Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Germanium and barium activated lithium iron phosphate anode material

A technology for lithium iron phosphate and positive electrode materials, which can be used in battery electrodes, electrical components, circuits, etc., and can solve problems such as poor conductivity and low tap density

Inactive Publication Date: 2012-02-08
李杰
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is a consensus that lithium iron phosphate has the advantages of good safety, no pollution, stable cycle performance, high specific capacity and low price, but it also has poor conductivity and the disadvantage of lower tap density

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

[0026]Li2CO3 (99.73%), GeO2 (99.8%), BaCO3 (99.8%), FeC2O4.2H2O (99.06%), NH4H2PO4 (98%) raw materials, according to 1mol Li: 0.00002mol Ge: 0.0003mol Ba: 1mol Fe: 1mol P After proportional mixing, high-speed ball milling (rotating speed 200r / min) in absolute ethanol (AR) medium for 20h. After drying at 105-120°C, the precursor is obtained, and the dried precursor is placed in a high-temperature furnace, and calcined at 500-750°C for 24 hours in an ordinary pure nitrogen (>99.5%) atmosphere. That is, the germanium and barium activated lithium iron phosphate cathode material of the present invention is obtained.

Embodiment 2

[0028] Li2CO3 (99.73%), GeO2 (99.8%), BaCO3 (99.8%), FeC2O4.2H2O (99.06%), NH4H2PO4 (98%) raw materials, according to 1mol Li: 0.00004mol Ge: 0.001mol Ba: 1mol Fe: 1mol P After proportional mixing, high-speed ball milling (rotating speed 200r / min) in absolute ethanol (AR) medium for 20h. After drying at 105-120°C, the precursor is obtained, and the dried precursor is placed in a high-temperature furnace, and calcined at 500-750°C for 24 hours in an ordinary pure nitrogen (>99.5%) atmosphere. That is, the germanium and barium activated lithium iron phosphate cathode material of the present invention is obtained.

Embodiment 3

[0030] Li2CO3 (99.73%), GeO2 (99.8%), BaCO3 (99.8%), FeC2O4.2H2O (99.06%), NH4H2PO4 (98%) raw materials, according to 1mol Li: 0.00005mol Ge: 0.003mol Ba: 1mol Fe: 1mol P After proportional mixing, high-speed ball milling (rotating speed 200r / min) in absolute ethanol (AR) medium for 20h. After drying at 105-120°C, the precursor is obtained, and the dried precursor is placed in a high-temperature furnace, and calcined at 500-750°C for 24 hours in an ordinary pure nitrogen (>99.5%) atmosphere. That is, the germanium and barium activated lithium iron phosphate cathode material of the present invention is obtained.

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 provides a germanium and barium activated lithium iron phosphate anode material. The chemical formula of the material can be represented as LiGexBay FePO4, wherein x is equal to 0.0000-0.00005 and y is equal to 0.0003-0.003; the mol ratio of Li, Ge, Ba, Fe and P is as follows: Li to Ge to Ba to Fe to P is equal to 1 mol to 0.00002-0.00005 mol to 0.0003-0.003 mol to 1 mol to 1 mol; as less substituted germanium and barium is doped, the appearance and the grain diameter of a product are easy to control and a stable lithium iron phosphate compound is obtained; the crystal lattice of the lithium iron phosphate compound is activated, the lithium ion diffusion coefficient is improved and the initial discharge capacity reaches 160.52 mAh / g; the potential of a charge-discharge platform corresponding to a lithium electrode is about 3.5 V, the initial discharge capacity exceeds 168 mAh / g and the capacity is attenuated by about 1.2% after 100 times of charge-discharge cycles; and compared with the undoped LiFePO4 comparing embodiment, the specific capacity and the cycling stability of the anode material are greatly improved.

Description

technical field [0001] The germanium and barium activated lithium iron phosphate positive electrode material of the invention belongs to a lithium battery positive electrode material, in particular to a lithium iron phosphate battery positive electrode material. Background technique [0002] At present, the research status of lithium iron phosphate doping modification: lithium iron phosphate LiFePO4 is non-toxic, environmentally friendly, high in safety, rich in raw materials, high in specific capacity, stable in cycle performance, and low in price. The stable discharge platform with a theoretical capacity of 3.5V, the lithium iron phosphate material has high energy density, low price, and excellent safety, and is especially suitable for power batteries. But it has a higher resistivity. Due to lithium iron phosphate, the kinetics of LiFePO4 is not good at room temperature, and the rate performance is extremely poor. Researchers at home and abroad have used methods such as c...

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): H01M4/58
CPCY02E60/10
Inventor 张健张新球吴润秀王晶张雅静李杰李安平李先兰严积芳黄景诚
Owner 李杰
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products