A high-pressure monocrystalline nickel-cobalt-manganese ternary material and a preparation method thereof

A ternary material, nickel-cobalt-manganese technology, applied in the direction of electrode manufacturing, electrical components, electrode heat treatment, etc., can solve the problems of high production cost, complicated process, poor performance, etc., and achieve low corrosion, uniform particle size distribution, and optimized cycle performance effect

Active Publication Date: 2018-12-18
FOSHAN DYNANONIC
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Problems solved by technology

Patent application CN201710994418.2 uses lithium carbonate and ternary precursors to prepare D 50 = 10-12μm ternary material, but after the first sintering, it needs to be crushed, screened, pulped, washed, and dried again; the process is complicated and the production cost is high
Another method to increase the compaction density is to control the morphology of the ternary material by doping, thereby achieving the purpose of increasing the compaction density. Patent document CN201510844880.5 adopts primary sintering, doping, secondary sintering, and liquid phase coating The ternary material is prepared by the alumina process, and its specific surface area is increased by controlling the morphology of the ternary material, thereby increasing its tap density. However, it adopts a liquid phase coating process after the secondary sintering, which is relatively complicated and The obtained ternary product has a relatively high specific surface area and poor performance

Method used

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  • A high-pressure monocrystalline nickel-cobalt-manganese ternary material and a preparation method thereof
  • A high-pressure monocrystalline nickel-cobalt-manganese ternary material and a preparation method thereof
  • A high-pressure monocrystalline nickel-cobalt-manganese ternary material and a preparation method thereof

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preparation example Construction

[0037] The invention provides a method for preparing a high-pressure compacted single crystal nickel-cobalt-manganese ternary material, which comprises the steps of:

[0038] (1) Preparation of Ni by co-precipitation method 1-x-y co x mn y (OH) 2 Precursor;

[0039] Wherein: 0

[0040] Co-precipitation method is to use nickel-cobalt-manganese salts to co-precipitate in the solution to prepare the precursor. Ternary materials with various shapes such as shell structure, spherical shape, and nanoflowers, and relatively uniform particle size distribution, thus effectively ensuring the shape of the precursor of the ternary material and improving the compaction density.

[0041] Preferably, the described adopt coprecipitation method to prepare Ni 1-x-y co x mn y (OH) 2 The precursor includes the following steps:

[...

Embodiment 1

[0078] Preparation:

[0079] (1) Mix nickel sulfate, cobalt sulfate and manganese sulfate uniformly according to the molar ratio of Ni:Co:Mn=0.5:0.25:0.25 to obtain 1 mol / L solution A. Weigh sodium hydroxide and add deionized water to prepare a 5 mol / L solution B; weigh 20% concentrated ammonia water to prepare a 3.6 mol / L solution C.

[0080](2) Weigh 300g, 500g, and 100g of the above solution A, solution B, and solution C respectively, add 1000g of pure water to the reactor, add solution A, solution B, and solution C to the reactor at the same time, and the stirring rate of the reactor Controlled at 600rpm. The reaction process needs to be fed with nitrogen for protection, the flow rate is 13L / min, the reaction temperature is kept at 50°C, the pH is kept at 8.5-10.5, and the reaction time is 45h.

[0081] (3) After the reaction is completed, the slurry is suction filtered, washed and dried to obtain a precursor.

[0082] (4) Weigh 1500 g of lithium carbonate and the precu...

Embodiment 2

[0088] Preparation:

[0089] (1) Mix nickel sulfate, cobalt sulfate, and manganese sulfate uniformly according to the molar ratio of Ni:Co:Mn=0.5:0.2:0.3 to obtain a solution A of 1.8 mol / L. Weigh sodium hydroxide and add deionized water to prepare a 5 mol / L solution B; weigh 20% concentrated ammonia water to prepare a 3.8 mol / L solution C.

[0090] (2) Weigh 350g, 550g, and 100g of the above-mentioned solution A, solution B, and solution C respectively, add 1500g of pure water to the reactor, add solution A, solution B, and solution C to the reactor at the same time, and the stirring rate of the reactor Controlled at 700rpm. The reaction process needs to be fed with nitrogen for protection, the flow rate is 20L / min, the reaction temperature is kept at 60°C, the pH is kept at 9-11, and the reaction time is 48h.

[0091] (3) After the reaction is completed, the slurry is suction filtered, washed and dried to obtain a precursor.

[0092] (4) Lithium carbonate and precursor we...

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Abstract

The invention discloses a preparation method of a high-pressure monocrystalline nickel-cobalt-manganese ternary material, comprising the steps of preparing a precursor by a co-precipitation method; mixing a lithium source, a coating agent and the precursor and performing primary sintering to obtain an intermediate; mixing the intermediate and the lithium source in proportion, and performing secondary sintering and shaping to obtain the product The invention effectively improves the average particle size of the ternary material, reduces the specific surface area of the ternary material, furtherimproves the compaction density, improves the first charge-discharge capacity and improves the cycle performance of the ternary material battery through the process of solid-state coating and sintering of two times.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium ion batteries, and in particular relates to a high-pressure compacted single-crystal nickel-cobalt-manganese ternary material and a preparation method thereof. Background technique [0002] Nickel-cobalt-manganese ternary materials have the advantages of high voltage platform, large reversible specific capacity, stable structure, good safety performance, etc., and at the same time, they are cheap; they are currently the research hotspots of new lithium-ion battery cathode materials. However, nickel-cobalt-lithium manganese oxide ternary materials also have certain shortcomings in the actual application process, such as low initial Coulombic efficiency, poor cycle performance, difficult to control composition and morphology, and low tap density. These shortcomings have greatly affected the popularization and application of nickel-cobalt-manganese ternary materials. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M4/04H01M10/0525
CPCH01M4/0471H01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 李正松孔令涌许雯婷
Owner FOSHAN DYNANONIC
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