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A high-voltage monocrystalline ternary material and a preparation method thereof

A ternary material, high-voltage technology, applied in the direction of electrical components, circuits, battery electrodes, etc., can solve the problems of poor contact between materials and binders, conductive agents, poor electrode filling performance, and low tap density

Inactive Publication Date: 2018-12-21
CAIHONG GRP ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the nickel-cobalt lithium manganate ternary materials prepared at home and abroad are spherical secondary particles formed by the aggregation of primary small grains. The tap density of the material is low, generally lower than 2.4g / cm3, and the electrode filling performance is not good. Well, during the rolling process of the electrode sheet, the secondary particles will be broken, resulting in poor contact between the material, the binder and the conductive agent, affecting the compaction density of the electrode and the electrochemical performance of the battery

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  • A high-voltage monocrystalline ternary material and a preparation method thereof

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preparation example Construction

[0024] A method for preparing a high-voltage single crystal nickel-cobalt-manganese ternary material powder, characterized in that it comprises the following steps:

[0025] 1) Co-precipitation method to prepare doped nickel-cobalt-manganese hydroxide precursor

[0026] Co-precipitation is used to make the distribution of the three elements of nickel, cobalt and manganese and doping elements more uniform, which can improve the electrochemical performance of the ternary material; the present invention uses the co-precipitation method to prepare the doped nickel-cobalt-manganese hydroxide precursor, by controlling the process Conditions, so that the center particle size of the oxide co-precipitation body is 3.0-5.0 μm, and reduce super large particles as much as possible. The specific process is as follows:

[0027] According to the chemical formula Ni 0.5 co 0.2 mn 0.3 (OH) 3 Carry out batching, first take required nickel sulfate, cobalt sulfate, manganese sulfate accordin...

Embodiment 1

[0048] Weigh 77.38g of nickel sulfate, 31.00g of cobalt sulfate, 45.30g of manganous sulfate, and dissolve 1.50g of yttrium sulfate in 1L of pure water to form a 1.0mol / L nickel-cobalt-manganese sulfate solution, pour it into an airtight container protected by an inert gas, and heat To 80°C, under rapid stirring conditions, slowly add dilute ammonia water to make the system pH = 3.0-3.5, continue to slowly add NaOH-ammonia water mixed solution to keep the system pH at 11.0-11.5. After the system reaction is completed, it is aged for 5 hours. The obtained precipitate was fully washed with hot deionized water to pH = 7-8, and the precipitate was separated by filtration until the water content reached 50%, and 26.33 g of lithium hydroxide was added to form a paste mixture. After fully stirring, it was vacuum-dried Dry the paste in the same way, then pulverize it, and pass through a 160-mesh sieve. Put the mixture of lithium salt and hydroxide obtained by the above sieving into a...

Embodiment 2

[0050] Weigh 77.38g of nickel sulfate, 31.00g of cobalt sulfate, 45.30g of manganese sulfate, and dissolve 1.05g of tungsten sulfate in 1L of pure water to form a 1.0mol / L nickel-cobalt-manganese sulfate solution, pour it into an airtight container protected by an inert gas, and heat To 85°C, under rapid stirring conditions, slowly add dilute ammonia water to make the system pH = 3.0-3.5, continue to slowly add NaOH-ammonia water mixed solution to maintain the system pH at 11.0-11.5. After the system reaction is completed, it is aged for 5 hours. The obtained precipitate was fully washed with hot deionized water until pH = 7-8, and the precipitate was separated by filtration until the water content reached 50%, and 27.53 g of lithium hydroxide was added to form a paste mixture. After fully stirring, it was vacuum-dried Dry the paste in the same way, then pulverize it, and pass through a 160-mesh sieve. Put the mixture of lithium salt and hydroxide obtained by the above sievin...

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Abstract

The invention discloses a high-voltage single crystal ternary material and a preparation method thereof. The chemical formula of the high-voltage single crystal nickel-cobalt-manganese ternary material in the invention is LiNi0. 5Co0. 2Mn0. 3MxO2, wherein x=0. 01-0.1, coprecipitating Ni-Co-Mn hydroxide coprecipitate body is formed by coprecipitation method, and then proper amount of lithium carbonate or lithium hydroxide is added to form lithium carbonate or lithium hydroxide-Nickel cobalt manganese hydroxide co-sediment mixed paste, mixed with paste, evenly mixed, dried, ground, sieved with 160 mesh sieve, the obtained mixture is loaded into an alumina crucible, put into an oxidation furnace for burning, and the firing temperature is controlled at 900-1050 DEG C, heat preservation 10-15 hour, that sintered body is subject to crushing, airflow classification, surface coating treatment of the alumina sol and low-temperature atmosphere heat treatment to obtain a high-voltage monocrystalline nickel-cobalt-manganese ternary material powder. The invention has the characteristics of good electrochemical characteristics under the high-voltage condition, excellent micro-morphology, simplemanufacturing method and easy industrial production.

Description

technical field [0001] The invention relates to the technical field of cathode materials for lithium-ion batteries, in particular to a high-voltage single crystal ternary material and a preparation method thereof. Background technique [0002] The nickel-cobalt-manganese ternary material was initially obtained by Japanese scholar T.Ohzuku and Canadian scholar J.Dahn by using hydroxide co-precipitation precursors through high-temperature calcination. At present, the nickel-cobalt lithium manganate ternary materials prepared at home and abroad are spherical secondary particles formed by the aggregation of primary small grains. The tap density of the material is low, generally lower than 2.4g / cm3, and the electrode filling performance is not good. Well, during the rolling process of the electrode sheet, the secondary particles will be broken, resulting in poor contact between the material, the binder and the conductive agent, which will affect the compaction density of the elec...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525Y02E60/10
Inventor 李永强王慧萍张斌虎杨欣
Owner CAIHONG GRP ELECTRONICS CO LTD
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