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Method for preparing nano-scale lithium manganese phosphate

A lithium manganese phosphate, nano-scale technology, applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of easy agglomeration, high energy consumption of solid phase method, uneven product particle size, etc.

Active Publication Date: 2017-07-18
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there are many ways to prepare lithium manganese phosphate, the most common of which is the solid-phase method, which can produce pure-phase lithium manganese phosphate, but high-temperature calcination is prone to agglomeration, resulting in uneven particle size, and Solid phase method consumes a lot of energy

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  • Method for preparing nano-scale lithium manganese phosphate
  • Method for preparing nano-scale lithium manganese phosphate
  • Method for preparing nano-scale lithium manganese phosphate

Examples

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Embodiment 1

[0034] refer to figure 1 , In this embodiment, a method for preparing nanoscale lithium manganese phosphate is provided. The method comprises the steps of:

[0035] S1, preparing aluminum grid-based lithium phosphate pole pieces;

[0036] S1, using the manganese sheet as the anode, electrolyzing in the imidazole ionic liquid, introducing manganese ions into the imidazole ionic liquid to form the imidazole ionic liquid containing manganese ions;

[0037] S3. Electrodeposition is performed in an imidazole ionic liquid containing manganese ions by using an aluminum mesh-based lithium phosphate pole piece as a cathode, and nanometer lithium manganese phosphate is generated on the cathode.

[0038] The imidazole-based ionic liquid containing manganese ions used in this example is an organic molten salt in a liquid state at or near room temperature. Compared with traditional organic solvents, it is completely composed of anions and cations, and the relatively high ionic environme...

Embodiment 2

[0056] In this embodiment, step S1 includes the following sub-steps:

[0057] S1.1, 100mL of LiOH·H with a concentration of 1mol / L 2 O solution was stirred and heated to 50°C and kept constant;

[0058] S1.2, using a peristaltic pump in LiOH·H 2 Add 50 mL of H with a concentration of 0.6 mol / L dropwise into the O solution 3 PO 4 Solution, the dropping rate is 5mL / min;

[0059] S1.3. Leave the solution formed in step S1.2 to stand, and the chemical reaction 3LiOH+H occurs 3 PO 4 → Li 3 PO 4 (S)+3H 2 O gives the precipitated product solid Li 3 PO 4 ;

[0060] S1.4. Wash the precipitated product, dry it in vacuum, and then calcinate at 300°C for 4h to form white Li 3 PO 4 Powder;

[0061] S1.5, the aluminum mesh and the white Li 3 PO 4 The powder is pressed into an aluminum mesh-based lithium phosphate pole piece by a tablet machine, wherein, during the pressing process, the pressure is 10 MPa, and the pressure is maintained for 2 minutes. The aluminum mesh base ...

Embodiment 3

[0071] Specifically, step S1 includes the following sub-steps:

[0072] S1.1, 100mL of LiOH·H with a concentration of 1mol / L 2 O solution was stirred and heated to 50°C and kept constant;

[0073] S1.2, using a peristaltic pump in LiOH·H 2 Add 50 mL of H with a concentration of 0.6 mol / L dropwise into the O solution 3 PO 4 Solution, the dropping rate is 5mL / min;

[0074] S1.3. Leave the solution formed in step S1.2 to stand, and the chemical reaction 3LiOH+H occurs 3 PO 4 → Li 3 PO 4 (S)+3H 2 O, to obtain the precipitated product solid Li 3 PO 4 ;

[0075] S1.4. Wash the precipitated product, dry it in vacuum, and then calcinate at 300°C for 4h to form white Li 3 PO 4 Powder;

[0076] S1.5, the aluminum mesh and the white Li 3 PO 4 The powder is pressed into an aluminum mesh-based lithium phosphate pole piece by a tablet machine, wherein, during the pressing process, the pressure is 10 MPa, and the pressure is maintained for 2 minutes. The aluminum grid base l...

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Abstract

The invention relates to a method for preparing nano-scale lithium manganese phosphate. The method comprises the following steps of S1, preparing an aluminum mesh based lithium phosphate pole piece; S2, using a manganese sheet as an anode, carrying out electrolysis in imidazole ionic liquid, and introducing a manganese ion into the imidazole ionic liquid, so as to form manganese ion-containing imidazole ionic liquid; S3, using the aluminum mesh based lithium phosphate pole piece as a cathode, carrying out electrodeposition in the manganese ion-containing imidazole ionic liquid, and generating the nano-scale lithium manganese phosphate on the cathode. According to the method, lithium manganese phosphate which can be used for a positive-pole material of a lithium-ion battery is prepared for the first time by utilizing the electrodeposition in the imidazole ionic liquid; the sources of raw materials are simple; the cost is low; the granularity of the made nano-scale lithium manganese phosphate is more uniform. Moreover, the imidazole ionic liquid can be circularly used for multiple times; further, a side reaction is not generated; the preparation process is green and environment-friendly; the technique is simple; the process is easily controlled; the energy consumption is low.

Description

technical field [0001] The invention relates to a method for preparing nanoscale lithium manganese phosphate. Background technique [0002] The application of lithium-ion batteries is very wide, and the cathode material is the most important part of lithium-ion batteries, and it is also the key to determine the performance of lithium-ion batteries. Lithium manganese phosphate cathode material has abundant sources of raw materials, low synthesis cost, and high energy density (about 700Wh·kg -1 ), friendly to the environment, etc., and LiMnPO 4 The tetrahedral structure formed by high-strength P-O covalent bonds has a stable skeleton, making LiMnPO 4 Has a stable crystal structure, which ensures that LiMnPO 4 The safety of cathode materials, these advantages make lithium manganese phosphate extremely promising, and become the focus of current research. [0003] At present, there are many ways to prepare lithium manganese phosphate, the most common of which is the solid-pha...

Claims

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Application Information

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IPC IPC(8): C01B25/45B82Y30/00
CPCB82Y30/00C01B25/45C01P2002/72C01P2004/03C01P2004/64C01P2006/12C01P2006/40
Inventor 罗绍华李俊哲王庆张俊刘彩玲黄红波王志远包硕张亚辉黎耀文丁学勇刘延国郝爱民
Owner NORTHEASTERN UNIV
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