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Preparation method of metaphosphate-coated lithium cobalt oxide material and lithium ion battery containing metaphosphate-coated lithium cobalt oxide material

A technology of metaphosphate-coated lithium cobalt oxide and phosphate-coated lithium cobalt oxide, applied in the field of functional material preparation, can solve the problems of high price of LiCoO, inability to meet performance requirements, slow growth of cobalt output, etc. The effect of discharge capacity and cycle stability, easy operation, and simple preparation method

Active Publication Date: 2021-04-27
宁波维科新能源科技有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

With the development of 5G and the continuous popularization and upgrading of global digital products, LiCoO 2 The market demand in China continues to grow, with an annual growth rate of 10%. However, there is a shortage of domestic cobalt resources, and the growth of cobalt production is slow, which is far from meeting the needs of the domestic market. As a result, 80% of the supply of cobalt needs to be imported, and it is often affected by the over-export policy of raw materials such as Africa. The effect of LiCoO 2 long-term high prices
Due to the rapid improvement in the performance of consumer digital products, the requirements for the energy density and charge-discharge rate of lithium-ion batteries are also getting higher and higher, and LiCoO 2 The performance of the lithium-ion battery as the positive electrode cannot meet the increasing performance requirements

Method used

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  • Preparation method of metaphosphate-coated lithium cobalt oxide material and lithium ion battery containing metaphosphate-coated lithium cobalt oxide material
  • Preparation method of metaphosphate-coated lithium cobalt oxide material and lithium ion battery containing metaphosphate-coated lithium cobalt oxide material
  • Preparation method of metaphosphate-coated lithium cobalt oxide material and lithium ion battery containing metaphosphate-coated lithium cobalt oxide material

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preparation example Construction

[0026] In some embodiments of the present invention, the preparation method of the metaphosphate-coated lithium cobalt oxide material comprises: dissolving hydroxide in a phosphoric acid solution, reacting to obtain a dihydrogen phosphate solution, and then adding cobalt salt to adjust the pH 9-13, after further reaction, wash the obtained precipitate to neutrality, and dry to obtain the precursor;

[0027] The precursor, the lithium source, and the ethyl cellulose are dissolved in an organic solvent for ball milling, and the obtained sol-like mixture is dried and calcined to obtain a metaphosphate-coated lithium cobaltate material.

[0028] Control the reaction conditions so that hydroxide and phosphoric acid react to form dihydrogen phosphate, and dihydrogen phosphate and cobalt salt react under alkaline conditions to obtain a precursor, which is dissolved in an organic solvent with lithium source and ethyl cellulose After ball milling, drying, and calcination, the dihydroge...

Embodiment 1

[0039] Dissolve 0.2mol aluminum hydroxide in 0.6L 1mol / L phosphoric acid solution, stir and react at 140°C to obtain aluminum dihydrogen phosphate solution, then add 4mol cobalt sulfate, then drop in 4mol / L NaOH solution and 0.5mol / L Adjust the pH of the solution to 11 with ammonia solution, react at 60°C for 30 minutes, wash the obtained precipitate to neutrality, and dry it at 75°C to obtain the precursor;

[0040] Mix the precursor with 4.24 mol of lithium nitrate, and then add ethyl cellulose, which accounts for 1 wt% of the total amount of the precursor, lithium nitrate, and ethyl cellulose, and dissolve the mixture in ethanol and ball mill for 8 hours to form a sol The mixture was then dried at 150°C for 8 hours, and then heated to 850°C for 2 hours at a rate of 3°C / min and calcined for 2 hours. After sintering, it was cooled to obtain an aluminum metaphosphate-coated lithium cobaltate material.

Embodiment 2

[0042] Dissolve 0.3mol lithium hydroxide in 0.5mol / L phosphoric acid solution, adjust the amount of phosphoric acid solution added, so that the pH of the reaction end point is 2.5, and obtain a lithium dihydrogen phosphate solution, then add 10mol cobalt nitrate, and then drop in 3mol / L NaOH solution and 0.5 mol / L ammonia solution to adjust the pH of the solution to 10, further react at 50°C for 35 minutes, wash the obtained precipitate to neutrality, and dry at 80°C to obtain the precursor;

[0043] Mix the precursor with 5mol of lithium carbonate, then add ethyl cellulose, ethyl cellulose accounts for 1.5wt% of the total amount of the precursor, lithium carbonate, and ethyl cellulose, the mixture is dissolved in ethanol and ball milled for 7 hours to form a sol The mixture was then dried at 140°C for 8 hours, then heated to 750°C at a rate of 2°C / min and calcined for 2.5 hours, and cooled after sintering to obtain a lithium metaphosphate-coated lithium cobaltate material.

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Abstract

The invention provides a preparation method of a metaphosphate coated lithium cobalt oxide material, and the method comprises the following steps: dissolving hydroxide in a phosphoric acid solution, performing reacting to obtain a dihydric phosphate solution, then adding cobalt salt, adjusting the pH value to 9-13, performing further reacting, washing the obtained precipitate to be neutral, and performing drying to obtain a precursor; dissolving the precursor, a lithium source and ethyl cellulose in an organic solvent for ball milling, and drying and calcining the obtained sol-like mixture to obtain the metaphosphate-coated lithium cobalt oxide material. The metaphosphate-coated lithium cobalt oxide material is obtained by adopting an in-situ polymerization mode, is low in cost, is applied to a lithium ion battery, and can improve the performance of the battery.

Description

technical field [0001] The invention belongs to the field of preparation of functional materials, and relates to a method for preparing a metaphosphate-coated lithium cobalt oxide material and a lithium ion battery containing the same. Background technique [0002] Lithium-ion battery is a new type of secondary energy storage battery developed in the 1990s. Due to its high energy, long life, low consumption, pollution-free, no memory effect, small self-discharge, small internal resistance, high cost performance, and low pollution Less and other advantages, are widely used in the field of electronics. One of the bottlenecks restricting the industrialization of lithium-ion batteries is the cathode material. At present, lithium-ion battery cathode materials mainly include lithium cobalt oxide (LiCoO 2 ), lithium nickelate, lithium manganate and lithium iron phosphate, among which LiCoO 2 As the earliest commercial lithium-ion battery cathode material, it has high voltage and...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/0525
CPCH01M4/362H01M4/525H01M4/62H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 孙珊珊孙嘉隆赵亚易刘波黄浩马伟华
Owner 宁波维科新能源科技有限公司
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