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Method for preparing multi-element metal oxide containing nickel-cobalt and method for carrying out surface coating decoration

A multi-metal and oxide technology, applied in nickel compounds, cobalt compounds, chemical instruments and methods, etc., can solve the problems of poor surface coating and modification, complex ion exchange method steps, poor processing behavior of pole pieces, etc. Improved surface structure and particle distribution, improved charge-discharge specific capacity and cycle performance, and improved pole piece processing behavior

Active Publication Date: 2007-11-21
TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The steps of the ion exchange method are complicated and expensive; the pole piece made by the wet chemical method is easy to dry out, the processing behavior of the pole piece is poor, the firmness of the surface coating modification is poor, and the powder is easy to fall off; while the solid state reaction method is difficult to mix the components uniform

Method used

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  • Method for preparing multi-element metal oxide containing nickel-cobalt and method for carrying out surface coating decoration
  • Method for preparing multi-element metal oxide containing nickel-cobalt and method for carrying out surface coating decoration
  • Method for preparing multi-element metal oxide containing nickel-cobalt and method for carrying out surface coating decoration

Examples

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Embodiment 1

[0047] Take nickel (Ni), cobalt (Co), and manganese (Mn) sulfates at a molar ratio of 1:1:1 and mix them to prepare 1 L of an aqueous solution with a total metal content of 1 mole. Under nitrogen atmosphere and constant stirring, Slowly drop it into 1L, 2.2M NaOH aqueous solution at 50°C. After 8 hours, the Ni-Co-Mn composite hydroxide was separated, washed several times with distilled water, and then dried in vacuum at 100°C for 10 hours, and its water content was accurately measured. After one part and lithium hydroxide monohydrate (LiOH·H 2 O) Mixed grinding at a molar ratio of 1:1.06, then placed in an intelligent control muffle furnace, under dry air, the temperature was raised to 300°C at 2°C / min and kept at a constant temperature for 6 hours for the first heat treatment, and then heated at 2°C / min to raise the temperature to 750°C and keep the temperature for 16 hours for sintering, then naturally cool the product to room temperature, grind and sieve to obtain the posi...

Embodiment 2

[0052]Mix nickel (Ni) and cobalt (Co) nitrates at a molar ratio of 8:2 to prepare 1L of an aqueous solution with a total metal content of 2 moles, and slowly drop it into 1L under an argon atmosphere and constant stirring. In 4.4M 50°C KOH aqueous solution, the Ni-Co composite hydroxide was separated after 9 hours, washed several times with distilled water and then dried in vacuum at 120°C for 8 hours, and mixed with lithium hydroxide monohydrate (LiOH·H 2 O) After mixing and grinding at a molar ratio of 1:1.05, place it in an intelligent control muffle furnace. Under dry air, heat up to 320°C at 5°C / min and keep the temperature for 5 hours for the first heat treatment, and then heat at 5°C / min The temperature was raised to 750°C and kept at a constant temperature for 18 hours for sintering, and then the product was naturally cooled to room temperature, ground and sieved to obtain the positive electrode active material LiNi 0.8 co 0.2 o 2 , and then carry out surface coating...

Embodiment 3

[0057] Take nickel (Ni), cobalt (Co), and iron (Fe) sulfates in a molar ratio of 5:3:2 and mix them to prepare 1L of an aqueous solution with a total metal content of 0.9 moles. Under nitrogen atmosphere and constant stirring, Slowly drop it into 1L, 2.2M NaOH aqueous solution at 40°C. After 10 hours, the Ni-Co-Fe composite hydroxide was separated, washed several times with distilled water, dried in vacuum at 120°C for 10 hours, and mixed with hydrogen monohydrate Lithium oxide (LiOH·H 2 O) After mixing and grinding at a molar ratio of 1:1.04, place it in an intelligently controlled muffle furnace. In dry air, heat up to 360°C at 5°C / min and keep the temperature for 7 hours for the first heat treatment, and then heat at 5°C / min. The temperature was raised to 750°C and kept at a constant temperature for 20 hours for sintering, then the product was naturally cooled to room temperature, ground and sieved to obtain the positive electrode active material LiNi 0.5 co 0.3 Fe 0.2 o...

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Abstract

This invention discloses one multiple metal oxidation process method with nickel and cobalt, which comprises the following steps: a, depositing cobalt salt and nickel salt and transition salt mixture by alkali liquor in nitrogen or inertance gas to generate Ni-Co-M compound hydroxide for drying and grinding to get front drive; b, adding lithium hydrate into front drive for grinding and processing the mixture to remove absorbed water or structure water; c, processing the product under temperature of 650 to 850 degrees; d, using high polymer as assistant solvent for surface covering decoration on product; e, processing the product to remove solvent to get multiple metal oxidation, the said transition metal M is from Mn, Fe, Zn, Ti or Cr.

Description

[technical field] [0001] The invention relates to inorganic functional materials and high-energy battery technology, in particular to a preparation method of multi-element metal oxides and cathode materials of lithium-ion secondary batteries. [Background technique] [0002] The preparation of new cathode materials is one of the key technologies restricting the rapid development of lithium secondary batteries. At present, the positive electrode materials commonly used in lithium-ion batteries include lithium cobalt oxide, lithium nickel oxide, and spinel lithium manganese oxide (LiMn 2 o 4 ) and layered lithium manganate (LiMnO 2 ). Lithium cobaltate is currently a commonly used commercial lithium-ion battery cathode material, and its preparation process is very mature, but its wide application is limited due to its poor resources, high price, and poor safety when used as a power battery. Lithium nickelate has the same layered structure as lithium cobaltate, and its prope...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/48H01M4/58C01G1/02C01G51/00C01G53/00H01M4/525
CPCY02E60/12Y02E60/10
Inventor 林云青方送生王守峰陈泽伟曾鹏程
Owner TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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