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Glass coated stable lithium manganate battery electrode material and preparation method

A lithium manganate battery and electrode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of the structure change of spinel lithium manganate, the effect of the modification method is not obvious, and the reversibility is poor, and the reaction conditions are met. Easy control, improved rate performance, uniform thickness effect

Active Publication Date: 2017-06-23
钱陈
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a glass-coated stable lithium manganese oxide battery electrode material, aiming at solving the defects that spinel lithium manganate is prone to structural changes and poor reversibility at high temperatures and other modification methods are not effective. Obvious issues that lead to improved high-rate performance of the material

Method used

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  • Glass coated stable lithium manganate battery electrode material and preparation method
  • Glass coated stable lithium manganate battery electrode material and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Weigh the chemical manganese dioxide (CMD) and lithium carbonate according to the ratio of 1:1.8, and put them into the ball mill tank for high-energy ball milling. The volume ratio of ball to material is 5:1, the milling time is 48 hours, and the particle size after ball milling is 0.1μm. , Discharging and vacuum drying to obtain lithium manganate precursor.

[0035] 2. Put the lithium manganate precursor into the sagger and enter the kiln for sintering. The sintering temperature is 660°C and the sintering time is 2h. After sintering, cooling and jet pulverization, the primary sintered material is obtained. The primary sintered material is sintered for the second time. The sintering process is pre-sintering at 500°C for 10h and 800°C for 25h. Air is introduced during the sintering process, after sintering, cooling, airflow crushing and sieving to obtain lithium manganate powder material.

[0036] 3. Dissolve battery-grade lithium hydroxide in deionized water to prepare a...

Embodiment 2

[0039] 1. Weigh electrolytic manganese dioxide (EMD) and lithium hydroxide according to a ratio of 1:1.9, put them into a ball mill tank for high-energy ball milling, the volume ratio of ball to material is 10:1, the milling time is 24 hours, and the particle size after ball milling is 1 μm , Discharging and spray drying to obtain lithium manganate precursor.

[0040] 2. Put the lithium manganate precursor into the sagger and enter the kiln for sintering. The sintering temperature is 540°C, and the sintering time is 6h. After sintering, cooling and jet pulverization, the primary sintered material is obtained. The primary sintered material is sintered for a second time. The sintering process is pre-sintering at 600°C for 4 hours and sintering at 900°C for 15 hours. Air is introduced during the sintering process, after sintering, cooling, airflow crushing and sieving to obtain lithium manganate powder material.

[0041] 3. Dissolve battery-grade lithium hydroxide in deionized water t...

Embodiment 3

[0044] 1. Weigh manganese hydroxide and lithium oxalate in a ratio of 1:2, put them into a ball mill tank for high-energy ball milling. The volume ratio of ball to material is 10:1, the milling time is 2 hours, and the particle size after ball milling is 0.8μm. The lithium manganate precursor is obtained by spray drying.

[0045] 2. Put the lithium manganate precursor into the sagger and enter the kiln for sintering. The sintering temperature is 480°C and the sintering time is 12h. After sintering, cooling and jet pulverization, the primary sintered material is obtained. The primary sintered material is sintered for a second time. The sintering process is pre-sintering at 700°C for 4 hours and 1000°C for 5 hours. Air is introduced during the sintering process, after sintering, cooling, airflow crushing and sieving to obtain lithium manganate powder material.

[0046] 3. Dissolve battery-grade lithium hydroxide in deionized water to prepare a battery-grade lithium hydroxide solution...

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Abstract

The invention provides a glass coated stable lithium manganate battery electrode material and aims to solve the problem that existing spinel lithium manganate is easy to change in structure at a high temperature and is poor in reversibility and other modification methods are not obvious in effect. The high-rate capability of the material is improved. According to the technical scheme, a preparation method comprises the following steps: preparing spinel lithium manganate powder by a two-step sintering process; then preparing a lithium silicate sol solution; mixing the spinel lithium manganate powder into the lithium silicate solution; dispersing the powder into spheres and then forming a gel; and then sintering the gel in a high-temperature sintering furnace, quickly cooling and crushing the gel to obtain the high-temperature stable lithium manganate battery electrode material coated with lithium silicate glass on the surface.

Description

Technical field [0001] The invention belongs to the field of lithium ion batteries and energy materials, and specifically relates to a high-temperature stable lithium manganate battery electrode material. Background technique [0002] As countries around the world are leaning toward new energy battery industry policies, lithium-ion power batteries, as an ideal energy source for development in the 21st century, have attracted more and more attention. With the strict control of carbon emissions, the automobile industry has replaced traditional energy sources with power sources, making the application of lithium-ion batteries play a pivotal role. [0003] The production of lithium-ion power batteries must select cathode materials. In theory, there are a wide variety of cathode materials that can be selected, but currently there are few lithium-ion cathode materials that can be used for commercial production purposes. In summary, there are only lithium iron phosphate, lithium manganat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/131H01M4/1391
CPCH01M4/131H01M4/1391H01M4/505Y02E60/10
Inventor 陈庆王镭迪曾军堂
Owner 钱陈
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