High performance lithium ion battery anode material lithium manganate and preparation method thereof

A lithium-ion battery, material lithium manganese oxide technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve problems such as not suitable for large-scale production, fast capacity decay, and inability to meet higher and higher requirements, and achieve suppression Effect of John-Teller effect, high structure and electrical properties, and excellent charge-discharge cycle performance

Inactive Publication Date: 2011-09-21
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the specific capacity of the spinel lithium manganese oxide material is low, and its performance is unstable at high temperature, and the dissolution of manganese caused by the presence of HF in the electrolyte causes the capacity of lithium manganate to decay rapidly, and at the same time, the problems such as rapid capacity decay
The above problems have greatly limited its application in actual lithium-ion batteries, and have become the key to whether lithium manganate can be applied on a large scale, especially in high-current charge-discharge batteries.
[0004] Although many researchers have done a lot of work, active research and development has adopted the sol-gel method (C.J.Curtis, J.X.Wang, D.L.Schulz, J.Electrochem.Soc.151(2004)A590.), hard template method (J

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation chemical formula is LiMn 1.97 Cr 0.03 o 4 Lithium manganese oxide cathode material. Weigh lithium carbonate, chromium oxide and electrolytic manganese dioxide according to the stoichiometric ratio, and use zirconium balls as the medium and deionized water as the dispersant to carry out ball milling for 4 hours to make them evenly mixed, and then dry them in an air atmosphere at 120°C for 8 Hour. The dried mixture was heated to 400° C. at a rate of 1° C. / min in an air atmosphere and kept for 15 hours for calcination, and then naturally cooled to room temperature. The calcined product was ball milled again for 16 hours and dried in an air atmosphere of 120°C for 15 hours, and the dried mixture was heated to 700°C at a constant temperature of 2°C / min for calcination in an air atmosphere for 20 hours, and then Cool down to room temperature naturally.

[0023] The calcined product is the positive electrode active material of the lithium ion battery, acet...

Embodiment 2

[0025] The preparation chemical formula is LiMn 1.95 Cu 0.02 Al 0.02 Y 0.01 o 4Lithium manganese oxide cathode material. Weigh lithium carbonate, electrolytic manganese dioxide, copper oxide, aluminum hydroxide and yttrium oxide according to the stoichiometric ratio, use zirconium balls as the medium, and use absolute ethanol as the dispersant to carry out ball milling for 12 hours to make it evenly mixed, and then °C in an air atmosphere for 4 hours. The dried mixture was heated to 600° C. at a rate of 10° C. / min in an air atmosphere and kept for 4 hours for calcination, and then naturally cooled to room temperature. The calcined product was ball milled again for 3 hours and dried in an air atmosphere at 120°C for 8 hours, and the dried mixture was calcined at a constant temperature of 950°C for 5 hours at a rate of 1°C / min in an air atmosphere, and then naturally Bring to room temperature.

[0026] The calcined product is the positive electrode active material of the ...

Embodiment 3

[0028] The preparation chemical formula is LiMn 1.9 Zn 0.02 Ti 0.01 Mg 0.03 Si 0.03 Zr 0.01 o 4 Lithium manganese oxide cathode material. Lithium carbonate, electrolytic manganese dioxide, zinc oxide, titanium oxide, silicon oxide and zirconium oxide were weighed according to the stoichiometric ratio, and zirconium balls were used as a medium, and a mixture of deionized water and absolute ethanol was used as a dispersant for ball milling for 6 hours. It was mixed uniformly, and then dried in an air atmosphere at 120° C. for 10 hours. The dried mixture was heated to 450° C. at a heating rate of 2° C. / min in an air atmosphere and kept for 12 hours for calcination, and then naturally cooled to room temperature. The calcined product was ball milled again for 14 hours and dried in an air atmosphere of 120°C for 10 hours, and the dried mixture was heated to 850°C at a constant temperature of 11 hours at a rate of 10°C / min for calcination in an air atmosphere, and then Cool d...

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Abstract

The invention provides a high performance lithium ion battery anode material lithium manganate and a preparation method of the material. The lithium manganate is a doped lithium manganate LiMn2-yXy04 which is doped with one kind or a plurality of other metal elements X, wherein X element is at least one kind selected form the group of aluminium, lithium, fluorine, silver, copper, chromium, zinc, titanium, bismuth, germanium, gallium, zirconium, stannum, silicon, cobalt, nickel, vanadium, magnesium, calcium, strontium, barium and rare earth elements lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium, and y is larger than 0 but less than or equal to 0.11. The lithium ion battery anode material lithium manganate provided in the invention has extraordinary charge and discharge cycle performance both in the environments of normal temperature and high temperature. According to the invention, the preparation method of the material is a solid phase method, the operation is simple and controllable and the cost is low so that it is easy to realize large-scale productions.

Description

technical field [0001] The invention relates to a high-performance lithium ion battery positive electrode material lithium manganese oxide and a preparation method thereof, and belongs to the technical field of lithium ion battery positive electrode materials and its preparation. Background technique [0002] With the inclination of countries around the world to the new energy battery industry, lithium-ion power batteries, as an ideal energy source for the development of the 21st century, have attracted more and more attention. The composition of lithium-ion batteries includes electrode (positive and negative) materials, separators and electrolytes. Negative electrode materials are mainly graphite and solid carbon particles; between the positive and negative electrodes are battery electrolyte and separator; the positive electrode material is the core of lithium batteries and is an important factor that determines its electrochemical performance, safety performance and future...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/1391
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 谭强强徐宇兴
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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