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Composite positive pole material for lithium ion battery and preparation method of the composite material

A composite cathode material, lithium-ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as application limitations

Inactive Publication Date: 2012-07-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But LiFePO 4 The theoretical specific capacity of LiFePO is about 170mAh / g, which is only a little more than 10% of the theoretical specific capacity of elemental sulfur, which makes LiFePO 4 The application as a cathode material for high-capacity lithium-ion batteries has been greatly limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A lithium ion battery composite positive electrode material, made of LiFePO 4 compound and elemental sulfur; wherein the LiFePO 4 The compound is a porous compound with nanoscale pores, and the elemental sulfur exists in the LiFePO 4in the nanoscale pores of the compound. It contains 20wt% elemental sulfur, and the rest is porous LiFePO 4 compound.

[0019] The preparation process of the above-mentioned lithium-ion battery composite cathode material is as follows:

[0020] 1 Weigh Li according to the stoichiometric ratio of 1:3:3 3 PO 4 , FeC 2 o 4 2H 2 O and (NH 4 ) 2 HPO 4 , mixed with ethanol as a dispersant, and ball milled on a planetary ball mill for 4 hours at a speed of 400 rpm.

[0021] 2. Wash the ball milled product five times with deionized water and ethanol respectively, and then dry it at 90°C.

[0022] 3. Add 2.5g of template agent CTAB to 100ml of deionized water, then weigh 4g of the product obtained in the second step into the deionized wa...

Embodiment 2

[0030] The specific steps are the same as in Example 1, except that SDS is used for template selection.

[0031] Composite positive electrode material: containing 27wt% elemental sulfur, the rest is porous LiFePO 4 Compound (template agent is SDS).

[0032] Appearance and performance: black powder, fine particles. Observing the microstructure with a TEM transmission electron microscope, the hole diameter is about 3.4nm, which has good uniformity.

[0033] Material properties: The above positive electrode material, acetylene black and PVDF are made into a positive electrode sheet at a ratio of 8:1:1, and finally the button battery is assembled with the prepared positive electrode sheet, and finally the assembled battery is tested by the LAND battery test system , the results show that the specific capacity of the battery can reach 1052mAh / g for the first discharge, and after 20 cycles, the capacity remains at about 920mAh / g, which shows that mesoporous lithium iron phosphate ...

Embodiment 3

[0035] The specific steps are the same as in Example 1, except that P123 is used for template selection.

[0036] Composite cathode material: containing 35wt% elemental sulfur, the rest is porous LiFePO 4 Compound (template agent is P123).

[0037] Appearance and performance: black powder, fine particles. Observing the microstructure with TEM transmission electron microscope, the hole diameter is about 5.1nm, which has good uniformity.

[0038] Material properties: The above positive electrode material, acetylene black and PVDF are made into a positive electrode sheet at a ratio of 8:1:1, and finally the button battery is assembled with the prepared positive electrode sheet, and finally the assembled battery is tested by the LAND battery test system , the results show that the specific capacity of the battery can reach 916mAh / g for the first discharge, and after 20 cycles, the capacity remains at about 886mAh / g, which shows that mesoporous lithium iron phosphate has a good a...

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Abstract

The invention provides a composite positive pole material for a lithium ion battery, belonging to the technical field of composite functional materials. The composite positive pole material for the lithium ion battery is formed by compounding LiFePO4 as a compound with elemental sulfur, wherein LiFePO4 is a porous compound with nanometer pores; and elemental sulfur is present in the nanometer pores of LiFePO4. According to the invention, Li3PO4, FeC2O4.2H2O and (NH4)2HPO4 serve as the raw materials to prepare porous lithium iron phosphate (LiFePO4) by a hydrothermal template method; and a method of compounding gaseous sulfur with porous lithium iron phosphate is adopted to prepare the composite positive pole material. The elemental sulfur is fixed in the pores of LiFePO4, therefore, the irreversible loss of active materials caused by dissolution of the discharging product of sulfur into an electrolyte can be prevented, and the recycling performance of the positive pole material and the utilization rate of active materials can be improved. Meanwhile, the porous LiFePO4 serving as the supporting material of elemental sulfur is a good positive pole material for the lithium ion battery, and contributes to the specific capacity of the whole composite positive pole material.

Description

technical field [0001] The invention belongs to the technical field of composite functional materials, and relates to a positive electrode material of a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion battery is a new generation of secondary battery after lead-acid battery, nickel-cadmium battery and nickel-metal hydride battery. It has high working voltage, large capacity, less self-discharge, long cycle life, no memory effect, no environmental pollution and operating temperature range. Wide and other significant advantages, as a replacement product of the power supply, it is considered to be an ideal choice for high-capacity, high-power batteries, and is a green and environmentally friendly power supply in the 21st century. Since its inception, it has been widely used in portable electronic devices such as mobile phones, notebook computers, and electric vehicles. It is expected that large-capacity lithium-ion batteries will b...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/58
CPCY02E60/12Y02E60/10
Inventor 王宁窦延军何泓材陈海军
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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