La<3+>, Al<3+>, Fe<3+> and F<-> co-doped composite lithium-rich anode material and preparation method thereof

A lithium-rich cathode material, co-doping technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problem of incomplete understanding of the mechanism of action, and achieve the expansion of intercalation and deintercalation channels, good cycle capacity retention, high ionic The effect of conductivity

Inactive Publication Date: 2013-05-01
NINGBO UNIV
View PDF6 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mechanism of doping lithium ions on the electrochemi

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

[0012] Example 1: LiNO 3 :Mn(CH 3 COO) 2 4H 2 O:Ni(CH 3 COO) 2 4H 2 O:La(NO 3 ) 3 ·6H 2 O:Fe(NO 3 ) 3 9H 2 O:Al(NO 3 ) 3 9H 2 O: LiF is 1.082: 0.5365: 0.4365: 0.009: 0.009: 0.009: 0.009 (molar ratio) ratio is evenly mixed, joins in deionized water, the amount of substance added is the tartaric acid that the total amount of all metal ions is 1.2 times fully stirs to Dissolve completely; raise the temperature of the system to 70°C and continue to stir until 71% of the water evaporates, at this time the solution gradually becomes viscous and forms a jelly. The jelly-like substance was dried in an oven at 130° C. for 22 hours and then ground in a mortar for 10 minutes. The obtained powder was heated to 500°C at a rate of 2°C / min in a tube furnace and calcined at this temperature for 3 hours,

[0013] After cooling, take out the powder, continue to grind it in the mortar for 10 minutes, press the powder into a tablet with a pressure of 100 MPa, then heat up to 850°C...

Embodiment 2

[0014] Example 2: LiNO 3 :Mn(CH 3 COO) 2 4H 2 O:Ni(CH 3 COO) 2 4H 2 O:La(NO 3 ) 3 ·6H 2 O:Fe(NO 3 ) 3 9H 2 O:Al(NO 3 ) 3 9H 2 O: LiF is 1.44: 0.7125: 0.2125: 0.025: 0.025: 0.025: 0.03 (molar ratio) ratio is evenly mixed, joins in deionized water, the amount of substance added is the tartaric acid that all metal ions total amount 1.8 times fully stirs to Dissolve completely; raise the temperature of the system to 85°C and continue to stir until 85% of the water evaporates, then the solution gradually becomes viscous and forms a jelly. The jelly-like mass was dried in an oven at 200° C. for 48 hours and then ground in a mortar for 30 minutes. The obtained powder was heated up to 600°C at a rate of 10°C / min in a tube furnace and calcined at this temperature for 5 hours. After cooling, the powder was taken out and continued to grind in a mortar for 30 minutes, and the powder was pressed with a pressure of 300MPa. It was formed into a sheet, and then calcined in a t...

Embodiment 3

[0015] Embodiment 3: LiNO 3 :Mn(CH 3 COO) 2 4H 2 O:Ni(CH 3 COO) 2 4H 2 O:La(NO 3 ) 3 ·6H 2 O:Fe(NO 3 ) 3 9H 2 O:Al(NO 3 ) 3 9H 2 O: LiF is 1.152: 0.576: 0.376: 0.016: 0.016: 0.016: 0.024 (molar ratio) ratio is evenly mixed, joins in deionized water, the amount of substance added is the tartaric acid that the amount of all metal ions is 1.6 times fully stirs to Dissolve completely; raise the temperature of the system to 78°C and continue to stir until 78% of the water evaporates, at this time the solution gradually becomes viscous and forms a jelly. The jelly-like mass was dried in an oven at 170° C. for 35 hours and then ground in a mortar for 20 minutes. The obtained powder was heated up to 550°C at a rate of 7°C / min in a tube furnace and calcined at this temperature for 4 hours. After cooling, the powder was taken out and continued to grind in a mortar for 20 minutes, and the powder was pressed with a pressure of 200MPa. After being formed into a sheet, the t...

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 discloses a La<3+>, Al<3+>, Fe<3+> and F<-> co-doped composite lithium-rich anode material xLi2MnO3.(1-x)LiMn0.5Ni0.5O2 (x is not less than 0 and not more than 0.5). The anode material is characterized in that a chemical stoichiometric equation is xLi2MnO3.(1-x)Li1-y(Mn0.5Ni0.5)1-m-n-pAlmLanFepO2-yFy, wherein x is not less than 0 and not more than 0.5, m is not less than 0.01 and not more than 0.05, n is not less than 0.01 and not more than 0.05, p is not less than 0.01 and not more than 0.05 and y is not less than 0.01 and not more than 0.06. A preparation method for the anode material comprises the steps as follows: dissolving a soluble lithium compound, soluble magnesium salt, soluble nickel salt, La(NO3)3.6H2O, Al(NO3)3.9H2O, soluble iron salt and lithium fluoride in de-ionized water according to the chemical stoichiometric equation of the molecular formula; adding tartaric acid which is 1.2-2.0 times of the total amount of all metal ions; fully and uniformly stirring until tartaric acid is fully dissolved; and concentrating, gelling, drying, grinding, decomposing, tabletting and calcining a solution to obtain the anode material. The prepared anode material is excellent in cyclic capacity retention capability and rate performance.

Description

technical field [0001] The invention relates to the field of manufacturing positive electrode materials of lithium ion batteries. Background technique [0002] Lithium-ion batteries have absolute advantages such as high volume, high weight-to-energy ratio, high voltage, low self-discharge rate, no memory effect, long cycle life, and high power density. They have an annual share of more than 30 billion US dollars in the global mobile power market and far exceed other The market share of batteries is the most promising chemical power source [Wu Yuping, Wan Chunrong, Jiang Changyin, Lithium-ion Secondary Batteries, Beijing: Chemical Industry Press, 2002.]. However, since the commercialization of lithium-ion batteries in 1991, the actual specific capacity of cathode materials has always hovered between 100-180mAh / g, and the low specific capacity of cathode materials has become a bottleneck for improving the specific energy of lithium-ion batteries. In order to effectively incre...

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): H01M4/505H01M4/525
CPCY02E60/122Y02E60/10
Inventor 徐玲霞水淼程亮亮杨天赐舒杰冯琳任元龙郑卫东高珊徐晓萍
Owner NINGBO 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