Positive pole piece of large multiplying power lithium iron phosphate battery and preparation method thereof

A technology of lithium iron phosphate battery and positive pole piece, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of not being able to meet the high current discharge of lithium ion batteries at the same time, and achieve excellent fluidity, high packing density, and volume. The effect of larger capacity

Inactive Publication Date: 2014-08-06
DONGFENG COMML VEHICLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the defects and problems existing in the prior art that cannot simultaneously meet the high-current discharge of lithium-ion batteries and have a longer battery life, and provide a battery that can extend the battery life on the basis of satisfying the high-current discharge performance of lithium-ion batteries. Positive pole piece of lithium iron phosphate battery with high lifespan and manufacturing method thereof

Method used

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  • Positive pole piece of large multiplying power lithium iron phosphate battery and preparation method thereof
  • Positive pole piece of large multiplying power lithium iron phosphate battery and preparation method thereof
  • Positive pole piece of large multiplying power lithium iron phosphate battery and preparation method thereof

Examples

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Embodiment 1

[0054] A positive electrode sheet of a large-rate lithium iron phosphate battery, the positive electrode sheet includes a current collector and an active material layer coated thereon, the composition of the active material layer and its mass part ratio are: spherical lithium iron phosphate 88 , binder 8, conductive agent 6 (flaky graphite 2, carbon black 2.5, carbon nanotube 1.5); the microscopic morphology of the spherical lithium iron phosphate is a spherical structure, and its material tap density is 1.2g / cm 3 , D50 is ≤ 50nm, the conductive agent is a mixture of carbon black, flake graphite, and carbon nanotubes, and the binder is polyvinylidene fluoride or polyvinylidene fluoride-hexafluoropropylene copolymer;

[0055] The current collector includes aluminum foil and a conductive layer printed on it, the conductive layer includes carbon black, polyvinylidene fluoride or carbon black, polyvinylidene fluoride-hexafluoropropylene copolymer, and the thickness of the conductiv...

Embodiment 2

[0061] The basic content is the same as in Example 1, except that the composition of the active material layer and its mass part ratio are: spherical lithium iron phosphate 92, binder 5, conductive agent 3 (flaky graphite 1, carbon black 1, carbon nanometer Tube 1). The surface internal resistance of the positive pole piece is 500-1000Ω.

Embodiment 3

[0063] The basic content is the same as in Example 1, except that the composition of the active material layer and its mass part ratio are: spherical lithium iron phosphate 95, binder 3, conductive agent 1 (flaky graphite 0.4, carbon black 0.4, carbon nano tube 0.2). The surface internal resistance of the positive pole piece is 1200-2000Ω.

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Abstract

The invention provides a positive pole piece of a large multiplying power lithium iron phosphate battery, which comprises a current collector and an active material layer coated on the positive pole piece, wherein the active material comprises spherical lithium iron phosphate, a binding agent, a conductive agent; the current collector comprises aluminium foil and a conducting layer printed on the current collector; the conducting layer comprises carbon black, polyvinylidene fluoride or polyvinylidene fluoride-hexafluoropropylene copolymer. The preparation method comprises the following steps: the binding agent, the conductive agent and the spherical lithium iron phosphate are sequentially added into N-methylpyrrolidine ketone to obtain uniform positive pole slurry; then the current collector is coated with the positive pole slurry to obtain a coating pole piece; finally, the coating pole piece is rolled to obtain a positive pole piece. According to the design of the positive pole piece, the positive pole piece with high quality is prepared, the service life of the battery can be prolonged on the basis that the requirement for the high-current discharging performance of the applied lithium ion battery is guaranteed, the favorable contact of the current collector and the slurry can be guaranteed and the favorable adhesive property is expressed and the working efficiency is relatively high.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and relates to the production of a lithium iron phosphate positive pole piece, in particular to a positive pole piece of a large-rate lithium iron phosphate battery and a manufacturing method thereof, which are particularly suitable for meeting the high-current discharge requirements of lithium-ion batteries. Extend battery life on top of performance. Background technique [0002] Lithium-ion batteries have the advantages of light weight, high specific energy, high working voltage, long life, and relatively low self-discharge. At the same time, due to the relatively small working current of mobile electronic products, general lithium-ion batteries can meet the requirements, so since commercialization Lithium-ion batteries have been rapidly promoted in the field of mobile electronics. [0003] In the 21st century, the development of new energy vehicles is changing with each passing day. The m...

Claims

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Application Information

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IPC IPC(8): H01M4/136H01M4/1397H01M4/58
CPCY02E60/122H01M4/136H01M4/1397H01M4/5825H01M4/623H01M4/625H01M10/0525Y02E60/10
Inventor 惠怀兵刘立炳孟仙雅冯修成陈果
Owner DONGFENG COMML VEHICLE CO LTD
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