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Preparation method of high-density lithium battery anode material spinel lithium manganate

A type of lithium manganate and cathode material technology, applied in the field of lithium battery cathode materials, can solve the problems of high tap density, difficult, and easily damaged current collectors, and achieve the effect of improving overall performance, power characteristics, and electrode density.

Inactive Publication Date: 2013-10-23
GUANGZHOU LIBODE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the material particles prepared by this method all have a typical octahedral structure (that is, a spinel structure), with sharp edges and corners.
It is difficult to achieve a high tap density when the particles are piled together. In addition, during the coating and rolling process of the electrode sheet, the sharp edges and corners of the particles are easy to damage the current collector.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 1. First, prepare MnOOH by chemical method: add the aqueous solution containing manganese ions dropwise to the alkaline solution under strong stirring; during this process, a precipitation reaction occurs, and the precipitated product MnOOH; subsequently, the precipitated product MnOOH is separated, washed, and dried; 2. Mix the prepared MnOOH with lithium salt, and then calcine at a high temperature to prepare spherical or quasi-spherical spinel lithium manganate particles. The obtained product has a particle size of 5 um and a tap density of 2.3 g / cm 3 . The prepared LiMn 2 o 4 The particles, conductive agent and binder are mixed according to the mass ratio of 85:5:10, and then the conventional thickness is controlled and coated on the aluminum foil current collector. With 1.0 mol / L LiPF 6 / EC+DEC+DMC (volume ratio 1:1:1) is the electrolyte, the Li sheet is the negative electrode, and the Cellgard-2400 polypropylene film made in the United States is the diaphragm,...

Embodiment 2

[0019] 1. First, prepare MnOOH by chemical method: add the aqueous solution containing manganese ions dropwise to the alkaline solution under strong stirring; during this process, a precipitation reaction occurs, and the precipitated product MnOOH; subsequently, the precipitated product MnOOH is separated, washed, and dried; 2. Mix the prepared MnOOH with lithium salt, and then calcine at a high temperature to prepare spherical or spherical Li 1.05 mn 1.95 o 4particles. The particle size of the obtained product is 5-10um, and the tap density is 2.3g / cm 3 . Li will be prepared 1.05 mn 1.95 o 4 The particles, conductive agent and binder are mixed according to the mass ratio of 85:5:10, and then the conventional thickness is controlled and coated on the aluminum foil current collector. With 1.0 mol / L LiPF 6 / EC+DEC+DMC (volume ratio 1:1:1) is the electrolyte, the Li sheet is the negative electrode, and the Cellgard-2400 polypropylene film made in the United States is the ...

Embodiment 3

[0021] 1. First, prepare MnOOH by chemical method: add the aqueous solution containing manganese ions dropwise to the alkaline solution under strong stirring; during this process, a precipitation reaction occurs, and the precipitated product MnOOH; subsequently, the precipitated product MnOOH is separated, washed, and dried; 2. Mix the prepared MnOOH with lithium salt and MgO, and then calcine at a high temperature to prepare spherical or spherical LiMg 0.05 mn 1.95 o 4 particles. The particle size of the obtained product is 5-10 um, and the tap density is 2.4g / cm 3 . The prepared LiMg 0.05 mn 1.95 o 4 , Conductive agent and binder are mixed according to the mass ratio of 85:5:10, and then the conventional thickness is controlled and coated on the aluminum foil current collector. With 1.0 mol / L LiPF 6 / EC+DEC+DMC (volume ratio 1:1:1) is the electrolyte, the Li sheet is the negative electrode, and the Cellgard-2400 polypropylene film made in the United States is the di...

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Abstract

The invention discloses a preparation method of high-density lithium battery anode material spinel lithium manganate. The preparation method comprises the following steps of: step 1, dripping a water solution containing manganese ions into an alkaline solution under the condition of agitating by strong force to obtain sediment product MnOOH; separating the sediment product MnOOH, washing and drying; 2, mixing the prepared MnOOH with a lithium salt or mixing the lithium salt with other metal oxides; and carrying out high-temperature calcination to prepare the spherical or sphere-like-shaped spinel lithium manganate, wherein the grain diameter of obtained spinel lithium manganate grains is in a range of 1-10 microns. If the spherical or sphere-like-shaped spinel lithium manganate LiMn2O4 prepared by the method disclosed by the invention or a monobasic or polybasic compound LiMxMn2-xO4 doped with other metal elements is applied to an ion battery, the density of electrodes of the battery can be improved and the volumetric specific energy density of the battery is increased, so that the whole performance of the battery is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of lithium battery cathode materials, in particular to a spinel type lithium manganese oxide LiMn 2 o 4 method of preparation. Background technique [0002] With the depletion of petroleum resources and the aggravation of environmental pollution, battery-powered hybrid electric vehicles and pure electric vehicles have become a global hot topic. Recently, countries around the world have given significant support to the development of electric vehicles and formulated corresponding development plans, hoping to alleviate the increasingly serious energy crisis and air pollution problems. At present, large lithium-ion batteries are considered to be the most potential automotive power batteries. Many automobile manufacturers at home and abroad are embarking on the research of lithium-ion batteries for vehicles, and have already achieved partial commercialization. Spinel-type lithium manganate has the advantag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505C01G45/12
CPCY02E60/122Y02E60/10
Inventor 郭军骆宏钧
Owner GUANGZHOU LIBODE NEW MATERIAL
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