Laminated ternary positive material and preparation method thereof

A cathode material and layered technology, applied in the field of layered ternary cathode materials and their preparation, can solve the problems of low "energy/price" value, complicated preparation process, expensive price, etc., and achieve high consistency and high energy density , The effect of reducing the process cost

Active Publication Date: 2011-05-25
BTR NEW MATERIAL GRP CO LTD
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Problems solved by technology

Compared with other secondary batteries for energy storage, lithium-ion batteries have the advantages of high energy density and long cycle life, and are considered to be the best choice for vehicle batteries or power batteries. However, due to the high price of lithium-ion batteries, As a result, its "energy / price" value is still low, so the problem that needs to be solved urgently is to greatly increase its energy density and reduce its price. For this reason, it is necessary to increase the operating voltage of its cathode material and use a low-cost cathode material. There are two types of positive electrode materials for lithium-ion batteries: LiMn 1.5 Ni 0.5 o 4 (discharge voltage platform 4.6V), Li 1+x (MnNiCo) 1-x o 2 A series of positive electrode materials (can be charged to 5.0V), capacity greater than 250mAh / g, stable structure, the preparation process of the above materials is complicated, resulting in higher prices

Method used

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  • Laminated ternary positive material and preparation method thereof
  • Laminated ternary positive material and preparation method thereof
  • Laminated ternary positive material and preparation method thereof

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preparation example Construction

[0016] In summary, the preparation method of the layered ternary cathode material according to the present invention includes steps: step 1: preparing a precursor mixture with spheroidization; step 2: sintering the spheroidization precursor mixture to synthesize aLi 2 MnO 3 ·(1-a)LiMn (1-x-y) Ni x co y o 2 positive electrode material, where 02 MnO 3 ·(1-a)LiMn (1-x-y) Ni x co y o 2 / M layered ternary cathode material, where M is Al 2 o 3 、TiO 2 , ZrO 2 , La 2 o 3 , ZnO or MgO, the layered ternary positive electrode material has a layered structure of R-3m space group, contains three elements of nickel, cobalt and manganese, and has a spherical shape, an approximate spherical shape, a diamond shape, and a cone shape with a long-short axis ratio of 1 to 5 , flaky, layered or blocky microscopic features, with a particle size of 5-40 μm and a specific surface area of ​​0.2-10 m 2 / g.

[0017] In the preparation method of the layered ternary cathode material accordi...

Embodiment 1

[0045]The speed 50L / h that solution injects reactor, sodium hydroxide 2mol / L, nickel sulfate 2.33mol / L, manganese sulfate 5.33mol / L, cobalt sulfate 2.33mol / L, additive hydrazine 1wt%, press precursor (nickel+cobalt + manganese): the molar ratio of lithium is 0.77:1, the rotating speed of the ball mill is 200r / min, and the time is 2h to obtain the spheroidized precursor mixture; Speed, heating up to 950°C, sintering for 10h, continuously feeding dry oxygen during the sintering process, flow rate 500mL / min, to obtain 0.3Li 2 MnO 3 0.7LiMn 1 / 3 Ni 1 / 3 co 1 / 3 o 2 Positive electrode material: put the obtained positive electrode material in a box furnace, heat up to 600°C at a heating rate of 5°C / min, keep it warm for 10h, and then naturally cool to room temperature, and then crush, classify, and sieve; titanate Dissolved in ethanol, converted into corresponding oxides accounted for 0.5% of the mass of the positive electrode material, slowly added the crushed, sieved, and classi...

Embodiment 2

[0047] The speed 100L / h that solution injects reactor, potassium hydroxide 8mol / L, nickel chloride 6mol / L, manganese chloride 8mol / L, cobalt chloride 6mol / L, additive ethylenediamine 2wt%, press precursor (nickel + cobalt + manganese): the molar ratio of lithium is 0.91:1, the rotating speed of the ball mill is 100r / min, and the time is 40h to obtain the spheroidized precursor mixture; The heating rate is increased to 700°C, sintered for 24 hours, and dry air is continuously introduced during the sintering process, the flow rate is 1000mL / min, and 0.1Li 2 MnO 3 0.9LiMn 1 / 3 Ni 1 / 3 co 1 / 3 o 2 Positive electrode material: put the obtained positive electrode material in a box furnace, heat up to 500°C at a heating rate of 10°C / min, keep it warm for 24h, and then naturally cool to room temperature, and then crush, classify, and sieve; the zirconate Dissolved in acetone, converted into corresponding oxides accounted for 5% of the mass of the positive electrode material, slowly ...

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Abstract

The invention provides a laminated ternary positive material and a preparation method thereof. The chemical formula of the laminated ternary positive material is aLi2MnO3.(1-a)LiMn(1-x-y)NixCoyO2/M, wherein a is more than 0 and less than 1; x is more than 0 and less than 1; y is more than 0 and less than 1; and M is aluminium oxide (Al2O3), titanium dioxide (TiO2), zirconium oxide (ZrO2), lanthanum oxide (La2O3), zinc oxide (ZnO) or magnesium oxide (MgO). The preparation method comprises the following steps of: preparing a precursor mixture; sintering the precursor mixture in a sintering furnace to synthesize a aLi2MnO3.(1-a)LiMn(1-x-y)NixCoyO2 positive material; and performing compounding to obtain the aLi2MnO3.(1-a)LiMn(1-x-y)NixCoyO2/M material. The laminated ternary positive material has high energy density, a stable high-voltage charging and discharging structure, a simple preparation process and low production cost.

Description

technical field [0001] The invention relates to, in particular, a lithium-ion battery positive electrode material and a preparation method thereof, in particular to a layered ternary positive electrode material and a preparation method thereof. Background technique [0002] The deterioration of the environment and the shortage of energy have prompted people to accelerate the research process on the new energy industry. Scientists have made efforts for at least ten years. The results of comprehensive research on various aspects show that the best way to alleviate the above crises is to use clean energy. New energy sources such as wind, solar, geothermal, tidal and hydroelectric power - all come from wind, water and sunlight (known as WWS-wind, water, sunlight). As a clean energy storage device that can store electrical energy, lithium-ion batteries have become a research hotspot. Compared with other secondary batteries for energy storage, lithium-ion batteries have the advan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/1391H01M4/131
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 岳敏程林梁奇黄友元陈春天
Owner BTR NEW MATERIAL GRP CO LTD
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