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Method for improving ternary lithium battery positive-electrode material temperature resistance by evaporating aluminum fluoride

A technology of ternary lithium battery and positive electrode material, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as unfavorable large-scale industrial production, uneven coating layer, long coating cycle, etc., and achieve the cost of raw materials and The effect of low equipment cost, simple process and improved high temperature resistance

Active Publication Date: 2017-06-13
东营睿港管道工程有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the present invention proposes a method of vapor-depositing aluminum fluoride to improve the temperature resistance of the positive electrode material of the ternary lithium battery, which overcomes the inhomogeneous coating obtained by using aluminum fluoride to coat through a chemical reaction in the prior art, And the long coating cycle is not conducive to the technical defects of large-scale industrial production. The coating effect of the present invention is good, the preparation method is simple, and the cost of raw materials and equipment used is low, which can meet the needs of industrial development

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Add aluminum fluoride raw material at the bottom of the fluidized bed, the particle size of the aluminum fluoride used is 6nm, vacuumize the fluidized bed chamber, and keep the vacuum degree of the chamber at 10 -3 Pa, set the bed temperature to 700°C, and control the bed temperature rise rate to 2°C / min, so that the aluminum fluoride sublimates and enters the high-temperature aluminum fluoride gas phase region;

[0025] (2) The nickel-cobalt-lithium-manganese-oxide ternary powder material is taken according to the mass ratio of aluminum fluoride to the nickel-cobalt-lithium-manganese-oxide ternary powder material at a mass ratio of 10:1, and the particle size of the nickel-cobalt-lithium-manganese-oxide ternary powder material is The ternary powder material of nickel cobalt lithium manganese oxide is added to the fluidized bed by the feeding mechanism, and the nitrogen gas with a purity of 99.99% is heated to 30°C and sent to the bottom of the fluidized bed by a blo...

Embodiment 2

[0029] (1) Add aluminum fluoride raw material at the bottom of the fluidized bed, the particle size of the aluminum fluoride used is 10nm, vacuumize the fluidized bed chamber, and keep the vacuum degree of the chamber at 10 -3 Pa, set the bed temperature to 700°C, and control the bed temperature rise rate to 4°C / min, so that the aluminum fluoride sublimates and enters the high-temperature aluminum fluoride gas phase region;

[0030] (2) The nickel-cobalt-lithium-manganese-oxide ternary powder material is taken according to the mass ratio of aluminum fluoride and the nickel-cobalt-lithium-manganese-oxide ternary powder material at a mass ratio of 12:1, and the particle size of the nickel-cobalt-lithium-manganese-oxide ternary powder material is The ternary powder material of nickel cobalt lithium manganese oxide is added into the fluidized bed by the feeding mechanism, and the helium gas with a purity of 99.0% is heated to 40°C and sent to the bottom of the fluidized bed by a bl...

Embodiment 3

[0034] (1) Add aluminum fluoride raw material at the bottom of the fluidized bed, the particle size of the aluminum fluoride used is 10nm, vacuumize the fluidized bed chamber, and keep the vacuum degree of the chamber at 10 -2 Pa, set the bed temperature to 730°C, and control the bed temperature rise rate to 6°C / min, so that the aluminum fluoride sublimates and enters the high-temperature aluminum fluoride gas phase region;

[0035] (2) The nickel-cobalt-lithium-manganese-oxide ternary powder material is taken according to the mass ratio of aluminum fluoride to the nickel-cobalt-lithium-manganese-oxide ternary powder material at a mass ratio of 13:1, and the particle size of the nickel-cobalt-lithium-manganese-oxide ternary powder material is The ternary powder material of nickel cobalt lithium manganese oxide is added to the fluidized bed by the feeding mechanism, and the nitrogen gas with a purity of 99.5% is heated to 30°C and sent to the bottom of the fluidized bed by a blo...

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Abstract

The invention discloses a method for improving ternary lithium battery positive-electrode material temperature resistance by evaporating aluminum fluoride. According the method, a fluidized bed serves as an evaporation device, the aluminum fluoride is sublimated, nano-scale nickel and cobalt lithium manganate ternary materials and the aluminum fluoride are evaporated in a contacting and suspending manner in the sublimating atmosphere of the aluminum fluoride, an ultrathin aluminum fluoride protection film uniformly wraps the surfaces of micro-particles of the nano-scale nickel and cobalt lithium manganate ternary materials after the materials are cooled, and the high-temperature resistance of nickel and cobalt lithium manganate is improved to 300 DEG C by wrapping the aluminum fluoride. By the aid of a pure physical coating mode, the method overcomes the technical shortcomings that a coating layer acquired by chemical coating of the aluminum fluoride is nonuniform, battery efficiency is affected, effect processing period is long, cost is high, pollution exists and the like in the prior art. The method is good in coating effect and simple in preparation process and can achieve large-scale industrial production modes.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a method for improving the temperature resistance of anode materials of ternary lithium batteries by vapor-depositing aluminum fluoride. Background technique [0002] After a long period of rapid development, lithium-ion batteries have made a series of great advances and are considered to be one of the most potential energy sources for electric vehicles. Ternary material LiNi with layered structure 1 / 3 co 1 / 3 mn 1 / 3 o 2 Due to the advantages of high discharge capacity, good safety performance, good structural stability, and low cost, it is considered to be one of the best choices for lithium-ion battery cathode materials as the energy source of electric vehicles. The ternary lithium material will decompose at about 200°C, and the chemical reaction of the ternary lithium material will be more intense, releasing oxygen molecules, causing the electrolyte to burn rapidly under hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 陈庆王镭迪曾军堂
Owner 东营睿港管道工程有限责任公司
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