Nanometer lithium zirconate-modified lithium iron phosphate composite material and preparation method thereof

A technology of lithium iron phosphate and composite materials, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as unsuitable for high-current charging and discharging, practical application limitations, etc., and achieve low-temperature rate performance Excellent, excellent cycle performance, good dispersion effect

Inactive Publication Date: 2018-08-24
烟台市国有资产经营有限公司
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although LiFePO 4 There are many advantages, but since LiFePO 4 Its own structural characteristics, its ion diffusion coefficient is only 10 -16 ~10 -14 cm 2 /s, the electro

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Nanometer lithium zirconate-modified lithium iron phosphate composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Prepare the lithium iron phosphate composite material modified by nano lithium zirconate, comprising the following steps: (1) be dissolved in deionized water to form a solution A (2) under the protection of a nitrogen atmosphere, lithium hydroxide, ferrous sulfate, and phosphoric acid are mixed in the solution A according to the molar ratio Li:Fe:P=1:1:1, and vitamin C is added to adjust the pH=8 , stirred for 2 hours to form a mixed solution B; (3) Add the mixed solution B to a hydrothermal kettle, pre-react at 130°C for 2.5 hours, and then cool to room temperature to obtain an intermediate product C; (4) Under the protection of a nitrogen atmosphere , in the intermediate product C, add the aqueous solution D containing cocamidopropyl betaine and polyvinylpyrrolidone, wherein the amount of cocamidopropyl betaine added is 0.8wt% of the quality of lithium iron phosphate; The amount of polyvinylpyrrolidone is 0.8wt% of the quality of lithium iron phosphate, then add lithi...

Embodiment 2

[0030]Prepare the lithium iron phosphate composite material modified by nano lithium zirconate, comprising the following steps: (1) be dissolved in deionized water to form a solution A (2) under the protection of nitrogen atmosphere, according to the molar ratio Li:Fe:P=0.9:1:1 ratio lithium hydroxide, ferrous sulfate, phosphoric acid are mixed in solution A, add vitamin C, adjust pH=7 , stirred for 1.5h to form a mixed solution B; (3) Add the mixed solution B to a hydrothermal kettle, pre-react at 125°C for 2 hours, and then cool to room temperature to obtain an intermediate product C; (4) protect the mixture under a nitrogen atmosphere Next, in the intermediate product C, add the aqueous solution D containing cocamidopropyl betaine and polyvinylpyrrolidone, wherein the amount of cocamidopropyl betaine added is 1.3wt% of the quality of lithium iron phosphate; The amount of polyvinylpyrrolidone is 0.9wt% of the quality of lithium iron phosphate, then add lithium hydroxide and ...

Embodiment 3

[0032] Prepare the lithium iron phosphate composite material modified by nano-lithium zirconate, comprising the following steps: (1) be dissolved in deionized water to form a solution A (2) Under the protection of a nitrogen atmosphere, lithium hydroxide, ferrous sulfate, and phosphoric acid are mixed into solution A according to the molar ratio Li:Fe:P=1.1:1:1, and vitamin C is added to adjust the pH=7 , stirred for 2.5h to form a mixed solution B; (3) Add the mixed solution B to a hydrothermal kettle, pre-react at 135°C for 2.5 hours, and then cool to room temperature to obtain an intermediate product C; (4) protect the intermediate product under a nitrogen atmosphere Next, in the intermediate product C, add the aqueous solution D containing cocamidopropyl betaine and polyvinylpyrrolidone, wherein the amount of cocamidopropyl betaine added is 0.9wt% of the quality of lithium iron phosphate; The amount of polyvinylpyrrolidone is 0.6wt% of the quality of lithium iron phosphate...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Login to view more

Abstract

The invention provides a preparation method of a nanometer lithium zirconate-modified lithium iron phosphate composite material. The preparation method comprises the steps of (1) dissolving cocamidopropyl betaine in water to form a solution A; (2) mixing and adding lithium hydrate, ferrous sulfate and phosphoric acid to form a mixed liquid B under protection of nitrogen atmosphere; (3) adding themixed liquid B into a hydrothermal kettle, and performing reaction in advance to obtain a middle product C; (4) adding an aqueous solution containing the cocamidopropyl betaine and polyvinyl pyrrolidone into the middle product C under the nitrogen atmosphere, adding zirconium nitride and excessive amount of lithium hydrate to form a mixed liquid E; (5) performing hydrothermal reaction to obtain amiddle product F; and (6) adding sorbitan laurate into the intermediate product F, and obtaining the composite material after calcination. In the composite material, lithium iron phosphate is used asa core, a nanometer lithium zirconate layer and a carbon layer are sequentially coated from inside to outside, the discharging capacity specific value is 78% or above at -20 DEG C to 25 DEG C, and thecapacity retention ratio after circulation for 1,000 times at 5C is 94% or above.

Description

technical field [0001] The invention relates to the technical field of cathode materials for lithium ion batteries, in particular to a lithium iron phosphate composite material modified with nanometer lithium zirconate and a preparation method thereof. Background technique [0002] Lithium iron phosphate (LiFePO 4 ) is an emerging cathode material for lithium-ion batteries that has great potential and has attracted widespread attention in recent years. LiFePO 4 It has the advantages of wide source of raw materials, relatively low price (about 1 / 5 of lithium cobalt oxide), non-toxic, environmentally friendly, high theoretical specific capacity (about 170mAh / g), and moderate working voltage (3.4V vs. Li+ / Li). What is more prominent is that it has very good thermal stability, superior safety performance (equal to nickel-cadmium batteries), good cycle performance and high specific energy. This also becomes LiFePO 4 The reason why it stands out among many cathode materials. ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01M4/36H01M4/485H01M4/58H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/485H01M4/5825H01M10/0525Y02E60/10
Inventor 周舟王训才苏善金丁雪娇庞成凯张伟陈玉超程洁
Owner 烟台市国有资产经营有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap