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Lithium/sodium dual-ion manganese-based oxide positive electrode material and preparation method and application thereof

A technology of manganese-based oxides and positive electrode materials, which is applied in the direction of battery electrodes, electrochemical generators, electrical components, etc., can solve the problems of low initial efficiency, initial charge and discharge efficiency of materials, and cycle stability, etc., to achieve convenient operation, Effect of improving discharge specific capacity and cycle stability, good discharge specific capacity and cycle stability

Inactive Publication Date: 2018-01-16
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although lithium / sodium double-ion manganese-based oxide cathode materials have many advantages, there are also some disadvantages in the actual application process, such as low initial efficiency, discharge platform (3.7V vs. Li + / Li or so) is lower than lithium cobalt oxide (3.9V), and the mixed arrangement of cations in the lithium layer affects the first charge and discharge efficiency and cycle stability of the material.

Method used

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  • Lithium/sodium dual-ion manganese-based oxide positive electrode material and preparation method and application thereof
  • Lithium/sodium dual-ion manganese-based oxide positive electrode material and preparation method and application thereof
  • Lithium/sodium dual-ion manganese-based oxide positive electrode material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0071] (1) Disperse 4.09g manganese acetate tetrahydrate, 1.04g nickel acetate tetrahydrate and 1.04g cobalt acetate tetrahydrate in 25mL deionized water to obtain a mixed transition metal salt solution;

[0072] (2) Disperse 5.7g oxalic acid dihydrate in 100mL deionized water to obtain an oxalic acid solution;

[0073] (3) Disperse 2.385 g of anhydrous lithium acetate and 0.269 g of anhydrous sodium acetate in 25 mL of deionized water. Wherein, lithium salt is excessive 5%wt to replenish the lithium volatilized in the calcining process;

[0074] (4) Add the mixed transition metal salt solution in step (1) to the oxalic acid solution in step (2), stir while adding it dropwise to make it react fully, the stirring speed is 800rmp, continue to stir for 2h after the dropwise addition, and stir to make The reaction system is uniformly mixed and dispersed, which is conducive to the full progress of the reaction;

[0075] (5) Add the lithium acetate and sodium acetate solution prep...

Embodiment 2

[0079] (1) Disperse 4.09g manganese acetate tetrahydrate, 1.04g nickel acetate tetrahydrate and 1.04g cobalt acetate tetrahydrate in 25mL deionized water to obtain a mixed transition metal salt solution;

[0080] (2) Disperse 5.7g oxalic acid dihydrate in 100mL deionized water to obtain an oxalic acid solution;

[0081] (3) Disperse 1.95 g of anhydrous lithium acetate and 0.808 g of anhydrous sodium acetate in 25 mL of deionized water. Wherein, lithium salt is excessive 5%wt to replenish the lithium volatilized in the calcining process;

[0082] (4) Add the mixed transition metal salt solution in step (1) to the oxalic acid solution in step (2), and stir while adding it dropwise to make it react fully, the stirring speed is 800rmp, and continue to stir for 2h after the dropwise addition;

[0083] (5) Add the lithium acetate and sodium acetate solution prepared in step (3) to the reaction solution in step (4), stir while adding dropwise to make it evenly mixed, the stirring sp...

Embodiment 3

[0087] (1) Disperse 4.09g manganese acetate tetrahydrate, 1.04g nickel acetate tetrahydrate and 1.04g cobalt acetate tetrahydrate in 25mL deionized water to obtain a mixed transition metal salt solution;

[0088] (2) Disperse 5.7g oxalic acid dihydrate in 100mL deionized water to obtain an oxalic acid solution;

[0089] (3) Disperse 1.517 g of anhydrous lithium acetate and 1.346 g of anhydrous sodium acetate in 25 mL of deionized water. Wherein, lithium salt is excessive 5%wt to replenish the lithium volatilized in the calcining process;

[0090] (4) Add the mixed transition metal salt solution in step (1) to the oxalic acid solution in step (2), and stir while adding it dropwise to make it react fully, the stirring speed is 800rmp, and continue to stir for 2h after the dropwise addition;

[0091] (5) Add the lithium acetate and sodium acetate solution prepared in step (3) to the reaction solution in step (4), stir while adding dropwise to make it evenly mixed, the stirring s...

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Abstract

The invention discloses a lithium / sodium dual-ion manganese-based oxide positive electrode material and a preparation method and an application thereof. The preparation method comprises the followingsteps of (1) dispersing transitional metal salt into a solvent to obtain a metal salt solution; (2) dispersing a lithium salt and a sodium salt into the solvent to obtain a mixed solution I; (3) adding the metal salt solution obtained in the step (1) into an oxalic acid solution to be reacted to obtain a reaction solution II; (4) dispersing the mixed solution I obtained in the step (2) into the reaction solution II obtained in the step (3), and next, performing freezing and drying, and grinding into powder to obtain precursor powder; and (5) performing calcining on the precursor powder obtained in the step (4) to obtain the lithium / sodium dual-ion manganese-based oxide positive electrode material. By utilizing the joint advantages of a lithium ion battery and a sodium ion battery, a dual-ion synergistic effect is realized, and high product crystallization, high electrochemical performance, relatively high specific capacity and high cycling stability are shown.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and in particular relates to a lithium / sodium double-ion manganese-based oxide cathode material and a preparation method and application thereof. Background technique [0002] Due to the advantages of high energy density, high energy storage capacity, and long cycle life, rechargeable lithium-ion batteries have attracted extensive attention. Today, rechargeable lithium-ion batteries are used in many electronic devices, including smartphones, laptops and electric vehicles. It is well known that cathode materials play an important role in Li-ion batteries from the perspective of cost and energy density. In lithium-ion batteries, lithium cobaltate is the earliest and widely used commercial cathode material because of its simple synthesis method, good reversible charge-discharge performance and stable discharge platform. However, due to the low actual specific capacity of lithium cobal...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/505H01M10/0525H01M10/054
CPCY02E60/10
Inventor 周宇侯贤华
Owner SOUTH CHINA NORMAL UNIVERSITY
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