Small-granule monocrystal lithium nickel cobalt manganate positive electrode material and preparation method therefor

A technology of nickel-cobalt-lithium-manganese-manganate and positive-electrode materials, applied in chemical instruments and methods, battery electrodes, nickel compounds, etc., can solve the problem of reduced output of small-particle single-crystal nickel-cobalt-lithium-manganese-manganese ternary materials and large-particle spherical precursors Reduced market utilization rate, low output of small particle precursors, etc., to achieve the effect of improving high temperature gas production, excellent electrochemical performance, and small particle size

Inactive Publication Date: 2017-04-26
GUANGDONG BRUNP RECYCLING TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, with the continuous application of ternary materials in the field of high-voltage batteries and power batteries, the problem of battery expansion caused by high-temperature gas production has been paid more and more attention. Therefore, it is necessary to prepare a small-particle single-crystal nickel-cobalt-lithium manganese oxide material to solve the problem. this question
However, small-grain precursors are generally used to prep

Method used

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  • Small-granule monocrystal lithium nickel cobalt manganate positive electrode material and preparation method therefor
  • Small-granule monocrystal lithium nickel cobalt manganate positive electrode material and preparation method therefor
  • Small-granule monocrystal lithium nickel cobalt manganate positive electrode material and preparation method therefor

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Effect test

Embodiment 1

[0034] The large-particle spherical nickel-cobalt-manganese precursor (Ni 0.5 co 0.2 mn 0.3 (OH) 2 , the average particle size is 12 μm) is mechanically finely ground into pieces, and then it and alumina (alumina content is 0.6%) are added to water and ethanol mixed solvent (ethanol volume content 30%) to carry out uniform stirring, and then passed The spray-drying method makes the precursor fragments assemble into a spherical shape to achieve the purpose of embedding the metal additive into the spherical interior to obtain a mixture A, and then the mixture A and lithium carbonate (mass content of lithium carbonate is 43%) are mixed by ball milling, and the resulting mixture is heated at 960 ° C After sintering for 14 hours, after cooling to room temperature, jet milling and passing through a 400-mesh sieve to obtain the nickel-cobalt-lithium-manganese-oxide positive electrode material, the scanning electron microscope shows figure 1 As shown, the positive electrode materia...

Embodiment 2

[0036] The large-particle spherical nickel-cobalt-manganese precursor (Ni 0.5 co 0.25 mn 0.25 (OH) 2 , the average particle size is 15 μm) is mechanically ground into fragments, and then it and antimony trioxide (antimony trioxide mass content is 1%) are added in water and ethanol mixed solvent (ethanol volume content is 40%) Stir evenly, then make the precursor fragments assemble into a spherical shape by spray drying to achieve the purpose of metal additives embedded in the spherical interior, to obtain mixture A, and then mix A with lithium carbonate (mass content of lithium carbonate is 45%) by ball milling , the resulting mixture was sintered at 910°C for 15h, cooled to room temperature, airflow pulverized, and passed through a 400-mesh sieve to obtain the nickel-cobalt-lithium-manganese-oxide positive electrode material, as shown in the scanning electron microscope figure 2 As shown, the positive electrode material is a single crystal particle and the particle is uni...

Embodiment 3

[0038] The large-particle spherical nickel-cobalt-manganese precursor (Ni 1 / 3 co 1 / 3 mn 1 / 3 (OH) 2 , the average particle size is 18 μm) is mechanically finely ground into fragments, and then it and zirconium dioxide (zirconium dioxide mass content is 1.5%) are added in water and ethanol mixed solvent (ethanol volume content is 50%) for uniform Stirring, followed by spray drying to make the precursor fragments assembled into a spherical shape to achieve the purpose of metal additives embedded in the spherical interior, to obtain a mixture A, and then mix the mixture A and lithium acetate (mass content of lithium acetate is 48%) by ball milling, the obtained The mixture was sintered at 990°C for 18 hours, cooled to room temperature, airflow pulverized, and passed through a 400-mesh sieve to obtain the nickel-cobalt-lithium-manganese-oxide positive electrode material, as shown in the scanning electron microscope. image 3 As shown, the positive electrode material is a single ...

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Abstract

The invention belongs to the technical field of a lithium ion battery, and discloses a small-granule monocrystal lithium nickel cobalt manganate positive electrode material and a preparation method therefor. The preparation method comprises the following steps of grinding a big-granule spherical nickel cobalt manganese precursor into fragments, and adding the fragments and a metal additive into a mixed solution of water and ethyl alcohol, stirring uniformly, and spraying and drying to obtain a mixture A; and mixing the mixture A with a lithium source and grinding the mixture, sintering at a temperature of 600-1,200 DEG C for 8-30h, and performing cooling, air flow smashing and sieving to obtain the small-granule monocrystal lithium nickel cobalt manganate positive electrode material, wherein the granule dimensions are small and uniform, the average dimensions are 2-4.5[mu]m, and the specific surface area is 0.5-1.5m<2>/g, so that the structural stability of the positive electrode material is effectively improved. The lithium nickel cobalt manganate positive electrode material adopts monocrystal appearance, so that the problem of high temperature gas production of a ternary material can be effectively relieved; and meanwhile, the compaction density of a battery electrode plate is improved, the energy density of the material can be highly improved consequently, and excellent electrochemical property is achieved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a small particle single crystal nickel cobalt lithium manganese oxide positive electrode material and a preparation method thereof. Background technique [0002] In recent years, the country has implemented a series of policies on new energy vehicles, which has greatly promoted the rapid development of power battery cathode materials. Due to the demand for high specific energy batteries in cars and the use of high-power and long-life batteries in passenger cars, the technical route makes ternary materials a better choice for cathode materials. It can be seen that ternary materials are facing huge opportunities in the power battery market. In 2016, the demand for cathode materials for power batteries further increased, especially the market share of ternary materials with excellent performance was further expanded. [0003] At present, with the continuo...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525C01G53/00
CPCC01G53/006C01P2004/03C01P2004/61C01P2006/12C01P2006/40H01M4/505H01M4/525H01M10/0525H01M2220/20Y02E60/10
Inventor 刘伟健唐盛贺张莹娇吴剑麟
Owner GUANGDONG BRUNP RECYCLING TECH
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