Preparation method for hydrophobic conductive powder material coated composite ternary positive electrode material

A technology of conductive materials and positive electrode materials, applied in the direction of electrical components, battery electrodes, circuits, etc., can solve problems such as cycle performance not mentioned, achieve the effect of improving hydrophobic characteristics, improving safety performance, and reducing moisture

Inactive Publication Date: 2016-08-24
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although Chinese patent CN 104779377 A uses lithium iron manganese phosphate material and ternary compound to significantly improve its safety performance, it does not mention its cycle performance

Method used

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  • Preparation method for hydrophobic conductive powder material coated composite ternary positive electrode material

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Effect test

Embodiment 1

[0022] A method for preparing a composite ternary lithium-ion battery cathode material coated with a hydrophobic conductive powder material, comprising the following steps:

[0023] (1) The lithium iron manganese phosphate material and the hydrophobic conductive carbon fiber are in a mass ratio of 100:0.15, and are uniformly dispersed in an ethanol solution by ultrasonic dispersion to obtain a suspension;

[0024] (2) adopt centrifugal separation to carry out solid-liquid separation to suspension;

[0025] (3) heating the separated solid in a water bath at a temperature of 300°C for 6 hours to obtain a lithium iron manganese phosphate material coated with a hydrophobic conductive material;

[0026] (4) Combining lithium iron manganese phosphate material coated with hydrophobic conductive material and ternary cathode material LiNi 0.5 co 0.2 mn 0.3 o 2 The composite ternary lithium ion battery positive electrode material is obtained by compounding according to a mass ratio ...

Embodiment 2

[0032] A method for preparing a composite ternary lithium-ion battery cathode material coated with a hydrophobic conductive powder material, comprising the following steps:

[0033] (1) The lithium iron manganese phosphate material and the hydrophobic conductive carbon fiber or the hydrophobic carbon nanotube array film are uniformly dispersed in the ethanol solution by spray dispersion at a mass ratio of 100:0.01 to obtain a suspension;

[0034] (2) adopt suction filtration to carry out solid-liquid separation to the suspension;

[0035] (3) heating the separated solid in a water bath at a temperature of 700° C. for 4 hours to obtain a lithium iron manganese phosphate material coated with a hydrophobic conductive material;

[0036] (4) The lithium iron manganese phosphate material coated with the hydrophobic conductive material and the ternary positive electrode material Li (Ni 0.6 co 0.2 mn 0.6 )O 2 Compounding is carried out according to the mass ratio of 0.1 to prepare...

Embodiment 3

[0038] A method for preparing a composite ternary lithium-ion battery cathode material coated with a hydrophobic conductive powder material, comprising the following steps:

[0039] (1) The lithium iron manganese phosphate material and the hydrophobic conductive carbon fiber are in a mass ratio of 100:0.5, and are uniformly dispersed in the ethanol solution by mechanical stirring to obtain a suspension;

[0040] (2) adopt spray drying to carry out solid-liquid separation to the suspension;

[0041] (3) heating the separated solid in a water bath at a temperature of 500°C for 8 hours to obtain a lithium iron manganese phosphate material coated with a hydrophobic conductive material;

[0042] (4) The lithium iron manganese phosphate material coated with the hydrophobic conductive material and the ternary positive electrode material Li (Ni 0.3 co 0.3 mn 0.4 )O 2 The compound ternary lithium ion battery cathode material is prepared by compounding according to a mass ratio of 1...

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Abstract

The invention discloses a preparation method for a hydrophobic conductive powder material coated composite ternary positive electrode material. The preparation method comprises the following steps of uniformly dispersing lithium-manganese-iron-phosphate material and hydrophobic conductive material in an alcohol solution according to a mass ratio of 100:(0.01-0.5); carrying out solid-liquid separation on a suspension; carrying out water-bath heating on the separated solid to obtain a hydrophobic conductive material coated lithium-manganese-iron-phosphate material; and combining the hydrophobic conductive material coated lithium-manganese-iron-phosphate material and the ternary positive electrode material Li(Ni<x>Co<y>Mn<1-x-y>)O<2> according to a mass ratio of 0.1-1 to prepare the composite ternary positive electrode material of a lithium ion battery. By the preparation method, moisture before liquid injection of the composite ternary battery can be effectively reduced, the probability of generation of an acid by reaction of the moisture with an electrolyte is reduced, and the cycle lifetime of the composite ternary battery is effectively prolonged.

Description

[0001] technical field [0002] The invention belongs to the field of positive electrode materials of lithium ion batteries, and in particular relates to a preparation method of a composite ternary positive electrode material coated with a hydrophobic conductive powder material. Background technique [0003] Driven by the national new energy policy, higher requirements have been put forward for the specific energy of a car power battery. By the end of 2015, it will reach 200 Wh / kg, double that of 2010; by 2020, it will reach 300 Wh / kg. Ternary battery (ternary material: energy density is 220 Wh / kg) has become a research and development hotspot in the lithium battery industry, but its safety performance is still one of the most difficult problems to solve. The main measure currently taken is to compound lithium manganese oxide or lithium iron phosphate or lithium iron manganese phosphate with ternary materials in a certain proportion, so as to improve its safety performance. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 袁雪芹
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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