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Rare earth composite metaphosphate coated lithium positive material and preparation method thereof

A metaphosphate and rare earth composite technology, applied in the direction of positive electrode, battery electrode, active material electrode, etc., can solve the problems of unstable surface structure and failure of lithium positive electrode material, achieve good cycle performance and thermal stability, production equipment Low requirements and the effect of improving electronic conductivity

Active Publication Date: 2019-07-26
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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  • Rare earth composite metaphosphate coated lithium positive material and preparation method thereof
  • Rare earth composite metaphosphate coated lithium positive material and preparation method thereof
  • Rare earth composite metaphosphate coated lithium positive material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Weighing 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, and the amount of grinding balls added is 1 times the total mass of the material. Mix on a 3D mixer for 1 hour. The mixed material was calcined in a muffle furnace at 700°C for 1 hour. The calcined block is ground and passed through a 300-mesh sieve to obtain a rare earth composite metaphosphate-coated tri-element material.

Embodiment 2

[0046] Weighing 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, and the amount of grinding balls added is 1 times the total mass of the material. Mix on a 3D mixer for 1 hour. The mixed material was calcined in a muffle furnace at 700°C for 1 hour. The calcined block is ground and passed through a 300-mesh sieve to obtain a rare earth composite metaphosphate-coated tri-element material.

Embodiment 3

[0048] Weighing 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, and the amount of grinding balls added is 1 times the total mass of the material. Mix on a 3D mixer for 1 hour. The mixed material was calcined in a muffle furnace at 700°C for 1 hour. The calcined block is ground and passed through a 300-mesh sieve to obtain a rare earth composite metaphosphate-coated tri-element material.

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Abstract

The invention provides a rare earth composite metaphosphate coated lithium positive material and a preparation method thereof. The rare earth composite metaphosphate coated lithium positive material comprises rare earth composite metaphosphate and a lithium positive material, wherein a chemical formula of the rare earth composite metaphosphate is xLiPO3.yM(PO3)m.zR (PO3)n; M is one or more of Na,K, Mg, Ni, Ca, Sr and Ba; R is one or more of a rare earth element, Al, Ti, Ni, Mn, Zr, Nb, Hf and Ta; m is equal to an average valence state of the element M; n is equal to an average valence state of the element R; x is greater than 0 and less than or equal to 0.50; y is greater than or equal to 0 and less than or equal to 0.50; z is greater than 0 and less than 1.0; and the sum of x, y and z isequal to 1. The rare earth composite metaphosphate is adopted as a coating material, so that the surface of the lithium positive material can be prevented from being corroded by an electrolyte, and the lithium positive material has better cycling performance and higher thermal stability under a voltage of 4.50V or even above. Meanwhile, the rare earth composite metaphosphate can generate a liquidglass phase, and is spread on the surface of the lithium positive material, so that the coating layer is more uniform.

Description

technical field [0001] The invention belongs to the field of lithium battery electrode materials, and relates to a preparation method of a lithium positive electrode material coated with a rare earth composite metaphosphate. Background technique [0002] Lithium cathode materials with layered structure are currently the most well-studied and widely used cathode materials 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 is getting 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 the lithium cathode material to have good lithium ion transport properties. In addition, a large amount of Li i...

Claims

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Application Information

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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
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