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Al2O3-coated modified lithium nickel manganese oxide positive electrode material and preparation method thereof

A technology of lithium nickel manganate and cathode material, applied in the field of lithium nickel manganate cathode material and its preparation, can solve the problems of uneven coating layer, inconsistent crystal growth rate and nucleation rate, etc., and achieves high safety and cost. low effect

Active Publication Date: 2016-11-16
四川省有色冶金研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the above-mentioned problems existing in the prior art, the present invention provides an Al 2 o 3 The coating modified lithium nickel manganese oxide cathode material and its preparation method can effectively solve the problems of inconsistent crystal growth rate and nucleation rate, uneven coating layer, etc.

Method used

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  • Al2O3-coated modified lithium nickel manganese oxide positive electrode material and preparation method thereof
  • Al2O3-coated modified lithium nickel manganese oxide positive electrode material and preparation method thereof
  • Al2O3-coated modified lithium nickel manganese oxide positive electrode material and preparation method thereof

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Embodiment 1

[0034] a kind of Al 2 o 3 Coated modified lithium nickel manganese oxide cathode material, the preparation method of which comprises the following steps:

[0035] (1) with Al 2 o 3 The amount of coating is 1% of the mass of lithium nickel manganese oxide material to calculate the molar number of aluminum element, and then calculate the Al(NO 3 ) 3 , NaAlO 2 The number of moles and mass of Al(NO 3 ) 3 and NaAlO 2 , and were formulated into Al(NO 3 ) 3 solution, 0.5mol / L NaAlO 2 solution;

[0036] (2) Weigh lithium nickel manganese oxide, and ultrasonically disperse it in deionized water according to the ratio of lithium nickel manganese oxide: water = 1g: 30mL to form a suspension, and add 1.5% of the mass of lithium nickel manganese oxide to the suspension Sodium dodecylbenzenesulfonate, ultrasonically dispersed for 15min;

[0037] (3) Slowly add the prepared Al(NO 3 ) 3 30% of the volume of the solution, and ultrasonic 15min, then dropwise added the prepared Na...

Embodiment 2

[0043] a kind of Al 2 o 3 Coated modified lithium nickel manganese oxide cathode material, the preparation method of which comprises the following steps:

[0044] (1) with Al 2 o 3 The amount of coating is 3% of the mass of lithium nickel manganese oxide material to calculate the molar number of aluminum element, and then calculate the Al(NO 3 ) 3 , NaAlO 2 The number of moles and mass of Al(NO 3 ) 3 and NaAlO 2 , and were formulated into Al(NO 3 ) 3 solution, 0.5mol / L NaAlO 2 solution;

[0045] (2) Weigh lithium nickel manganese oxide, and ultrasonically disperse it in deionized water according to the ratio of lithium nickel manganese oxide: water = 1g: 30mL to form a suspension, and add 2.5% of the mass of lithium nickel manganese oxide to the suspension Sodium dodecylbenzenesulfonate, ultrasonically dispersed for 20min;

[0046] (3) Slowly add the prepared Al(NO 3 ) 3 30% of the solution volume, and ultrasonic 20min, then dropwise added the prepared NaAlO 2 ...

Embodiment 3

[0054] a kind of Al 2 o 3 Coated modified lithium nickel manganese oxide cathode material, the preparation method of which comprises the following steps:

[0055] (1) with Al 2 o 3 The amount of coating is 5% of the mass of lithium nickel manganese oxide material to calculate the molar number of aluminum element, and then convert Al(NO 3 ) 3 , NaAlO 2 The number of moles and mass of Al(NO 3 ) 3 and NaAlO 2 , and were formulated into Al(NO 3 ) 3 solution, 0.5mol / L NaAlO 2 solution;

[0056] (2) Weigh lithium nickel manganese oxide, and ultrasonically disperse it in deionized water according to the ratio of lithium nickel manganese oxide: water = 1g: 30mL to form a suspension, and add 3.5% of the mass of lithium nickel manganese oxide to the suspension Sodium dodecylbenzenesulfonate, ultrasonically dispersed for 30min;

[0057] (3) Slowly add the prepared Al(NO 3 ) 3 30% of the volume of the solution, and ultrasonic 30min, then dropwise added the prepared NaAlO to...

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Abstract

The invention discloses an Al2O3-coated modified lithium nickel manganese oxide positive electrode material. A preparation method of the Al2O3-coated modified lithium nickel manganese oxide positive electrode material comprises the following steps of (1) preparing a solution; (2) dispersing lithium nickel manganese oxide into deionized water to form a turbid liquid and adding an anionic surfactant for ultrasonic dispersion for 15-30 minutes; (3) adding an Al(NO3)3 solution to an ultrasonic dispersed solution, carrying out ultrasonic dispersion for 15-30 minutes and then adding an NaAlO2 solution while stirring; (4) adding a citric acid solution of which the concentration is 0.5mol / L to the mixed solution obtained in the step (3) while stirring; (5) carrying out ageing, cleaning and drying; and (6) carrying out high-temperature pyrolysis. The crystal growth rate is consistent with the nucleation rate in the preparation process; coating is uniform; the prepared material is high in safety and low in cost; the energy density and the charge-discharge capacity at high voltage are obviously improved; and the capacity retention ratio reaches 86.3% after 500 charge-discharge cycles at a room temperature under the condition of 1C.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to an Al 2 o 3 Coated and modified lithium nickel manganese oxide cathode material and a preparation method thereof. Background technique [0002] The depletion of fossil fuels such as coal, oil, and natural gas, the world's main energy sources, and the serious pollution of the environment pose a great threat to human survival. Therefore, it is urgent to seek a renewable and clean energy source to replace fossil fuels, which prompts people to To find clean and renewable new energy. Lithium-ion secondary batteries with advantages such as high working voltage, wide working range, high specific energy, long service life and zero pollution have attracted more and more attention. They are not only widely used in energy storage, communication and national defense construction, but also The promotion in the field of new energy has risen to the height of national strategy. From...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 常丽娟王体龙贾元波伍建军高娟
Owner 四川省有色冶金研究院有限公司
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