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Method for preparing ternary positive electrode material of lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, electrical components, secondary batteries, etc., can solve problems such as poor electrochemical performance, long production cycle, and narrow median particle size range, and achieve volume improvement Effects of energy density, improved space utilization, and improved thermal stability

Active Publication Date: 2014-05-21
QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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Problems solved by technology

However, the compaction density of the material is small, and the low volumetric energy density has become an important factor restricting its application.
Chinese Patent Application Publication CN101847722A points out that the compaction density of the ternary material is improved by grinding the micron precursor to the nanometer level and then sintering the micron-scale single crystal particles at high temperature, but this preparation method is easy to cause the particle Agglomeration, uneven particle size distribution
Chinese Patent Application Publication CN101621125A pointed out that by adding polyvinyl alcohol in the grinding process, the dispersion of particles is improved, and multi-step sintering is used to prepare single crystal particles with better dispersion and higher compaction, but the preparation process is complicated , long production cycle
Chinese patent application publication CN102593442A points out: adopt nickel-cobalt-manganese oxide and lithium carbonate with specific median particle size, according to certain calcination temperature and atmosphere to prepare high-pressure lithium battery anode material, but this method is to the medium of raw material The particle size range is required to be narrow, so its application is limited
Chinese patent application publication CN102709541A pointed out that high-density nickel-cobalt-lithium-manganate positive electrode material is prepared by solvothermal method, but its preparation process is complex and unfavorable for large-scale production
However, unlike lithium cobalt oxide, the electrochemical performance is poor when the single crystal or single crystal-like grains of the ternary material are large, so it is not possible to combine single crystal or single-crystal-like particles with different particle sizes like lithium cobalt oxide. Mixed use, other methods must be invented

Method used

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  • Method for preparing ternary positive electrode material of lithium ion battery
  • Method for preparing ternary positive electrode material of lithium ion battery
  • Method for preparing ternary positive electrode material of lithium ion battery

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Experimental program
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specific Embodiment 1

[0040] Lithium carbonate (lithium source) and a nickel-cobalt-manganese-aluminum hydroxide precursor (chemical formula Ni 0.5 co 0.1 mn 0.3 Al 0.1 (OH) 2.1 The atomic ratio of Li:(Ni+Co+Mn+Al) is 1.20:1.0 and mixed by ball milling for 4 hours; the mixed raw materials are placed in a roaster and roasted at 800°C for 24 hours in an air atmosphere; the roasted product First pass coarse crushing, and then use jet mill for fine crushing to obtain the average particle size D 50 Agglomerate material A of 25um, whose chemical formula is Li 1.2 Ni 0.5 co 0.1 mn 0.3 Al 0.1 o 2 ;

[0041] Lithium hydroxide (lithium source) and another nickel-cobalt-manganese hydroxide precursor (chemical formula Ni 0.5 co 0.2 mn 0.3 (OH) 2 According to the atomic ratio of Li: (Ni+Co+Mn) of 1.20:1.0 ball milling and mixing for 4 hours; put the mixed raw materials in a roasting furnace, and roast them at 1100°C for 6 hours in an air atmosphere; pass the roasted products through After coarse ...

specific Embodiment 2

[0044] According to the atomic ratio of Li:(Ni+Co+Mn+Mg) is 1.03:1.0, lithium carbonate (lithium source) and a nickel-cobalt-manganese-magnesium hydroxide precursor (chemical formula Ni 0.4 co 0.2 mn 0.3 Mg 0.1 (OH) 2 , mixed by ball milling for 4 hours; the mixed raw materials were placed in a roaster and roasted at 1100°C for 6 hours in an air atmosphere; the roasted product was first coarsely crushed, and then finely crushed by a jet mill. The average particle size of the powder D. 50 The aggregate material A is 8um, and its chemical formula is Li 1.03 Ni 0.4 co 0.2 mn 0.3 Mg 0.1 o 2 ;

[0045] According to the atomic ratio of Li:(Ni+Co+Mn+Al) of 1.01:1.0, lithium hydroxide (lithium source) and another nickel-cobalt-manganese-aluminum hydroxide precursor (chemical formula Ni 0.5 co 0.1 mn 0.3 Al 0.1 (OH) 2.1 , mixed by ball milling for 4 hours; the mixed raw materials were placed in a roaster and roasted at 800°C for 24 hours in an air atmosphere; the roasted...

specific Embodiment 3

[0048] According to the atomic ratio of Li:(Ni+Co+Mn) of 1.06:1.0, lithium carbonate (lithium source) and a nickel-cobalt-manganese hydroxide precursor (chemical formula Ni 0.5 co 0.2 mn 0.3 (OH) 2 , mixed by ball milling for 4 hours; the mixed raw materials were placed in a roaster and roasted at 960°C for 10 hours in an air atmosphere; the roasted product was first coarsely crushed, and then finely crushed by a jet mill. The average particle size of the powder D50 is 10um aggregate material A, its chemical formula is Li 1.06 Ni 0.5 co 0.2 mn 0.3 o 2 .

[0049] According to the Li:(Ni+Co+Mn) atomic ratio of 1.06:1.0, lithium carbonate (lithium source) and another nickel-cobalt-manganese hydroxide precursor (chemical formula Ni 0.5 co 0.2 mn 0.3 (OH) 2 , mixed by ball milling for 4 hours; the mixed raw materials were placed in a roaster and roasted at 960°C for 10 hours in an air atmosphere; the roasted product was first coarsely crushed, and then finely crushed by ...

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Abstract

The invention relates to a method for preparing a ternary positive electrode material of a lithium ion battery. The method comprises the following steps: preparing an aggregate material A from a lithium source and a precursor, preparing a single-crystal or single crystal-like material B from a lithium source and a precursor, uniformly mixing the aggregate material A and the single-crystal or single crystal-like material B, sintering to form a material C, and coating powder of the material C with a coating, thereby obtaining the lithium-ion ternary positive electrode material. The aggregates with different granularity and shapes and the single-crystal or single crystal-like ternary material are mixed, and single-crystal particles can be effectively arranged among aggregate particles, so that the graded material is in full contact with a conductive agent and an adhesive, the space utilization rate and the compaction density of the material can be improved, the volume energy density of the material is improved, the electrical property of the material is fully exerted, the effect of heat stability of the material is improved, and the safety of the battery is improved.

Description

technical field [0001] The invention relates to the preparation of lithium-ion battery cathode materials, in particular to a preparation method of lithium-ion battery ternary cathode materials. Background technique [0002] As a new type of secondary battery, lithium-ion batteries have the characteristics of high specific capacity, long cycle life, and good safety. They are widely used as driving power sources for portable electrical appliances such as mobile phones and notebook computers. With the continuous upgrading of electronic products and the development of electric vehicles and hybrid vehicles, the requirements for battery energy density continue to increase. [0003] Under the premise of the same capacity, the market needs to continuously increase the volume energy density of the battery, that is, to increase the filling amount per unit volume of the battery active material. At present, commercial lithium-ion battery cathode materials are mainly divided into three ...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 尚怀芳黄震雷韩坤明苏乔左自成周恒辉
Owner QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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