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Lithium iron oxide material and preparation method thereof

A lithium ferrite and lithium source technology, applied in the field of electrochemistry, can solve the problems of the decrease of battery energy density and the first efficiency decrease of battery reversible capacity, and achieve the effect of improving electrical performance and promoting the exertion of capacity.

Inactive Publication Date: 2019-11-26
HUBEI RT ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, during the first charge and discharge process of lithium-ion batteries, the structural changes of positive electrode materials, the shedding of active materials, and the formation of solid electrolyte interfacial films, etc., will reduce the reversible capacity and first-time efficiency of the battery, resulting in a decrease in battery energy density.

Method used

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  • Lithium iron oxide material and preparation method thereof
  • Lithium iron oxide material and preparation method thereof

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preparation example Construction

[0027] One aspect of the present invention provides a Li 5 FeO 4 The preparation method of material, described preparation method comprises the following steps:

[0028] (1) Mix iron source, lithium source, carbon source and deionized water to obtain a mixed solution;

[0029] (2) Grinding the mixed solution obtained in step (1), so that the particle size of the solid particles in the mixed solution is below 0.4 μm;

[0030] (3) Spray-dry the mixed solution after grinding to obtain Li 5 FeO 4 Precursor;

[0031] (4) the Li 5 FeO 4 The precursor is sintered and pulverized to obtain Li 5 FeO 4 Material;

[0032] Wherein, the amount of the carbon source makes the prepared Li 5 FeO 4 The content of the surface carbon coating layer in the material is 0.5-15% by weight, specifically, for example, it can be 0.5% by weight, 1% by weight, 3% by weight, 5% by weight, 7% by weight, 9% by weight, 11% by weight, 13% by weight and 15% by weight. In the present invention, by int...

Embodiment 1

[0047] (1) 1548g LiOH·H 2 O, 500g Fe 2 o 3 , 105g of glucose and deionized water are mixed to obtain a mixed solution.

[0048] (2) Put the mixed liquid obtained in step (1) into a grinder for grinding, so that the particle size of the solid particles in the mixed liquid is below 150nm.

[0049] (3) Spray-dry the mixed solution after grinding to obtain Li 5 FeO 4 Precursor, wherein the spray inlet temperature is 135°C, and the outlet temperature is 90°C.

[0050] (4) the Li 5 FeO 4 The precursor was placed in the sagger, and then put into the box furnace, and the N 2 Under a protective atmosphere, the temperature was raised to 850°C at 2°C / min for sintering, the sintering time was 24h, and then pulverized to obtain the target Li 5 FeO 4 Material S1.

Embodiment 2

[0052] (1) 924g Li 2 CO 3 , 196g Fe 2 o 3 , 200g sucrose and deionized water are mixed to obtain a mixed solution.

[0053] (2) Put the mixed liquid obtained in step (1) into a grinder for grinding, so that the particle size of the solid particles in the mixed liquid is below 200nm.

[0054] (3) Spray-dry the mixed solution after grinding to obtain Li 5 FeO 4 Precursor, wherein the spray inlet temperature is 140°C, and the outlet temperature is 95°C.

[0055] (4) the Li 5 FeO 4 The precursor was placed in the sagger, and then put into the box furnace, and the N 2 Under a protective atmosphere, the temperature was raised to 900°C at 5°C / min for sintering, the sintering time was 48h, and then pulverized to obtain the target Li 5 FeO 4 Material S2.

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Abstract

The invention belongs to the field of electrochemistry, and discloses a lithium iron oxide material, and a preparation method thereof. The preparation method comprises following steps: 1, an iron source, a lithium source, a carbon source, and deionized water are mixed to obtain a mixed solution; 2, the mixed solution is subjected to grinding to control the particle size of solid particles in the mixed solution to be 0.4<mu>m or lower; 3, after grinding, the mixed solution is subjected to spray drying to obtain a lithium iron oxide precursor; and 4, the lithium iron oxide precursor is subjectedto sintering, and crushing so as to obtain the lithium iron oxide material. The using amount of the carbon source is controlled so that the carbon coating layer content in the lithium iron oxide material accounts for 0.5 to 15wt%; the molar ratio of the lithium in the lithium source to the iron in the iron source is controlled to be (5-25) : 1. The prepared lithium iron oxide material possesses excellent irreversibility and excellent capacity performance, so that battery energy density can be increased.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a lithium ferrite material and a preparation method thereof. Background technique [0002] With the development of the market and the continuous improvement of materials and battery technology, the requirements of terminal enterprises for the energy density of lithium-ion batteries are also constantly increasing. At present, common methods to increase the energy density of lithium-ion batteries include using high-nickel ternary materials with high specific capacity as positive electrode materials, using silicon-based materials with higher specific capacity as negative electrode materials, and increasing the working voltage of positive electrode materials and compaction of materials. density etc. [0003] However, during the first charge and discharge process of lithium-ion batteries, the structural changes of positive electrode materials, the shedding of active materials, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00H01M4/62H01M4/58
CPCC01G49/00C01P2002/72H01M4/5825H01M4/625Y02E60/10
Inventor 程光春孙杰
Owner HUBEI RT ADVANCED MATERIALS CO LTD
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