Cathode active material coated with fluorine compound for lithium secondary batteries and method for preparing the same

A cathode active material and secondary lithium battery technology, applied in secondary batteries, nickel compounds, cobalt compounds, etc., can solve problems such as difficult synthesis, shortened cycle life, and thermal instability

Inactive Publication Date: 2008-04-02
ENERCERAMIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

LiNiO 2 The problem is that it is difficult to synthesize and unstable when heated, making LiNiO 2 not suitable for commercialization
However, the shortened cycle life and the outgassing due to the decomposition of the electrolyte during charge and discharge are still unresolved.

Method used

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  • Cathode active material coated with fluorine compound for lithium secondary batteries and method for preparing the same
  • Cathode active material coated with fluorine compound for lithium secondary batteries and method for preparing the same
  • Cathode active material coated with fluorine compound for lithium secondary batteries and method for preparing the same

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preparation example Construction

[0048] The present invention also provides a preferred preparation method of a secondary lithium battery cathode active material coated with a fluorine compound, the method comprising the following steps: mixing a fluorine (F) compound and an element precursor in an aqueous solution to obtain highly dispersed fluorine compound powder, adding the cathode active material solution of the secondary lithium battery into the aqueous solution, and reacting the mixed solution at a temperature of 50-100° C. for 3-48 hours so that the cathode active material is coated with the fluorine compound.

[0049] The reason for the high co-precipitation reaction temperature is that the co-precipitation of the element precursor can form a highly dispersed precipitate in a complex state.

[0050] A fluorine (F) compound powder with a high degree of dispersion is obtained after mixing the fluorine (F) compound with the elemental precursor for some time. Since the coating process is performed after ...

Embodiment 1

[0060] 1. Preparation of AlF 3 Coated LiCoO 2

[0061] In a 500 ml beaker, 2 mol% Al(NO 3 ) 3 9H 2 O was dissolved in 150 ml of distilled water, and then the commercially available LiCoO 2 Active materials are added thereto. Stir the mixture. Separately, continuously add 150 mL of NH to the aforementioned solution at a flow rate of 1 mL / min 4 F solution (6 mole %) while maintaining the reactor temperature at 80°C. The mixed solution was subjected to coprecipitation, followed by stirring for 24 hours. At this time, the average temperature of the reactor was maintained at 80°C. The reason for the high co-precipitation reaction temperature is that AlF 3 Co-precipitation can form a highly dispersed precipitate in a composite state. Fluorine compound-coated LiCoO was washed with distilled water 2 , dried at 110 °C for 12 h in a hot-air thermostat and calcined at 400 °C in an inert atmosphere to obtain the final AlF 3 Coated LiCoO 2 .

[0062] 2. AlF 3 Coated LiCoO ...

Embodiment 2

[0078] 1. Preparation of ZnF 2 Coated LiCoO 2

[0079] In a 500 ml beaker, 2 mol% Zn(NO 3 ) 3 ·H 2 O was dissolved in 150 ml of distilled water, and then the commercially available LiCoO 2 Active materials are added thereto. Stir the mixture. Separately, continuously add 150 mL of NH to the aforementioned solution at a flow rate of 1 mL / min 4 F solution (4 mole %) while maintaining the reactor temperature at 80°C. The mixed solution was subjected to coprecipitation, followed by stirring for 24 hours. At this time, the average temperature of the reactor was maintained at about 80°C. The reason for the high reaction temperature of coprecipitation is that ZnF 2 Co-precipitation can form a highly dispersed precipitate in a composite state. Fluorine compound-coated LiCoO was washed with distilled water 2 , dried at 110 °C for 12 h in a hot-air thermostat and calcined at 400 °C in an inert atmosphere to obtain the final ZnF2-coated LiCoO 2 .

[0080] 2. ZnF 2 Coated L...

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Abstract

Disclosed herein is a cathode active material coated with a fluorine compound for lithium secondary batteries. The cathode active material is structurally stable, and improves the charge-discharge characteristics, cycle characteristics, high-voltage characteristics, high-rate characteristics and thermal stability of batteries.

Description

technical field [0001] The invention relates to a surface treatment method for a cathode active material of a secondary lithium battery. The secondary lithium battery has excellent cycle performance and excellent high-rate performance. More specifically, the present invention relates to a secondary lithium battery with improved charge and discharge performance, cycle performance, high voltage performance and thermal stability by coating the cathode active material of the secondary lithium battery with a fluorine compound. Background technique [0002] The demand for rechargeable secondary lithium batteries as power sources for digital communication portable electronic devices such as personal digital assistants (PDAs), cellular phones and notebook computers, as well as electric bicycles and electric vehicles is growing rapidly. The performance of these devices is largely affected by secondary batteries, which are key components of these devices. Therefore, batteries with hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02
CPCC01G53/50C01G53/42C01G45/1242H01M4/525C01P2002/32Y02T10/7011C01P2006/40C01G51/50C01P2004/03C01P2002/54H01M10/0525H01M4/505H01M4/362C01G45/1228Y02E60/122H01M4/582H01M2004/028C01P2002/72C01P2004/80C01G51/42C01P2002/85C01G45/1221Y02E60/10H01M4/04H01M4/485H01M4/58
Inventor 宣良国金佑成韩贞敏
Owner ENERCERAMIC
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