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A kind of preparation method of polyhedral quasi-spherical aluminum-doped spinel type lithium manganese oxide

A type of lithium manganate and aluminum spinel technology, which is applied in the field of inorganic non-metallic functional materials, can solve the problem of complex process steps, product specific capacity, rate performance and cycle stability that cannot meet power batteries, and restrict the scale of lithium manganate Production and other issues

Active Publication Date: 2020-01-21
YUNNAN MINZU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] The process steps of the above method are complicated, and the sintering temperature is too harsh, and the holding time is too long, which restricts the large-scale production of lithium manganate
Alternatively, although the method has simple process steps, the specific capacity, rate performance and cycle stability of the product cannot meet the needs of power batteries

Method used

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  • A kind of preparation method of polyhedral quasi-spherical aluminum-doped spinel type lithium manganese oxide
  • A kind of preparation method of polyhedral quasi-spherical aluminum-doped spinel type lithium manganese oxide
  • A kind of preparation method of polyhedral quasi-spherical aluminum-doped spinel type lithium manganese oxide

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Embodiment 1

[0036] Accurately weigh lithium nitrate (LiNO 3 ) 1.1527 g, manganese acetate (Mn(CH 3 COO) 2 4H 2 O) 7.9912 g and aluminum nitrate (Al(NO 3 ) 3 9H 2 (0) 0.3136 g in a beaker, add 10 mL of distilled water into the beaker, heat and stir at a constant temperature at 50°C to form a uniform mixed solution, add 5 mL of 9 mol / L nitric acid solution dropwise under constant temperature stirring, to form a light red mixed solution , keep warm for 10min. Heat and stir the solution at a constant temperature of 100° C. to evaporate one-fifth of the total volume of the solution, and then transfer the mixed solution to a porcelain crucible. Move the porcelain crucible to a temperature-programmed box-type resistance furnace at 150°C, heat it for 5 minutes in an air atmosphere, then raise the temperature to 400°C at a rate of 20°C / min, heat and burn for 30 minutes in an air atmosphere, and finally heat it at 20°C / min. Raise the temperature to 500°C for 1 hour at a rate of 1 min, take i...

Embodiment 2

[0038] Accurately weigh lithium nitrate (LiNO 3 ) 1.1618 g, manganese acetate (Mn(CH 3 COO) 2 4H 2 O) 7.8474 g and aluminum nitrate (Al(NO 3 ) 3 9H 2 (0) 0.6322 g in a beaker, add 10 mL of distilled water into the beaker, heat and stir at a constant temperature at 50°C to form a uniform mixed solution, add 5 mL of 6 mol / L nitric acid solution dropwise under constant temperature stirring, to form a light red mixed solution , keep warm for 10min. Heat and stir the solution at a constant temperature of 100° C. to evaporate one-fifth of the total volume of the solution, and then transfer the mixed solution to a porcelain crucible. Move the porcelain crucible to a temperature-programmed box-type resistance furnace at 150°C, heat it for 5 minutes in an air atmosphere, then raise the temperature to 400°C at a rate of 20°C / min, heat and burn for 30 minutes in an air atmosphere, and finally heat it at 20°C / min. Raise the temperature to 500°C for 1 hour at a rate of 1 min, take i...

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Abstract

The invention discloses a preparation method for polyhedral spheroidic aluminum-doped spinel lithium manganate. The method comprises the following steps: accurately weighing a lithium salt, a manganese salt and an aluminum salt according to a mol ratio of lithium ions, manganese ions and aluminum ions of 1: (2-x): x as described in a molecular formula LiAl<x>Mn<2-x>O<4> (wherein x is equal to 0.05, 0.10, 0.15 or 0.20), carrying out dissolving with a proper amount of distilled water at 50 DEG C under stirring, then adding an oxidizing agent drop by drop and carrying out heat preservation for 5 to 15 min; evaporating a solution obtained in the previous step at 100 DEG C until a certain volume of water is left and then transferring the solution to a porcelain crucible; placing the porcelain crucible in a temperature-programmed chamber electric resistance furnace with a temperature of 150 DEG C, carrying out heating at the temperature for 5 min, then carrying out a combustion reaction at 400 DEG C for 30 to 60 min, maintaining a reaction product at 500 DEG C for 1 to 2 h and then successively carrying out cooling and grinding so as to obtain powder; and maintaining the powder at 600 to 700 DEG C for 3 to 6 h and then carrying out grinding again so as to obtain finished polyhedral spheroidic aluminum-doped spinel lithium manganate. The polyhedral spheroidic aluminum-doped spinel lithium manganate prepared in the invention has polyhedral spheroidic morphology, submicron and uniform particle size, and excellent specific capacity, cycling stability and rate performance at normal temperature and high temperature. The preparation method is simple in process and low in cost.

Description

technical field [0001] The invention relates to a preparation method of a lithium-ion battery positive electrode material, in particular to a polyhedral spherical aluminum-doped spinel-type lithium manganate positive electrode material and a preparation method thereof, which belong to the technical field of inorganic non-metallic functional materials. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles, hybrid electric vehicles, and portable electronic devices due to their high energy, high power density, no memory effect, and good safety performance, thus dominating the energy supply market. [0003] Spinel-type lithium manganese oxide has a unique three-dimensional space structure for the rapid migration of lithium ions, and it has the advantages of low toxicity, low consumption, high safety, and environmental friendliness. It is most likely to replace commercial lithium cobalt oxide and become a new generation of relatively Promising c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/505H01M10/0525
CPCH01M4/364H01M4/463H01M4/505H01M10/0525Y02E60/10
Inventor 郭俊明刘金涛于月白红丽苏长伟刘晓芳白玮段开娇
Owner YUNNAN MINZU UNIV