Lithium iron phosphate battery positive electrode active material as well as preparation method and application

A positive electrode active material, lithium iron phosphate battery technology, applied in the direction of battery electrodes, phosphate, phosphorus oxyacid, etc., can solve the problems of increasing material costs, to prevent local agglomeration, reduce internal resistance, balance electron transport and lithium The effect of ion transport

Inactive Publication Date: 2018-02-27
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, silver powder as a conductive additive is easy to cause safety hazards, and silver

Method used

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  • Lithium iron phosphate battery positive electrode active material as well as preparation method and application
  • Lithium iron phosphate battery positive electrode active material as well as preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The positive electrode sheet includes: a current collector, a first layer of active material coating coated on the current collector, and a second layer of active material coating coated on the surface of the first layer of active material.

[0033] The current collector is a common commercial aluminum foil with an average thickness of 19 μm;

[0034] The first layer of active material coating is prepared by 7.5 parts of SP, 82.5 parts of lithium iron phosphate, and 10 parts of PVDF in parts by weight;

[0035] Among them, SP is a conductive agent with D50 of 50nm, the average particle size of lithium iron phosphate is 500nm, and the capacity at 0.1C can reach 155mAhg -1 , PVDF chemical composition is polyvinyl chloride, as the first type of binder.

[0036] The second layer of active material coating is prepared from 2.5 parts of SP, 87.5 parts of lithium iron phosphate and 10 parts of PVDF in parts by weight.

[0037] Among them, SP, lithium iron phosphate and PVDF ...

Embodiment 2

[0048] The difference from Example 1 is that

[0049] The first active material coating is prepared in parts by weight from 5 parts of SP, 2.5 parts of carbon nanotubes, 82.5 parts of lithium iron phosphate, and 10 parts of PVDF;

[0050] The length of the carbon nanotube is 10-20 microns, and the electrical conductivity of the powder is ≤70Ω.cm.

[0051] The second layer of active material coating is prepared from 2 parts of SP, 1.5 parts of carbon nanotubes, 86.5 parts of lithium iron phosphate, and 10 parts of PVDF in parts by weight.

Embodiment 3

[0053] The difference from Example 1 is that

[0054] The first active material coating is prepared in parts by weight from 7 parts of SP and 1 part of graphene, 83 parts of lithium iron phosphate, and 10 parts of PVDF;

[0055] The graphene has a particle size distribution of 3-5 μm, and the electrical conductivity of the powder is ≤10Ω.cm.

[0056] The second layer of active material coating is prepared by parts by weight from 3 parts of SP, 1 part of graphene, 86 parts of lithium iron phosphate, and 10 parts of PVDF.

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a lithium iron phosphate battery positive electrode active material capable of reducing the polarization effectof the lithium iron phosphate battery and improving the electrochemical (rate capacity) of the lithium iron phosphate battery as well as a preparation method and application. The active material is divided into two layers, i.e. a first layer of active material and a second layer of active material coating the surface of the first layer of active material; the first layer of active material is prepared from the following components in parts by weight: 80 to 95 parts of lithium iron phosphate positive electrode material, 3 to 12 parts of conducting agent, 3 to 10 parts of category-I binder; andthe second layer of active material is prepared from the following components in parts by weight: 85 to 98 parts of lithium iron phosphate positive electrode material, 1 to 8 pars of conducting agent,and 5 to 8 parts of category-II binder. The battery polarization of a double-layer lithium iron phosphate positive electrode material pole piece prepared by adopting the modification method disclosedby the invention is greatly reduced compared to that of the ordinary lithium iron phosphate pole piece containing the same conducting agent, so that the rate capacity of the lithium iron phosphate isapparently improved. Meanwhile, the circulating performance of the product is excellent.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a cathode active material for reducing the polarization effect of lithium iron phosphate batteries and improving the electrochemical (rate performance) of lithium iron phosphate batteries, and its preparation and application. Background technique [0002] As a new generation of secondary batteries, lithium-ion batteries are considered to be the most promising secondary batteries. Compared with secondary batteries such as traditional lead-acid batteries, nickel-metal hydride batteries, and nickel-cadmium batteries, lithium-ion batteries have many advantages such as high operating voltage, long cycle life, high energy density, and no memory function. Since the emergence of lithium-ion batteries in the 1990s, with the continuous development and progress of lithium-ion battery materials and key technologies, they have been widely used in electronic products, new energy ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M10/0525C01B25/26C01B25/45C01B25/37
CPCC01B25/26C01B25/375C01B25/45H01M4/366H01M4/5825H01M10/0525Y02E60/10
Inventor 武建飞刘涛孙士美
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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