Ruthenium dioxide coated spinel lithium-rich lithium manganate and preparation method thereof

A technology of lithium-rich lithium manganate and ruthenium dioxide is applied in the field of ruthenium dioxide coating spinel lithium-rich manganate and its preparation, which can solve the problem of poor crystallinity of lithium-rich lithium manganate and poor overall performance of the material. Ideal, poor cycle performance and other problems, to achieve the effect of improving high-temperature storage and cycle performance, high crystallinity, and low post-processing temperature

Active Publication Date: 2018-12-18
SHANGHAI ELECTRICGROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The actual technical problem to be solved by the present invention is to overcome the capacity attenuation and poor cycle performance of spinel lithium manganate in the prior art due to the dissolution of Mn and other side reactions during the circulation process, and the preparation of rich lithium by solid-phase sintering. Lithium manganate, the obtained lithium-rich lithium manganate has poor crystallinity, which leads to defects such as unsatisfactory overall performance of the material after coating. A ruthenium dioxide-coated spinel lithium-rich lithium manganate and a preparation method thereof are provided

Method used

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  • Ruthenium dioxide coated spinel lithium-rich lithium manganate and preparation method thereof
  • Ruthenium dioxide coated spinel lithium-rich lithium manganate and preparation method thereof
  • Ruthenium dioxide coated spinel lithium-rich lithium manganate and preparation method thereof

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Embodiment 1

[0040] Weigh 1g of manganese trioxide, add it to 50mL, 5mol / L NaOH solution, stir for 0.5h to obtain a uniformly mixed precursor solution, transfer the precursor solution into a microwave reactor, heat at 180°C for 6h, and wash the product with water , to a pH value of 7, and dried in an oven at 80°C. Mix the above product with 0.7g of lithium nitrate and 1.72g of potassium chloride, grind it evenly, react in molten salt at 480°C for 10 hours, wash the product with water until it is free of chlorine, and dry it to obtain spinel lithium-rich lithium manganese oxide. high magnification scanning electron microscope see figure 1 ,Depend on figure 1 It can be seen that the spinel lithium-rich lithium manganate octahedral crystal form obtained according to the above method is complete and the particle size is uniform; the X-ray diffraction diagram is shown in figure 2 ,Depend on figure 2 It can be seen that the spinel lithium-rich lithium manganese oxide prepared according to t...

Embodiment 2

[0044] Weigh 1g of manganese trioxide, add it to 50mL, 5mol / L NaOH solution, stir for 0.5h to obtain a uniformly mixed precursor solution, transfer the precursor solution into a microwave reactor, heat at 180°C for 6h, and wash the product with water , to a pH value of 7, and dried in an oven at 80°C. Mix the above product with 0.7g of lithium nitrate and 1.72g of potassium chloride, grind it evenly, react in molten salt at 480°C for 10 hours, wash the product with water until it is free of chlorine, and dry it to obtain spinel lithium-rich lithium manganese oxide.

[0045] Weigh the mass ratio of spinel lithium-rich lithium manganate: ruthenium chloride = 100:8.58, first dissolve ruthenium chloride in deionized water to make a solution, and evenly disperse the spinel lithium-rich lithium manganate in the chloride Ruthenium (RuCl 3 ) aqueous solution, stir at room temperature for 1-2h, add 1mol / L sodium hydroxide solution dropwise until the reaction is complete, continue to s...

Embodiment 3

[0047] Weigh 1g of manganese trioxide, add it to 50mL, 5mol / L NaOH solution, stir for 0.5h to obtain a uniformly mixed precursor solution, transfer the precursor solution into a microwave reactor, heat at 180°C for 6h, and wash the product with water , to a pH value of 7, and dried in an oven at 80°C. Mix the above product with 0.7g of lithium nitrate and 1.72g of potassium chloride, grind it evenly, react in molten salt at 480°C for 10 hours, wash the product with water until it is free of chlorine, and dry it to obtain spinel lithium-rich lithium manganese oxide.

[0048] Weigh the mass ratio of spinel lithium-rich lithium manganese oxide: ruthenium chloride = 100:15.6, first dissolve ruthenium chloride in deionized water to make a solution, and evenly disperse the spinel lithium-rich lithium manganate in the chloride Ruthenium (RuCl 3 ) aqueous solution, stir at room temperature for 1-2h, add 1mol / L sodium hydroxide solution dropwise until the reaction is complete, continu...

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Abstract

The invention discloses a ruthenium dioxide coated spinel lithium-rich manganate lithium and a preparation method thereof. The preparation method comprises the following steps: adding an aqueous solution of sodium hydroxide and manganese trioxide to 160 to 200 DEG C for microwave hydrothermal reaction to obtain a precursor; carrying out molten salt reaction of lithium nitrate, potassium chloride and the precursor at 450 to 500 DEG C to obtain spinel lithium manganate rich in lithium; dispersing spinel lithium-rich lithium manganate in an aqueous solution of ruthenium chloride and then adding the aqueous solution of sodium hydroxide, and making th obtained solid to react at 150 to 180 DEG C. The prepared ruthenium dioxide coated spinel lithium-rich manganate is coated with a layer of ruthenium dioxide on the surface of the lithium-rich manganate, on the one hand, RuO2 can increase the conduction of Li + and electrons on the surface; and on the other hand, RuO2 can avoid the direct contact between Li-rich lithium manganate and an electrolyte, thereby improving the stability of a crystal structure, and further improving the high-temperature storage and cycle performance of Li-rich lithium manganate.

Description

technical field [0001] The invention relates to a ruthenium dioxide-coated spinel lithium-rich lithium manganese oxide and a preparation method thereof. Background technique [0002] Due to its stable structure and three-dimensional fast lithium ion diffusion channels, spinel lithium manganate has excellent safety performance and fast charge and discharge capabilities. The field of power batteries is widely used, but it still has defects. Due to factors such as structural stability, Jahn-Teller effect, and manganese dissolution, the spinel lithium manganese oxide has the problem of capacity fading during the cycle. [0003] At present, the method of surface coating can be used to effectively prevent the dissolution of manganese and avoid the problem of Mn 3+ The part in contact with the electrolyte produces a disproportionation reaction, thereby improving the electrochemical performance of the material. However, patent CN105914366A discloses a preparation method of spinel ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M10/0525Y02E60/10
Inventor 周兰刘佳丽李旺万玲玉
Owner SHANGHAI ELECTRICGROUP CORP
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