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Large-particle-size lithium iron phosphate composite material for lithium ion battery cathode, preparation method of large-particle-size lithium iron phosphate composite material and lithium ion battery comprising large-particle-size lithium iron phosphate composite material

A lithium-ion battery and lithium iron phosphate technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor safety, unavoidable adverse reactions of electrolyte and inner layer materials, etc., and achieve good safety, Excellent high temperature stability and long cycle life

Inactive Publication Date: 2018-10-26
福建荣华科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When some electrode pastes are prepared, the shortcomings of other positive electrode active materials are usually retained, such as poor safety
Some cannot avoid the adverse reaction of electrolyte and inner material, etc.

Method used

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  • Large-particle-size lithium iron phosphate composite material for lithium ion battery cathode, preparation method of large-particle-size lithium iron phosphate composite material and lithium ion battery comprising large-particle-size lithium iron phosphate composite material
  • Large-particle-size lithium iron phosphate composite material for lithium ion battery cathode, preparation method of large-particle-size lithium iron phosphate composite material and lithium ion battery comprising large-particle-size lithium iron phosphate composite material

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preparation example Construction

[0029] In addition, the embodiment of the present invention also provides a preparation method of the above-mentioned large particle size lithium iron phosphate composite material for the positive electrode of the lithium ion battery, for example, may include the following steps: applying an adhesive to the surface of the core material and adhering the lithium iron phosphate Attached to the surface of the core, dried, and vapor layered so that the carbon material is coated on the surface of the shell to form a carbon material layer.

[0030] The purpose of the adhesive is to make the core material and the shell material adhere more firmly. As an option, the adhesive can include PTFE, PVDF, polyvinyl alcohol, polyacrylamide, guar gum and xanthan gum. At least one, and may also include other adhesives that can achieve the above-mentioned bonding effect between the core material and the shell material in the battery field. Alternatively, the concentration of the binder may be 0.1...

Embodiment 1

[0041] This embodiment provides a large particle size lithium iron phosphate composite material with a D50 of 18 microns for the positive electrode of a lithium ion battery, and its preparation method is as follows:

[0042] Add 1 gram of lithium cobaltate with a D90 of 11 microns in the mortar as the core, spray a polyvinyl alcohol aqueous solution with a solubility of 0.2wt% until the lithium cobaltate powder is wet but there is no flowing liquid, add 5 grams of small particles of D90 to 4 Micron lithium iron phosphate, rolling to make lithium iron phosphate adhere to the surface of the core, slight grinding during the rolling process so that the shell and the core have no obvious agglomeration.

[0043] Then dry at 105°C.

[0044] Using acetylene as the gas source, in the plasma-assisted gas-phase lamination device, the reaction chamber was reacted for 30 minutes under the conditions of the pressure of 15Pa and the power of 60W, so that the carbon material was coated on the...

Embodiment 2

[0046] This embodiment provides a large particle size lithium iron phosphate composite material with a D50 of 20 microns for the positive electrode of a lithium ion battery, and its preparation method is as follows:

[0047] Add 1 gram of lithium manganate with a D90 of 14 microns in the mortar as the core, spray a polyacrylamide aqueous solution with a solubility of 0.1wt% until the lithium manganate powder is wet but there is no flowing liquid, add 4 grams of small particles of D90 to 4 Micron lithium iron phosphate, rolling to make lithium iron phosphate adhere to the surface of the core, slight grinding during the rolling process so that the shell and the core have no obvious agglomeration.

[0048] Then dry at 105°C.

[0049] Using acetylene as the gas source, in the plasma-assisted gas-phase lamination device, the reaction chamber was reacted for 25 minutes under the conditions of the pressure of 18Pa and the power of 70W, so that the carbon material was coated on the su...

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Abstract

The invention relates to a large-particle-size lithium iron phosphate composite material for a lithium ion battery cathode, a preparation method of the large-particle-size lithium iron phosphate composite material and a lithium ion battery comprising the large-particle-size lithium iron phosphate composite material, and belongs to the field of a battery. The composite material comprises a core, ahousing adhered to the surface of the core, and a carbon material layer coating the surface of the housing. A material of the core comprises any one of lithium nickel cobalt manganese oxide, lithium cobalt oxide and lithium manganese oxide, and a material of the housing is lithium iron phosphate. The large-particle-size lithium iron phosphate composite material is low in cost, high in energy density, good in electrical conductivity and high in bulk density. The preparation method comprises the steps of: applying an adhesive to the surface of the core and adhering the lithium iron phosphate tothe surface of the core; carrying out drying; and carrying out gas phase lamination to coat the carbon material on the surface of the housing so as to form the carbon material layer. The method is simple, can increase a particle size of the lithium iron phosphate composite material, and reduces influences of reduction of electrical conductivity, reduction of charge-discharge capacity and the likeof the material, which are caused after the particle size of lithium iron phosphate particles is increased, to a certain degree. The lithium ion battery comprising the composite material is high in safety, long in cycle life and high in high-temperature stability.

Description

technical field [0001] The invention relates to the field of batteries, and in particular to a large particle size lithium iron phosphate composite material for positive electrodes of lithium ion batteries, a preparation method thereof, and a lithium ion battery. Background technique [0002] Among the currently commercialized cathode materials for lithium-ion batteries, lithium iron phosphate has poor conductivity and low energy density compared to other cathode materials with good conductivity. [0003] Some manufacturers granulate the material before sintering to increase the size of the material particles. Because there are more carbon source substances between the particles, gas is generated during the sintering and carbonization process, and more voids are left inside the particles. The bulk density of the material is reduced. When some electrode pastes are prepared, the shortcomings of other positive electrode active materials are usually retained, such as poor safet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/5825H01M4/624H01M4/625H01M10/0525Y02E60/10
Inventor 郑明森黄海宏
Owner 福建荣华科技有限公司