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Core-shell heterogeneous lithium-ion battery composite positive electrode material composed of layered lithium-rich manganese-based and spinel-type lithium manganate and preparation method thereof

A technology for compounding cathode materials and lithium ion batteries, which is applied to battery electrodes, circuits, structural parts, etc., can solve problems such as difficulty in controlling the uniformity of slurry mixing, affecting the electrochemical performance of electrode pieces and batteries, and uneven distribution of cathode active materials. , to achieve the effect of easy industrial large-scale promotion and application, eliminating the production process and excellent electrochemical performance

Active Publication Date: 2020-04-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are differences in the physical and chemical properties of different positive electrode materials. Due to the difference in density and other properties when mixing positive electrode materials, the uniformity of the slurry is not easy to control, which will lead to uneven distribution of the positive electrode active material after the electrode sheet is made, affecting the electrode. Electrochemical properties of sheets and batteries

Method used

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  • Core-shell heterogeneous lithium-ion battery composite positive electrode material composed of layered lithium-rich manganese-based and spinel-type lithium manganate and preparation method thereof
  • Core-shell heterogeneous lithium-ion battery composite positive electrode material composed of layered lithium-rich manganese-based and spinel-type lithium manganate and preparation method thereof
  • Core-shell heterogeneous lithium-ion battery composite positive electrode material composed of layered lithium-rich manganese-based and spinel-type lithium manganate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] According to Li 2 MnO 3 Weigh 0.3463g of anhydrous lithium acetate and 0.6305g of manganese acetate, add deionized water to make 100mL solution, add 10g of spinel lithium manganate to the above mixed solution in a water bath at 80°C at 600 rpm Stir evenly and dry; the obtained product is calcined at 700° C. for 6 hours, ground and sieved to obtain a composite material.

[0050] The charging and discharging performance tests of the composite materials obtained in the following examples and comparative examples are carried out according to the following method: mix the obtained composite materials, acetylene black, and PVDF in a mass ratio of 8:1:1, add NMP and grind them into a uniform slurry Then coated on aluminum foil, dried at 120°C for 12h, with metal lithium sheet as the negative electrode, 1M LiPF 6 A CR2023 button cell was made for the electrolyte. The electrochemical performance test voltage is 3-4.3V, 0.2C (1C=148mAh / g) cycle for 2 cycles and then 1C cycle, ...

Embodiment 2

[0052] Weigh 10g of spinel-type lithium manganate and 0.5g of polyvinylpyrrolidone, add deionized water and sonicate for 2 hours; place the sonicated solution in a water bath at 80°C at 600 rpm and continue to stir; according to 0.5Li 2 MnO 3 0.5LiMn 0.5 Ni 0.5 o 2 Weigh 0.2963g of anhydrous lithium acetate, 0.5241g of manganese acetate, and 0.1774g of nickel acetate into the above-mentioned continuously stirring solution, and dry; the obtained product is calcined at 750°C for 6h, ground and sieved to obtain a composite material.

[0053] The electrochemical test method of the composite material obtained in this embodiment is the same as that in embodiment 1.

Embodiment 3

[0055] Weigh 10g of spinel lithium manganate and 0.5g of polyvinylpyrrolidone, add deionized water and sonicate for 1h; place the sonicated solution in a water bath at 80°C at 600 rpm and continue to stir; according to 0.5Li 2 MnO 3 0.5LiMn 0.5 Ni 0.5 o 2 Weigh 0.2963g of anhydrous lithium acetate, 0.5241g of manganese acetate, and 0.1774g of nickel acetate into the above-mentioned continuously stirring solution, and dry; the obtained product is calcined at 850°C for 6h, ground and sieved to obtain a composite material.

[0056] The electrochemical test method of the composite material obtained in this embodiment is the same as that in embodiment 1.

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Abstract

The invention discloses a core-shell isomerous lithium ion battery composite positive electrode material formed by layered lithium-rich manganese base and spinel type lithium manganate and a preparation method of the positive electrode material, and belongs to the field of a lithium ion battery electrode material. The lithium ion battery composite positive electrode material takes spinel type lithium manganate LiMn2O4 as an inner core and takes layered lithium-rich manganese base xLi2MnO3.(1-x)LiMO2 (x is greater than 0 and less than or equal to 1, M is MnaNibCo1-a-b, a is greater than 0 and b is less than 1) as a shell; according to the preparation method, the spinel type lithium manganate inner core is prepared firstly, and then the layered lithium-rich manganese base shell is prepared through a PVP auxiliary combustion method or a wet chemical method; the prepared lithium ion battery composite positive electrode material has high electrochemical cycle stability both at the room temperature and at a high temperature of 55 DEG C; and in addition, the method is simple in process and convenient to operate, and high in compatibility with preparation of lithium manganate by a high-temperature solid-phase method, and industrial production can be realized easily.

Description

technical field [0001] The invention relates to a lithium-ion battery composite positive electrode material, in particular to a core-shell heterogeneous lithium-ion battery composite positive electrode material composed of layered lithium-rich manganese base and spinel lithium manganate and a preparation method thereof; The field of cathode materials for ion batteries. Background technique [0002] With the rapid development of new energy vehicles, lithium-ion batteries with high energy density and long cycle life have received more and more attention. Among the commercial lithium-ion battery cathode materials, spinel-type lithium manganese oxide is favored by the society due to its advantages such as high energy density, low cost, and environmental friendliness. However, the structural stability and high-temperature cycle performance of spinel lithium manganate are poor, which hinders the large-scale application of lithium manganate cathode materials. [0003] In the rese...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505
CPCH01M4/366H01M4/505Y02E60/10
Inventor 胡国荣彭忠东杜柯曹雁冰王高峰
Owner CENT SOUTH UNIV
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