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A kind of nickel-aluminum co-doped trimanganese tetraoxide and preparation method thereof

A technology of trimanganese tetraoxide and trimanganese tetraoxide material, which is applied in the direction of structural parts, electrical components, battery electrodes, etc., can solve the problems of microscopic segregation of nickel and manganese, low capacity, uneven mixing of trimanganese tetraoxide, etc. Achieve the effect of large specific surface area, high activity and accurate stoichiometric ratio

Active Publication Date: 2019-11-12
HUNAN CHANGYUAN LICO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is mainly based on the fact that the preparation technology of spherical manganese tetraoxide in China is very mature and the output is huge, and manganese tetraoxide is also a kind of spinel compound, and it is used as raw material to prepare spinel lithium nickel manganese oxide. The positive electrode material is easier; but in the method of this patent, the nickel source compound and trimanganese tetroxide still have the phenomenon of uneven mixing, which leads to the segregation of the distribution of nickel and manganese on the microscopic scale in the synthesized product, thus The capacity of the product is low, and its 1C initial discharge capacity is only about 125mAh / g

Method used

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  • A kind of nickel-aluminum co-doped trimanganese tetraoxide and preparation method thereof
  • A kind of nickel-aluminum co-doped trimanganese tetraoxide and preparation method thereof
  • A kind of nickel-aluminum co-doped trimanganese tetraoxide and preparation method thereof

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Embodiment 1

[0044] A preparation method of nickel-aluminum co-doped trimanganese tetraoxide of the present invention comprises the following steps:

[0045] (1) the particle size D 50 Add manganese metal powder of 200 μm into the aqueous solution to make a slurry, then add nickel sulfate and aluminum chloride, and stir to obtain a mixed slurry; the three raw materials of manganese metal powder, nickel sulfate and aluminum chloride are prepared according to the element molar ratio n(Mn ):n(Ni):n(Al)=0.73:0.25:0.02 for proportioning;

[0046] (2) Add ammonium acetate, sodium hydroxide and ammoniacal liquor to the mixed slurry after step (1) successively, control the stirring speed of the reaction process to be 700rmp, the reaction temperature is 55°C, the reaction time is 20h, and the pH value is controlled at 10.0 , the solid-to-liquid ratio is 1:5, and the manganese hydroxide slurry doped with nickel and aluminum is obtained from the reaction; wherein, the concentration of ammonium aceta...

Embodiment 2

[0051] A preparation method of nickel-aluminum co-doped trimanganese tetraoxide of the present invention comprises the following steps:

[0052] (1) the particle size D 50 Add manganese metal powder of 200 μm into the aqueous solution to make a slurry, then add nickel acetate and aluminum nitrate, and stir to obtain a mixed slurry; the three raw materials of manganese metal powder, nickel acetate and aluminum nitrate are according to the element molar ratio n (Mn): n(Ni):n(Al)=0.75:0.22:0.03 for proportioning;

[0053] (2) Ammonium bicarbonate, sodium hydroxide and ammoniacal liquor are added successively in the mixed slurry after step (1), the stirring speed of controlling the reaction process is 900rmp, the reaction temperature is 70°C, the reaction time is 15h, and the pH value is controlled at 9.0, the solid-to-liquid ratio is 1:4, and the manganese hydroxide slurry doped with nickel and aluminum is obtained from the reaction; among them, the concentration of ammonium bic...

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Abstract

The invention provides nickel-aluminum co-doped manganous-manganic oxide. The nickel-aluminum co-doped manganous-manganic oxide has the molecular formula: (MnxNiyAlz)3O4, the ratio of x, y and z is (0.7-0.8):(0.2-0.3):(0.005-0.1) and has the particle size D50 ranging from 5 mu m to 15 mu m, the specific surface area ranging from 30 m<2> / g to 50 m<2> / g and the tap density larger than or equal to 0.4 g / cm<3>. The invention further provides a preparation method of the nickel-aluminum co-doped manganous-manganic oxide. A heterogeneous reaction of metal manganese and water and a co-precipitation reaction of nickel salt and aluminum salt can occur simultaneously in a water solution by adjusting proper technical parameters, and manganese elements, nickel elements and aluminum elements are uniformly mixed in a product on an atomic level and are distributed completely uniformly on a micro level. The nickel-aluminum co-doped manganous-manganic oxide prepared with the method has the characteristics of large specific surface area, small crystal particles, high activity and accurate stoichiometric ratio.

Description

technical field [0001] The invention belongs to the technical field of manganese-based basic materials for lithium-ion batteries, and in particular relates to a nickel-aluminum co-doped trimanganese tetraoxide and a preparation method thereof. Background technique [0002] With the expansion of the application field of lithium-ion batteries, people have higher and higher requirements for the performance of lithium-ion batteries. The research and development of high-voltage, high-capacity positive and negative electrode materials is a hot spot in current research. Spinel-type lithium manganese oxide LiM doped with metal ions x mn 2－x o 4 (M=Ni, Co, Fe, Cu, etc.) are a class of high-potential cathode materials that have attracted widespread attention due to their voltage plateau above 4.5V and higher energy density. Among these materials, lithium nickel manganese oxide LiNi 0.5 mn 1.5 o 4 There is 4.7V (relative to Li / Li + ) voltage platform, its theoretical specific ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/52
CPCH01M4/505H01M4/525Y02E60/10
Inventor 廖达前胡柳泉赵荣波何杜李林
Owner HUNAN CHANGYUAN LICO CO LTD
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