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Method for preparing low-particle size ternary cathode material

A technology of positive electrode material and particle size, which is applied in the field of preparation of low particle size ternary positive electrode materials, can solve problems such as uneven distribution, uneven particle size, unstable electrochemical performance, etc., to achieve improved performance efficiency and strong activity , The preparation method is simple and feasible

Inactive Publication Date: 2017-09-05
ZHEJIANG IND POLYTECHNIC COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most common composition now in the literature is LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Ternary cathode material, however, the current preparation method has problems such as uneven particle size and uneven distribution, which lead to unstable electrochemical performance

Method used

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  • Method for preparing low-particle size ternary cathode material

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Embodiment 1

[0024] A preparation method of a low particle size ternary positive electrode material, the steps are as follows:

[0025] Step 1, dissolving lithium acetate, nickel acetate, cobalt acetate and manganese acetate in absolute ethanol, adding polyvinylpyrrolidone to seal and heat for 2 hours to obtain an encapsulated metal ion sol;

[0026] Step 2, the sol solution is added to the reactor and distilled under reduced pressure until a viscous solution is formed;

[0027] Step 3, add acetic acid and ethyl acetate to the viscous liquid, reflux for 10 hours, remove the ethyl acetate layer after cooling, obtain the acetic acid layer, and obtain a mixed acetic acid solution;

[0028] Step 4, adding distilled water to the mixed acetic acid solution, and then distilling off the acetic acid with slight heat to obtain a mixed aqueous solution;

[0029] Step 5, injecting carbon dioxide into the mixed aqueous solution, and circulating the aeration reaction to form sediment until the sediment...

Embodiment 2

[0039] A preparation method of a low particle size ternary positive electrode material, the steps are as follows:

[0040] Step 1, dissolving lithium acetate, nickel acetate, cobalt acetate and manganese acetate in absolute ethanol, adding polyvinylpyrrolidone to seal and heat for reaction for 4 hours, to obtain an encapsulated metal ion sol;

[0041] Step 2, the sol solution is added to the reactor and distilled under reduced pressure until a viscous solution is formed;

[0042] Step 3, add acetic acid and ethyl acetate to the viscous liquid, reflux for 15 hours, remove the ethyl acetate layer after cooling, obtain the acetic acid layer, and obtain a mixed acetic acid solution;

[0043]Step 4, adding distilled water to the mixed acetic acid solution, and then distilling off the acetic acid with slight heat to obtain a mixed aqueous solution;

[0044] Step 5, injecting carbon dioxide into the mixed aqueous solution, and circulating the aeration reaction to form sediment until...

Embodiment 3

[0054] A preparation method of a low particle size ternary positive electrode material, the steps are as follows:

[0055] Step 1, dissolving lithium acetate, nickel acetate, cobalt acetate and manganese acetate in absolute ethanol, adding polyvinylpyrrolidone and sealing and heating for 3 hours to obtain an encapsulated metal ion sol;

[0056] Step 2, the sol solution is added to the reactor and distilled under reduced pressure until a viscous solution is formed;

[0057] Step 3, add acetic acid and ethyl acetate to the viscous liquid, reflux for 13 hours, remove the ethyl acetate layer after cooling, obtain the acetic acid layer, and obtain a mixed acetic acid solution;

[0058] Step 4, adding distilled water to the mixed acetic acid solution, and then distilling off the acetic acid with slight heat to obtain a mixed aqueous solution;

[0059] Step 5, injecting carbon dioxide into the mixed aqueous solution, and circulating the aeration reaction to form sediment until the s...

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Abstract

The invention discloses a method for preparing a low-particle size ternary cathode material. The method comprises the following steps: by taking lithium chloride, nickel chloride, cobalt chloride and aluminum chloride as raw materials, and polyvinylpyrrolidone as a dispersing agent, dissolving in absolute ethyl alcohol, performing sealed heating reaction so as to obtain a coated gel liquid, performing reduced pressure distillation and laminated backflow reaction so as to obtain an acetic acid liquid, further adding distilled water, distilling acetic acid so as to obtain a mixed solution, performing aeration reaction so as to obtain metal precipitate, washing with acetone, and sintering with a protection gas, thereby obtaining the ternary cathode material. By adopting a mode that the particle size of the metal oxide is reduced, the performance efficiency of the ternary cathode material prepared by using the method is effectively improved, and meanwhile the ternary cathode material is good in circulation property, high in capacity and good in activity.

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 low particle size ternary positive electrode materials. Background technique [0002] In recent years, in response to the negative impacts such as environmental pollution and the sharp consumption of oil resources brought about by the rapid development of the automobile industry, countries are actively conducting research on electric vehicles (EV) and hybrid electric vehicles (HEV) using clean energy. Among them, the power battery as vehicle power has become the main bottleneck in the development of EV and HEV. [0003] Commercial lithium-ion batteries mainly use LiCoO 2 As a cathode material, LiCoO 2 There are safety and overcharge resistance problems, Co is a rare resource, the price is expensive, and the metal cobalt is easy to pollute the environment. while LiNiO 2 Poor stability, easy to cause safety proble...

Claims

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Application Information

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IPC IPC(8): H01M4/36
CPCH01M4/364Y02E60/10
Inventor 祝良荣杨建青
Owner ZHEJIANG IND POLYTECHNIC COLLEGE
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