Method for preparing anode material of metal oxide nano-sheet lithium ion battery

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, nickel oxide/nickel hydroxide, circuits, etc., can solve the problems of high equipment requirements and low output, and achieve simple preparation process, low difficulty, and broad application prospects Effect

Active Publication Date: 2009-11-18
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the current lithium-ion battery nanosheet cathode materials are synthesized by hydrothermal method (referring to literature: Journal of Physical Chemistry C, 2007, 111 (7): 3192-3196; Nanotechnology, 2009, 20 (11): 115608), this This method has relatively high requirements on equipment, and the output is relatively low when mass production is carried out, and the performance of the obtained nanosheets needs to be further improved. Therefore, it is important to find a more convenient and quick method to prepare nanosheet cathode materials with better performance. significance

Method used

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  • Method for preparing anode material of metal oxide nano-sheet lithium ion battery

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Embodiment 1

[0026] Firstly, cobalt acetate and lithium acetate were formulated into solutions according to the stoichiometric ratio of 1:1.05, then lithium acetate and oxalic acid were added dropwise to the cobalt acetate solution at the same time, and acetic acid was added to make the acetic acid excessive, and the pH was adjusted to 3.5; the temperature was raised to 80 ℃ and stirring, the stirring speed is 500rpm, so that the solution phase forms a rheological phase, continue stirring for 24h, and then let the solution dry up. The precursor powder is pre-calcined in a high-temperature resistance furnace at a temperature of 400°C for a calcination time of 5 hours; the product is taken out for grinding and then sintered at a high temperature at a sintering temperature of 800°C for a calcination time of 8 hours to finally obtain a layered lithium cobalt oxygen nanometer piece.

[0027] The scanning electron microscope image of layered lithium cobalt oxide nanosheets is shown in figure 1 ...

Embodiment 2

[0030] Firstly, manganese acetate, nickel acetate and lithium acetate were formulated into solutions according to 0.58:0.25:1.29, and the nickel acetate and manganese acetate solutions were mixed thoroughly, then lithium acetate and oxalic acid were added dropwise to the mixed solution at the same time, and acetic acid was added to make the acetic acid Excessive, adjust the pH to 4; raise the temperature to 80°C and stir the solution phase until the rheological phase is formed, continue stirring for 48h, and then let the solution dry up. The precursor powder was pre-calcined in a high-temperature resistance furnace at a temperature of 400°C for 5 hours; the product was taken out for grinding and then sintered at a high temperature at a temperature of 900°C for 12 hours to obtain Li(Li 0.17 Ni 0.25 mn 0.58 )O 2 Layered LiNiMnO nanosheets.

[0031] The selected area electron diffraction pattern of layered lithium nickel manganese oxide nanosheets is shown in image 3 . ima...

Embodiment 3

[0036] Firstly, manganese acetate, nickel acetate, cobalt acetate and lithium acetate were formulated into solutions at 0.5:0.17:0.17:1.29, and the nickel acetate, cobalt acetate and manganese acetate solutions were mixed thoroughly, then lithium acetate and oxalic acid were added dropwise to the mixed solution at the same time and add acetic acid to make excess acetic acid, adjust the pH to 4; raise the temperature to 80°C and stir the solution phase until the rheological phase is formed, continue stirring for 72h, and then let the solution dry up. The precursor powder was pre-calcined in a high-temperature resistance furnace at a temperature of 400°C for 5 hours; the product was taken out for grinding and then sintered at a high temperature at a temperature of 900°C for 12 hours to obtain Li(Li 0.17 Ni 0.17 co 0.17 mn 0.5 )O 2 Layered lithium nickel cobalt manganese oxide nanosheets.

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Abstract

A method for preparing an anode material of a metal oxide nano-sheet lithium ion battery relates to a metal oxide nano-sheet, in particular to a metal oxide nano-sheet applicable to the anode material of the lithium ion battery and a preparation method thereof. The invention provides a method for preparing the anode material of the metal oxide nano-sheet lithium ion battery, wherein the anode material has higher specific capability, better rate capability and longer cycle life. The method comprises the following steps of: preparing a solution A from soluble cobalt salt, soluble nickel salt or soluble manganese salt; dissolving a soluble lithium salt into water and adding a precipitant in the water, thus obtaining a solution B; adding the solution B in the solution A in a mixing state; subsequently adding an organic acid into the solution and stirring the solution, thus obtaining a mixture; stirring the mixture to be dry and obtaining a precursor powder; pre-calcining the obtained precursor powder; and taking out the pre-calcined precursor powder, grinding and sintering the pre-calcined precursor powder, thus obtaining the anode material of the metal oxide nano-sheet lithium ion battery.

Description

technical field [0001] The invention relates to a class of metal oxide nanosheets, in particular to a metal oxide nanosheet suitable for lithium-ion battery cathode materials and a preparation method thereof. Background technique [0002] Due to the advantages of high output voltage, large specific energy, long cycle life, low pollution, small size, and light weight, lithium-ion batteries have been a hot spot in the field of energy materials research and social attention in the past 20 years. How to improve the charge and discharge rate and capacity of lithium-ion batteries and maintain a certain cycle life, the development of new electrode materials is a key issue. [0003] At present, among the cathode materials of commercialized lithium-ion batteries, lithium iron phosphate has the fastest charge and discharge rate and the best rate performance. Due to its good cycle performance, good safety and excellent fast charge-discharge performance, this material has been attracti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/48H01M4/50H01M4/52C01G53/04
CPCY02E60/12Y02E60/10
Inventor 孙世刚魏国祯黄令
Owner XIAMEN UNIV
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