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Preparation method of amorphous mono-crystalline precursor oxide

A precursor and amorphous technology, applied in chemical instruments and methods, inorganic chemistry, nickel compounds, etc., can solve the problems affecting battery cycle performance and charge-discharge stability, high-temperature cycle performance and rate performance, single crystal structure and crystallinity To achieve the effect of improving high-temperature cycle performance and high-temperature rate performance, good high-temperature safety performance and high-temperature rate performance, and reducing side reactions

Inactive Publication Date: 2019-02-05
CNGR ADVANCED MATERIAL CO LTD
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Problems solved by technology

When lithium cobalt oxide is used as the positive electrode material of lithium-ion batteries, there are a series of negative problems such as high cost, poor thermal stability, and cobalt pollution of the environment. Therefore, it is necessary to develop new lithium-ion battery positive electrode materials
[0003] In the existing lithium-ion battery technology field, the anode materials of lithium-ion batteries are mainly prepared by conventional methods to first prepare amorphous ternary precursors, and then directly add lithium salts to prepare amorphous ternary materials through calcination. This method has the advantages of simple process and equipment. However, the electrical properties of the ternary materials prepared by calcination are average, and the high-temperature cycle performance and rate performance are poor.
[0004] In view of the defects of ternary precursor products prepared by conventional methods, there is a kind of single-crystal-like ternary material prepared by using secondary particle spherical ternary precursor hydroxide and lithium carbonate mixed through high-temperature calcination thermochemical reaction in the prior art. This method has the advantages of good high-temperature cycle performance and rate performance, but the energy consumption of material preparation is high, the cost is high, and the single crystal structure and crystallinity are poor
[0005] At present, in the field of lithium ion battery technology, there is also a process of preparing ternary material precursor oxides by heat treatment after preparing ternary precursors. The products prepared by this method are all spherical or spherical secondary Secondary particles, this shape is easy to cause secondary particle fragmentation in the later stage of positive electrode material preparation and battery manufacturing process, affecting the cycle performance and charge-discharge stability of the battery

Method used

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  • Preparation method of amorphous mono-crystalline precursor oxide
  • Preparation method of amorphous mono-crystalline precursor oxide
  • Preparation method of amorphous mono-crystalline precursor oxide

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preparation example Construction

[0032] as attached figure 1 Shown, a kind of preparation method of amorphous single crystal precursor oxide comprises the following steps:

[0033] S1, Amorphous ternary precursor with composite structure prepared by co-precipitation method;

[0034] S101, preparing a metal salt solution and a liquid caustic solution as a raw and auxiliary material solution for coprecipitation reaction, adding pure water to the effective volume position of the reaction kettle, heating the pure water in the reaction kettle, and then adding the prepared liquid caustic solution to adjust the pH range to obtain a co-precipitation reaction. The bottom solution of the precipitation reaction;

[0035] In S101, the metal salt solution is prepared by mixing nickel salt, cobalt salt, and manganese salt according to the traditional process. The total metal ion solubility of the prepared liquid alkali solution is 0.5-2mol / L. Concentration of 3-12mol / L, nickel salt, cobalt salt, manganese salt is at leas...

Embodiment 1

[0047] First, add pure water to the reactor and heat it to 40°C, then add the prepared liquid caustic soda solution to adjust the pH to 11.0, and mix the stirring blades inside the reactor at a speed of 300r / min to prepare the bottom liquid of the co-precipitation reaction , then add the metal salt solution of 0.5mol / L and the liquid caustic soda solution of 3mol / L with the flow rate of 15L / h, after the co-precipitation reaction of 2 hours takes place in the reactor, flow out from the discharge port of the reactor, obtain The solid-liquid mixed amorphous ternary precursor slurry is washed with impurities, filtered, dehydrated, and dried to obtain an amorphous ternary precursor with a composite structure. The amorphous ternary precursor is subjected to high-temperature thermal decomposition treatment at a temperature of 500°C , the high-temperature thermal decomposition treatment time is 8 hours, after the powder material after high-temperature heat treatment is collected, crush...

Embodiment 2

[0049] First, add pure water to the reactor and heat it to 55°C, then add the prepared liquid caustic soda solution to adjust the pH to 12.0, and mix the stirring blades inside the reactor at a speed of 450r / min to prepare the bottom liquid for coprecipitation reaction , then add the metal salt solution of 1.25mol / L and the liquid caustic soda solution of 9mol / L with the flow rate of 60L / h, after coprecipitation reaction takes place in reactor for 11 hours, flow out from the outlet of reactor, obtain The solid-liquid mixed amorphous ternary precursor slurry is washed with impurities, filtered, dehydrated, and dried to obtain an amorphous ternary precursor with a composite structure. The amorphous ternary precursor is subjected to high-temperature thermal decomposition treatment at a temperature of 750°C , the high-temperature thermal decomposition treatment time is 22 hours. After the powder material after high-temperature heat treatment is collected, crushed, classified, sieve...

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Abstract

The invention discloses a preparation method of amorphous mono-crystalline precursor oxide and belongs to the technical field of lithium ion batteries. Amorphous ternary precursor hydroxide is prepared through a co-precipitation method; then amorphous ternary precursor oxide with a mono-crystalline shape is obtained through high-temperature thermal decomposition and the amorphous mono-crystallineternary precursor oxide is used as a novel lithium ion battery positive electrode material; the high-temperature circulating performance and the high-temperature rate performance of the lithium ion batteries can be effectively improved and a charging / discharging voltage platform of an existing ternary material is improved; the high-temperature safety, circulating and large-power charging / discharging properties of an existing lithium ion battery system are effectively improved; the invention provides the lithium ion battery positive electrode material with low manufacturing cost and good electric performance and defects of an existing lithium ion battery positive electrode material are made up; the problem that the capacity of the lithium ion battery positive electrode material is low is effectively improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing an amorphous single crystal precursor oxide. Background technique [0002] Compared with traditional secondary batteries such as lead-acid, lithium-ion batteries have many advantages such as high voltage, high capacity, high energy density, good cycle performance, and environmental friendliness. The performance of lithium-ion batteries depends largely on the cathode material. When lithium cobalt oxide is used as the positive electrode material of lithium-ion batteries, there are a series of negative problems such as high cost, poor thermal stability, and cobalt pollution of the environment. Therefore, it is necessary to develop new lithium-ion battery positive electrode materials. [0003] In the existing lithium-ion battery technology field, the anode materials of lithium-ion batteries are mainly prepared by conventional methods to first pre...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/006C01P2004/03C01P2006/40H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 任永志訚硕伍兴科薛鹏
Owner CNGR ADVANCED MATERIAL CO LTD
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