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

Method for preparing high-temperature lithium manganate material for lithium ion power battery

A power battery, lithium manganate technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of rapid material capacity decay, material performance deterioration, poor cycle stability, etc., to achieve outstanding high temperature performance, improve uniformity performance, reliability, and comprehensive performance

Active Publication Date: 2011-05-25
TIANJIN B&M SCI & TECH
View PDF1 Cites 21 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the Jahn-Teller effect, the manganese-oxygen octahedral structure inside the spinel-type lithium manganese oxide material is not stable during the charge-discharge cycle, and the dissolution of divalent manganese causes the material capacity to decay quickly and the cycle stability not good
Material performance deteriorates further when temperature rises

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
  • Method for preparing high-temperature lithium manganate material for lithium ion power battery
  • Method for preparing high-temperature lithium manganate material for lithium ion power battery
  • Method for preparing high-temperature lithium manganate material for lithium ion power battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Prepare the following aqueous solutions for use: 1.5 mol / L (mol / L) manganese sulfate solution, 0.5 mol / L magnesium nitrate (dopant) solution, 2 mol / L sodium hydroxide solution, add 100 dm of sodium hydroxide solution per cubic meter 3 Concentrated ammonia. at 5m 3 Inject 200dm into the stirring constant temperature titanium-lined reactor 3 Pure water, start stirring, set the reaction temperature to 10°C, use a real-time pH automatic control device to control the injection of sodium hydroxide (containing ammonia water), and control the pH range of the system between 11 and 12. Use a metering pump to inject the manganese sulfate and magnesium sulfate solutions into the reactor at multiple points, and control the flow rate to 20dm respectively 3 min -1 and 1.54dm 3 min -1 , Stop injecting after 1.5h. After continuing to react for 1h, the material was discharged. Use a filter press to filter, fully press dry, wash the precipitate with pure water 10 times, press dry a...

Embodiment 2

[0035] Prepare the following aqueous solutions for use: 4mol / L manganese chloride solution, 2mol / L cobalt sulfate (dopant) solution, 5mol / L potassium hydroxide solution, add 200dm of potassium hydroxide solution per cubic meter 3 Concentrated ammonia. at 5m 3 Inject 200dm into the stirring constant temperature titanium-lined reactor 3 Pure water, 50dm 3 Concentrated ammonia water, start stirring, set the reaction temperature to 35°C, use a real-time pH automatic control device to control the injection of potassium hydroxide (containing ammonia water), and control the pH range of the system between 8 and 11. Use a metering pump to inject the manganese chloride and cobalt sulfate solutions into the reactor at multiple points, and control the flow rate to 20dm respectively 3 min -1 and 2dm 3 min -1 , Stop injecting after 1.5h. After continuing to react for 3h, the material was discharged. Use a filter press to filter, fully press dry, wash the precipitate with pure water ...

Embodiment 3

[0038] Prepare the following aqueous solutions for use: 0.5 mol / L manganese nitrate solution, 0.1 mol / L nickel sulfate (dopant) solution, 1 mol / L sodium carbonate solution. at 0.1m 3 Inject 10dm into the stirring constant temperature polytetrafluoroethylene lined reactor 3 Pure water, 0.5dm 3Concentrated ammonia water, start stirring, and set the reaction temperature to 52°C. Use a metering pump to inject manganese nitrate, nickel sulfate and sodium carbonate solutions into the reactor at multiple points, and control the flow rate to 1dm respectively 3 min -1 、0.02dm 3 min -1 and 1.2dm 3 min -1 , Stop injecting after 0.5h. After continuing to react for 0.5h, the material was discharged. Use a centrifugal washing machine to filter and wash, and the solid matter is air-dried at 140° C. for 12 hours. Measure the manganese content of the obtained powder, stir and disperse the powder obtained in the previous step with an appropriate amount of benzene in the reactor, add 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 provides a method for preparing a high-temperature lithium manganate material for a lithium ion power battery. The method comprises the following steps of: 1) preparing a bivalent manganese soluble salt, a doping element soluble salt and a precipitator serving as raw materials into aqueous solution, putting into a reaction kettle to fully react at the temperature of between 1 and 55DEG C and controlling the pH value of a reaction system to be between 8 and 12; 2) filtering after the reaction is finished, and washing a solid matter; 3) blowing to dry an obtained intermediate product at the temperature of between 90 and 150 DEG C; 4) adding a dispersing agent and a coating agent and coating in the reaction kettle; 5) filtering and drying to obtain a precursor; and 6) mixing the precursor and a lithium source according to a proportion, calcining in an oxidation atmosphere at the temperature of between 600 and 1,000 DEG C for 2 to 12 hours, crushing and sieving to obtain a product. The lithium manganate material prepared by the method has high high-temperature adaptability; and the capacity holding ratio exceeds 90 percent after the lithium manganate material is cycled at a high rate for 100 times at the temperature of 45 DEG C.

Description

technical field [0001] The invention relates to a positive electrode material for a lithium ion battery, in particular to a preparation method for a high temperature lithium manganese oxide material for a lithium ion power battery. Background technique [0002] Lithium-ion battery is a secondary battery with high energy density, high power density and long life, which plays an important role in modern society. In small mobile devices, lithium-ion batteries are irreplaceable; at the same time, power lithium-ion batteries are ideal power sources for large, high-power devices such as electric vehicles, hybrid vehicles, and power tools. In such large-scale, high-power applications, there are higher requirements for the safety, energy and power density, and cost of lithium-ion batteries. In lithium-ion batteries, the cathode material is one of the decisive factors for battery performance and cost, and its optimization and optimization is an important direction for the improvemen...

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): H01M4/1391
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 赵明周大桥吕菲徐宁吴孟涛
Owner TIANJIN B&M SCI & TECH
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

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com