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Metal element-doped lithium iron phosphate-coated lithium nickel-cobalt manganate and preparation method thereof

A technology of nickel cobalt lithium manganate and lithium iron phosphate, applied in the field of lithium ion secondary battery cathode material and its preparation, can solve problems such as poor cycle performance stability, achieve stable voltage platform, controllable size, and alleviate specific energy decline Effect

Inactive Publication Date: 2019-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the problems existing in the prior art, and to provide a metal element-doped lithium iron phosphate package that can improve the problem of poor cycle performance stability on the premise of effectively alleviating the specific energy decline of nickel-cobalt lithium manganese oxide. Coated nickel cobalt lithium manganese oxide and preparation method thereof

Method used

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  • Metal element-doped lithium iron phosphate-coated lithium nickel-cobalt manganate and preparation method thereof
  • Metal element-doped lithium iron phosphate-coated lithium nickel-cobalt manganate and preparation method thereof
  • Metal element-doped lithium iron phosphate-coated lithium nickel-cobalt manganate and preparation method thereof

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preparation example Construction

[0027] According to the first aspect of the present invention, the preparation method of nickel-cobalt lithium manganese oxide coated with lithium iron phosphate doped with metal elements comprises:

[0028] Under solvothermal reaction conditions, the mixture of nickel-cobalt lithium manganese oxide and lithium iron phosphate precursor mixed solution doped with M element containing lithium source, doped metal M source, iron source and phosphorus source is heat-treated, and the heat-treated The obtained product is subjected to solid-liquid separation, and the obtained solid phase is dried, and the solvent in the M element-doped lithium iron phosphate precursor mixed solution containing lithium source, doped metal M source, iron source and phosphorus source is organic solvent.

[0029] According to the present invention, the organic solvent can effectively dissolve the lithium source, the doping metal M source, the iron source and the phosphorus source to form a uniform solution...

Embodiment 1

[0062] This example is used to illustrate the preparation of metal element doped lithium iron phosphate coated nickel cobalt lithium manganese oxide material.

[0063] Mixing of raw materials: Weigh the lithium source lithium hydroxide, the manganese source manganese chloride, the iron source ferrous sulfate, and the phosphorus source phosphoric acid respectively in proportion, and dissolve the lithium source, the manganese source and the iron source mixture in 20ml of ethylene glycol . Firstly, the mixed solution of ferrous sulfate, manganese chloride and phosphoric acid (mass fraction 85%) was mixed and stirred to form the first solution. Secondly, the lithium hydroxide solution was added dropwise to the first solution, and stirred for 30 minutes to obtain the M element-doped lithium iron phosphate precursor mixed solution containing lithium source, manganese source, phosphorus source and iron source. Among them, Mn concentration is 0.005mol / L, Fe concentration is 0.045mol / ...

Embodiment 2

[0069] This example is used to illustrate the preparation of metal element doped lithium iron phosphate coated nickel cobalt lithium manganese oxide material.

[0070] Mixing of raw materials: Weigh the lithium source lithium hydroxide, the manganese source manganese chloride, the iron source ferrous sulfate, and the phosphorus source phosphoric acid respectively in proportion, and dissolve the lithium source, the manganese source and the iron source mixture in 20ml of ethylene glycol . First, lithium hydroxide solution and phosphoric acid (mass fraction 85%) were mixed and stirred to form a second solution. Secondly, the mixed solution of ferrous sulfate and manganese chloride was added dropwise to the second solution, and stirred for 30 minutes to obtain an M element-doped lithium iron phosphate precursor mixed solution containing lithium source, manganese source, phosphorus source and iron source. Among them, the Mn concentration is 0.005 mol / L, the Fe concentration is 0.0...

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Abstract

The invention relates to the field of a lithium ion battery electrode material, and discloses metal element-doped lithium iron phosphate-coated lithium nickel-cobalt manganate and a preparation methodthereof. The preparation method comprises the steps of performing thermal treatment on the lithium nickel-cobalt manganate and a mixture of an M element-doped lithium iron phosphate precursor mixed liquid comprising a lithium source, a doped metal M source, an iron source and a phosphorus source; performing solid-liquid separation on a product obtained after thermal treatment, and drying to obtain a solid phase, wherein a solvent in the M element-doped lithium iron phosphate precursor mixed liquid comprising the lithium source, the doped metal M source, the iron source and the phosphorus source is used as an organic solvent. The organic solvent is used as a reaction liquid, the problem of serious water absorption of a lithium nickel-cobalt manganate ternary material, particularly a high-nickel ternary material is effectively solved, so that the metal element-doped lithium iron phosphate-coated lithium nickel-cobalt manganate having favorable electrochemical performance is prepared.

Description

technical field [0001] The invention relates to a lithium-ion secondary battery cathode material and a preparation method thereof, in particular to nickel-cobalt lithium manganese oxide coated with lithium iron phosphate doped with metal elements and a preparation method thereof. Background technique [0002] my country's new energy automobile industry is booming along with the policy warm wind, and the power battery market has a broad space. At present, the power battery is still mainly lithium iron phosphate battery, but its specific energy is limited, and it will be difficult to meet the needs of passenger cars in terms of cruising range in the future. Therefore, the pursuit of high specific energy is an important research and development direction of lithium-ion power batteries. [0003] The ternary material nickel cobalt lithium manganese oxide battery has high specific energy and broad application prospects. However, the safety performance and cycle performance of ni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M4/62H01M10/0525H01M10/42B82Y30/00
CPCY02E60/10
Inventor 戴仲葭曹亚丽杜泽学
Owner CHINA PETROLEUM & CHEM CORP
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