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Lithium-rich manganese-based composite positive electrode material and preparation method and application thereof

A composite positive electrode material, lithium-rich manganese-based technology, applied in the direction of positive electrodes, electrode manufacturing, battery electrodes, etc., can solve the low coulombic efficiency of lithium-rich manganese-based positive electrode materials for the first time, difficult to withstand cyclic working voltage, and hinder the commercialization process and other problems, to achieve the effect of stable cycle performance, high first-time efficiency, uniform and controllable thickness

Inactive Publication Date: 2020-11-24
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, lithium-rich manganese-based cathode materials have problems such as low initial Coulombic efficiency, poor rate performance, and cycle voltage decay, which seriously hinder the commercialization process.
At the same time, the working voltage of lithium-rich manganese-based cathode materials is high, and the commercialized liquid electrolyte is difficult to withstand the cyclic working voltage above 4.6V.
At present, most lithium-rich manganese-based cathode materials are used in liquid battery systems, so it is difficult to fully exert the advantages of high specific capacity of lithium-rich manganese-based cathode materials

Method used

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  • Lithium-rich manganese-based composite positive electrode material and preparation method and application thereof
  • Lithium-rich manganese-based composite positive electrode material and preparation method and application thereof
  • Lithium-rich manganese-based composite positive electrode material and preparation method and application thereof

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Effect test

Embodiment 1

[0057] The method for preparing lithium-rich manganese-based positive electrode materials is as follows:

[0058] (1) The lithium-rich manganese-based cathode material (chemical formula xLi 2 MnO 3 (1-x)LiMO 2 , where M is the same molar ratio of Ni, Co, Mn metal elements, and x is 0.5. ) mixed with samarium nitrate solution (concentration: 0.1mol / L) and ultrasonically dispersed to obtain a suspension, the mass ratio of the lithium-rich manganese-based positive electrode material to the samarium salt solution was 1:30;

[0059] (2) Mix the suspension obtained above with NaH 2 PO 4 After the solution (concentration is 0.1mol / L) is mixed, it is supplied to a hydrothermal tank for thermal reaction (temperature is 140°C, time is 8h), in which NaH 2 PO 4 The molar ratio to samarium nitrate is 1.2:1, forming a preliminary coating layer on the surface of the positive electrode material;

[0060] (3) Filter, wash, dry and calcinate the positive electrode material obtained in st...

Embodiment 2

[0067] The method for preparing lithium-rich manganese-based positive electrode materials is as follows:

[0068] (1) The lithium-rich manganese-based cathode material (chemical formula xLi 2 MnO 3 (1-x)LiMO 2 , wherein M is the same molar ratio of Ni, Co, Mn metal elements, and x is 0.5) mixed with samarium nitrate solution (concentration is 0.05mol / L) and ultrasonically dispersed to obtain a suspension;

[0069] (2) Mix the suspension obtained above with (NH 4 ) 2 HPO 4 The solution (concentration is 0.15mol / L) is mixed and supplied to a hydrothermal tank for thermal reaction (temperature is 120°C, time is 6h), wherein (NH 4 ) 2 HPO 4 The molar ratio with samarium nitrate is 1:1, forming a preliminary coating layer on the surface of the positive electrode material;

[0070] (3) Filtrate, wash, dry and calcinate the positive electrode material obtained in step (2) (calcination temperature is 650 degrees Celsius, time is 8 hours), to obtain lithium-rich manganese-based...

Embodiment 3

[0077] The method for preparing lithium-rich manganese-based positive electrode materials is as follows:

[0078] (1) The lithium-rich manganese-based cathode material (chemical formula xLi 2 MnO 3 (1-x)LiMO 2 , where M is the same molar ratio of Ni, Co, Mn metal elements, and x is 0.5. ) mixed with samarium chloride solution (concentration is 0.1mol / L) and ultrasonically dispersed to obtain a suspension;

[0079] (2) Mix the suspension obtained above with NH 4 h 2 PO 4 The solution (concentration is 0.1mol / L) is mixed and supplied to a hydrothermal tank for thermal reaction (temperature is 120°C, time is 8h), in which NH 4 h 2 PO 4 The molar ratio to samarium chloride is 1:1, forming a preliminary coating layer on the surface of the positive electrode material;

[0080] (3) Filter, wash, dry and calcinate the positive electrode material obtained in step (2) (calcination temperature is 500 degrees Celsius, time is 12 hours), to obtain lithium-rich manganese-based comp...

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Abstract

The invention discloses a lithium-rich manganese-based composite positive electrode material and a preparation method and application thereof. The lithium-rich manganese-based composite positive electrode material comprises an inner core and a coating layer, wherein the inner core comprises a lithium-rich manganese-based positive electrode material, the coating layer coats the inner core, and thecoating layer comprises samarium phosphate. The lithium-rich manganese-based composite positive electrode material has the advantages of high initial efficiency, good rate capability and stable cycleperformance. Therefore, a solid-state battery prepared from the lithium-rich manganese-based composite positive electrode material is good in electrochemical performance; and the advantages of high specific capacity and high working voltage of the lithium-rich manganese base and high safety, high energy density, wide electrochemical window and the like of the solid-state battery are combined, so that a vehicle loaded with the solid-state battery has excellent endurance, long cycle life and high safety.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a lithium-rich manganese-based composite positive electrode material and a preparation method and application thereof. Background technique [0002] The development of new lithium-ion batteries with high energy density is a common demand in the industry, and the specific capacity of the cathode material is one of the most critical factors affecting the energy density of the battery system. Therefore, current research focuses on the development of high specific capacity cathode materials with more active lithium that can be effectively utilized. The specific capacity of lithium-rich manganese-based cathode materials in the voltage range of 2.0-4.8V is as high as 250mAh / g, and can even reach 300mAh / g after optimization, which is much higher than the current commercial cathode materials (<210mAh / g). Due to the high manganese content and low cobalt content, the lith...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/04H01M4/131H01M10/0525B60L50/60
CPCB60L50/60H01M4/0471H01M4/131H01M4/624H01M4/628H01M10/0525H01M2004/028Y02E60/10Y02T10/70
Inventor 邓城邱昭政梁世硕
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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