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Lithium manganese iron phosphate-based composite positive electrode material and preparation method thereof

A composite positive electrode material, lithium manganese iron phosphate technology, applied in the direction of battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of poor electrical conductivity, etc., to solve the problems of poor electrical conductivity, good cycle performance, and high energy density Effect

Inactive Publication Date: 2018-09-28
SHENZHEN DYNANONIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a lithium manganese iron phosphate-based composite positive electrode material and a preparation method thereof, aiming at solving the problem of lithium manganese iron phosphate LiFe 1-x mn x PO 4 (0

Method used

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  • Lithium manganese iron phosphate-based composite positive electrode material and preparation method thereof
  • Lithium manganese iron phosphate-based composite positive electrode material and preparation method thereof
  • Lithium manganese iron phosphate-based composite positive electrode material and preparation method thereof

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preparation example Construction

[0042] Correspondingly, combined with figure 1 The embodiment of the present invention also provides a method for preparing a lithium iron manganese phosphate-based composite cathode material, which includes the following steps:

[0043] S01. Provide crude nickel cobalt manganese oxide and / or nickel cobalt lithium aluminate, dispersed in a solvent for ball milling, and crushed the crude lithium cobalt manganate and / or nickel cobalt aluminate to obtain a particle size of 200 -500nm lithium nickel cobalt manganate and / or lithium nickel cobalt aluminate particles; provide lithium manganese iron phosphate particles, and obtain lithium iron manganese phosphate microspheres with a secondary particle size of 5-20um through spray drying;

[0044] S02 Weigh lithium nickel cobalt manganese oxide and / or lithium nickel cobalt aluminate particles and lithium iron manganese phosphate microspheres according to the raw material ratio of the foregoing lithium manganese iron phosphate-based composite...

Embodiment 1

[0057] A method for preparing lithium iron manganese phosphate-based composite cathode material includes the following steps:

[0058] S11. Provide crude nickel cobalt manganese oxide and / or nickel cobalt lithium aluminate, dispersed in a solvent for ball milling, ball milling the spherical ternary material into small particles of nickel and cobalt with a primary particle size of 200-500nm Lithium manganate and / or lithium nickel cobalt aluminate; provide lithium manganese iron phosphate particles, and obtain spherical granular lithium iron manganese phosphate with a secondary particle size of 5-20um through spray drying;

[0059] S12. Put the processed lithium nickel cobalt manganate and / or lithium nickel cobalt aluminate and lithium iron manganese phosphate according to the mass ratio of lithium nickel cobalt manganate and / or lithium nickel cobalt aluminate to lithium iron manganese phosphate as 1: The ratio of 99 is dispersed in the solvent to form a mixed liquid;

[0060] S13. Af...

Embodiment 2

[0063] A method for preparing lithium iron manganese phosphate-based composite cathode material includes the following steps:

[0064] S21. Provide crude nickel cobalt manganese oxide and / or nickel cobalt lithium aluminate, dispersed in a solvent for ball milling, ball milling the spherical ternary material into small particles of nickel and cobalt with a primary particle size of 200-500nm Lithium manganate and / or lithium nickel cobalt aluminate; provide lithium manganese iron phosphate particles, and obtain spherical granular lithium iron manganese phosphate with a secondary particle size of 5-20um through spray drying;

[0065] S22. Put the treated lithium nickel cobalt manganese oxide and / or lithium nickel cobalt aluminate and lithium iron manganese phosphate according to the mass ratio of lithium nickel cobalt manganate and / or lithium nickel cobalt aluminate to lithium iron manganese phosphate as 30: 70% dispersed in the solvent to form a mixed liquid;

[0066] S23. After the mi...

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Abstract

The invention provides a lithium manganese iron phosphate-based composite positive electrode material. The lithium manganese iron phosphate-based composite positive electrode material adopts a core-shell structure, and comprises an inner core formed by lithium manganese iron phosphate and an outer shell for coating the surface of the inner core; and the outer shell adopts the material of lithium nickel cobalt manganate and / or lithium nickel cobalt aluminate. The lithium manganese iron phosphate-based composite positive electrode material provided by the invention has high energy density, highlow-temperature performance, high rate discharge performance and high cycle performance.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium iron manganese phosphate-based composite cathode material and a preparation method thereof. Background technique [0002] As global energy and environmental issues are becoming more and more severe, vehicles are gradually switching to energy storage batteries as their main power source. As a high-performance secondary green battery, lithium-ion battery has high voltage, high energy density (including volume energy, mass specific energy), low self-discharge rate, wide operating temperature range, long cycle life, environmental protection, It has the advantages of no memory effect and high current charge and discharge, which is considered to be one of the best choices for high-energy, high-density, high-power and low-cost batteries. At present, one of the bottlenecks restricting the large-scale industrialization of lithium-ion batteries is cathode mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/505H01M4/525H01M4/485H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/5825H01M4/624H01M10/0525Y02E60/10
Inventor 孔令涌黄少真
Owner SHENZHEN DYNANONIC
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