Lithium iron phosphate-coated lithium nickel-cobalt manganate and preparation method thereof

A technology of nickel-cobalt lithium manganese oxide and lithium iron phosphate, which is applied in the field of lithium-ion secondary battery cathode materials and its preparation, can solve problems such as poor cycle performance stability, achieve good safety and cycle performance, reduce contact, and complete crystal form Effect

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

AI Technical Summary

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 nickel-cobalt-manganese acid coated with lithium iron phosphate that can effectively allevi

Method used

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  • Lithium iron phosphate-coated lithium nickel-cobalt manganate and preparation method thereof
  • Lithium iron phosphate-coated lithium nickel-cobalt manganate and preparation method thereof
  • Lithium iron phosphate-coated lithium nickel-cobalt manganate and preparation method thereof

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preparation example Construction

[0026] According to the first aspect of the present invention, the preparation method of the lithium iron phosphate-coated nickel-cobalt-manganese oxide comprises: under solvothermal reaction conditions, combining nickel-cobalt-manganese oxide with lithium source, iron source and phosphorus source The mixture of the lithium iron phosphate precursor mixed solution is heat-treated, the product obtained after the heat treatment is subjected to solid-liquid separation, and the obtained solid phase is dried. In the lithium iron phosphate precursor mixed solution containing lithium source, iron source and phosphorus source The solvent is an organic solvent.

[0027] According to the present invention, the organic solvent can effectively dissolve the lithium source, the iron source and the phosphorus source to form a uniform solution. Preferably, the organic solvent is selected from ethylene glycol, glycerol, diethylene glycol, triethylene glycol, One or more of tetraethylene glycol ...

Embodiment 1

[0056] This example is used to illustrate the preparation of nickel cobalt lithium manganese oxide material coated with lithium iron phosphate.

[0057] Mixing of raw materials: Weigh LiOH·H 2 O, Fe(CH 3 COO) 2 4H 2 O each dissolved in 20ml of glycerol, the H3 PO 4 (mass fraction 85%) is added dropwise in the LiOH solution, forms the second solution, and Fe(CH 3 COO) 2 The solution is slowly added dropwise into the second solution to obtain a lithium iron phosphate precursor mixed solution containing a lithium source, a phosphorus source and an iron source. Wherein, the concentration of the iron source in the lithium iron phosphate precursor mixed solution is 0.05mol / L, and the molar ratio of lithium, iron, and phosphorus is 3:1:1.

[0058] Solvothermal method and post-treatment: add 3.88g of NCM622 ternary material to the lithium iron phosphate precursor mixture containing lithium source, phosphorus source and iron source obtained above, continue stirring for 5min, and ...

Embodiment 2

[0063] This example is used to illustrate the preparation of nickel cobalt lithium manganese oxide material coated with lithium iron phosphate.

[0064] Mixing of raw materials: Weigh LiOH·H 2 O, FeSO 4 ·7H 2 O each dissolved in 20ml of ethylene glycol, the H 3 PO 4 Added dropwise to FeSO 4 ·7H 2 In the O solution, the first solution was formed, and LiOH·H 2 The O solution is slowly added dropwise into the first solution to obtain a lithium iron phosphate precursor mixed solution containing a lithium source, a phosphorus source and an iron source. Wherein, the concentration of the iron source in the lithium iron phosphate precursor mixture is 0.1 mol / L, and the molar ratio of lithium, iron, and phosphorus is 2.7:1:1.

[0065] Solvothermal reaction and post-treatment: Add 3.88g of NCM622 ternary material to the lithium iron phosphate precursor mixture containing lithium source, phosphorus source and iron source obtained above, continue stirring for 5min, and finally tran...

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Abstract

The invention relates to the field of a lithium ion battery electrode material, and discloses lithium iron phosphate-coated lithium nickel-cobalt manganate and a preparation method thereof. The preparation method comprises the steps of performing thermal processing on a mixture of the lithium nickel-cobalt manganate and a lithium iron phosphate precursor mixed liquid containing a lithium source, an iron source and a phosphate source under a condition of solvothermal reaction; and performing solid-liquid separation on the product obtained after thermal processing, and drying to obtain a solid phase, wherein a solvent in the lithium iron phosphate precursor mixed liquid containing the lithium source, the iron source and the phosphate source is an organic solvent. The organic solvent is usedas 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 lithium iron phosphate-coated lithium nickel-cobalt manganate with 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 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] At present, the ternary material nickel-cobalt lithium manganese oxide battery has the characteristics of high specific capacity, low cost, and good safety performance, and has broad application prospects. It u...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCY02E60/10
Inventor 曹亚丽戴仲葭杜泽学
Owner CHINA PETROLEUM & CHEM CORP
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