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Preparation method and application of lithium ion battery positive electrode active material

A cathode active material, lithium-ion battery technology, applied in electrode manufacturing, battery electrode, electrolyte storage battery manufacturing and other directions, can solve the problems of difficult to put into actual production, high cost of preparation methods, inconsistent initial charge and discharge behavior, etc., to achieve reversible oxidation Reduction reaction, the method is simple and fast, and the effect of inhibiting interlayer migration

Active Publication Date: 2021-06-22
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Researchers have successfully prepared lithium-ion battery cathode materials with 02 metastable structure by molten salt ion exchange method, showing ultra-high specific capacity and good cycle stability, but the preparation method is expensive and difficult to put into practice Production, and the first charge and discharge behavior is also inconsistent

Method used

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  • Preparation method and application of lithium ion battery positive electrode active material
  • Preparation method and application of lithium ion battery positive electrode active material
  • Preparation method and application of lithium ion battery positive electrode active material

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preparation example Construction

[0040] A preparation method for a positive electrode active material of a lithium ion battery, comprising the following steps:

[0041] (1) Put a certain molar ratio of lithium salts, sodium salts and transition metal oxides in a mortar, add an appropriate amount of acetone or alcohol, and grind evenly until the organic solvent is completely volatilized;

[0042] Lithium salt is lithium hydroxide, lithium oxide or lithium carbonate, etc.; sodium salt is sodium hydroxide, sodium oxide or sodium carbonate, etc.; transition metal oxide is one or more of manganese oxide, nickel oxide and cobalt oxide; lithium The molar ratio of salt, sodium salt and transition metal oxide is (0.1~0.4):(0.5~1):(0.6~0.9);

[0043] (2) Collect the uniformly ground mixture in a crucible, calcinate it in a muffle furnace with a certain sintering system, and then cool it to room temperature to obtain the final product;

[0044] The sintering system is specifically calcined at 450-600°C for 4-8 hours, a...

Embodiment 1

[0051] Embodiment 1: a method for realizing the reversible redox of lithium-ion battery cathode material anion, comprising the following steps:

[0052] (1) Put lithium hydroxide, sodium carbonate, and manganese dioxide with a molar ratio of 0.2:0.6:0.8 in a mortar, add an appropriate amount of acetone or alcohol, and grind evenly until the organic solvent evaporates completely;

[0053] (2) The homogeneously ground mixture was collected in a crucible, heated in a muffle furnace at 450° C. for 5 h, then calcined at 800° C. for 12 h, and then cooled to room temperature.

[0054] (3) The positive electrode material, Super P, and PVDF are made into lithium-ion battery positive pole pieces with a mass fraction of 75%: 15%: 10%, and assembled into a button battery, wherein the electrolyte is lithium-ion battery electrolyte ( 1mol / L LiPF 6 Dissolved in the EC / DMC solution with a volume ratio of 1:1), the negative electrode is lithium metal;

[0055] (4) After the assembled battery...

Embodiment 2

[0056] Embodiment 2: a method for realizing the reversible redox of lithium-ion battery cathode material anions, comprising the following steps:

[0057] (1) Put lithium hydroxide, sodium carbonate, and manganese dioxide with a molar ratio of 0.33:1:0.66 in a mortar, add an appropriate amount of acetone or alcohol, and grind evenly until the organic solvent evaporates completely;

[0058] (2) The homogeneously ground mixture was collected in a crucible, heated in a muffle furnace at 450° C. for 5 h, then calcined at 850° C. for 12 h, and then cooled to room temperature.

[0059] (3) The positive electrode material, Super P, and PVDF are made into lithium-ion battery positive pole pieces with a mass fraction of 75%: 15%: 10%, and assembled into a button battery, wherein the electrolyte is lithium-ion battery electrolyte ( 1mol / L LiPF 6 Dissolved in the EC / DMC solution with a volume ratio of 1:1), the negative electrode is lithium metal;

[0060] (4) After the assembled batter...

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Abstract

The invention provides a preparation method and application of a lithium ion battery positive electrode active material, relates to the technical field of lithium ion batteries, and can realize reversible oxidation reduction of anions in a lithium ion battery positive electrode material and effectively inhibit oxygen loss of a lithium-rich manganese-based positive electrode material. The method comprises the following steps: S1, uniformly mixing a lithium salt, a sodium salt and a transition metal oxide according to a preset molar ratio to obtain a mixture; S2, calcining the mixture to obtain a first positive electrode material; S3, mixing the first positive electrode material, a conductive agent and a binder according to a predetermined mass fraction to prepare a second positive electrode material; S4, activating the second positive electrode material to obtain the final positive electrode active material of the lithium ion battery. The technical scheme provided by the invention is suitable for the preparation and application process of the lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method and application of a positive electrode active material of a lithium ion battery. Background technique [0002] Lithium-ion batteries have become the most widely used secondary batteries due to their high energy density and good cycle stability. Due to the low specific capacity and other issues, the cathode material of lithium-ion batteries has become a limiting link in the energy density of lithium-ion batteries. Traditional lithium-ion battery cathode materials, such as LiCoO 2 、LiFePO 4 、LiNi x co y mn 1-x-y o 2 Materials such as transition metal ions store and release charges, and their higher atomic weight and less electron capacity fundamentally limit the increase in specific capacity. While the current anion (O 2- , S 2- etc.) Energy storage has gradually attracted people's attention, and more and more research findings and advan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M4/04H01M10/058H01M10/0525
CPCH01M4/505H01M4/525H01M4/625H01M4/04H01M10/058H01M10/0525Y02P70/50Y02E60/10
Inventor 李建玲杨哲钟健健冯佳萌
Owner UNIV OF SCI & TECH BEIJING
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