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Manganese-based layered lithium-enriched material having one-dimensional porous structure and preparation method thereof

A technology of porous structure and lithium-rich materials, applied to structural parts, electrical components, battery electrodes, etc., can solve the problems of material collapse and falling off, shortened cycle life, poor cycle performance, etc., to reduce stress, improve cycle performance, and high The effect of compaction density

Inactive Publication Date: 2015-04-22
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the main disadvantages of this class of materials are poor rate capability and poor cycle performance, the former is due to the composition of the material containing Li with low electronic and ionic conductivity. 2 MnO 3 The reason for the latter is that it contains nickel. The introduction of nickel will cause a large degree of ion mixing, which will change the structure of the material during cycling. The change in structure will cause the material to collapse and fall off, thus greatly reducing the cycle life.

Method used

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  • Manganese-based layered lithium-enriched material having one-dimensional porous structure and preparation method thereof
  • Manganese-based layered lithium-enriched material having one-dimensional porous structure and preparation method thereof
  • Manganese-based layered lithium-enriched material having one-dimensional porous structure and preparation method thereof

Examples

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Effect test

Embodiment 1

[0034] A method for preparing a manganese-based layered lithium-rich material with a one-dimensional porous structure, comprising the following steps:

[0035] (1) Add 15mL deionized water into a 500mL high-necked beaker, and then stir at a stirring speed of 300r·min -1 Add 1.52g oxalic acid under the condition of oxalic acid and make it fully dispersed to obtain oxalic acid solution;

[0036] Under mechanical stirring at 500r / min, add 10g CTAB to the oxalic acid solution, keep stirring for 30min, then add 300mL cyclohexane and 10mL n-pentanol, keep stirring for 1.5h to obtain solution A;

[0037] (2) Under the mechanical stirring of 1000r / min, slowly add 5mL of 0.06mol·L-1 Manganese acetate and 0.09mol·L -1 Cobalt acetate mixed solution, reacted for 12h, and then at 20000r·min -1 centrifuged at low temperature, washed 5 times with absolute ethanol, and vacuum-dried at 60°C for 12 hours to obtain oxalate micro-nanorods with a one-dimensional structure;

[0038] (3) The oxal...

Embodiment 2

[0041] A method for preparing a manganese-based layered lithium-rich material with a one-dimensional porous structure, comprising the following steps:

[0042] (1) Add 20mL deionized water into a 1000mL high-necked beaker, and then stir at a stirring speed of 500r·min -1 Add 2.53g oxalic acid under the condition of oxalic acid and make it fully dispersed to obtain oxalic acid solution;

[0043] Under mechanical stirring at 800r / min, add 18g CTAB to the oxalic acid solution, keep stirring for 1h, then add 700mL cyclohexane and 30mL n-pentanol, keep stirring for 2h, to obtain solution A;

[0044] (2) Under the mechanical stirring of 800r / min, slowly add 40mL of 0.05mol·L -1 Manganese chloride and 0.2mol·L -1 mixed solution of cobalt chloride, reacted for 8h, and then at 15000r·min -1 centrifuged at low temperature, washed 3 times with absolute ethanol, and vacuum-dried at 40°C for 15 hours to obtain oxalate micro-nanorods with a one-dimensional structure;

[0045] (3) The ox...

Embodiment 3

[0048] A method for preparing a manganese-based layered lithium-rich material with a one-dimensional porous structure, comprising the following steps:

[0049] (1) Add 4mL deionized water into a 100mL high-necked beaker, and then stir at 400r·min -1 Add 0.25g oxalic acid under the condition of oxalic acid and make it fully dispersed to obtain oxalic acid solution;

[0050] Under mechanical stirring at 600r / min, add 2g CTAB to the oxalic acid solution, keep stirring for 40min, then add 30mL cyclohexane and 1.5mL n-pentanol, keep stirring for 1.5h to obtain solution A;

[0051] (2) Under mechanical stirring at 900r / min, slowly add 4 mL of 0.5 mol·L -1 manganese nitrate and 0.125mol L -1 Cobalt nitrate mixed solution, reacted for 10h, and then at 19000r·min -1 centrifuged at low temperature, washed 4 times with absolute ethanol, and vacuum-dried at 80°C for 20 hours to obtain oxalate micro-nanorods with a one-dimensional structure;

[0052] (3) The oxalate micro-nanorods with...

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Abstract

The invention discloses a manganese-based layered lithium-enriched material having a one-dimensional porous structure and a preparation method of the manganese-based layered lithium-enriched material. The preparation method comprises the following steps: adding cetyl trimethyl ammonium bromide into oxalic acid solutions under a stirring condition, and adding n-amyl alcohol, cyclohexane and a mixed solution of manganese salt and cobalt salt to obtain an oxalate micro-nanometer rod with the one-dimensional structure; preparing the oxalate micro-nanometer rod with the one-dimensional structure into a manganese-cobalt oxide micro-nanometer rod having a one-dimensional porous structure; and finally, performing reaction on the manganese-cobalt oxide micro-nanometer rod having the one-dimensional porous structure and a proper amount of lithium sources to obtain the manganese-based layered lithium-enriched material having the one-dimensional porous structure. The manganese-based layered lithium-enriched material having the one-dimensional porous structure is high in specific capacity, high in multiplying power performance and high in cycle performance.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a manganese-based layered lithium-rich material with a one-dimensional porous structure and a preparation method thereof. Background technique [0002] Driven by the rapid development of economy and science and technology, lithium-ion batteries, as the protagonist of current power and energy storage power sources, are also facing various pressures, especially in terms of energy density. Energy density is closely related to the capacity of the material and the potential difference of the battery. The premise of improving the energy density of the battery is that the material must have a high lithium intercalation capacity and a large potential difference between the positive and negative electrodes. At present, commercial lithium electronic batteries all use carbon negative electrodes, mainly graphite, because the lithium intercalation potential of graphite is clo...

Claims

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Application Information

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IPC IPC(8): H01M4/505
CPCH01M4/505Y02E60/10
Inventor 李伟善陈东瑞陈敏洪鹏波余启鹏陈芷婷宋帅熊恋文姚春凤
Owner SOUTH CHINA NORMAL UNIVERSITY
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