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Method for modifying lithium-rich manganese-based cathode material

A cathode material, lithium-rich manganese-based technology, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as large-scale production that is not suitable for industrialization, and achieve the stability of material crystal structure, improve electrochemical performance, The effect of strong bond energy

Active Publication Date: 2015-06-03
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the modification process of the above precursors requires the addition of soluble aluminum salts, (Ni 1 / 3 co 1 / 3 mn 1 / 3 )(OH) 2 Put it in absolute ethanol, and slowly add ammonia water to realize the Al of the ternary precursor 2 o 3 Coated, not suitable for industrial mass production

Method used

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  • Method for modifying lithium-rich manganese-based cathode material
  • Method for modifying lithium-rich manganese-based cathode material
  • Method for modifying lithium-rich manganese-based cathode material

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Embodiment 1

[0026] A method for modifying the lithium-rich manganese-based cathode material of the present invention, comprising the following steps:

[0027] (1) Weigh aluminum fluoride (AlF 3 )0.2793g, weigh the precursor (Mn 0.675 Ni 0.1625 co 0.1625 )(OH) 2 10.0000g, weigh lithium carbonate (Li 2 CO 3 ) 6.4502g, the three are fully mixed uniformly; wherein the aluminum element content in the doped modified metal fluoride salt is 3mol% of the metal element content contained in the precursor;

[0028] (2) Sinter the above mixed material at a sintering temperature of 970°C for 15h at a heating rate of 10°C / min, and then cool to room temperature with the furnace to obtain AlF 3 Modified lithium-rich manganese-based cathode materials (Li 1.2 mn 0.54 Ni 0.13 co 0.13 o2 ).

[0029] From the above-mentioned AlF of this embodiment 3 XRD patterns of modified lithium-rich manganese-based cathode materials ( figure 1 ) shows that AlF 3 The addition of makes the lithium-rich phase di...

Embodiment 2

[0032] A method for modifying the lithium-rich manganese-based cathode material of the present invention, comprising the following steps:

[0033] (1) Weigh zirconium fluoride (ZrF 4 )0.9268g, weigh the precursor (Mn 0.675 Ni 0.1625 co 0.1625 )(OH) 2 10.0000g, weigh lithium carbonate (Li 2 CO 3 ) 6.4502g, the three are fully mixed uniformly; wherein the zirconium element content in the doped modified metal fluoride salt is 5mol% of the metal element content contained in the precursor;

[0034] (2) Sinter the above mixed material at a sintering temperature of 850°C for 48h at a heating rate of 10°C / min, and then cool to room temperature with the furnace to obtain ZrF 4 Modified lithium-rich manganese-based cathode materials (Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 ).

[0035] The ZrF that is made by this embodiment 4 The TEM spectrum of modified lithium-rich manganese-based cathode material (see Figure 5 ) It can be seen that the above-mentioned modification process c...

Embodiment 3

[0037] A method for modifying the lithium-rich manganese-based cathode material of the present invention, comprising the following steps:

[0038] (1) Weigh ammonium fluorotitanate (N 2 h 8 TiF 6 ) 1.7081g, weigh the precursor (Mn 0.75 Ni 0.25 )CO 3 10.0000g, weigh lithium carbonate (Li 2 CO 3 ) 5.0212g, the three are fully mixed uniformly; wherein the content of titanium element in the doped modified metal fluoride salt is 10mol% of the content of the metal element contained in the precursor;

[0039] (2) Sinter the above-mentioned uniformly mixed mixture at a sintering temperature of 1000°C for 24 hours, with a heating rate of 10°C / min, and then cool to room temperature with the furnace to obtain ammonium fluorotitanate-modified lithium-rich manganese-based positive electrode material (Li 1.2 mn 0.6 Ni 0.2 o 2 ).

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Abstract

The invention discloses a method for modifying a lithium-rich manganese-based cathode material. The method comprises the following steps: preparing a precursor of the lithium-rich manganese-based cathode material, uniformly mixing the precursor with lithium carbonate and doping and modifying metal villiaumite, sintering the uniformly mixed mixture at a high temperature to obtain a modified lithium-rich manganese-based cathode material. The modification process of the method disclosed by the invention is simple and easy to control, the steps of the existing preparation process are not added, and the electrochemical performance of the product is excellent.

Description

technical field [0001] The invention belongs to the technical field of modification of positive electrode materials of lithium ion batteries, and in particular relates to a method for modifying lithium-rich manganese-based positive electrode materials. Background technique [0002] The increasingly severe energy and environmental problems have intensified people's desire for high-performance energy storage devices. Lithium-ion batteries, which have been commercially used in mobile phones, notebook computers and other fields, also show great application prospects in large-scale fixed power stations and vehicle power supplies. . Among them, the development of high-performance lithium-ion battery cathode materials is one of the key factors to realize the commercialization of lithium-ion batteries in the above fields. Compared with traditional olivine and spinel-type cathode materials, layered cathode materials have higher theoretical specific energy, and are more suitable for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/58H01M4/1391
CPCY02E60/10
Inventor 庞胜利沈湘黔王永刚习小明景茂祥周友元廖达前黄承焕
Owner CHANGSHA RES INST OF MINING & METALLURGY
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