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Cerium phosphate coated ternary cathode material, preparation method thereof and lithium ion battery

A positive electrode material and ternary material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor cycle performance and rate performance, achieve good cycle performance and rate performance, reduce side reactions, and uniform coating Effect

Inactive Publication Date: 2019-06-18
PINGGAO GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of poor cycle performance and rate performance of coated ternary cathode materials in the prior art, the present invention provides a cerium phosphate-coated ternary cathode material

Method used

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  • Cerium phosphate coated ternary cathode material, preparation method thereof and lithium ion battery
  • Cerium phosphate coated ternary cathode material, preparation method thereof and lithium ion battery
  • Cerium phosphate coated ternary cathode material, preparation method thereof and lithium ion battery

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Embodiment 1

[0025] The cerium phosphate coated ternary positive electrode material of this embodiment is composed of a positive electrode material inner core and a cerium phosphate layer coated on the surface of the positive electrode material inner core; the positive electrode material is LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 ; The mass percentage of the cerium phosphate in the cerium phosphate-coated ternary positive electrode material is 1%.

[0026] The preparation method of the cerium phosphate-coated ternary positive electrode material of the present embodiment comprises the following steps:

[0027] 1) Weigh 0.192gCe(NO 3 ) 3 ·6H 2 O dissolved in a small amount of 10mL water, weighed 0.051g NH 4 h 2 PO 4 Dissolve in 10mL of water to prepare cerium nitrate solution and ammonium dihydrogen phosphate solution respectively;

[0028] Add 9.67g of positive electrode material into 50mL water, then stir at 500rpm for 1h, then add cerium nitrate solution, stir at 500rpm for 1h, then slowly ad...

Embodiment 2

[0032] The cerium phosphate-coated ternary positive electrode material of this embodiment is composed of a positive electrode material inner core and a cerium phosphate layer coated on the surface of the positive electrode material inner core; the positive electrode material is LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The mass percentage of the cerium phosphate in the cerium phosphate-coated ternary positive electrode material is 0.1%.

[0033] The preparation method of the cerium phosphate-coated ternary positive electrode material of the present embodiment comprises the following steps:

[0034] 1) Weigh 0.192gCe(NO 3 ) 3 ·6H 2 Dissolve O in 10mL water, weigh 0.051g NH 4 h 2 PO 4 Dissolve in 10mL of water to prepare cerium nitrate solution and ammonium dihydrogen phosphate solution respectively;

[0035] Add 99.9g of positive electrode material into 500mL of water, then stir at 700rpm for 0.5h, then add cerium nitrate solution, stir at 300rpm for 5h, then slowly add ammonium dihy...

Embodiment 3

[0039] The cerium phosphate-coated ternary positive electrode material of this embodiment is composed of a positive electrode material inner core and a cerium phosphate layer coated on the surface of the positive electrode material inner core; the positive electrode material is LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 ; The mass percent of the cerium phosphate in the cerium phosphate-coated ternary positive electrode material is 5%.

[0040]The preparation method of the cerium phosphate-coated ternary positive electrode material of the present embodiment comprises the following steps:

[0041] 1) Weigh 0.96gCe(NO 3 ) 3 ·6H 2 Dissolve O in 50mL water, weigh 0.255g NH 4 h 2 PO 4 Dissolve in 50mL water, and prepare cerium nitrate solution and ammonium dihydrogen phosphate solution respectively;

[0042] Add 9.88g of positive electrode material into 50mL of water, then stir at 300rpm for 2h, then add cerium nitrate solution, stir at 700rpm for 0.2h, then slowly add ammonium dihydrogen ...

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Abstract

The invention relates to a cerium phosphate coated ternary cathode material, a preparation method thereof and a lithium ion battery, and belongs to the technical field of cathode active substances forlithium ion batteries. The cerium phosphate coated ternary cathode material comprises a cathode material inner core and a cerium phosphate layer, wherein the surface of the cathode material inner core is coated with the cerium phosphate layer; the cathode material is a nickel cobalt lithium manganate ternary material; and the mass percentage of cerium phosphate accounts for 0.1-5% of the mass percentage of the cerium phosphate coated ternary cathode material. According to the cerium phosphate coated ternary cathode material, the surface of the nickel cobalt lithium manganate ternary cathode material is coated with the cerium phosphate layer, the cerium phosphate has the good lithium ion migration ability and the electron transfer ability, through physical coating, diffusion impedance andohmic impedance can be reduced, contact between the cathode material and an electrolyte can also be isolated, a side reaction between the material and the electrolyte is reduced, the crystal structureof the material is stabilized, the cycling performance and the rate performance of the material are improved, and the cycling life of the nickel-cobalt-manganese ternary cathode material is prolonged.

Description

technical field [0001] The invention relates to a cerium phosphate-coated ternary positive electrode material, a preparation method thereof, and a lithium ion battery, belonging to the technical field of positive electrode active materials of lithium ion batteries. Background technique [0002] In recent years, as electric vehicles have higher and higher requirements for the energy density of lithium-ion batteries, nickel-cobalt-manganese-manganese ternary lithium batteries have gradually become a research hotspot. Lithium-acid cathode materials have disadvantages such as low tap density, poor cycle performance and fast capacity decay under high-voltage and high-current discharge conditions, which limit the application range of this material. It has been reported in the literature that by forming a coating layer on the surface of the material, the interface reaction between the active cathode material and the electrolyte can be avoided, the structural damage to the active ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525
CPCY02E60/10
Inventor 张柳丽田刚领赵江涛李占军罗军李娟牛哲荟
Owner PINGGAO GRP
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