made from two sides, surface density 320mg / cm 2 , The negative electrode is made by uniformly coating the mixture of active material, conductive agent and binder on both sides of the metal copper foil, with an area density of 320mg / cm 2 , Where: the thickness of the metal aluminum foil is 13μm, the active material in the positive electrode coating mixture is carbon-doped lithium iron phosphate, the carbon content is 1.38wt%, the particle size D50 is 3.5μm, the D90 is 9μm, the specific capacity is 165mAh / g, Compacted density 2.25g / cm 3 , The conductive agent is CF composite CNT, the binder is PVDF; the diaphragm is a ceramic diaphragm, which is a PE base film coated with a ...

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Abstract

The invention provides a high-safety high-energy long-cycle lithium iron phosphate type 18650 lithium battery and a preparation method thereof. The cathode active material of the battery is carbon doped coated lithium iron phosphate with a small particle size and uniform particle size distribution, with the specific capacity being not less than 155 mAh/g and the compaction density being 2.0 - 2.8g/cm<3>; the anode active material is graphite with the specific capacity being 350 - 375 mAh/g and the compaction density being not less than 1. 7 g/cm<3>; a membrane is a PE base membrane coated with a nanometer Al2O3 ceramic membrane. The method comprises the steps of homogenizing, coating, rolling, cutting, winding, shelling, liquid injection, cleaning, oiling, forming and mixing. The batteryenergy density of the invention is as high as 390Wh/L, the discharge capacity of the monomer cell 0.2 C is not less than 2000 mAh, the cycle performance is excellent, the capacity retention rate of the cell 0.5 C/0. 5C100% DOD after 1000 cycles is above 80%, the thermal stability is good, and the overcharge performance is good.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to an 18650 cylindrical lithium battery, in particular to a high-safety, high-energy and long-cycle lithium iron phosphate 18650 lithium battery and a preparation method thereof. [0002] Professional terms: CNT refers to carbon nanotubes, PVDF refers to polyvinylidene fluoride, GR refers to graphite, CF refers to carbon fiber, Super P carbon black, SBR refers to styrene butadiene rubber, CMC refers to hydroxymethyl cellulose, PE refers to polyethylene, EC refers to ethylene carbonate, PC refers to propylene carbonate, DEC refers to diethyl carbonate, DMC refers to dimethyl carbonate, PTFE refers to polytetrafluoroethylene, and NMP refers to N-methylpyrrolidone. Background technique [0003] The development of new materials and the development of renewable energy technologies have become one of the major issues for mankind to solve in the 21st century. The chemical power sourc...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M4/36H01M4/58H01M4/587H01M4/62H01M4/66H01M10/0525H01M10/0587B82Y30/00H01M50/431
CPCH01M4/366H01M4/5825H01M4/587H01M4/625H01M4/661H01M10/0525H01M10/0587B82Y30/00H01M50/431Y02P70/50
Inventor 廖宗江邹晓兵
Owner 江西省汇亿新能源有限公司
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