Modified lithium nickel-cobalt-manganese ternary positive electrode material and preparation method thereof

A lithium-nickel-cobalt-manganese ternary and positive electrode material technology, which is applied in the field of lithium-ion batteries, can solve problems such as the structure of lithium-nickel-cobalt-manganese ternary positive electrode materials that are easily damaged, the content of impurity lithium increases, and the discharge specific capacity of lithium-ion batteries decays. , to achieve the effect of improving cycle performance, reducing reaction, and facilitating industrial production

Active Publication Date: 2014-04-30
DONGGUAN AMPEREX TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, coating the crystalline lithium fast ion conductor on the surface of the lithium-nickel-cobalt-manganese ternary positive electrode material needs to be processed at a temperature higher than 750°C. When coating at this high temperature, the content of impurity lit

Method used

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  • Modified lithium nickel-cobalt-manganese ternary positive electrode material and preparation method thereof

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[0015] The preparation method of the modified lithium-nickel-cobalt-manganese ternary positive electrode material according to the second aspect of the present invention comprises the steps of: (1) adding lithium salt and M salt into an organic solvent, and continuously stirring until the lithium salt and M salt are fully dissolved in an organic solvent to obtain a homogeneous solution, then add the N salt into the obtained homogeneous solution, continuously stir for 0.5h to 8h, then add lithium nickel cobalt manganese ternary positive electrode material, and continue to stir for 2h to 6h to obtain a mixed solution, wherein The molar ratio of the lithium element in the lithium salt, the M element in the M salt, and the N element in the N salt is x:y:1, 0x m y NO 3 A coated lithium-nickel-cobalt-manganese ternary cathode material, wherein 0

[0016] In the preparation method of the modified...

Embodiment 1

[0034] Add 0.004g of lithium nitrate and 0.302g of lanthanum nitrate hexahydrate into 253ml of absolute ethanol, stir until lanthanum nitrate hexahydrate and lithium nitrate are fully dissolved in absolute ethanol; continue to add 0.305g of isopropyl titanate, stir for 3h, and form Milky white liquid, LiNi 0.5 co 0.2 mn 0.3 o 2 Add the ternary positive electrode material into the milky white liquid, and continue to stir for 4 hours to obtain a mixed solution; filter the mixed solution with suction, dry the obtained filter cake in an oven, heat to 600°C in an oxygen-containing atmosphere, and keep it at 600°C for 4 hours. That is, the amorphous Li 0.05 La 0.65 TiO 3 Coated lithium nickel cobalt manganese ternary cathode material (i.e. modified lithium nickel cobalt manganese ternary cathode material), in which the amorphous Li 0.05 La 0.65 TiO 3 The weight accounts for the total weight of the modified lithium-nickel-cobalt-manganese ternary cathode material (that is, th...

Embodiment 2

[0036] Add 0.048g of lithium nitrate and 0.299g of lanthanum nitrate hexahydrate into 253ml of absolute ethanol, stir until lanthanum nitrate hexahydrate and lithium nitrate are fully dissolved in absolute ethanol; continue to add 0.393g of isopropyl titanate, stir for 3h, and form Milky white liquid, LiNi 0.5 co 0.2 mn 0.3 o 2 Add the ternary positive electrode material into the milky white liquid, continue stirring for 4 hours to obtain a mixed solution; filter the mixed solution with suction, dry the obtained filter cake in an oven, heat to 600°C in an oxygen-containing atmosphere, and keep warm at 600°C for 4 hours, that is Amorphous Li 0.5 La 0.5 TiO 3 Coated lithium nickel cobalt manganese ternary cathode material (i.e. modified lithium nickel cobalt manganese ternary cathode material), in which the amorphous Li 0.5 La 0.5 TiO 3 The weight accounts for the total weight of the modified lithium-nickel-cobalt-manganese ternary cathode material (amorphous Li 0.5 La ...

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Abstract

The invention provides a modified lithium nickel-cobalt-manganese ternary positive electrode material and a preparation method thereof. The modified lithium nickel-cobalt-manganese ternary positive electrode material comprises a lithium nickel-cobalt-manganese ternary positive electrode material on the inner layer, and amorphous-state LixMyNO3 compound coating the surface of the lithium nickel-cobalt-manganese ternary positive electrode material, wherein 0<x<=y<0.67, M is selected from at least one of the La and Nb, N is selected from at least one of Ti and Zr. The preparation method comprises the following steps: adding lithium salt and M salt into an organic solvent, and continually stirring until the lithium salt and the M salt are fully dissolved into the organic solvent, so as to obtain a uniform solution; adding the N salt into the uniform solution, stirring continually, adding the lithium nickel-cobalt-manganese ternary positive electrode material, and then stirring continually, so as to obtain a mixed solution; and drying the obtained mixed solution to obtain powder, then heating in an oxygen atmosphere and preserving the temperature for a while, and cooling, thus obtaining the modified lithium nickel-cobalt-manganese ternary positive electrode material. According to the modified lithium nickel-cobalt-manganese ternary positive electrode material and the preparation method thereof provided by the invention, the circle performance, high temperature storage performance and safety performance of a lithium ion battery under high voltage are improved effectively.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a modified lithium-nickel-cobalt-manganese ternary positive electrode material and a preparation method thereof. Background technique [0002] Lithium-nickel-cobalt-manganese ternary cathode materials have attracted extensive attention from researchers due to their advantages such as high discharge specific capacity, good safety, and low price. However, compared with the lithium cobaltate cathode material, the lithium nickel cobalt manganese ternary cathode material has a higher content of nickel atoms and occupies the position of lithium atoms, resulting in more free lithium impurities on the surface. Under high temperature conditions, Lithium impurities and the electrolyte are prone to react to generate gas, which will lead to flatulence and deformation of lithium-ion batteries, which poses a great safety hazard. At the same time, due to the existence of high-pri...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122H01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 郑春凤阮丁山夏恒涛谭欣欣柳娜
Owner DONGGUAN AMPEREX TECH
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