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Modified lithium ion battery positive electrode material and preparation method therefor

A lithium-ion battery, cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as battery flatulence, hindering the charge transfer process at the interface of electrode materials, affecting the electrochemical performance of materials, etc.

Inactive Publication Date: 2016-04-06
ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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Problems solved by technology

[0006] However, lithium nickel cobalt aluminate also has the following problems: the electrochemical active center is Ni 3+ / Ni 4+ , there are a large amount of strong oxidizing Ni in the positive electrode material after highly delithiated 4+ , Ni 4+ It will cause the electrolyte to oxidize and decompose on the surface of the positive electrode material to form SEI (interface electrolyte film), accompanied by CO 2 The generation of such gases not only hinders the charge transfer process of the electrode material / electrolyte interface, but also causes battery flatulence; during the process of repeatedly de-intercalating lithium batteries on the positive electrode material, an irreversible phase transition will occur on the surface of the positive electrode material, that is, from the hexagonal phase to the electrochemically inert one. The rock salt phase changes to form NiO, accompanied by the release of oxygen, which not only damages the electrochemical performance of the battery, but also causes battery safety hazards; the high-nickel cathode material is highly alkaline and easily absorbs moisture and CO in the air 2 , to generate electrochemically inert Li on the surface of the positive electrode particles 2 CO 3 , blocking the transport channel of lithium ions
[0007] In order to improve the interface properties of high-nickel cathode materials, it has been reported in the prior art to coat the surface with Al 2 o 3 , SiO 2 、TiO 2 , ZrO 2 However, these methods still have problems such as limited improvement in battery performance and cumbersome processes, especially in the coating process, which may involve the use of water as a solvent, causing damage to the surface structure of the positive electrode material. Affect the electrochemical performance of the material

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  • Modified lithium ion battery positive electrode material and preparation method therefor
  • Modified lithium ion battery positive electrode material and preparation method therefor
  • Modified lithium ion battery positive electrode material and preparation method therefor

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preparation example Construction

[0039] The present invention also provides a kind of preparation method of modified lithium-ion battery cathode material, is characterized in that, comprises the following steps:

[0040] a), the Ni 0.8 co 0.15 al 0.05 (OH) 2.05 After ultrasonic dispersion with the first solvent, the first solution is obtained;

[0041] b) Mix the first solution obtained in the above steps with the second solution, obtain a third solution after ultrasonic dispersion, and then dry to obtain a mixed powder; the second solution includes an aqueous solution or an ethanol solution of the coating ;

[0042] c), calcining after mixing the above-mentioned mixed powder with the lithium source compound to obtain a positive electrode material for a modified lithium-ion battery;

[0043] In the present invention, Ni 0.8 co 0.15 al 0.05 (OH) 2.05 After ultrasonically dispersing with the first solvent, the first solution is obtained; the first solvent is preferably one or more of water, ethanol and...

Embodiment 1

[0064] First, 1.38g of Ni 0.8 co 0.15 Al 0.05 (OH) 2.05 and 20mL of absolute ethanol for 30min ultrasonic dispersion to obtain the first solution.

[0065] Then weigh 0.8976g of isopropyl titanate and 0.3034g of acetylacetone to prepare 20ml of absolute ethanol solution to obtain the second solution; take 15ml of the second solution and drop it into the first solution, and ultrasonically disperse it for 30min to obtain the third solution; the third solution was magnetically stirred in a water bath at 40°C, and after the solvent evaporated, the powder was dried in a vacuum oven at 120°C for 4 hours to obtain a mixed powder.

[0066] Then weigh 0.5749g of Li 2 CO 3 Grind and mix with the above mixed powder, place the mixed powder in a vacuum tube furnace, and 3 / h in an oxygen-enriched atmosphere, pre-calcined at 3°C / min to 500°C for 6h, then raised to 750°C at 1°C / min for 12h, and finally annealed at 2°C / min to 500°C for 3h, and obtained 0.98LiNi after cooling 0.8 co 0....

Embodiment 2

[0072] First, 1.38g of Ni 0.8 co 0.15 Al 0.05 (OH) 2.05 and 15 mL of deionized water for ultrasonic dispersion for 30 min to obtain the first solution.

[0073] Then weigh 0.2049g of LiOH·H 2 O was made into 25ml aqueous solution to obtain the aqueous solution of the hydrolysis initiator, and then weighed 0.5809g of NH 4 h 2 PO 4 Make 25ml of aqueous solution to obtain the aqueous solution of the coating; take 1.5ml of the aqueous solution of the coating and drop it into the first solution, ultrasonically disperse it for 30 minutes, and then drop it into the aqueous solution of the hydrolysis initiator to obtain the third solution; put the third solution in Stir magnetically in a water bath at 40°C. After the solvent evaporates, dry the powder in a vacuum oven at 120°C for 4 hours to obtain a mixed powder.

[0074] Then weigh 0.5708g of Li 2 CO 3 Grind and mix with the above-mentioned dried powder, put the mixed powder in a vacuum tube furnace, under the oxygen flow o...

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Abstract

The invention provides a modified lithium ion battery positive electrode material. The modified lithium ion battery positive electrode material is characterized in that LiNi0.8Co0.15Al0.05O2 is taken as a core and a lithium-containing composite oxide is taken as a shell; and the lithium-containing composite oxide is selected from one or more of Li2TiO3, Li2SiO3, Li4SiO4, Li3PO4, Li4P2O7 and Li2ZrO3. According to the surface modified nickel cobalt lithium aluminate positive electrode material provided by the invention, a coating material with electronic conductivity or lithium ion conductivity is taken as the shell, so that the modified material has a surface layer with a lithium ion conductivity property; a surface solid solution layer with stable chemical stability endows the nickel cobalt lithium aluminate positive electrode material and an electrolyte with high interfacial compatibility and interfacial structural stability, so that the charge-discharge cycling stability of the product is improved.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a modified lithium-ion battery cathode material and a preparation method thereof. Background technique [0002] At present, human beings are facing the dual challenges of resource estimation and living environment deterioration. To this end, countries around the world are working hard to develop new materials, promote new concepts of low-carbon life, and promote human society to shift from the current high-energy consumption and high-consumption life and production mode to energy-saving, recyclable and sustainable development. Specifically, vigorously promote the application of clean energy, such as the application of solar energy and wind energy in the field of power generation, and the use of hybrid electric vehicles or pure electric vehicles to replace traditional gasoline-powered vehicles. [0003] The application of clean energy and new vehicles is inseparable from medium and large...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/1391
CPCY02E60/10
Inventor 许晓雄尹景云高超彭刚黄冰心
Owner ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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