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A preparation method of lithium nickel manganese oxide material with submicron octahedral structure

A technology of regular octahedron and lithium nickel manganese oxide, which is applied in the field of preparation of lithium nickel manganese oxide material with submicron octahedral structure, can solve the problem that the octahedral structure of lithium nickel manganese oxide material is not obvious, the degree of performance improvement is not obvious, and the method is cumbersome and other problems, to achieve the effect of obvious octahedral shape, cost-effective improvement, and strong operability

Active Publication Date: 2021-01-26
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention of patent No. CN201510542822.7 introduces a lithium nickel manganese oxide material with an octahedral structure synthesized by an amine complexing agent-assisted method. However, due to the problem of controlling the heating time in this method, the resulting nickel manganese The octahedral structure of the lithium acid material is not obvious, and there is still agglomeration
The invention of patent No. CN104538604A introduces a LNMO surface modification method of ultrasonic electroless nickel plating, but this method is too cumbersome, the degree of performance improvement is not obvious, and the cost performance is low, which is not enough to be an advantageous solution for modification

Method used

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  • A preparation method of lithium nickel manganese oxide material with submicron octahedral structure
  • A preparation method of lithium nickel manganese oxide material with submicron octahedral structure
  • A preparation method of lithium nickel manganese oxide material with submicron octahedral structure

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Embodiment 1

[0035] MnO 2 , Ni(NO 3 ) 2 ·6H 2 O and Li 2 CO 3 Prepared for raw materials. Manganese dioxide and Ni(NO 3 ) 2 ·6H 2 O and lithium carbonate are accurately weighed according to the ratio of stoichiometric ratio 3:1:1.05 (5% of lithium source is excessive to compensate for the loss at high temperature), and the manganese dioxide and Ni(NO 3 ) 2 ·6H 2 O is mixed and placed in a ball mill jar for ball milling. The ball milling speed is 400r / min, and the ball milling time is 3h. The manganese dioxide and Ni(NO 3 ) 2 ·6H 2 The mixture of O was dried into a powder in a forced air oven. The amount of weighing material is the oxalic acid powder of 2 (x+y+z) again, the above-mentioned oxalic acid powder is mixed with the manganese dioxide and Ni(NO 3 ) 2 ·6H 2 The mixture of O was mixed by ball milling, the ball milling speed was 400r / min, and the ball milling time was 3h. Add PEG with an amount greater than 2(x+y+z) to the ball-milled mixture, and stir for about 2 hou...

Embodiment 2

[0039] Take Mn(AC) 2 4H 2 O, Ni(AC) 2 4H 2 O and LiAC were prepared as raw materials. Mn(AC) 2 4H 2 O, Ni(AC) 2 4H 2 O and LiAC are accurately weighed according to the stoichiometric ratio of 3:1:2.1 (5% of the lithium source is excessive to compensate for the loss at high temperature), and the obtained Mn(AC) 2 4H 2 O and Ni(AC) 2 4H 2 O mixed and placed in a ball mill jar for ball milling, the ball milling speed is 600r / min, the ball milling time is 6h, the Mn(AC) obtained by ball milling 2 4H 2 O and Ni(AC) 2 4H 2 O Mixed Mn(AC) 2 4H 2 O and Ni(AC) 2 4H 2 The mixture of O is dry. The dried mixture was mixed with LiAC ball mill, with 1 mol / L oxalic acid solution as the dispersant, the milling speed was 200r / min, and the ball milling time was 5h. Add PEG2000 with an amount greater than 2 (x+y+z) to the ball-milled mixture, and stir for about 5 hours to obtain a black-gray jelly mixture, which is preheated at 300° C. for 2 h. The black-gray colloidal mixtur...

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Abstract

The invention discloses a preparation method of a submicron regular octahedral structure nickel manganate material. The manganese source, the nickel source and the lithium source are accurately weighed according to the stoichiometric ratio; the manganese source and the nickel source obtained by weighing are mixed and mixed together Carry out ball milling; dry the mixture of manganese source and nickel source obtained by ball milling into powder; weigh a certain amount of oxalic acid, and mix the above-mentioned oxalic acid, the weighed lithium source and the mixture of manganese source and nickel source dried into powder by ball milling ; Add a certain amount of PEG to the mixture obtained above, stir to obtain a black-gray colloidal mixture, and preheat the black-gray colloidal mixture; first heat the mixture obtained by preheating at 300 ° C for 1 to 5 h, and then The temperature is raised to 800° C. for 1 to 5 hours, and then annealed to room temperature to obtain a submicron regular octahedral structure lithium nickel manganate material. The present invention utilizes a low-cost high-temperature solid-phase method combined with a polymer-assisted method to obtain a submicron regular octahedral structure lithium nickel manganate material, which greatly improves the cost performance.

Description

technical field [0001] The invention relates to a method for preparing a material, in particular to a method for preparing a lithium nickel manganese oxide material with a submicron octahedral structure. Background technique [0002] In recent years, due to the advantages of high specific capacity, high energy density, good charge-discharge cycle performance, small size and light weight, lithium-ion batteries have gradually attracted great attention. Due to the influence of mobile smart terminals and the electric vehicle market, the industrial scale of the lithium battery industry continues to grow. However, the current status of lithium batteries cannot meet the development of electric vehicles, and there are still many problems to be solved. The positive electrode material of the battery is a research hotspot at present. Although the specific capacity of lithium nickel manganese oxide material is theoretically only 147mAh / g, it is not the highest among positive electrode...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525C01G53/00
CPCC01G53/44C01P2002/72C01P2004/03C01P2006/40H01M4/505H01M4/525H01M2004/021H01M2004/028Y02E60/10
Inventor 谭毅孙健铭王凯薛冰李鹏廷
Owner DALIAN UNIV OF TECH
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