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

Preparation method of lithium manganese phosphate for lithium ion power battery

A power battery, lithium manganese phosphate technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of low production capacity, high process cost, large primary particles, etc. Improved diffusion coefficient and stable cycle performance

Active Publication Date: 2018-06-19
TIANJIN B&M SCI & TECH
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lithium manganese phosphate material prepared by the high-temperature solid-state method has large primary particles and poor conductivity; the solvothermal method has a very low production capacity, requires high-pressure equipment, and has high process costs.

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
  • Preparation method of lithium manganese phosphate for lithium ion power battery
  • Preparation method of lithium manganese phosphate for lithium ion power battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] First prepare 0.1mol·dm -3 Ti(SO 4 ) 2 solution and 10mol·dm -3 H 3 PO 4 The solution is ready for use. Add ethanol 20dm to the normal pressure reactor 3 , with a concentration of 50wt.% Mn(NO 3 ) 2 Solution 5dm 3 , the temperature is set at 35°C; at 1dm 3 min -1 Inject H into the reactor 3 PO 4 Solution, stop after 5min, let stand for 5min and then use 0.1dm 3 min -1 Inject Ti(SO 4 ) 2 Solution, stop after 10min; react for 12h and centrifuge to obtain solids, wash the solids 5 times, dry to obtain the precursor; measure the manganese content and titanium content of the precursor, mix with ammonium dihydrogen phosphate, lithium carbonate and acetylene black ball mill , so that n(PO 4 3- )=n(Ti 4+ ) / 6, n(Li + )=1.05*(n(Mn 2+ )+0.5*n(Ti 4+ )), acetylene black is 10% of the mass sum of the precursor, ammonium dihydrogen phosphate, lithium carbonate and acetylene black; the homogeneous mixture obtained is heat-treated for 5h at 550°C under nitrogen pro...

Embodiment 2

[0025] First prepare 0.5mol·dm -3 Ti(SO 4 ) 2 solution and mol dm of 12 -3 h 3 PO 4 solution. Add ethanol 50dm to the normal pressure reactor 3 , with a concentration of 50wt.% Mn(NO 3 ) 2 Solution 10dm 3 , the temperature is set at 45°C; at 1dm 3 min -1 Inject H into the reactor 3 PO 4 Solution, stop after 10min, let stand for 10min; then use 0.1dm 3 min -1 Inject Ti(SO 4 ) 2 The solution was stopped after 20 minutes, and the solid was obtained by centrifugation after 8 hours of reaction. The solid was washed 5 times and dried to obtain a precursor. Determination of the manganese content and titanium content of the precursor, mixed with ammonium phosphate, lithium acetate and sucrose ball milling, so that n(PO 4 3- )=n(Ti 4+ ) / 6, n(Li + )=1.05*(n(Mn 2+ )+0.5*n(Ti 4+ )), sucrose is 30% of the mass sum of the precursor, ammonium phosphate, lithium acetate and sucrose. The homogeneous mixture obtained is heat-treated at 500° C. for 4 hours under nitrogen p...

Embodiment 3

[0028] First prepare 0.3mol·dm -3 Ti(NO 3 ) 4 solution and 12mol·dm -3 H 3 PO 4 The solution is ready for use. Add ethanol 50dm to the normal pressure reactor 3 , with a concentration of 50wt.% Mn(NO 3 ) 2 Solution 10dm 3 , the temperature is set at 45°C; at 1dm 3 min -1 Inject H into the reactor 3 PO 4 Solution, stop after 10min, let stand for 8min and then use 0.1dm3 min -1 Inject Ti(NO 3 ) 4 solution, stop after 20min. After reacting for 8 hours, centrifuge to obtain the solid, wash the solid for 5 times, and dry to obtain the precursor. Determination of manganese content and titanium content of the precursor, mixed with lithium dihydrogen phosphate, lithium hydroxide and citric acid ball mill, so that n(PO 4 3- )=n(Ti 4+ ) / 6, n(Li + )=1.05*(n(Mn 2+ )+0.5*n(Ti 4+ )), the quality of citric acid is 40% of the four mass sum of precursor, lithium dihydrogen phosphate, lithium hydroxide and citric acid. The homogeneous mixture obtained is heat-treated at 5...

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 preparation method for lithium manganese phosphate used for lithium-ion power battery. The method comprises the following steps: 1) repectively preparing a titanium-ion solution and a phosphoric acid solution for subsequent usage; 2) with ethyl alcohol as a reaction medium, carrying out adding into a normal-pressure reactor, and adding a manganese nitrate solution at the same time; 3) gradually adding the phosphoric acid solution obtained in the step 1) into the normal-pressure reactor, then carrying out standing, and gradually adding the titanium-ion solution and then carrying out reaction; 4) after the reaction is completed, carrying out filtering separation so as to obtain a solid matter, and washing and drying the solid matter; 5) subjecting the solid matter obtained in the step 4) to mixing and ball milling with a lithium-contained raw material and a phosphate-contained raw material or a carbon-contained raw material; and 6) subjecting the mixture obtained in the step 5) to heat treatment in a protective atmosphere so as to obtain the lithium manganese phosphate used for the lithium-ion power battery. The preparation method provided by the invention is simple; and the obtained lithium manganese phosphate has good conductive performance, excellent rate capability and stable cycle performance.

Description

technical field [0001] The invention relates to a preparation method of a cathode material for a lithium ion battery, in particular to a preparation method of lithium manganese phosphate 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. Lithium-ion batteries are widely used in small devices such as mobile phones and notebook computers. At the same time, with the rapid development of industries such as electric vehicles and smart grids, the demand for lithium-ion power batteries has risen sharply, and the performance requirements for them are increasing. The cathode material used in lithium-ion batteries is the decisive factor for its performance and cost. As a cathode material for lithium-ion batteries, lithium manganese phosphate has the advantages of high working voltage, stable discharge, low cost, and good ...

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): C01B25/45H01M4/58
CPCY02E60/10
Inventor 徐宁赵明宋英杰吴孟涛
Owner TIANJIN B&M SCI & TECH