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Preparation method for titanium-coated ternary cathode material

A cathode material and wrapping technology, which is applied in the field of preparation of titanium-wrapped ternary cathode materials, can solve the problems of lithium-ion battery discharge specific capacity decay, easy damage to the structure of lithium-nickel-cobalt-manganese ternary cathode materials, and increase of impurity lithium content, etc. To achieve the effect of being beneficial to solution exchange and ion transfer, strong practicality and versatility, and speeding up the reaction speed

Active Publication Date: 2017-09-26
宝鸡钛普锐斯钛阳极科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, coating the crystalline lithium fast ion conductor on the surface of the lithium-nickel-cobalt-manganese ternary positive electrode material needs to be processed at a temperature higher than 750°C. When coating at this high temperature, the content of impurity lithium on the surface will increase rapidly. , and it is easy to destroy the structure of the lithium-nickel-cobalt-manganese ternary cathode material, resulting in a rapid decline in the discharge specific capacity of the prepared lithium-ion battery at the end of the cycle.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of a titanium-wrapped ternary cathode material, the steps of which are as follows:

[0025] Step 1, putting lithium chloride, nickel chloride, manganese chloride and cobalt chloride into an aqueous solution, adding an acidic agent and a stabilizer, stirring evenly to obtain a metal mixture;

[0026] Step 2, slowly adding ammonium carbonate to the metal mixed solution, while performing a slight thermal reaction to obtain a precipitation mixed solution;

[0027] Step 3, filtering the precipitation mixture, washing it, and drying it to obtain a mixed metal precipitate;

[0028] Step 4, mixing and stirring the mixed metal precipitates with nano-titanium dioxide until they are evenly mixed, then putting them into a reaction kettle, sealing and pressurizing for 3 hours to obtain titanium-doped mixed metal oxides;

[0029] Step 5, immersing the mixed oxide metal into the alcohol solution of n-butyl titanate, sealing and aeration reaction for 1 hour, and t...

Embodiment 2

[0043] A preparation method of a titanium-wrapped ternary cathode material, the steps of which are as follows:

[0044] Step 1, putting lithium chloride, nickel chloride, manganese chloride and cobalt chloride into an aqueous solution, adding an acidic agent and a stabilizer, stirring evenly to obtain a metal mixture;

[0045] Step 2, slowly adding ammonium carbonate to the metal mixed solution, while performing a slight thermal reaction to obtain a precipitation mixed solution;

[0046] Step 3, filtering the precipitation mixture, washing it, and drying it to obtain a mixed metal precipitate;

[0047] Step 4, mixing and stirring the mixed metal precipitate and nano-titanium dioxide until the mixture is uniform, then putting it into a reaction kettle, sealing and pressurizing for 3-8 hours to obtain titanium-doped mixed metal oxide;

[0048] Step 5, soaking the mixed oxide metal into the alcohol solution of n-butyl titanate, sealing and aeration reaction for 2 hours, and then f...

Embodiment 3

[0062] A preparation method of a titanium-wrapped ternary cathode material, the steps of which are as follows:

[0063] Step 1, putting lithium chloride, nickel chloride, manganese chloride and cobalt chloride into an aqueous solution, adding an acidic agent and a stabilizer, stirring evenly to obtain a metal mixture;

[0064] Step 2, slowly adding ammonium carbonate to the metal mixed solution, while performing a slight thermal reaction to obtain a precipitation mixed solution;

[0065] Step 3, filtering the precipitation mixture, washing it, and drying it to obtain a mixed metal precipitate;

[0066] Step 4, mixing and stirring the mixed metal precipitates with nano-titanium dioxide until they are evenly mixed, then putting them into a reaction kettle, sealing and pressurizing for 5 hours to obtain titanium-doped mixed metal oxides;

[0067] Step 5, soaking the mixed oxide metal into the alcohol solution of n-butyl titanate, sealing and aeration reaction for 2 hours, and th...

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Abstract

The invention discloses a preparation method for a titanium-coated ternary cathode material. The preparation method comprises the following steps: taking lithium chloride, nickel chloride, manganese chloride and cobalt chloride as raw materials, and forming metal carbonate precipitate by taking ammonium carbonate as a precipitating agent; sealing, pressurizing and reacting through nano-titanium dioxide, and performing organic titanium aerating and sintering reaction to obtain the titanium-coated ternary cathode material; finally, obtaining the titanium-coated ternary cathode material in an active state under the action of ultraviolet activation. The ternary cathode material prepared by the invention has the advantages of stable charging and discharging circulation, high-temperature stability, low cost, low environmental pollution and the like.

Description

technical field [0001] The invention belongs to the technical field of ternary positive electrode materials, and in particular relates to a preparation method of titanium-wrapped ternary positive electrode materials. Background technique [0002] Lithium-nickel-cobalt-manganese ternary cathode materials have attracted extensive attention from researchers due to their advantages such as high discharge specific capacity, good safety, and low price. However, compared with the lithium cobaltate cathode material, the lithium nickel cobalt manganese ternary cathode material has a higher content of nickel atoms and occupies the position of lithium atoms, resulting in more free lithium impurities on the surface. Under high temperature conditions, Lithium impurities and the electrolyte are prone to react to generate gas, which will lead to flatulence and deformation of lithium-ion batteries, which poses a great safety hazard. At the same time, due to the existence of high-valent nic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/62
CPCH01M4/485H01M4/626Y02E60/10
Inventor 方泽波黄俊杰
Owner 宝鸡钛普锐斯钛阳极科技有限公司
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