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Lithium-rich manganese base, spinel and graphene flexible composite positive electrode with sandwich core-shell structure and preparation method thereof

A core-shell structure, lithium-rich manganese-based technology, applied to structural parts, battery electrodes, electrical components, etc., can solve the problems of low energy density of lithium-rich manganese-based positive electrodes, low lithium ion diffusion rate, large irreversible capacity, etc., to achieve Excellent large-rate performance, improved lithium ion diffusion rate, and obvious and reliable performance improvement

Active Publication Date: 2019-06-28
黑龙江瑞霭科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a lithium-rich manganese-based, spinel and graphene flexible composite positive electrode with a sandwich core-shell structure and a preparation method thereof. Low, large irreversible capacity for the first time, and at the same time, in order to overcome the problem of low energy density of lithium-rich manganese-based positive electrodes prepared by traditional coating methods

Method used

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  • Lithium-rich manganese base, spinel and graphene flexible composite positive electrode with sandwich core-shell structure and preparation method thereof
  • Lithium-rich manganese base, spinel and graphene flexible composite positive electrode with sandwich core-shell structure and preparation method thereof
  • Lithium-rich manganese base, spinel and graphene flexible composite positive electrode with sandwich core-shell structure and preparation method thereof

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specific Embodiment approach 1

[0029] Specific embodiment one: a lithium-rich manganese-based, spinel and graphene flexible composite positive electrode with a sandwich core-shell structure, the chemical formula of the lithium-rich manganese-based positive electrode material is aLi 2 MnO 3 ·(1-a)LiMO 2 , the chemical formula of the spinel material is LiMn 2-x m x o 4 , where: 0.1≤a1-x-y Ni x co y , 0≤x≤0.5, 0≤y≤0.5.

[0030] The effect of this embodiment: improve the energy density, flexibility and plasticity of lithium-rich manganese-based positive electrodes; improve the cycle life of lithium-rich manganese-based materials; improve the diffusion rate of electrons and lithium ions in lithium-rich manganese-based materials; The improvement is obvious and reliable, and it has a large specific capacity and excellent rate and cycle performance.

specific Embodiment approach 2

[0031] Embodiment 2: A method for preparing a lithium-rich manganese-based, spinel, and graphene flexible composite positive electrode with a sandwich core-shell structure described in Embodiment 1. The method includes the following process steps:

[0032] Step 1: Prepare manganese-nickel-cobalt carbonate spherical precursor by co-precipitation method;

[0033] Step 2: Uniformly mixing and calcining the manganese-nickel-cobalt carbonate spherical precursor obtained in step 1 and the lithium salt compound to obtain a spherical lithium-rich manganese-based positive electrode material;

[0034] Step 3: Mix the spherical lithium-rich manganese-based positive electrode material obtained in step 2 with the graphene oxide dispersion, and prepare the mixed spherical lithium-rich manganese-based positive electrode material and the graphene oxide dispersion by vacuum filtration to have a sandwich structure Lithium-rich manganese-based and graphene oxide composite films, and finally the ...

specific Embodiment approach 3

[0036] Specific embodiment three: the preparation method of the lithium-rich manganese-based, spinel and graphene flexible composite positive electrode of the sandwich core-shell structure described in the specific embodiment two, the specific steps of the step one are as follows:

[0037] Step (1): Weigh the manganese salt compound, nickel salt compound and cobalt salt compound respectively, and dissolve them all in deionized water and mix them evenly to prepare a mixed metal salt solution M of 0.1~1 mol / L;

[0038] Step (2): Weigh the carbonate precipitant and complexing agent respectively, dissolve them in deionized water and mix them evenly to prepare a mixed solution of carbonate precipitant and complexing agent at 0.1-1 mol / L;

[0039] Step (3): Add the prepared mixed solution of carbonate precipitation agent and complexing agent into the mixed metal salt solution M in step (1) under strong stirring to control the precipitation of mixed metal salt and carbonate The molar r...

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Abstract

The invention discloses a sandwich core-shell structured lithium-rich manganese base, spinel and graphene flexible composite positive electrode and a production method thereof, and belongs to the field of material synthesis. The chemical formula of a lithium-rich manganese base positive electrode material is aLi2MnO3.(1-a)LiMO2, and the chemical formula of a spinel material is LiMn2-xMxO4, wherein x is not less than 0.1 and is less than 1, M = Mn1-x-yNixCoy, x is not less than 0 and not more than 0.5, and y is not less than 0 and not more than 0.5. The production method comprises the following steps: carrying out a coprecipitation technology to obtain a manganese nickel cobalt carbonate spherical precursor, uniformly mixing the precursor with a lithium salt compound, calcining the obtained mixture to obtain the spherical lithium-rich manganese base positive electrode material, mixing the positive electrode material with a graphene oxide dispersion, carrying out a vacuum suction filtration technology to produce a sandwich structured lithium-rich manganese base and graphene oxide composite film, and carrying out high-temperature in-situ carbothermal reduction to produce the sandwich core-shell structured lithium-rich manganese base, spinel and graphene flexible composite positive electrode. The production method has the advantages of simple process and low production cost; and the sandwich core-shell structured lithium-rich manganese base, spinel and graphene flexible composite positive electrode has the advantages of obviously improved and reliable performances, large specific capacity, excellent rate and excellent cycle performances.

Description

technical field [0001] The invention belongs to the technical field of material synthesis, and relates to a lithium-ion battery positive electrode and a preparation method thereof, in particular to a lithium-rich manganese-based / spinel / graphene flexible composite positive electrode with a sandwich / core-shell structure and a preparation method thereof. Background technique [0002] Lithium-ion batteries are superior to other secondary batteries due to their high operating voltage, high energy density, and low environmental pollution, making them ideal power sources for portable electronic devices. At present, the specific capacity of lithium-ion battery negative electrode materials is usually above 300mAh / g, while the specific capacity of positive electrode materials has always hovered around 150 mAh / g. The cathode material is the only or main provider of lithium ions in lithium-ion batteries, and it is also the bottleneck for the improvement of energy density and price reduc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/139H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/139H01M4/366H01M4/505H01M4/525H01M4/625H01M10/0525Y02E60/10
Inventor 王振波玉富达阙兰芳王敏君薛原夏云飞顾大明
Owner 黑龙江瑞霭科技有限公司
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