Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of preparation method of lithium-ion battery cathode material modified molybdenum trioxide

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of electrode active material loss, active point disappearance, capacity decline, etc., to achieve inhibition of dissolution, inhibition of structural distortion, and high specific capacity Effect

Inactive Publication Date: 2015-09-23
HUBEI UNIV OF ARTS & SCI
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reasons for the capacity decline include two aspects: one is that with the intercalation of lithium, [MoO 6 ] The octahedron will be slightly distorted, so that some active points of intercalation and desorption of lithium in the crystal structure will disappear; second, due to the long-term contact between the electrode material and the electrolyte, some molybdenum ions will dissolve into the electrolyte, which will also cause electrode activity. loss of material

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
  • A kind of preparation method of lithium-ion battery cathode material modified molybdenum trioxide
  • A kind of preparation method of lithium-ion battery cathode material modified molybdenum trioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Production of molybdenum trioxide cathode material (ZnO) co-modified by doping and coating 0.05 (MoO 3 ) 0.95 / TiO 2 Powder 4.9g, yield 98%. Specific steps are as follows:

[0022] (1) Mix 5.67g ammonium paramolybdate tetrahydrate and 0.5g zinc nitrate hexahydrate, and the mass ratio of molybdenum salt and zinc salt is 1:0.088. Add zirconium balls with a material-to-ball ratio of 1:4 into the ball mill jar, and ball mill the mixture for 1 hour at a speed of 250 rpm on a planetary ball mill.

[0023] (2) Put the ball-milled mixture into a muffle furnace, heat up to 450°C at a rate of 8°C / min, keep it warm for 12 hours, and cool down to room temperature with the furnace to obtain an intermediate product, that is, zinc-doped molybdenum trioxide Positive electrode material powder 4.7g, molecular formula is (ZnO) 0.05 (MoO 3 ) 0.95 ;

[0024] (3) After the intermediate product is ground, pour it into a mixed solvent of 38g of water and absolute ethanol, w...

Embodiment 2

[0027] Example 2: Production of molybdenum trioxide cathode material (ZnO) co-modified by doping and coating 0.01 (MoO 3 ) 0.99 / TiO 2 Powder 3.75g, yield 98.7%. Specific steps are as follows:

[0028] (1) Mix 4.59g ammonium paramolybdate tetrahydrate and 0.058g zinc acetate dihydrate, wherein the mass ratio of molybdenum salt and zinc salt is 1:0.013. Add zirconium balls with a material-to-ball ratio of 1:4 into the ball mill pot, and ball mill the mixture on a planetary ball mill at a speed of 200 rpm for 0.5 hours.

[0029] (2) Put the ball-milled mixture into a muffle furnace, raise the temperature to 450°C at a rate of 5°C / min, keep it warm for 10 hours, and cool to room temperature with the furnace to obtain an intermediate product, that is, zinc-doped molybdenum trioxide Positive electrode material powder 3.71g, molecular formula is (ZnO) 0.01 (MoO 3 ) 0.99 ;

[0030] (3) After the intermediate product is ground, it is poured into a mixed solvent of 30 g of wat...

Embodiment 3

[0033] Example 3: Production of molybdenum trioxide cathode material (ZnO) co-modified by doping and coating 0.1 (MoO 3 ) 0.9 / TiO 2 Powder 8.5g, yield 97.7%. Specific steps are as follows:

[0034] (1) Mix 9.3g ammonium paramolybdate tetrahydrate and 1.28g zinc acetate dihydrate, wherein the mass ratio of molybdenum salt and zinc salt is 1:0.14. Add zirconium balls with a material-to-ball ratio of 1:4 into the ball mill jar, and ball mill the mixture for 1.5 hours at a speed of 300 rpm on a planetary ball mill.

[0035] (2) Put the ball-milled mixture into a muffle furnace, heat up to 450°C at a rate of 10°C / min, keep it warm for 13 hours, and cool down to room temperature with the furnace to obtain an intermediate product, namely molybdenum trioxide doped with zinc Positive electrode material powder 8g, molecular formula is (ZnO) 0.1 (MoO 3 ) 0.9 ;

[0036] (3) After the intermediate product is ground, it is poured into a mixed solvent of 64g of water and absolute e...

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
retention rateaaaaaaaaaa
retention rateaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of a lithium ion battery positive electrode material modified molybdenum trioxide. The preparation method comprises the following steps: carrying out ball grinding and mixing on a molybdenum salt and a zinc salt and calcining in a muffle furnace to obtain an intermediate product, namely the zinc-doped molybdenum trioxide material having the molecular formula (ZnO)x(MoO3)[1-x] (x is more than 0 and less than or equal to 0.1); adding the intermediate product to a mixed solvent of water and absolute ethyl alcohol, dropwise adding titanate to the mixed system under the stirring condition, and adding a hydrolysis accelerant, so that metatitanic acid generated by hydrolysis of the titanate is coated on the surface of the molybdenum trioxide material; and calcining to obtain molybdenum trioxide electrode material which is co-modified by doping and coating and has the molecular formula (ZnO)x(MoO3)[1-x] / TiO2. According to the preparation method, the molybdenum trioxide material is subjected to modified treatment by means of doping and coating, so that the structure stability of the molybdenum trioxide material in a lithiation / delithiation process is enhanced. The preparation method disclosed by the invention is simple in process; the prepared material is high in specific capacity and good in cycle performance.

Description

technical field [0001] The invention belongs to the field of lithium-ion secondary battery cathode materials, and in particular relates to a preparation method of modified molybdenum trioxide as a lithium-ion battery cathode material. Background technique [0002] Lithium-ion secondary battery is a newly developed green power source in the 1990s. It has attracted the attention of researchers due to its excellent performance such as high reversible capacity, high voltage, high cycle performance and high energy density. It is called the leading battery in the 21st century power supply. The research on lithium-ion battery cathode materials mainly focuses on lithium cobalt oxide LiCoO 2 , lithium nickel oxide LiNiO 2 , LiFePO with olivine structure 4 and spinel-structured LiMn 2 o 4 superior. Currently commercialized lithium-ion batteries mainly use LiCoO 2 As a cathode material, due to the increasing scarcity of cobalt resources, the relatively high price and cer...

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
Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1395H01M4/1391H01M4/485H01M4/60
CPCH01M4/48H01M4/628Y02E60/10
Inventor 崔萍梁英赵燕萍
Owner HUBEI UNIV OF ARTS & SCI