Preparation method capable of increasing electrochemical performance of magnesium-sodium-doped lithium permanganate anode material

A positive electrode material, lithium manganate technology, which is applied in the field of preparation of magnesium and sodium double doping to improve the electrochemical performance of lithium manganate positive electrode material, can solve the problem of three-dimensional diffusion channel blockage of lithium ions, and achieve excellent cycle stability, Broad application prospects and the effect of improving electrochemical performance

Inactive Publication Date: 2017-02-22
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Description
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  • Application Information

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Problems solved by technology

However, the Jahn-Teller effect still exists, and the three-dim

Method used

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  • Preparation method capable of increasing electrochemical performance of magnesium-sodium-doped lithium permanganate anode material
  • Preparation method capable of increasing electrochemical performance of magnesium-sodium-doped lithium permanganate anode material
  • Preparation method capable of increasing electrochemical performance of magnesium-sodium-doped lithium permanganate anode material

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Example Embodiment

[0024] Example 1:

[0025] (1) Dissolve 0.0357 mol of manganese sulfate monohydrate in 250 mL of deionized water, and then add 25 mL of absolute ethanol dropwise.

[0026] (2) Dissolve 0.357 mol of ammonium bicarbonate in 250 mL of deionized water.

[0027] (3) The solution obtained in step (2) was slowly added dropwise to the solution obtained in step (1) in 3 times to obtain a milky white suspension, which was stirred at 35°C for 1 hour with a DF-101S heat-collecting magnetic stirrer. After 3 hours, a pale pink precipitate is obtained; the pale pink precipitate is suction filtered, washed, and sent to a vacuum drying oven at 40°C for 8 hours to obtain a pale pink manganese carbonate powder.

[0028] (4) Put the light pink manganese carbonate powder obtained in step (3) in a muffle furnace at 300°C for pre-sintering for 2 hours. After pre-sintering, wash with hydrochloric acid with a concentration of 0.1 mol / L for 2 days, filter and wash with suction, It was sent to 100°C for vacuum...

Example Embodiment

[0032] Example 2:

[0033] (1) Dissolve 0.0357 mol of manganese sulfate monohydrate in 250 mL of deionized water, and then add 25 mL of absolute ethanol dropwise.

[0034] (2) Dissolve 0.357 mol of ammonium bicarbonate in 250 mL of deionized water.

[0035] (3) The solution obtained in step (2) was slowly added dropwise to the solution obtained in step (1) in 3 times to obtain a milky white suspension, which was stirred at 35°C for 1 hour with a DF-101S heat-collecting magnetic stirrer. After 3 hours, a pale pink precipitate is obtained; the pale pink precipitate is suction filtered, washed, and sent to a vacuum drying oven at 40°C for 8 hours to obtain a pale pink manganese carbonate powder.

[0036] (4) Put the light pink manganese carbonate powder obtained in step (3) in a muffle furnace at 300°C for pre-sintering for 2 hours. After pre-sintering, wash with hydrochloric acid with a concentration of 0.1 mol / L for 2 days, filter and wash with suction, It was sent to 100°C for vacuum...

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Abstract

The invention discloses a preparation method capable of increasing the electrochemical performance of a magnesium-sodium-doped lithium permanganate anode material. The preparation method includes the steps of firstly, dissolving manganese sulfate monohydrate into deionized water, and dropwise adding anhydrous ethanol; secondly, dissolving ammonium bicarbonate into deionized water; thirdly, mixing the obtained solutions, stirring, aging, performing precipitation and suction filtration, washing, and drying to obtain manganese carbonate; fourthly, pre-sintering the manganese carbonate, washing with hydrochloric acid, performing suction filtration, washing, and drying to obtain manganese dioxide; fifthly, grinding a lithium source, the manganese dioxide, a magnesium ion doping source and a sodium ion doping source, sintering, and cooling to obtain the magnesium-sodium-doped lithium permanganate anode material Li1-xNaxMgyMn2-yO4, wherein x=0.01-0.2, and y=0.01-0.2. The preparation method has the advantages that the method is simple in process, environmentally friendly, low in cost and capable of preparing the well-crystallized magnesium-sodium-doped lithium permanganate anode material even in distribution, and the electrochemical performance of the material is increased evidently.

Description

technical field [0001] The invention relates to a preparation method for improving the electrochemical performance of a lithium manganate cathode material by doping magnesium and sodium. Background technique [0002] In recent years, people have paid more and more attention to the development and application of new energy and new materials, so as to drive the development of various portable electronic product industries and electric vehicle industries. Due to the advantages of high specific energy, good safety, long cycle life, green and pollution-free, lithium-ion secondary batteries have attracted attention from all over the world. Today, the research and development of cathode materials for lithium-ion batteries is one of the key factors restricting the development of lithium-ion power batteries. Due to the lithium manganese oxide cathode material battery has outstanding advantages such as high working voltage, good cycle performance, long service life, low cost, environ...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M10/0525
CPCH01M4/505H01M10/0525Y02E60/10
Inventor 肖顺华毛雁芳
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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