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Doped lithium manganate and preparation method and application thereof

A lithium heteromanganate and manganese-based technology, applied in the field of material synthesis, can solve problems such as unresolved crystal plane growth, achieve the effects of improving cycle performance, reducing contact area, and reducing the probability of dissolution

Active Publication Date: 2021-10-19
高点(深圳)科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above three methods can obtain lithium manganate materials with improved properties to a certain extent, they do not solve the problem of growth of spinel structure (111) crystal planes in lithium manganate materials.

Method used

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  • Doped lithium manganate and preparation method and application thereof
  • Doped lithium manganate and preparation method and application thereof
  • Doped lithium manganate and preparation method and application thereof

Examples

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preparation example Construction

[0043] 1. Preparation method of doped lithium manganate

[0044]The first aspect of the present application provides a kind of preparation method of doped lithium manganese oxide, comprises the following steps:

[0045] S1, first prepare a manganese-based precursor with a controllable particle size distribution using a soluble manganese salt, and uniformly mix the dopant substance with the manganese-based precursor to obtain a mixture A; or directly mix the soluble manganese salt and the dopant substance, thereby Prepare a mixture A containing a manganese-based precursor and a dopant with a controllable particle size distribution;

[0046] S2, pretreating the mixture A;

[0047] S3, mixing the pretreated mixture A with a lithium salt to obtain a mixture B;

[0048] S4, raising the temperature of the mixture B in air or an oxidizing atmosphere to perform a solid phase sintering reaction to obtain doped lithium manganate with a controllable particle size.

[0049] The invento...

Embodiment 1

[0074] Preparation of doped lithium manganate:

[0075] S1, weigh 10g of manganese sulfate, add 30g of tap water to obtain a manganese sulfate solution; prepare a sodium hydroxide solution with a concentration of about 50g / L, drop the sodium hydroxide solution and the manganese sulfate solution into an empty beaker containing an appropriate amount of deionized water at the same time In the process, stir while adding dropwise, by controlling the dropping rate (0.1mL / min~0.5L / min), stirring rate (300rpm~2000rpm) and temperature (0℃~90℃) to control the particle size of the precipitate ( D50 is 2um-50um), and finally filtered, washed, and dried to obtain a manganese-based precursor. Weigh an appropriate amount of yttrium acetate and lanthanum acetate, wherein the molar ratio of lanthanum to yttrium is 1:1, and the ratio of the amount of manganese to yttrium and lanthanum is about 100:1, mix the mixture containing yttrium and lanthanum with the manganese precursor Mix well to obta...

Embodiment 2

[0080] Preparation of doped lithium manganate:

[0081] S1, take by weighing 10g manganese acetate, add 30g tap water, obtain manganese acetate solution; Preparation concentration is about the sodium carbonate solution of 30g / L, sodium carbonate solution and manganese sulfate solution are added dropwise in the empty beaker that contains appropriate amount of deionized water simultaneously, Stir while adding dropwise, and control the particle size of the precipitate by controlling the dropping rate, stirring rate and temperature, and finally filter, wash, and dry to obtain the manganese-based precursor. Take an appropriate amount of yttrium acetate, lanthanum acetate and isopropyl titanate for later use, wherein the molar ratio of yttrium, lanthanum and titanium is 1:2:2, mix and stir it with the manganese precursor, and dry it to obtain a mixture A, wherein The ratio of the amount of manganese to the amount of substance of the elements M (yttrium, lanthanum and titanium) in th...

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Abstract

The invention belongs to the technical field of material synthesis, and particularly relates to a preparation method of doped lithium manganate, which comprises the following steps of: S1, preparing a manganese series precursor with controllable particle size distribution by using soluble manganese salt, and uniformly mixing a doping substance with the manganese series precursor to obtain a mixture A; or directly mixing the soluble manganese salt with the doping substance so as to prepare a mixture A containing the manganese series precursor with controllable particle size distribution and the doping substance; S2, pretreating the mixture A; S3, mixing the pretreated mixture A with a lithium salt to obtain a mixture B; and S4, heating the mixture B in air or an oxidizing atmosphere, and carrying out a solid-phase sintering reaction to obtain the doped lithium manganate with the controllable particle size. In addition, the invention also relates to doped lithium manganate and application thereof in a lithium ion battery. Compared with the prior art, the spherical monocrystal lithium manganate prepared by the method has the advantages that the growth of a crystal face (111) in the lithium manganate material is inhibited, and the performance of the lithium manganate material is improved.

Description

technical field [0001] The invention belongs to the technical field of material synthesis, and in particular relates to a doped lithium manganese oxide and its preparation method and application. Background technique [0002] Lithium-ion batteries are used more and more widely in people's daily life. The current commercial lithium-ion battery cathode materials are mainly lithium iron phosphate, lithium cobalt oxide or ternary nickel-cobalt-manganese solid solution materials, but their costs are still relatively high. For the lithium-ion battery market, low-cost lithium-ion battery cathode materials still have great market appeal. As a cathode material for lithium-ion batteries, spinel-type lithium manganate not only has the advantages of low synthesis conditions, abundant manganese ore resources, and low material cost, but also has a higher charge-discharge voltage platform, Good overcharge resistance, excellent rate performance and other advantages. Therefore, lithium ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525H01M10/42C01G45/12
CPCH01M4/5825H01M10/4235H01M10/0525C01G45/1214C01P2004/32C01P2002/32Y02E60/10
Inventor 方刚赵孝连杨亮亮陈月升蒋凯闵婷
Owner 高点(深圳)科技有限公司
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