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

Lithium manganate positive electrode material and preparation method thereof

A positive electrode material, lithium manganate technology, applied in the field of lithium manganate positive electrode material and its preparation, can solve the problems of poor cycle performance, poor consistency of spinel-type lithium manganate crystal structure, low high temperature performance, etc., to achieve cost Low, improve electron conductivity, improve the effect of cycle performance

Active Publication Date: 2018-07-20
陕西天焱能源科技有限公司
View PDF1 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Spinel-type lithium manganate has a spinel structure, and the chemical formula of stoichiometric lithium manganate is LiMn 2 o 4 , belongs to the cubic crystal system. For spinel lithium manganate, it is mainly prepared by solid-phase synthesis in industry, but during the calcination process, the internal precursor is difficult to complete the reaction due to insufficient oxygen, which eventually leads to calcination. The resulting spinel-type lithium manganese oxide has poor crystal structure consistency, coupled with the dissolution of manganese and the transformation of the crystal structure during the cycle, the battery capacity decays quickly, the cycle performance is poor, and the high-temperature performance is low.

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 manganate positive electrode material and preparation method thereof
  • Lithium manganate positive electrode material and preparation method thereof
  • Lithium manganate positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: Step 1, take the following raw materials:

[0036] Lithium carbonate 0.743g, manganese dioxide 3.792g, lithium phosphate 0.116g, aluminum fluoride 0.0336g, and sucrose 1.2848g;

[0037] Step 2, add all the raw materials weighed in step 1 into the ball milling tank, the ball milling time is 1h, the ball milling speed is 1200r / min, and the mixed raw material A is obtained; wherein, the ball mill model is QM-3C high-speed vibration ball mill, and the ball milling tank is 50mL zirconia tank;

[0038] Step 3. Put the mixed raw material A prepared in step 2 into a muffle furnace for sintering, the sintering atmosphere is air, and the sintering conditions are: pre-firing temperature 540°C, heat preservation for 6 hours, then raise the temperature to 800°C, heat preservation for 10 hours, wherein, heat up The speed is 5°C / min, and the sintered product B is obtained;

[0039] Step 4. Grinding the sintered product B obtained in step 3, grinding with anhydrous etha...

Embodiment 2

[0046] Step 1. Weigh the following raw materials:

[0047] Lithium carbonate 1.2g, manganese dioxide 6.2g, lithium phosphate 0.19g, aluminum fluoride 0.14g, and sucrose 2.27g;

[0048] Step 2, add all the raw materials weighed in step 1 into the ball milling tank, the ball milling time is 2h, the ball milling speed is 1200r / min, and the mixed raw material A is obtained; wherein, the ball mill model is QM-3C high-speed vibration ball mill, and the ball milling tank is 50mL zirconia tank;

[0049] Step 3. Put the mixed raw material A prepared in step 2 into a muffle furnace for sintering, the sintering atmosphere is air, and the sintering conditions are: pre-sintering temperature 600°C, heat preservation for 4 hours, then raise the temperature to 850°C, heat preservation for 12 hours, wherein, heat up The rate is 10°C / min, and the sintered product B is obtained;

[0050] Step 4. Grinding the sintered product B obtained in step 3, grinding with anhydrous ethanol medium, adding 5....

Embodiment 3

[0052] Step 1. Weigh the following raw materials:

[0053] Lithium carbonate 1.76g, manganese dioxide 7.9g, lithium phosphate 0.25g, aluminum fluoride 0.05g;

[0054] Step 2, add all the raw materials weighed in step 1 into the ball milling tank, the ball milling time is 1.5h, and the ball milling speed is 1200r / min, to obtain the mixed raw material A; wherein, the ball mill model is QM-3C high-speed vibration ball mill, and the ball milling tank is 50mL zirconia tank;

[0055] Step 3. Put the mixed raw material A prepared in step 2 into a muffle furnace for sintering, the sintering atmosphere is air, and the sintering conditions are: pre-firing temperature 580°C, heat preservation for 5 hours, then raise the temperature to 830°C, heat preservation for 11 hours, wherein, the temperature rise The speed is 8°C / min, and the sintered product B is obtained;

[0056] Step 4. Grinding the sintered product B obtained in step 3, grinding with anhydrous ethanol medium, adding 5.0% sod...

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 lithium manganate positive electrode material and a preparation method thereof. The lithium manganate positive electrode material is prepared from lithium carbonate, manganese dioxide, lithium phosphate, aluminum fluoride and sucrose; in preparation of spinel type lithium manganate, the surfaces of lithium manganate particles are coated with a layer of lithium phosphate,and the lithium manganate body phase is doped with a fluorine element and an aluminum element, thereby effectively improving structural stability of lithium manganate in a cyclic process, suppressingmanganese dissolution and protecting an electrode material from corrosion of hydrofluoric acid in an electrolyte, and effectively improving the initial coulombic efficiency and cycle performance of alithium manganate battery; and simple preparation method, low cost and easy industrialization are achieved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery preparation, and in particular relates to a lithium manganate cathode material and a preparation method thereof. Background technique [0002] With the development of technology, lithium-ion batteries have very good application prospects in the fields of electric vehicles and energy storage, and will have a profound impact on people's lives in the future. [0003] The most widely used cathode material for lithium-ion batteries in commercial use is LiCoO 2 , but LiCoO 2 Poor safety, unfriendly to the environment, and because the abundance of cobalt in the earth's crust is only 25ppm, resulting in LiCoO 2 expensive. [0004] Due to its cheap price, environmental friendliness and good safety, spinel-type lithium manganate is regarded as one of the most promising cathode materials. Spinel-type lithium manganate has a spinel structure, and the chemical formula of stoichiometric lithium ...

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): H01M4/36H01M4/505H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/626H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 付强徐丹军
Owner 陕西天焱能源科技有限公司