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Ternary lithium ion storage battery positive electrode material and preparation method thereof

A cathode material, battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of unstable cycle, large irreversible capacity loss, etc., to improve the structure of ternary materials, shorten the preparation time, and improve the cycle life. Effect

Inactive Publication Date: 2021-03-09
SHUANGDENG GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The three elements of Co, Ni and Mn all belong to the transition metal elements of the fourth period, and the ionic radius, electron arrangement outside the nucleus, crystal structure and physical and chemical properties are very close, so α-NaFeO4 layered solid solution can be formed in any proportion; lithium-rich The layered oxide cathode material has the advantages of high specific capacity, low price, environmental friendliness and no pollution. When the charging voltage range of this material is 2-4.6V or 2-4.8V, the discharge specific capacity is high, which can exceed 200mAhg -1 , but the material has the disadvantages of large irreversible capacity loss for the first time and unstable cycle.

Method used

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  • Ternary lithium ion storage battery positive electrode material and preparation method thereof
  • Ternary lithium ion storage battery positive electrode material and preparation method thereof

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Embodiment 1

[0020] In this embodiment, the positive electrode material of the ternary lithium-ion battery is a lithium-rich layered oxide, and its chemical formula is Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 o 2 .

[0021] (1) Take M(Ac)·4H 2 O(M=Ni, Mn, Co), LiAc·H 2 O is the stoichiometric ratio of raw materials, wherein Li:Mn:Co:Ni=1.20:0.54:0.13:0.13. Add absolute ethanol to fully dissolve.

[0022] (2) Ignite the fully dissolved solution with alcohol in an open place or in a high-temperature box, and after fully burning, a purple precursor is obtained.

[0023] (3) Grinding and sieving the precursor obtained in (2).

[0024] (4) The powder obtained by sieving is placed in a tube furnace, and air is introduced, and the temperature is raised from room temperature to 550°C at a rate of 1°C / min, and the temperature is kept at a constant temperature for 5 hours. .

[0025] (5) Cool naturally to 60°C, take out, grind and sieve.

Embodiment 2

[0027] This embodiment is basically the same as Embodiment 1, and its distinguishing feature is that: the positive electrode material of the ternary lithium-ion battery is a lithium-rich layered oxide, and its chemical formula is Li 1.15 Mn 0.55 Ni 0.15 Co 0.15 o 2 .

[0028] Li:Mn:Co:Ni=1.15:0.55:0.15:0.15.

[0029] figure 1 For the preparation of Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 o 2 The XRD pattern of the material, it can be seen from the figure that both materials are α-NaFeO 4 Structure, 006 / 012 and 018 / 110 peaks have obvious splitting, which is a typical feature of layered structure, indicating that the positive electrode material obtained by this method maintains a typical layered structure, complete material structure, and good crystal form.

[0030] figure 2 For the preparation of Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 o 2 The SEM image of the material, it can be seen from the figure that these three materials are also composed of lumps and irregular small part...

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Abstract

The invention relates to the field of ternary lithium ion storage batteries, in particular to a ternary lithium ion storage battery positive electrode material and a preparation method thereof. The preparation method of the specific positive electrode material comprises the following steps: 1) mixing M (Ac).4H2O (M = Ni, Mn, Co) and LiAc.H2O as raw materials according to a stoichiometric ratio, adding absolute ethyl alcohol, and fully dissolving; 2) igniting the fully dissolved solution in an open place or a high-temperature box, and fully combusting to obtain a purple precursor; (3) grindingand sieving the precursor obtained in the step (2); 4) performing sieving to obtain powder, putting the powder into a tubular furnace, introducing air, heating from room temperature to 550 DEG C at aspeed of 1 DEG C / min, keeping the temperature constant for 5 hours, continuously performing heating to 800 DEG C at a speed of 2 DEG C / min, sintering, and keeping the temperature constant for 9 hours;5) performing natural cooling to 60 DEG C, taking out, grinding and sieving the material. In the invention, the positive electrode material is prepared by adopting an alcohol combustion method, so that the ternary material structure is improved, and the cycle life of the battery is prolonged; and the calcinations temperature requirements are reduced.

Description

technical field [0001] The invention relates to the field of ternary lithium ion storage batteries, in particular to a positive electrode material for a ternary lithium ion storage battery and a preparation method thereof. Background technique [0002] The three elements of Co, Ni and Mn all belong to the transition metal elements of the fourth period, and the ionic radius, electron arrangement outside the nucleus, crystal structure and physical and chemical properties are very close, so α-NaFeO4 layered solid solution can be formed in any proportion; lithium-rich The layered oxide cathode material has the advantages of high specific capacity, low price, environmental friendliness and no pollution. When the charging voltage range of this material is 2-4.6V or 2-4.8V, the discharge specific capacity is high, which can exceed 200mAhg -1 , but the material has the disadvantages of large irreversible capacity loss for the first time and unstable cycle. At present, the cycle lif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 张云云石玺司晓影陈厚勇卢珊珊
Owner SHUANGDENG GRP