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

Lithium and manganese-rich cathode material of lithium ion battery and preparation method of cathode material

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low initial Coulombic efficiency, large initial irreversible capacity, and poor cycle stability, so as to improve electrochemical performance and suppress irreversible Good chemical reaction and material processing performance

Active Publication Date: 2014-12-24
CHERY AUTOMOBILE CO LTD
View PDF8 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] To sum up, there are the following technical problems in the prior art: one of the biggest problems in the positive electrode material is that when it is charged above 4.5V for the first time, an irreversible electrochemical reaction occurs, resulting in a large first irreversible capacity of the material, the first time Coulombic efficiency is low and cycle stability is poor

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
  • Lithium and manganese-rich cathode material of lithium ion battery and preparation method of cathode material
  • Lithium and manganese-rich cathode material of lithium ion battery and preparation method of cathode material
  • Lithium and manganese-rich cathode material of lithium ion battery and preparation method of cathode material

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0040] A preparation method of lithium-rich manganese cathode material for lithium ion battery, the lithium-rich manganese material is Li 2 TiO 3 Coated xLi 2 MnO 3 ·(1-x)LiNi 0.5-a / 2 mn 0.5-a / 2 al a o 2 (wherein, 0.1≤x≤0.9, 0.002≤a≤0.1) materials, the nickel-manganese-aluminum composite carbonate precursor is prepared by the co-precipitation method, and then sintered at high temperature to obtain a spherical or quasi-spherical nickel-manganese-aluminum composite oxide, Adding it into a solvent to disperse evenly, adding tetrabutyl titanate, hydrolyzing to obtain a nickel-manganese-aluminum-titanium compound compound, mixing with a lithium compound, and calcining to obtain a lithium-rich manganese cathode material. in particular:

[0041] Step 1. Preparation of Precursor

[0042] According to xLi 2 MnO 3 ·(1-x)LiNi 0.5-a / 2 mn 0.5-a / 2 al a o 2 In the chemical formula, the stoichiometric ratio of Ni, Mn, and Al is weighed to form a uniform mixed aqueous solution of...

Embodiment 1

[0048] The present embodiment provides a kind of preparation method of lithium-ion battery lithium-rich manganese cathode material, and this material is Li 2 TiO 3 Coated 0.5Li 2 MnO 3 0.5LiNi 0.485 mn 0.485 al 0.03 o 2 Material, Li 2 TiO 3 Accounting for 3.5% of the total mass of lithium-rich manganese. It includes the following steps.

[0049] Step 1. Preparation of Precursor

[0050] According to 0.5Li 2 MnO 3 0.5LiNi 0.485 mn 0.485 al 0.03 o 2 In the chemical formula, the stoichiometric ratio of Ni, Mn, and Al is weighed to form a uniform mixed aqueous solution of nickel sulfate, manganese nitrate, and aluminum sulfate. The total concentration of metal ions is 0.5mol / L. The temperature of the solution is controlled at a constant temperature of 40°C. Under stirring, Add the precipitating agent lithium carbonate to the mixed solution, the amount of lithium carbonate is the same as the total amount of metal ions, react for 8h, filter, wash, and dry to obtain t...

Embodiment 2

[0062]The present embodiment provides a kind of preparation method of lithium-ion battery lithium-rich manganese cathode material, and this material is Li 2 TiO 3 Coated 0.3Li 2 MnO 3 0.7LiNi 0.47 mn 0.47 al 0.06 o 2 Material, Li 2 TiO 3 Accounting for 0.3% of the total mass of lithium-rich manganese. It includes the following steps.

[0063] Step 1. Preparation of Precursor

[0064] According to 0.3Li 2 MnO 3 0.7LiNi 0.47 mn 0.47 al 0.06 o 2 In the chemical formula, the stoichiometric ratio of Ni, Mn, and Al is weighed to form a uniform mixed aqueous solution of nickel nitrate, manganese nitrate, and aluminum nitrate. The total concentration of metal ions is 2.0mol / L. The temperature of the solution is controlled at a constant temperature of 65°C. Under stirring, Add the precipitating agent lithium carbonate to the mixed solution, the amount of lithium carbonate is the same as the total amount of metal ions, react for 15h, filter, wash and dry to obtain the ni...

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
Particle sizeaaaaaaaaaa
Tap densityaaaaaaaaaa
Particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to a lithium and manganese-rich cathode material of a lithium ion battery and a preparation method of the cathode material. The lithium and manganese-rich cathode material is a Li2TiO3-coated xLi2MnO3.(1-x)LiNi[0.5-a / 2]Mn[0.5-a / 2]AlaO2 (wherein x is not less than 0.1 and not more than 0.9 and a is not less than 0.002 and not more than 0.1) material. The preparation method comprises the following steps: preparing a nickel manganese aluminum compound carbonate precursor by a coprecipitation method, sintering at the high temperature to obtain spherical or quasi-spherical nickel manganese aluminum compound oxide, adding into a solvent, uniformly dispersing, adding tetrabutyl titanate, hydrolyzing to obtain a nickel manganese aluminum titanium compound, mixing with a lithium compound, and calcining to obtain the lithium and manganese-rich cathode material. The lithium and manganese-rich cathode material prepared by the method is high in first coulombic efficiency, good in circulation stability and high in rate performance.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a lithium-ion battery lithium-rich manganese cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in mobile phones, notebook computers, electric vehicles and other fields due to their high energy density, high operating voltage, and good cycle performance. With the expansion of the application field of lithium-ion batteries, higher requirements are put forward for the cathode materials of lithium-ion batteries, such as higher energy density, low price, excellent cycle life, higher rate performance, etc. Layered lithium-rich manganese cathode material xLi 2 MnO 3 ·(1-x)LiMO 2 (M=Mn, Ni, Co, Ni 0.5 mn 0.5 , Cr, Ni 1 / 3 co 1 / 3 mn 1 / 3 , Fe...) is a kind of α-NaFeO 2 type solid solution material, composed of layered Li 2 MnO 3 and LiMO 2 (M=Mn, Ni, Co, Ni 0.5 mn 0.5 , Cr, Ni 1 / 3 co 1 / 3 mn 1 / 3...

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
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 刘三兵梅周盛
Owner CHERY AUTOMOBILE CO LTD
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