Lithium ferrovanadium phosphate solid solution for positive material of lithium ion battery and preparation and application thereof

A lithium vanadium iron phosphate, lithium ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor electrical conductivity and current rate characteristics, attenuation, poor main cycle performance, etc., to achieve high specific capacity, High safety and controllable particle size

Active Publication Date: 2012-05-09
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the previous single LiFePO 4 The main body has poor conductivity and current rate characteristics and a single Li 3 V 2 (PO 4 ) 3 For the defects of poor cycle performance and serious attenuation of the main body, a lithium vanadium iron phosphate solid solution, a positive electrode material for lithium-ion batteries, is provided. This material has the advantages of good cycle performance, superior rate performance, high specific capacity, and high safety.

Method used

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  • Lithium ferrovanadium phosphate solid solution for positive material of lithium ion battery and preparation and application thereof
  • Lithium ferrovanadium phosphate solid solution for positive material of lithium ion battery and preparation and application thereof
  • Lithium ferrovanadium phosphate solid solution for positive material of lithium ion battery and preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0048] X takes 0.1 to prepare LiFe 0.1 V 0.6 PO 4 Cathode material. Atomization drying carbothermal reduction method.

[0049] Step 1, raw material homogenization treatment: take lithium nitrate, iron nitrate, ammonium metavanadate, ammonium dihydrogen phosphate according to Li:Fe:V:P molar ratio is 1:0.1:0.6:1, dissolve in water, press The content of carbon accounts for 20wt% of the total amount of the matrix. Add carbon black, then add 5g of surfactant Tween 80, and make 1000mL suspension slurry with deionized water. After the mixture was fully stirred in a high-speed disperser for 2 hours, a well-dispersed suspension slurry was obtained as precursor liquid A.

[0050] Step 2. Precursor preparation: Dry and dehydrate the precursor solution A with a centrifugal atomization dryer, add the slurry to the spray dryer at a rate of 15mL / min, and keep the inlet and outlet temperatures at about 200°C and 100°C, respectively Left and right, the dried powder is collected in a cycl...

Embodiment 2

[0055] X takes 0.2 to prepare LiFe 0.2 V 0.53 PO 4 Cathode material. solid phase method.

[0056] Step 1, raw material homogenization treatment: according to Li: Fe: V: P molar ratio is 1: 0.2: 0.53: 1, weigh lithium carbonate, iron phosphate, vanadium pentoxide, account for 1wt of the total amount of matrix according to the content of carbon % Add sucrose, add distilled water, place in a ball mill and grind for 12 hours to obtain precursor A.

[0057] Step 2, heat treatment: put this precursor A in a sintering furnace, and heat it under nitrogen at 800°C for 12 hours to prepare the positive electrode material LiFe for lithium-ion batteries. 0.2 V 0.53 PO 4 / C, the material is black powder. Its X-ray diffraction pattern (XRD) see figure 1 , indicating that there are no other impurities, a complete crystal is obtained, and the crystal structure is between the olivine structure and the NASCION structure. Its X-ray photoelectron spectroscopy (XPS) see figure 2 , indica...

Embodiment 3

[0059] X takes 0.3 to prepare LiFe 0.3 V 0.47 PO 4 Cathode material. Atomization drying carbothermal reduction method.

[0060] Step 1, raw material homogenization treatment: according to Li: Fe: V: P molar ratio is 1: 0.3: 0.47: 1, weigh lithium carbonate, ferric nitrate, ammonium metavanadate, diammonium hydrogen phosphate, dissolve in water, press The content of carbon accounts for 30wt% of the total amount of the matrix. Add acetylene black, then add 5g of cetyltrimethylammonium chloride, and make 1000mL suspension slurry with deionized water. After the mixture was fully stirred in a high-speed disperser for 2 hours, a well-dispersed suspension slurry was obtained as precursor liquid A.

[0061] Step 2. Precursor preparation: Dry and dehydrate the precursor solution A with a centrifugal atomization dryer, add the slurry to the spray dryer at a rate of 15mL / min, and keep the inlet temperature and outlet temperature at about 260°C and 100°C, respectively Left and right,...

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Abstract

The invention relates a lithium ferrovanadium phosphate solid solution for a positive material of a lithium ion battery and preparation and application thereof, belonging to the technical field of battery materials. The invention provides a lithium ferrovanadium phosphate solid solution for the positive material of the lithium ion battery; the lithium ferrovanadium phosphate solid solution integrates the advantages of lithium ferric phosphate and lithium vanadium phosphate, overcomes the defects of the prior art caused by using the single lithium ferric phosphate or the single lithium vanadium phosphate as a main body, and has the advantages of good cycle performance, excellent multiplying power performance, high specific capacity, high safety and the like. The invention also provides a preparation method of the lithium ferrovanadium phosphate solid solution for the positive material of the lithium ion battery and the application of the lithium ferrovanadium phosphate solid solution to the positive material of the lithium ion battery with high multiplying power and high power capacity.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a cathode material for a lithium ion battery and a preparation method and application thereof. Background technique [0002] Lithium-ion battery is a new generation of secondary battery after nickel-cadmium and nickel-metal hydride batteries. Among them, the positive electrode material is very important for improving the important performances such as working voltage, specific energy and cycle life of lithium-ion batteries. Currently commonly used is LiCoO 2 , LiMn 2 o 4 and LiNiO 2 . However, the lack of cobalt resources limits the LiCoO 2 Applications of LiNiO 2 Difficult to synthesize, there is an obvious exothermic reaction during charging and discharging, which may cause safety problems, LiMn 2 o 4 When working near 50°C, the capacity fades quickly, which is a factor restricting its development. Therefore, finding new materials with better cost performanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/136H01M4/1397H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 杨岩峰于锋张敬杰宋广智
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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