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Lithium-rich manganese-based positive electrode material coated with double conductive layers as well as preparation method and application thereof

A lithium-rich manganese-based, cathode material technology, applied in the field of materials, can solve problems such as unfavorable cycle capacity retention, unsustainable capacity provision, and rapid cycle loss.

Inactive Publication Date: 2021-07-06
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But MnO 2 It cannot provide capacity continuously, the cycle loss is fast, and the ionic conductivity is not high, so this will not be conducive to the maintenance of cycle capacity, and it is not a better coating strategy

Method used

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  • Lithium-rich manganese-based positive electrode material coated with double conductive layers as well as preparation method and application thereof
  • Lithium-rich manganese-based positive electrode material coated with double conductive layers as well as preparation method and application thereof
  • Lithium-rich manganese-based positive electrode material coated with double conductive layers as well as preparation method and application thereof

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preparation example Construction

[0050] The preparation process proposed above has low complexity, the uniformity and completeness of the double-layer coating of the material can be controlled, and it is easy to realize industrial mass production.

[0051] In order to better understand the technical solution provided by the present invention, the following specific examples are used to illustrate the specific process of applying the several methods provided by the above-mentioned embodiments of the present invention to prepare the lithium-rich manganese-based lithium battery cathode material coated with double conductive layers , and its properties.

Embodiment 1

[0053] Step 1, take an appropriate amount of manganese-rich ternary carbonate precursor Ni 0.16 co 0.16 mn 0.68 CO 3 , weigh LiOH according to Li:M=1.55, grind and mix evenly, and carry out three-stage sintering. First, heat at 350°C in air for 2 hours, then heat up to 500°C for 5 hours, and finally heat up to 750°C for 6 hours, and then After natural cooling, a lithium-rich manganese-based material is obtained. Wherein, the heating rate of each stage is 5°C / min.

[0054] Step 2, disperse 880 g of the obtained lithium-rich manganese-based material in 1 L of water, ultrasonicate for 6 hours, then add 9.45 g of dopamine hydrochloride, then add 2.6 g of potassium permanganate and 0.55 g of lithium acetate, and finally add tris ( Tirs) buffer to adjust the pH to 8.5 and stir for 16 hours. After the stirring was completed, the product was collected and freeze-dried for 6 hours to obtain a black double-coated precursor.

[0055] Step 3, the black double-coated layer precursor ...

Embodiment 2

[0063] Step 1, take an appropriate amount of manganese-rich ternary carbonate precursor Ni 0.16 co 0.16 mn 0.68 CO 3 , weigh LiOH according to Li:M=1.65, grind and mix evenly, carry out three-stage sintering, keep warm at 380°C in the air for 7 hours, then heat up to 550°C for 8 hours, and finally heat up to 800°C for 6 hours, and then wait for Lithium-rich manganese-based materials were obtained by natural cooling. Wherein, the heating rate of each stage is 5°C / min.

[0064] Step 2, disperse 880 g of the obtained lithium-rich manganese-based material in 1 L of water, ultrasonicate for 6 hours, add 4.72 g of dopamine hydrochloride, then add 1.58 g of potassium permanganate and 0.28 g of lithium acetate, and finally add Tirs buffer to adjust the pH to 8.5, Stir for 36 hours. After the stirring was completed, the product was collected and freeze-dried for 8 hours to obtain a black double-coated precursor.

[0065] Step 3, the black double-coated layer precursor is firstly ...

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Abstract

The invention relates to a lithium-rich manganese-based positive electrode material coated with double conductive layers as well as a preparation method and application thereof. The lithium-rich manganese-based positive electrode material structurally comprises a lithium-rich manganese-based material core, a spinel lithium manganate coating layer and a nitrogen-doped graphitized carbon coating layer from inside to outside, an overlapping region exists between the spinel lithium manganate coating layer and the nitrogen-doped graphitized carbon coating layer, and the thickness of the overlapping region is 2-20 nm; the sum of the mass of the spinel lithium manganate coating layer and the nitrogen-doped graphitized carbon coating layer accounts for 1%-10% of the mass of the lithium-rich manganese-based positive electrode material; the chemical expression of the lithium-rich manganese-based positive electrode material is xLi[Li0.33Mn0.67]O2.(1-x)LiMO2@LiMn2O4@C, 0<x<1, wherein M at least comprises two elements of Mn, Ni and Co.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a lithium-rich manganese-based positive electrode material coated with a double conductive layer and a preparation method and application thereof. Background technique [0002] With the progress of society, people have higher requirements for the power density and energy density of energy storage devices. Especially at present, lithium-ion batteries (LIBs) are widely used in electric vehicles (EVs) and smart grids, and lithium-ion batteries with high energy and power density are particularly important. Since cathode materials account for nearly half of the total cost of lithium batteries, and their performance directly affects the high performance of various performance indicators of lithium batteries, the lack of cathode materials with excellent electrochemical performance has become a technical bottleneck for the commercial development of advanced lithium-ion batteries. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M4/131H01M10/0525C01G53/00C01G45/12C01B32/205B82Y40/00B82Y30/00
CPCH01M4/624H01M4/625H01M4/505H01M4/525H01M4/131H01M10/0525C01G53/50C01G45/1228C01G45/1242C01B32/205B82Y40/00B82Y30/00C01P2004/64C01P2004/61C01P2004/32C01P2006/40C01P2004/80C01P2002/32Y02E60/10
Inventor 王丽平罗春牛晓滨
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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