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Aluminum-coated nickel cobalt magnesium lithium cathode material and preparation method thereof

A technology of lithium cobalt magnesium oxide and cathode material, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of large irreversible capacity at the first discharge, incomplete reaction of lithium carbonate, deterioration of cycle performance, etc., and achieve high first charge and discharge efficiency. , the effect of reducing cation mixing, improving high temperature performance and cycle performance

Inactive Publication Date: 2013-04-17
HENAN SUN RISING LITHIUM ENERGY TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] LiNiO 2 Due to the synthesis of Ni 2+ Difficult to completely oxidize to Ni 3+ As a result, during the high-temperature crystallization process, Ni 2+ Occupy Li + position, resulting in mixed cations, resulting in poor thermal stability, large irreversible capacity for the first discharge, and LiNiO 2 More Ni4 in late charge + The ions have strong oxidizing properties, which will cause the reaction with the electrolyte to form gas, which will cause the battery to expand, and the cycle performance will deteriorate.
And LiNiO 2 The preparation temperature is low, the excess lithium carbonate cannot be completely reacted, and the residual lithium on the surface causes gas production during the battery cycle, resulting in low initial efficiency and poor cycle performance
At present, mainly for LiNiO 2 To solve its shortcomings, modification methods mainly include doping, coating and other methods, but simple doping or coating cannot completely solve the problem

Method used

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  • Aluminum-coated nickel cobalt magnesium lithium cathode material and preparation method thereof

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Embodiment 1

[0029] An aluminum-coated nickel-cobalt lithium magnesium oxide positive electrode material, its chemical formula is: Al 2 o 3 [Li 1.05 Ni 0.8 co 0.15 Mg 0.05 o 2 ].

[0030] A method for preparing an aluminum-coated nickel-cobalt lithium magnesium oxide positive electrode material, the specific steps are as follows:

[0031] (1) Mixing: set the particle size D50 to 10μmNi(OH) 2 7415g of CoC with particle size D50 of 3μm 2 o 4 2204g of MgC with particle size D50 of 2μm 2 o 4 2H 2 O742g battery grade Li with a particle size D50 of 3 μm and a content of 99.5% 2 CO 3 Add 3898g into the high-speed mixer together, so that the molar coefficient ratio Ni:Co:Mg=0.8:0.15:0.05, (Ni+Co+Mg):Li=1:1.05, mix at a speed of 1300r / min for 1h;

[0032] (2) Sintering: Put the mixture in step (1) into a corundum crucible, place it in an atmosphere box furnace, and raise the temperature to 500°C at a rate of 2°C / min in an oxygen atmosphere, keep it warm for 6 hours, and then heat it a...

Embodiment 2

[0038] An aluminum-coated nickel-cobalt lithium magnesium oxide positive electrode material, its chemical formula is: Al 2 o 3 [Li 1.15 Ni 0.8 co 0.1 Mg 0.1 o 2 ].

[0039] A method for preparing an aluminum-coated nickel-cobalt lithium magnesium oxide positive electrode material, the specific steps are as follows:

[0040] (1) Mixing material: Co 2 o 3 829g MgO403g with particle size D50 of 0.5μm and battery grade LiOH2767g with particle size D50 of 2μm and content of 99.5% were added to the high-speed mixer together, so that the molar coefficient ratio Ni:Co:Mg=0.8:0.1:0.1, (Ni+Co +Mg): Li=1:1.15, mixed at 1500r / min for 0.2h;

[0041] (2) Sintering: Put the mixture in step (1) into a corundum crucible, place it in a pusher tunnel kiln, and raise the temperature to 400°C at a rate of 1°C / min in an oxygen atmosphere, keep it warm for 3 hours, and then heat it for 2 Raise the temperature to 700°C at a speed of ℃ / min, keep it warm for 24 hours, then cool down to room t...

Embodiment 3

[0046] An aluminum-coated nickel-cobalt lithium magnesium oxide positive electrode material, its chemical formula is: Al 2 o 3 [LiNi 0.7 co 0.2 Mg 0.1 o 2 ].

[0047] A method for preparing an aluminum-coated nickel-cobalt lithium magnesium oxide positive electrode material, the specific steps are as follows:

[0048] (1) Mixing: set the particle size D50 to 15 μm Ni 2 o 3 5788g of Co with particle size D50 of 0.5μm 3 o 4 1605g of Mg(OH) with particle size D50 of 1μm 2 583g of battery-grade Li with a particle size D50 of 3μm and a content of 99.5% 2 CO 3 Add 3712g into the high-speed mixer together, so that the molar coefficient ratio Ni:Co:Mg=0.7:0.2:0.1, (Ni+Co+Mg):Li=1:1, mix at 800r / min for 2h;

[0049] (2) Sintering: Put the mixture in step (1) into a corundum crucible, place it in a rotary kiln, and raise the temperature to 600°C at a rate of 5°C / min in an oxygen atmosphere, keep it warm for 10 hours, and then heat it up at a rate of 2°C / min. Raise the tempe...

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Abstract

The invention discloses an aluminum-coated nickel cobalt magnesium lithium cathode material and a preparation method thereof. The aluminum-coated nickel cobalt magnesium lithium cathode material has a chemical formula as follows: Al2O3 [Li1+zNixCoyMg-(1-x-y)O2], in which z is more than or equal to 0 and less than or equal to 0.15, x is more than or equal to 0.7 and less than or equal to 0.85, y is more than or equal to 0.1 and less than or equal to 0.2, and x plus y is less than 1. The preparation method of the aluminum-coated nickel cobalt magnesium lithium cathode material comprises the following steps: mixing, sintering, performing aluminum coating, and secondarily sintering. Nickel, cobalt, magnesium and aluminum compounds are taken as raw materials, thus reducing influence of other anions, stabilizing a layered structure of LiNiO2 and reducing cation shuffling; the aluminum-coated nickel cobalt magnesium lithium cathode material is high in specific capacity, high in first charge and discharge efficiency, good in cycle performance, excellent in high-temperature performance and good in safety; and the preparation method of the aluminum-coated nickel cobalt magnesium lithium cathode material is simple in process, the production process is easy to control, large-scale production is easy to realized, the production cycle is short, the cost is low, no waste water or waste gas is produced in the whole process, and the preparation method is environment-friendly.

Description

technical field [0001] The invention relates to an aluminum-coated nickel-cobalt lithium magnesium oxide positive electrode material and a preparation method thereof, belonging to the technical field of battery positive electrode material preparation. Background technique [0002] Lithium-ion battery (Lithium Ion Battery referred to as LIB) is the third generation of small batteries after nickel-cadmium batteries and nickel-metal hydride batteries. As a new type of electrochemical energy, it has the outstanding advantages of high working voltage, large specific energy, stable discharge potential curve, small self-discharge, long cycle life, good low temperature performance, no memory, no pollution, etc. The dual requirements of small size, light weight and environmental protection required by portable electrical appliances are widely used in small electronic devices such as mobile communications, notebooks, and camera-players. They are also ideal power supplies for future el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/62
CPCY02E60/10
Inventor 余强方真
Owner HENAN SUN RISING LITHIUM ENERGY TECH
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