Process for producing carbon coated iron lithium phosphate

A lithium iron phosphate, carbon coating technology, applied in chemical instruments and methods, electrode manufacturing, phosphorus compounds, etc., can solve the problems of difficulty in industrial production, loud noise, and high equipment requirements

Inactive Publication Date: 2008-05-07
HANGZHOU DIANZI UNIV
View PDF5 Cites 61 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of raw material production, storage and transportation, measures need to be taken to prevent the oxidation of divalent iron source, so the cost is high
In this case, even after a long time of heat preservation, the raw material cannot completely generate lithium iron phosphate
In order to refine ferric oxi

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Mix phosphoric acid, ferric oxide and glucose, and dry at 80°C. Wherein the molar ratio of Fe and P is 1:1, and the mass of glucose is 10% of the mass of ferric oxide. Add lithium hydroxide, add water and mix, wherein the ratio of Li and P is 1:1. Dry the product at 160° C., and transfer the product to an atmosphere protection furnace. Insulate at 500°C for 20 hours, then cool to 200°C with the furnace. Its 1C capacity was measured to be 130mAh / g, and the capacity was basically not attenuated after 50 cycles.

Embodiment 2

[0025] Mix phosphoric acid, ferric oxide, manganese carbonate and sucrose, and dry at 160°C. Wherein the molar ratio of Fe, Mn and P is 0.95:0.05:1, and the mass of sucrose is 15% of the mass of ferric oxide. Add lithium carbonate, add water and mix, wherein the ratio of Li and P is 0.95:1. Dry the product at 100°C, and transfer the product to an atmosphere protection furnace. Insulate at 600°C for 10 hours, then cool to 150°C with the furnace. Its 1C capacity was measured to be 129mAh / g, and the capacity was basically not attenuated after 50 cycles.

Embodiment 3

[0027] Mix phosphoric acid, ferric oxide, nickel nitrate and starch, and dry at 100°C. Wherein the molar ratio of Fe, Ni and P is 0.98:0.02:1, and the mass of starch is 20% of the mass of ferric oxide. Add the mixture of lithium hydroxide and lithium carbonate, add water and mix, wherein the ratio of Li and P is 1.05:1, and the molar ratio of lithium hydroxide and lithium carbonate is 2:1. Dry the product at 80°C, and transfer the product to an atmosphere protection furnace. Insulate at 700°C for 5 hours, then cool to 100°C with the furnace. Its 1C capacity was measured to be 127mAh / g, and the capacity was basically not attenuated after 50 cycles.

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

No PUM Login to view more

Abstract

The invention relates to a preparation method of lithium iron phosphate for the carbon cladding of a lithium ion battery. The prior lithium iron phosphate preparation technical art is complex, and has high cost. The invention has the synthetic process that: ferric oxide, phosphoric acid, simple organics and doped element compound are mixed and dried, the mol ratio of phosphate radical ion, ferric ion and doped element ion is 1:y:z, wherein, y is larger than or equal to 0.95 and smaller than or equal to 1, and y plus z is equal to 1; the mixture is added with lithium source compound, added with water to be mixed and dried, the mol ratio of lithium ion and phosphate radical ion is x:1, and x is larger than or equal to 0.95 and smaller than or equal to 1.05; the mixture which reacts for 2 to 20 hours under 500 to 800 DEG C is cooled in a furnace. The invention finally produces the precursor uniformly mixed with superfine crystal grain, and during the subsequent high temperature solid phase reaction, the end product lithium iron phosphate can be produced through shorter distance diffuseness of atoms. The end product has high purity, the crystallisation is good, the capacity is high, and the cycle stability is good.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and in particular relates to a preparation method of carbon-coated lithium iron phosphate used for lithium-ion batteries. technical background [0002] Lithium-ion batteries are an excellent battery system. It has the characteristics of high energy density, no memory effect, no pollution, and long life. With the advancement of lithium-ion battery technology, it also has the characteristics of high safety and can be made into any shape, so it is an ideal energy storage device. [0003] Lithium-ion batteries are widely used in various electronic devices, such as laptop computers, mobile phone batteries, digital cameras, portable lighting equipment, etc. At the same time, it is also used in electric tools, electric bicycles and electric vehicles. With the gradual consumption of the world's oil resources and the gradual improvement of society's requirements for environmental protection, e...

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): C01B25/45B22F1/02H01M4/58H01M4/48H01M4/04H01M4/62
CPCY02E60/12Y02E60/10
Inventor 倪华良糜裕宏季振国
Owner HANGZHOU DIANZI UNIV
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