Ferrous lithium sulphate fluoride as well as preparation method and application thereof

A lithium ferrous fluorosulfate, reaction technology, applied in the direction of ferric sulfate, electrical components, electrochemical generators, etc., can solve the problems of restricting competitive advantages and wide application, unfavorable large-scale production, high equipment requirements, etc., to achieve suitable The effect of large-scale production, simple method and high degree of practicality

Active Publication Date: 2011-01-05
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reported preparation process needs to use ionic liquid as a solvent, the reaction conditions are harsh, and the requirem...

Method used

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  • Ferrous lithium sulphate fluoride as well as preparation method and application thereof
  • Ferrous lithium sulphate fluoride as well as preparation method and application thereof
  • Ferrous lithium sulphate fluoride as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1, preparation lithium ferrous fluorosulfate

[0022] by FeSO 4 ·H 2 The molar ratio of O:LiF=1:1.1 was weighed, and tetraethylene glycol was added as a solvent, and mixed evenly. React at 300°C for 5h. After the reaction was completed, it was separated and dried to obtain a powdery solid.

[0023] Powder X-ray diffractometer (Rigaku DmaxrB, CuK α X-ray) analysis confirmed the structure. The result is as figure 1 shown. As can be seen from the figure, there is no impurity peak in the spectrogram, indicating that the product is of high purity.

[0024] The morphology of lithium ferrous fluorosulfate was characterized by a scanning electron microscope (JEOL-6700F), as shown in figure 2 shown. It can be seen from the figure that the particle size range of this material is 20-200nm, and the particles with a particle size of 159.4nm and particles with a particle size of 71.7nm are marked in the figure.

[0025] Electrochemical performance characterizati...

Embodiment 2

[0029] Embodiment 2, preparation lithium ferrous fluorosulfate

[0030] by FeSO 4 ·H 2 Weigh the molar ratio of O:LiF=1:1.15, add glycerol as a solvent, and mix well. React at 285°C for 36h. Complete, separated and dried to obtain a powdery solid. The lithium ferrous fluorosulfate prepared in this example and the test results of the simulated battery are listed in Table 1.

Embodiment 3

[0031] Embodiment 3, preparation lithium ferrous fluorosulfate

[0032] by FeSO 4 ·H 2 The molar ratio of O:LiF=1:1.2 was weighed, and polyethylene glycol (weight-average molecular weight: 200) was added as a solvent, and mixed evenly. React at 250°C for 60h. Complete, separated and dried to obtain a powdery solid. The lithium ferrous fluorosulfate prepared in this example and the test results of the simulated battery are listed in Table 1.

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Abstract

The invention discloses ferrous lithium sulphate fluoride as cathode materials of lithium batteries as well as a preparation method and application thereof. The ferrous sulphate lithium fluoride is prepared according to the following steps of: adding FeSO4.xH2O, LiF and a solvent into a reaction container and mixing the added substances to obtain a reaction solution, and heating the reaction solution to 200-350 DEG C for reaction to obtain the ferrous sulphate fluoride, wherein x in the FeSO4.xH2O is an integer greater than or equal to 0, and the solvent is alcohol or polyethylene glycol containing at least one hydroxide radical. In the invention, the preparation method is simple and the raw materials are rich and easy to obtain; thus, the preparation method is suitable for mass production and has high practicality degree. In addition the obtained ferrous lithium sulphate fluoride is in nanoparticles with high actual capacity and can be directly used as cathode materials of lithium-ion batteries.

Description

technical field [0001] The invention relates to lithium ferrous fluorosulfate and its preparation method and application. Background technique [0002] With the widespread application of lithium-ion batteries in portable electronic products, electric vehicles and plug-in hybrid electric vehicles, positive electrode materials for lithium-ion batteries (such as LiCoO 2 , LiMn 2 o 4 , LiFePO 4 ) and anode materials (such as C, Sn, Si) are increasingly in-depth research. Compared with negative electrode materials, the research on positive electrode materials is relatively lagging behind. Such as commercial LiCoO 2 There are issues of stability, cost, and environment. LiFePO 4 Due to the advantages of low price, abundant resources, no environmental pollution, moderate voltage platform and high capacity, it has become a hot spot for development. But LiFePO 4 Poor electrical conductivity limits the full utilization of its active materials, requiring carbon coating or dopin...

Claims

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Application Information

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IPC IPC(8): C01G49/14H01M4/1397H01M4/58H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 郭玉国郭维万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
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