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Lithium-rich manganese-based cathode material coated with composite carbon material and preparation method thereof, and lithium battery

A lithium-rich manganese-based, positive electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor stability, uneven coating, material conductivity, battery rate performance, and cycle stability. , to increase the conductivity

Active Publication Date: 2019-01-08
桑德新能源技术开发有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the above-mentioned problems in the prior art, one of the objects of the present invention is to provide a lithium-rich manganese-based positive electrode material coated with a composite carbon material and a preparation method thereof, which solves the problem of poor stability of the carbon-coated material in the prior art, and Small surface area, non-uniform coating, etc. are not obvious technical problems in improving the conductivity of the material and the rate performance and cycle stability of the battery containing the material

Method used

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  • Lithium-rich manganese-based cathode material coated with composite carbon material and preparation method thereof, and lithium battery
  • Lithium-rich manganese-based cathode material coated with composite carbon material and preparation method thereof, and lithium battery
  • Lithium-rich manganese-based cathode material coated with composite carbon material and preparation method thereof, and lithium battery

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Embodiment 1

[0045] This embodiment provides a method for preparing a lithium-rich manganese-based positive electrode material coated with a composite carbon material, comprising the following steps:

[0046] S01, preparing a lithium-rich manganese-based positive electrode material, specifically including the following sub-steps:

[0047] a1. Preparation of lithium-rich manganese-based precursor by carbonate co-precipitation method, the chemical formula is Mn 0.54 Ni 0.13 co 0.13 (CO 3 ) 0.8 . Specifically, it is prepared by mixing soluble manganese salt, soluble nickel salt and soluble cobalt salt to form a mixed salt solution, then adding carbonate solution as a precipitating agent, adding a complexing agent at the same time, and finally carrying out co-precipitation reaction. For the specific process, please refer to the existing steps of the carbonate co-precipitation method, which will not be repeated here.

[0048] a2. Mix the lithium-rich manganese-based precursor and lithium ...

Embodiment 2

[0076] This embodiment provides a method for preparing a lithium-rich manganese-based positive electrode material coated with a composite carbon material, comprising the following steps:

[0077] S01. Prepare a lithium-rich manganese-based cathode material.

[0078] Specifically, the chemical formula is 0.5Li 2 MnO 3 0.5LiNi 0.5 co 0.2 mn 0.3 o 2 . Refer to Example 1 for the entire preparation process, the only difference is that in this example, when sintering in step a3, first raise the temperature to 400°C at a rate of 2°C / min, sinter for 6 hours, continue to heat up to 700°C, and sinter 20h. For other parameters, refer to Embodiment 1, which will not be repeated here.

[0079] S02. Prepare COFs materials. In this embodiment, PZ-COF-1 powder is prepared by solvothermal method, including the following sub-steps:

[0080] b1. Place 1,2,4,5-tetraaminobenzene (110.0mg, 1.0mmol) and hexahydroxytriphenylene (108.0mg, 1.0mmol) in a polytetrafluoroethylene-lined autoclave,...

Embodiment 3

[0087] This embodiment provides a method for preparing a lithium-rich manganese-based positive electrode material coated with a composite carbon material, comprising the following steps:

[0088] S01. Prepare a lithium-rich manganese-based cathode material.

[0089] Specifically, the chemical formula is 0.4Li 2 MnO 3 0.6LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 . Refer to Example 1 for the entire preparation process. The only difference is that in this example, when sintering in step a3, the temperature is raised to 450°C at a rate of 5°C / min, sintered for 3.5 hours, and then heated to 900°C. Sintering for 18h. For other parameters, refer to Embodiment 1, which will not be repeated here.

[0090] S02. Prepare COFs materials. In this embodiment, the solvothermal method is used to prepare COF-5 powder, including the following sub-steps:

[0091] b1. Put 1,4-benzenediboronic acid (BDBA; 185mg, 1.116mmol) and 2,3,6,7,10,11-hexahydroxytriphenylene (HHTP; 241.5mg, 0.745mmol) in polytetraflu...

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Abstract

The invention relates to a lithium-rich manganese-based cathode material coated with a composite carbon material derived from a COFs material containing at least one element of N and B, and a preparation method thereof, and a lithium battery, wherein the surface of the lithium-rich manganese-based cathode material is coated with a composite carbon material. The lithium-rich manganese-based cathodematerial coated with the composite carbon material can obviously improve the conductivity of the material and the rate performance and cycle performance of the battery containing the composite carbonmaterial, and the composite carbon material is coated more uniformly. The invention adopts a simple one-step carbonization method to prepare a composite porous carbon material coated with a lithium-rich manganese-based cathode material, the prepared porous carbon has controllable specific surface area and pore size, and the preparation method is simple and efficient, and is suitable for large-scale preparation and synthesis.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium-rich manganese-based cathode material coated with a composite carbon material, a preparation method thereof, and a lithium battery. Background technique [0002] At present, layered oxides are widely used as cathode materials in commercial lithium-ion batteries, such as 3C, EV and ESS, due to their high plateau voltage and relatively high specific capacity. However, traditional cathode materials with moderate specific capacity cannot meet the cruising range requirements of EVs and HEVs. Therefore, it is particularly necessary to develop a new generation of high energy density cathode materials. [0003] Layered lithium-rich manganese-based cathode material xLi 2 MnO 3 ·(1-x)LiMO 2 [0<x<1, M=one or more of Ni, Co, Mn, Al, V, Cr, Fe] is considered to be the most promising cathode due to its high specific capacity (~300mAh / g) Material. ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 陈橙张鹏
Owner 桑德新能源技术开发有限公司
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