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In-situ functional coated positive electrode material, preparation method thereof and all-solid-state lithium battery

A positive electrode material and positive active material technology, applied in the field of all-solid-state lithium batteries, can solve problems such as poor interface compatibility, poor electrochemical reaction at the interface, poor contact, etc., and achieve low impedance, good practical industrial application prospects, and controllable thickness Effect

Active Publication Date: 2022-02-01
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a positive electrode material with in-situ functional coating and its preparation method and all-solid lithium battery, to solve the problem of all-solid-state batteries in the prior art Poor solid-solid interfacial contact between positive electrode materials and solid electrolytes, poor interfacial compatibility, and poor electrochemical reactions at the interface

Method used

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  • In-situ functional coated positive electrode material, preparation method thereof and all-solid-state lithium battery
  • In-situ functional coated positive electrode material, preparation method thereof and all-solid-state lithium battery
  • In-situ functional coated positive electrode material, preparation method thereof and all-solid-state lithium battery

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Embodiment 1

[0045] This embodiment provides an in-situ functionally coated positive electrode material and a preparation method thereof, wherein the positive electrode active material is polycrystalline NCM811 with a particle size of 10 μm, and the composition of the in-situ functional coating layer is Li 2 CO 3 , with a thickness of 8nm. Concrete preparation comprises the following steps:

[0046] The precursor of the positive electrode active material NCM811 was mixed with an excess of 15% Li 2 CO 3 Lithium salts were evenly mixed, and sintered at 700°C for 10 hours in an air atmosphere, Li 2 CO 3 Part of the lithium salt participated in the synthesis of the positive electrode active material NCM811, and part of the in-situ generation of thin and uniform Li on its surface 2 CO 3 The coating layer forms a positive electrode material with an in-situ generated functional coating layer on the surface.

Embodiment 2

[0048] This embodiment provides an in-situ functionally coated positive electrode material and a preparation method thereof, wherein the positive electrode active material is polycrystalline NCM811 with a particle size of 10 μm, and the composition of the in-situ functional coating layer is Li 2 O, with a thickness of 8 nm. Concrete preparation comprises the following steps:

[0049] The precursor of the positive electrode active material NCM811 was mixed with an excess of 15% LiOH·H 2 O lithium salts were evenly mixed, and sintered at 750°C in an oxygen atmosphere for 15 hours, LiOH·H 2 Part of the O lithium salt participated in the synthesis of the positive electrode active material NCM811, and part of the in-situ generation of thin and uniform Li on its surface 2 O coating layer, forming a positive electrode material with an in-situ-generated functional coating layer on the surface.

Embodiment 3

[0051] This embodiment provides an in-situ functionally coated positive electrode material and a preparation method thereof, wherein the positive electrode active material is polycrystalline NCM811 with a particle size of 10 μm, and the composition of the in-situ functional coating layer is Li 2 O-oxygen vacancies with a thickness of 8 nm. Concrete preparation comprises the following steps:

[0052] (1) The precursor of the positive electrode active material NCM811 was mixed with an excess of 15% LiOH·H 2 O lithium salts were evenly mixed, and sintered at 720°C in an oxygen atmosphere for 12h, LiOH·H 2 Part of the O lithium salt participated in the synthesis of the positive electrode active material NCM811, and part of the in-situ generation of thin and uniform Li on its surface 2 O coating layer, forming a positive electrode material with an in-situ-generated functional coating layer on the surface.

[0053] (2) The product obtained in step (1) was further sintered at 900 ...

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Abstract

The invention discloses an in-situ functional coated positive electrode material, a preparation method thereof and an all-solid-state lithium battery, and belongs to the field of all-solid-state lithium batteries. The positive electrode material comprises a positive electrode active material and a functional coating layer generated on the surface of the positive electrode active material in situ, the component of the coating layer is Li2O, Li2CO3 or Li2OLi2CO3, and all the components have the functions of Li < + > transmission, bidirectional interface compatibility and structural stability. A precursor of the positive electrode active material and excessive lithium salt are uniformly mixed and sintered, part of the lithium salt participates in synthesis of the positive electrode material, part of the lithium salt generates the thin and uniform functional coating layer in situ on the surface of the positive electrode material; further high-temperature sintering can be performed to enable the coating layer to generate oxygen vacancies and increase the Li < + > transmission property, or low-temperature sintering can be performed to form a composite coating layer. When the positive electrode material is used for assembling the all-solid-state lithium battery, the problem of a solid-solid interface in the all-solid-state lithium battery is solved, and the multiplying power and the cycle performance are improved. Meanwhile, the thickness of the coating layer is controllable, the preparation process is simple, expensive equipment is not needed, and batch production can be expanded.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for all-solid lithium batteries, in particular to an in-situ functionally coated positive electrode material, a preparation method thereof, and an all-solid lithium battery. Background technique [0002] Traditional liquid lithium-ion batteries use flammable organic electrolytes, which are prone to problems such as leakage and flatulence, and even have serious safety hazards such as battery explosion and fire. All-solid-state lithium batteries use non-flammable inorganic solid-state electrolytes to transport lithium ions, and have high energy density and safety. They are an important research direction for the development of electronics and electric vehicles in the future. [0003] In all-solid-state batteries, the interface between the electrode and the electrolyte is usually a key issue restricting its development, especially the space charge layer between the positive elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/052H01M10/0562H01M10/058C01B25/45C01D15/02C01D15/08C01G45/12C01G51/00C01G53/00
CPCH01M4/62H01M10/058H01M10/052H01M10/0562C01D15/02C01D15/08C01B25/45C01G51/42C01G53/42C01G45/1228C01G53/44C01G53/66C01G53/50Y02E60/10Y02P70/50
Inventor 李平史洁韩坤王振
Owner UNIV OF SCI & TECH BEIJING
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