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Cathode active material for a lithium secondary battery containing phosphate fluoride and preparation method thereof

A cathode active material, lithium secondary battery technology, applied in secondary batteries, battery electrodes, lithium storage batteries, etc., can solve the problems of limited stability improvement effect, low energy density, limitations, etc.

Active Publication Date: 2013-05-15
FDG KINETIC CHONGQING LITHIUM ION BATTERY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, although cathode active materials such as LiFePO 4 can significantly improve the stability of batteries, but their application is limited due to low energy density, etc.
In addition, some electrochemically inactive materials such as Al 2 o 3 and AlF 3 , can improve battery life cycle, but their effect on stability improvement is limited

Method used

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  • Cathode active material for a lithium secondary battery containing phosphate fluoride and preparation method thereof
  • Cathode active material for a lithium secondary battery containing phosphate fluoride and preparation method thereof
  • Cathode active material for a lithium secondary battery containing phosphate fluoride and preparation method thereof

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preparation example Construction

[0039] In one embodiment, the preparation method of the cathode active material of the present invention comprises the steps of: (a) combining a precursor containing nickel, cobalt and manganese with a lithium-containing compound, a fluorine (F)-containing compound, and a phosphate-containing (PO4 ) together; and (b) sintering the mixture obtained in step (a) to obtain the compound of formula 1 above further doped or coated with fluorophosphate.

[0040] The fluorine-containing compound can be selected from NH 4 F, NH 4 HF 2 , NH 4 PF 6 , LiF, LiAlF 6 , AlF 3 , MgF 2 , CaF 2 , MnF 2 , MnF 3 , FeF 2 , FeF 3 、CoF 2 、CoF 3 、NiF 2 、TiF 4 , CuF, CuF 2 , ZnF 2 , polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, and a group consisting of mixtures thereof. The phosphate-containing compound can be selected from NH 4 h 2 PO 4 , (NH 4 ) 2 HPO 4 、H 3 PO 4 , Li 3 PO 4 , LiH 2 PO 4 , MgHPO 4 , Mg 3 (PO 4 ) 2 , Mg(H 2 PO 4 ) ...

preparation example 1

[0058] Preparation Example 1: Preparation of cathode active material precursor (Ni:Co:Mn=6:2:2)

[0059] NiSO 4 ·6H 2 O. CoSO 4 ·7H 2 O and MnSO 4 ·H 2 O was mixed in a molar ratio of 6:2:2, and 2 Purified distilled water to prepare a 2M metal salt solution. The metal salt solution was poured into a continuous stirred tank reactor (CSTR) at a flow rate of 250 mL / hr.

[0060] A 25% ammonia solution was poured into the reactor through the ammonia solution inlet at a flow rate of 40 mL / hr. Further, 40% NaOH aqueous solution was automatically poured into the reactor through the NaOH solution inlet at a flow rate of 105-120 mL / hr, and at the same time, the pH was maintained at 11.3 by using a pH measuring instrument and a regulator. The temperature of the reactor was set at 40° C., the holding time (RT) was controlled at 10 hr, and the mixed solution was stirred at 800 rpm.

[0061] The resulting reaction mixture was filtered, purified with distilled water, and dried to ob...

preparation example 2

[0062] Preparation Example 2: Preparation of cathode active material precursor (Ni:Co:Mn=7:1:2)

[0063] NiSO 4 ·6H 2 O. CoSO 4 ·7H 2 O and MnSO 4 ·H 2 O was mixed in a molar ratio of 7:1:2, and 2 Purified distilled water to prepare a 2M metal salt solution. The metal salt solution was poured into a 1 L capacity Couette-Taylor reactor through the metal salt solution inlet at a flow rate of 200 mL / hr.

[0064] A 25% ammonia solution was poured into the reactor through the ammonia solution inlet at a flow rate of 35 mL / hr. Further, 40% NaOH aqueous solution was automatically poured into the reactor through the NaOH solution inlet at a flow rate of 85-100 mL / hr, and at the same time, the pH was maintained at 11.2 using a pH measuring instrument and a regulator. The temperature of the reactor was set at 40° C., the holding time (RT) was controlled at 3 hr, and the mixed solution was stirred at 600 rpm.

[0065] The resulting reaction mixture was filtered, purified with di...

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Abstract

Provided is a cathode active material for a lithium secondary battery containing the compound of Formula 1 doped or coated with phosphate fluoride, prepared by adding phosphate fluoride to the precursor compound and subjecting to sintering and heat-treatment process, which has improved lifecycle and stability so that it can be used to improve the efficiency of the lithium secondary battery: €ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ Formula 1 Li a Ni x Co y M' z Mn( 1-x-y-z ) O 2 wherein M', a, x, y and z are the same as defined in the specification.

Description

technical field [0001] The invention relates to a fluorine-containing phosphate cathode active material for a lithium secondary battery and a preparation method thereof. Background technique [0002] As technology for mobile devices becomes more and more advanced and demand for mobile devices increases, demand for secondary batteries as energy sources is rapidly growing. Among such secondary batteries, lithium secondary batteries are generally widely used due to their high energy density, high operating voltage, long service life and low self-discharge rate. [0003] A typical lithium secondary battery contains LiPF 6 Salt acts as an electrolyte. However, the LiPF 6 Salt easily interacts with the humidity in the atmosphere, namely H 2 O reacts to form HF molecules, which in turn react with the cathode surface to release oxygen and elute transition metals, resulting in a significantly shortened battery life. For this reason, the surface of the cathode is coated with a st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/58Y02E60/122H01M4/5825H01M4/525H01M10/0525H01M4/366H01M4/364H01M4/485Y02E60/10H01M10/052
Inventor 卢荣镐金亨谟金炳秀张宰赫李载龙
Owner FDG KINETIC CHONGQING LITHIUM ION BATTERY MATERIALS CO LTD
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