Complex metal oxide and its preparation process

A composite metal and oxide technology, applied in the field of electrochemistry, can solve the problems of poor particle uniformity and shape regularity, inability to be used as high-efficiency battery electrode materials, and unsatisfactory material conductivity, etc., to achieve a combination Strong and uniform, excellent electrochemical cycle performance, and good film processing behavior

Active Publication Date: 2011-06-29
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the composite metal oxides currently on the market are calcined by various salts containing metal components at a temperature above 1,000°C. As a result, the obtained materials have a small surface area, and the particle uniformity and shape regularity are not very good.
Therefore, when it is physically mixed with the conductive agent, the contact between them is not ideal, and the conductivity of the mixed material is not satisfactory, resulting in poor cycle performance of the battery.
Therefore, this composite metal oxide cannot be used as an electrode material for high-efficiency batteries

Method used

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  • Complex metal oxide and its preparation process

Examples

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Embodiment 1

[0042] Take nickel (Ni), cobalt (Co) and manganese (Mn) sulfates at a molar ratio of 0.4:0.4:0.2 to make a 2M solution with 10 moles of nickel (Ni), cobalt (Co) and manganese (Mn) sulfate, and add water slowly under constant stirring. In a buffer solution with a pH value of 8, 10 L of nickel-cobalt-manganese-ammonia complex solution was prepared. Under the condition of constant stirring, slowly drop it and 10L, 4.4M NaOH aqueous solution into the reaction kettle filled with 7L aqueous solution and adjust its pH value to 11 with 4.4M pure NaOH solution, the reaction temperature is 40°C, and the stirring speed is 400rpm. After 6 hours, the Ni-Co-Mn composite hydroxide was isolated. After aging for 2 hours, it was washed several times with distilled water and then dried at 80°C for 16 hours. After grinding and sieving, the precursor was obtained, and its water content (by After determining the weighing weight of lithium hydroxide) and lithium hydroxide monohydrate (LiOH·H 2 O) ...

Embodiment 2

[0046] Take 5 moles of nickel (Ni), cobalt (Co) and magnesium (Mg) nitrates in a molar ratio of 0.5:0.3:0.2 and add water to form a 1M solution, and slowly add ammonia water and ammonium sulfate under constant stirring. In a buffer solution with a pH value of 10, 10L of nickel-cobalt-magnesium-ammonia complex solution was prepared. Under constant stirring, it was slowly dropped into 7L of aqueous solution with 2.2M pure NaOH at the same time. The solution was adjusted to a pH value of 11 in a reaction kettle, the reaction temperature was 50° C., and the stirring speed was 400 rpm. After 8 hours, the Ni-Co-Mg composite hydroxide was isolated. After aging for 2 hours, it was washed several times with distilled water and then dried at 80°C for 16 hours. After grinding and sieving, the precursor was obtained. Lithium carbonate is mixed and ground at a molar ratio of 1:0.55 and then placed in an intelligently controlled muffle furnace. In dry air, the temperature is raised to 320°C...

Embodiment 3

[0050] Take 8 moles of nickel (Ni), cobalt (Co) and manganese (Mn) carbonates at a molar ratio of 0.6:0.3:0.1 and add water to form a 1.5M solution, and slowly add ammonia water and sulfuric acid under constant stirring. In the buffer solution with a pH value of 8.5 prepared by amine, 10L of nickel-cobalt-manganese-ammonia complex solution was prepared. Under the condition of constant stirring, it was slowly dropped into 7L of aqueous solution with 3.3M NaOH solution at the same time. The pure NaOH solution is placed in a reaction kettle whose pH value is adjusted to 11.5, the reaction temperature is 55° C., and the stirring speed is 500 rpm. After 8 hours, the Ni-Co-Mn composite hydroxide was isolated. After aging for 2 hours, it was washed several times with distilled water and then dried at 80°C for 16 hours. After grinding and sieving, the precursor was obtained. Lithium acetate is mixed and ground at a molar ratio of 1:1.08 and then placed in an intelligently controlled m...

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Abstract

The present invention discloses a complex metal oxide in the general formula of LiaNi1-x-yCoxMyO2, where, a is 0.97-1.15, x is 0.1-1, y is 0.05-0.35, and M is Mn or Mg, and with attached conducting carbon layer in the surface of the crystal grain. The present invention also discloses the preparation process of the complex metal oxide. The conducting matter of the material of the present invention is attached to the surface of complex metal oxide through chemical plating, has certain binding force, binds firmly and and homogeneously, thus better solveing the problem of poor consistence of battery performance caused by inhomogeneous physical mixing of complex metal oxide and conducting matter, which may cause non-optimal battery performance .

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a carbon-doped lithium-nickel-cobalt composite metal oxide suitable for battery electrode materials and a preparation method thereof. Background technique [0002] Typically, composite metal oxides are thermally stable, but not electrically conductive, or semiconducting. It is therefore difficult to use composite metal oxides as electrode materials requiring high conductivity. In fact, research has been ongoing on methods for producing composite metal oxides with high electrical conductivity and high thermal stability required for electrode materials. [0003] In the prior art, in order to make the composite metal oxide conductive, the composite metal oxide is often physically mixed with a conductor (such as carbon black). However, in the electrode material prepared by this physical method, the compound metal oxide is mixed unevenly with the conductor, so the conductivity is not...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G1/00H01M4/58
CPCY02E60/10
Inventor 方送生
Owner SHENZHEN BAK POWER BATTERY CO LTD
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