Preparation method of carbon-doped lithium iron borate

A technology of lithium iron borate and lithium carbonate is applied in the field of preparation of carbon-doped lithium iron borate, which can solve the problems of easy absorption of moisture and oxygen, decreased product performance, large specific surface area of ​​the product, etc. The effect of low resistance and large contact area

Inactive Publication Date: 2020-08-18
蒋达金
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The products obtained by the current conventional methods have a large specific surface area, which is easy to absorb moisture and oxygen, resulting in a decrease in product performance.

Method used

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  • Preparation method of carbon-doped lithium iron borate
  • Preparation method of carbon-doped lithium iron borate
  • Preparation method of carbon-doped lithium iron borate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A kind of preparation method of carbon-doped lithium iron borate, it is the following steps:

[0049] Add ferrocene boric acid into toluene, stir and mix evenly, then add lithium carbonate, and then pass through a sand mill until the particle size of the slurry is 147nm, and then spray dry once to obtain a spray-dried material, once spray-dried The material is put into the roller furnace for primary calcining to obtain the primary calcined material. The primary calcined material is added to xylene and paraffin, added to a ball mill and fully ground until the particle size of the primary calcined material is 1.95 μm, and then spray-dried for the second time to obtain the secondary calcined material. The spray-dried material is subjected to secondary calcining, and the secondary calcined material is air-pulverized, sieved, iron-removed and vacuum-packed to obtain carbon-doped lithium iron borate;

[0050] In a spray drying process, keep the inlet air temperature at 350°C,...

Embodiment 2

[0068] A kind of preparation method of carbon-doped lithium iron borate, it is the following steps:

[0069] Add ferrocene boric acid into toluene, stir and mix evenly, then add lithium carbonate, and then pass through a sand mill until the particle size of the slurry is 100nm, and then spray dry once to obtain a spray-dried material, once spray-dried The material is put into the roller furnace for one calcining to obtain the primary calcined material, and the primary calcined material is added to xylene and paraffin, added to a ball mill and fully ground until the particle size of the primary calcined material is 1 μm, and then the secondary spray drying is obtained to obtain the secondary spray The dried material is subjected to secondary calcining, and the secondary calcined material is air-pulverized, sieved, iron-removed and vacuum-packed to obtain carbon-doped lithium iron borate;

[0070] In a spray drying process, keep the inlet air temperature at 250°C, the temperatur...

Embodiment 3

[0086] A kind of preparation method of carbon-doped lithium iron borate, it is the following steps:

[0087] Add ferrocene boric acid into toluene, stir and mix evenly, then add lithium carbonate, and then pass through a sand mill until the particle size of the slurry is 125nm, and then spray dry once to obtain a spray-dried material, once spray-dried Put the raw material into the roller furnace for primary calcining to obtain the primary calcined material, add xylene and paraffin to the primary calcined material, add it into the ball mill and grind it fully until the particle size of the primary calcined material is 1.5 μm, and then spray dry it twice to obtain the secondary calcined material The spray-dried material is subjected to secondary calcining, and the secondary calcined material is air-pulverized, sieved, iron-removed and vacuum-packed to obtain carbon-doped lithium iron borate;

[0088] In a spray drying process, keep the inlet air temperature at 301°C, the tempera...

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Abstract

The invention discloses a preparation method of carbon-doped lithium iron borate. The preparation method comprises the steps: adding ferrocene boric acid into methylbenzene; uniformly stirring and mixing, then adding lithium carbonate, and sanding by a sand mill; sanding until the particle size of slurry is 100 to 150 nm; carrying out primary spray drying, to obtain a primary spray-dried material;putting the primary spray-dried material into a roller way furnace for primary calcination, to obtain a primary calcined material; and adding xylene and paraffin into the primary calcined material, adding into a ball mill, fully grinding until the particle size of the primary calcined material is 1-2 microns, carrying out secondary spray drying to obtain a secondary spray-dried material, carryingout secondary calcination, carrying out jet milling on the secondary calcined material, screening, removing iron, and carrying out vacuum packaging to obtain the carbon-doped lithium iron borate. Theprepared lithium iron borate is good in stability and electrochemical performance, the 0.1 C first discharge capacity can be larger than or equal to 200 mA*h/g, the cycle performance and the rate capability are good, and the low-temperature performance is excellent.

Description

technical field [0001] The invention relates to a preparation method of carbon-doped lithium iron borate, which belongs to the field of new energy battery materials. Background technique [0002] Lithium iron borate (LiFeBO 3 ) as a high-capacity lithium battery cathode material, the theoretical specific capacity is 220mAh / g, and the theoretical specific capacity of lithium iron phosphate is only 170mAh / g, with better conductivity and a very small volume change rate (~2%). Structurally speaking, borate (BO 3 ) to (PO 4 ) has a small molar mass (58.8<95), and the lithium iron borate structure can provide lithium ion conduction and electronic conduction at the same time. Preparation of this material requires great care, as the electrochemical performance of the material deteriorates rapidly upon contact with moisture. [0003] The product obtained by the current conventional method has a large specific surface area, which is easy to absorb moisture and oxygen, resulting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/12C01D15/08H01M4/36H01M4/58H01M4/62H01M10/0525
CPCC01B35/128C01D15/08C01P2004/03C01P2004/61C01P2004/64C01P2006/10C01P2006/12C01P2006/40C01P2006/80H01M4/366H01M4/5825H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 蒋达金
Owner 蒋达金
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