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Preparation method of alumina coated Li(NixCoyMn1-x-y)O2 lithium ion battery anode material

A lithium-ion battery and cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems affecting the purity and electrochemical performance of lithium-nickel-cobalt-manganese-oxygen cathode materials, and improve electrochemical cycle performance and thermal stability. The effect of reducing the generation of impurities and improving the purity

Active Publication Date: 2014-02-05
QINGDAO GUOXUAN BATTERY CO LTD
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AI Technical Summary

Problems solved by technology

Although Mn was avoided by inert gas protection during the synthesis 2+ It is oxidized and heterogeneous, but Mn(OH) inevitably occurs in subsequent processes such as washing and drying 2 Oxidation reaction leads to irreversible reaction, which seriously affects the purity and electrochemical performance of lithium nickel cobalt manganese oxide cathode material

Method used

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  • Preparation method of alumina coated Li(NixCoyMn1-x-y)O2 lithium ion battery anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Nickel salt, cobalt salt and manganese salt are made into mixed salt solution A according to the molar ratio of x:y:1-x-y ratio, wherein x<1, y<1, x+y<1;

[0027] (2) Sodium hydroxide is dissolved in water to form solution B;

[0028] (3) ammoniacal liquor is dissolved in water, is made into solution C;

[0029] (4) Add solution A, solution B and solution C at the same molar ratio of 1:1:0.05 under nitrogen protection, adjust the pH to 9, and react for 5 hours at a temperature of 50°C;

[0030] (5) Aluminum isopropoxide and solution A are added to step (4) at a molar ratio of 0.1%:1, and the reaction is carried out at a temperature of 50° C. for 1 h;

[0031] (6) The product obtained in step (5) was filtered, washed and dried overnight at 100°C to obtain aluminum hydroxide modified coated Li(Ni x co y mn 1-x-y )O 2 Precursor.

[0032] (7) Aluminum hydroxide modified coated Li(Ni x co y mn 1-x-y )O 2 The precursor was fully mixed with lithium salt by wet me...

Embodiment 2

[0034] (1) Nickel salt, cobalt salt and manganese salt are made into mixed salt solution A according to the molar ratio of x:y:1-x-y ratio, wherein x<1, y<1, x+y<1;

[0035] (2) Sodium hydroxide is dissolved in water to form solution B;

[0036] (3) ammoniacal liquor is dissolved in water, is made into solution C;

[0037] (4) Add solution A, solution B and solution C at the same molar ratio of 1:1:0.3 under nitrogen protection, adjust the pH to 11, and react at a temperature of 60°C for 8 hours;

[0038] (5) Aluminum isopropoxide and solution A are added to step (4) at a molar ratio of 0.5%:1, and the reaction is carried out at a temperature of 60° C. for 3 hours;

[0039] (6) The product obtained in step (5) was filtered, washed and dried overnight at 100°C to obtain aluminum hydroxide modified coated Li(Ni x co y mn 1-x-y )O 2 Precursor.

[0040] (7) Aluminum hydroxide modified coated Li(Ni x co y mn 1-x-y )O 2 The precursor was fully mixed with lithium salt by we...

Embodiment 3

[0042] (1) Nickel salt, cobalt salt and manganese salt are made into mixed salt solution A according to the molar ratio of x:y:1-x-y ratio, wherein x<1, y<1, x+y<1;

[0043] (2) Sodium hydroxide is dissolved in water to form solution B;

[0044] (3) ammoniacal liquor is dissolved in water, is made into solution C;

[0045] (4) Add solution A, solution B and solution C at the same molar ratio of 1:1:0.5 under nitrogen protection, adjust the pH to 12, and react at a temperature of 80°C for 12 hours;

[0046] (5) adding aluminum isopropoxide and solution A to step (4) at a molar ratio of 10%:1, and reacting for 5 hours at a temperature of 80°C;

[0047] (6) The product obtained in step (5) was filtered, washed and dried overnight at 100°C to obtain aluminum hydroxide modified coated Li(Ni x coy mn 1-x-y )O 2 Precursor.

[0048] (7) Aluminum hydroxide-coated Li(Ni x co y mn 1-x-y )O 2 The precursor was fully mixed with lithium salt by wet method, and calcined in air at 50...

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Abstract

The invention discloses a preparation method of an alumina coated Li(NixCoyMn1-x-y)O2 lithium ion battery anode material, belonging to the field of application of the lithium ion battery anode material. The preparation method is characterized by comprising the following steps: introducing aluminum isopropoxide during synthesis of Li(NixCoyMn1-x-y)O2 precursor through a hydroxyl coprecipitation method to prepare aluminum hydroxide modified coated Li(NixCoyMn1-x-y)O2 precursor; doping lithium and performing high-temperature calcining to prepare alumina modified coated Li(NixCoyMn1-x-y)O2. According to the preparation method, the problem of oxidation occurring in washing and drying of the synthesis process of the Li(NixCoyMn1-x-y)O2 precursor through the hydroxyl coprecipitation method is solved; the alumina modified coated Li(NixCoyMn1-x-y)O2 obtained by using the method shows superior stability and high-temperature cyclicity.

Description

technical field [0001] The invention relates to an aluminum oxide coated Li(Ni x co y mn 1-x-y )O 2 A method for preparing a cathode material for a lithium ion battery. Background technique [0002] Lithium-ion battery is a high-energy battery that has developed rapidly in the past ten years. It has become an important direction for the development of my country's new energy industry in terms of technical indicators such as life, specific energy, and voltage, and from the environment. The lithium nickel cobalt manganese oxide cathode material has the advantages of high specific capacity, good thermal stability and low price, and is considered to be a positive electrode material with the most potential to replace lithium cobalt oxide. At present, the preparation of lithium nickel cobalt manganese oxide materials widely adopts the co-precipitation method to first prepare lithium nickel cobalt manganese oxide precursor, and then mix with lithium salt to prepare lithium nick...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/62
CPCH01M4/505H01M4/525H01M4/628Y02E60/10
Inventor 王启岁张昌春
Owner QINGDAO GUOXUAN BATTERY CO LTD
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