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Single-crystal ternary cathode material, preparation method thereof and lithium ion battery

A cathode material, single crystal technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of low specific capacity of ternary lithium-ion batteries, complex process, unsatisfactory particle uniformity and electric specific capacity of ternary cathode materials And other issues

Active Publication Date: 2017-12-15
SHENZHEN DYNANONIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, to provide a single crystal ternary positive electrode material and its preparation method, to solve the complex process of preparing ternary positive electrode materials by the existing co-precipitation method, and to prepare the ternary positive electrode materials Technical problems of unsatisfactory particle uniformity and electrical specific capacity
[0008] Another object of the present invention is to provide a lithium ion battery to solve the technical problem of low specific capacity of the existing ternary lithium ion battery

Method used

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  • Single-crystal ternary cathode material, preparation method thereof and lithium ion battery
  • Single-crystal ternary cathode material, preparation method thereof and lithium ion battery

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preparation example Construction

[0022] On the one hand, an embodiment of the present invention provides a method for preparing a single crystal ternary cathode material. The technological process of the preparation method of the single crystal ternary positive electrode material is as follows figure 1 As shown, it includes the following steps:

[0023] Step S01. Prepare a mixture solution of ternary source materials: prepare a mixture solution of lithium source, nickel source, cobalt source, manganese source and complexing agent;

[0024] Step S02. Prepare a ternary precursor from a mixture solution of a ternary source material: perform complex crystallization on the mixture solution to obtain a precursor of a single crystal ternary cathode material;

[0025] Step S03. Sintering the precursor.

[0026] Specifically, in the above step S01, as an embodiment of the present invention, when preparing the mixture solution of the ternary source material, the molar ratio of the lithium source, the nickel source, t...

Embodiment 1

[0038] This embodiment provides a single crystal ternary cathode material and a preparation method thereof. The preparation method of the single crystal ternary cathode material comprises the following steps:

[0039] S11: Lithium carbonate, nickel sulfate, cobalt sulfate, manganese sulfate and ethylenediamine are formulated into a mixture solution according to the molar ratio of 1.05:0.5:0.3:0.2:0.6, the solvent is deionized water, and the concentration of the mixture solution is 1.5mol / L ;

[0040] S12: heat and concentrate at 140°C prepared in step S11 for recrystallization, obtain the precursor after centrifugation to remove the solvent, and dry at 180°C;

[0041] S13: Sintering the precursor prepared in step S12 according to the following conditions:

[0042] Firstly, the temperature is raised to 300°C at 3°C / min, and after heat preservation treatment for 3 hours, then the temperature is raised to 950°C at 20°C / min for 15 hours of heat preservation and sintering.

Embodiment 2

[0044] This embodiment provides a single crystal ternary cathode material and a preparation method thereof. The preparation method of the single crystal ternary cathode material comprises the following steps:

[0045] S21: Lithium hydroxide, nickel acetate, cobalt acetate, manganese acetate and ethylenediamine are formulated into a mixture solution according to the molar ratio of 1.06:0.5:0.3:0.2:1, the solvent is ethylene glycol solution, and the concentration of the mixture solution is 1.6mol / L;

[0046] S22: Perform solvothermal treatment at 180° C. and a pressure of 4 mPa in a closed reaction kettle prepared in step S21 for 15 hours, then remove the solvent by suction filtration to obtain the precursor, and dry it at 140° C.;

[0047] S23: Sintering the precursor prepared in step S22 according to the following body conditions:

[0048] First, the temperature is raised to 350°C at 5°C / min, and after heat preservation treatment for 2 hours, then the temperature is raised ...

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Abstract

The invention discloses a single-crystal ternary cathode material, a preparation method thereof and a lithium ion battery. The preparation method of the single-crystal ternary cathode material comprises the following steps: preparing a mixture solution of ternary source materials; preparing a ternary precursor from the mixture solution of the ternary source materials; sintering the precursor. The single-crystal ternary cathode material is used as a cathode material of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a single crystal ternary positive electrode material, a preparation method thereof and a lithium ion battery. Background technique [0002] As a new type of green power supply, lithium-ion batteries have the advantages of high specific energy, small self-discharge, high open circuit voltage, no memory effect, long cycle life, and no environmental pollution. Therefore, they are widely used as mobile phones, notebook computers, digital cameras, etc. At the same time, lithium-ion batteries are also power sources for electric vehicles and energy storage power sources for solar renewable energy. [0003] The core link in the lithium-ion battery industry is the manufacture of battery materials. The performance of batteries depends to a large extent on the performance of cathode materials. Among them, nickel-cobalt-manganese ternary materials are one of the hot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M10/0525
CPCH01M4/364H01M4/38H01M10/0525Y02E60/10
Inventor 孔令涌尚伟丽陈俊奇李洁凤
Owner SHENZHEN DYNANONIC
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