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A rare earth composite metaphosphate coated lithium cathode material and preparation method thereof

A compound technology of metaphosphate and rare earth, applied in positive electrode, battery electrode, active material electrode, etc., can solve problems such as failure, unstable surface structure of lithium positive electrode materials, etc.

Active Publication Date: 2021-04-30
BEIJING TAIFENG XIANXING NEW ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, a large amount of Li escapes from the lattice, making the structure of the surface of the lithium cathode material more unstable, and it is easier to react with the electrolyte, resulting in failure.

Method used

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  • A rare earth composite metaphosphate coated lithium cathode material and preparation method thereof
  • A rare earth composite metaphosphate coated lithium cathode material and preparation method thereof
  • A rare earth composite metaphosphate coated lithium cathode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Weigh common three-element materials (Ni:Co:Mn=5:2:3) and 0.10LiPO 3 0.10 (Na 0.1 al 0.4 Nb 0.5 )(PO 3 ) 3.8 0.80Sc(PO 3 ) 3 , the quality of rare earth composite metaphosphate is 2.0% of common three-element materials, pour it into the material tank, add grinding balls, the amount of grinding balls added is 1 times the total mass of materials. Mix on a three-dimensional mixer for 1 hour. The mixed material was calcined in a muffle furnace at 700° C. and kept for 1 hour. The calcined block is ground and passed through a 300-mesh sieve to obtain a three-element material coated with rare earth composite metaphosphate.

Embodiment 2

[0046] Weigh common three-element materials (Ni:Co:Mn=5:2:3) and 0.10LiPO 3 0.10 (Na 0.1 al 0.5 Nb 0.5 )(PO 3 ) 3.8 0.80Y(PO 3 ) 3 , the quality of rare earth composite metaphosphate is 2.0% of common three-element materials, pour it into the material tank, add grinding balls, the amount of grinding balls added is 1 times the total mass of materials. Mix on a three-dimensional mixer for 1 hour. The mixed material was calcined in a muffle furnace at 700° C. and kept for 1 hour. The calcined block is ground and passed through a 300-mesh sieve to obtain a three-element material coated with rare earth composite metaphosphate.

Embodiment 3

[0048] Weigh common three-element materials (Ni:Co:Mn=5:2:3) and 0.10LiPO 3 0.10 (Na 0.1 al 0.5 Nb 0.5 )(PO 3 ) 3.8 0.80La(PO 3 ) 3 , the quality of rare earth composite metaphosphate is 1.0% of common three-element materials, pour it into the material tank, add grinding balls, the amount of grinding balls added is 1 times the total mass of materials. Mix on a three-dimensional mixer for 1 hour. The mixed material was calcined in a muffle furnace at 700° C. and kept for 1 hour. The calcined block is ground and passed through a 300-mesh sieve to obtain a three-element material coated with rare earth composite metaphosphate.

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Abstract

The invention provides a rare earth composite metaphosphate-coated lithium positive electrode material and a preparation method thereof, comprising rare earth composite metaphosphate and lithium positive electrode material. Wherein, the chemical formula of the rare earth composite metaphosphate is xLiPO 3 ·yM(PO 3 ) m ·zR(PO 3 ) n , where M is one or more of Na, K, Mg, Ni, Ca, Sr, Ba, R is one or more of rare earth elements, Al, Ti, Ni, Mn, Zr, Nb, Hf, Ta Various, m is equal to the average valence state of element M, n is equal to the average valence state of element R, 0

Description

technical field [0001] The invention belongs to the field of lithium battery electrode materials, and relates to a preparation method of a rare earth composite metaphosphate-coated lithium cathode material. Background technique [0002] The layered lithium cathode material is currently the most well-studied and widely used cathode material for consumer lithium-ion batteries, such as LiCoO 2 , Li[Ni 0.5 co 0.2 mn 0.3 ]O 2 . In recent years, in order to meet the demand for higher energy density, the operating voltage of consumer lithium batteries has become higher and higher. LiNi with spinel structure 0.5 mn 1.5 o 4 Because of its higher discharge platform (~4.7V), it is considered to be a promising lithium cathode material. As the operating voltage increases, more Li is extracted / intercalated in the lattice, which requires lithium cathode materials to have good lithium ion transport properties. In addition, a large amount of Li escapes from the lattice, making the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/626H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 李淼武斌李钊华张继泉杨新河周恒辉
Owner BEIJING TAIFENG XIANXING NEW ENERGY TECH CO LTD