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Cathode material of lithium ion battery and preparation method and application of cathode material

A technology for lithium-ion batteries and positive electrode materials, applied in the field of lithium-ion battery positive electrode materials and their preparation, can solve problems affecting commercial applications, poor electrochemical performance stability, etc., to suppress dissolution, improve lattice stability, and improve The effect of the discharge voltage plateau

Inactive Publication Date: 2015-04-29
QINGHAI CONTEMPORARY AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But LiMn x Fe 1-x PO 4 Compared with LiFePO, the electronic conductivity and ion diffusion rate 4 low, limiting the LiMn x Fe 1-x PO 4 The electrochemical performance of the electrode affects its commercial application
[0004] LiMn is currently prepared industrially x Fe 1-x PO 4 Main methods of materials and preparation of LiFePO 4 The method is similar, whether it is a solid-phase synthesis method or a liquid-phase synthesis method, the prepared LiMn x Fe 1-x PO 4 All materials have the disadvantage of poor electrochemical performance stability

Method used

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  • Cathode material of lithium ion battery and preparation method and application of cathode material
  • Cathode material of lithium ion battery and preparation method and application of cathode material
  • Cathode material of lithium ion battery and preparation method and application of cathode material

Examples

Experimental program
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Effect test

Embodiment 1

[0060] Example 1 Sample 1 # ~13 # preparation of

[0061] The specific preparation process of the cathode material sample is as follows:

[0062] Mix manganese source, iron source, silicon source, M source with water to obtain mixture I; add phosphorus source to mixture I while stirring, keep stirring evenly, and dry at 80°C for 24 hours to obtain mixture II. Put the mixture II, lithium source, lithium fluoride and carbon source into the ball mill tank of the ball mill for ball milling with alcohol as the medium, and dry at 60°C for 4 hours after ball milling to obtain the precursor. The precursor is placed in a tube furnace and calcined after passing through a dynamic inactive gas. The space velocity of the inactive gas passing through the precursor is 0.1h -1 (mass of inactive gas passing through unit mass of precursor per unit time); after calcination, cool to room temperature, and pulverize the obtained solid by airflow crushing method to obtain the positive electrode m...

Embodiment 2

[0075] The particle size test of embodiment 2 sample

[0076] To embodiment 1 gained sample 1 # ~13 # And comparative sample D1 obtained in comparative examples 1-4 # ~D4 # The particle size of its precursor and its precursor were analyzed, and the results are shown in Table 1.

Embodiment 3

[0077] The element composition and structure test of embodiment 3 samples

[0078] Determination of sample 1 by ICP-OES # ~13 # and comparative sample D1 # ~D4 # Among them, the composition of elements with atomic number greater than 9, the results are shown in Table 2.

[0079] Sample 1 was analyzed on the Shanghai Dekai HCS-140 high-frequency infrared carbon and sulfur analyzer # ~13 # and comparative sample D1 # ~D4 # The carbon content was analyzed, and the results are shown in Table 2.

[0080] Adopt transmission electron microscope TEM to embodiment 1 gained sample 1 # ~13 # And comparative sample D1 obtained in comparative examples 1-4 # ~D4 # Observe and record the thickness range of the carbon coating, the results are shown in Table 2.

[0081] For sample 1 # ~13 # and D1 # ~D4 # Do XRD analysis, the results show that they all have the same crystal structure as the orthorhombic olivine-type lithium iron phosphate. Typical Representative Sample 1 # Th...

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Abstract

The application discloses a cathode material of a lithium ion battery and a preparation method and application of the cathode material. Through the use of the cathode material, the change rate of the relative volume of the cathode material can be reduced under the conditions of the embedding of a lithium ion and the extraction of the lithium ion, and besides the dissolution of Mn in the cathode material is effectively restrained in a charging process and a discharging process, so that the stability of a crystal structure of the cathode material in the operating condition is improved. The lithium ion battery made from the cathode material has an excellent cycle property, an excellent safety property and an excellent high temperature storage property.

Description

technical field [0001] The application relates to a lithium-ion battery cathode material and a preparation method thereof, belonging to the technical field of lithium-ion batteries. Background technique [0002] With the improvement of lithium-ion battery performance and the decline of cost, its application range in consumer electronics, electric vehicles, energy storage and other markets is expanding day by day. In lithium-ion batteries, the cathode material is the key factor determining the performance of lithium-ion batteries, and the development of cathode materials with excellent electrochemical performance and safety performance is an important research topic in the field of lithium-ion batteries. [0003] As the positive electrode material of lithium ion battery, lithium manganese iron phosphate (LiMn x Fe 1-x PO 4 ) has more than lithium iron phosphate (LiFePO 4 ) Higher working voltage platform and theoretical energy density, and also has many advantages such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/136H01M10/0525
CPCH01M4/136H01M4/5805H01M4/582H01M10/0525H01M4/625H01M4/5825H01M4/366C01B25/455H01M2004/028Y02E60/10
Inventor 吴关
Owner QINGHAI CONTEMPORARY AMPEREX TECH
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