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Preparation method of a high-nickel ternary material and its application in solid-state lithium-ion battery positive plates

A high-nickel ternary material, lithium-ion battery technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve high-nickel ternary material capacity, cycle and rate performance deterioration, affect ternary material capacity and cycle Performance, high residual lithium and residual alkali content, etc., to achieve the effect of improving electrochemical performance, uniform size, and low residual alkali content on the surface

Active Publication Date: 2022-05-13
WANXIANG 123 CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the high sintering temperature that will cause the deterioration of the capacity, cycle and rate performance of the high-nickel ternary material when the high-temperature sintering method is used to prepare the ternary material in the prior art; while reducing the sintering temperature will cause residual lithium on the surface of the material High nickel and residual alkali content will also affect the capacity and cycle performance of ternary materials. A preparation method of high-nickel ternary materials and its application in solid-state lithium-ion battery positive plates are provided. The hydrothermal-low temperature The sintering method replaces high-temperature sintering to prepare a high-nickel ternary cathode material with complete shape, uniform size, low surface residual alkali, and excellent electrochemical performance, and can obtain high-nickel ternary materials with excellent performance at lower energy consumption

Method used

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  • Preparation method of a high-nickel ternary material and its application in solid-state lithium-ion battery positive plates

Examples

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Comparison scheme
Effect test

Embodiment 1

[0039] A solid-state lithium-ion battery positive plate, the preparation method of which is:

[0040] (1) PEO and LiClO with a mass ratio of 1:8 4 Dissolve in a mixed solvent of water and ethanol with a volume ratio of 1:1, stir at 50°C for 4 hours to obtain a mixed solution;

[0041] (2) The mixed solution is evenly coated on the surface of the LATP solid electrolyte layer, and after drying, a PEO coating layer with a thickness of 12 μm is obtained on the LATP solid electrolyte layer;

[0042] Wherein, the preparation method of LATP solid electrolyte layer is:

[0043] a) LiNO 3 , Al(NO 3 ) 3 9H 2 O, NH 4 h 2 PO 4 and CsClO 4 Add deionized water to dissolve, then add citric acid, stir well, then add titanium lactate, stir at 75°C for 18 hours to obtain a viscous liquid; among them, LiNO 3 , Al(NO 3 ) 3 9H 2 O, titanium lactate and NH 4 h 2 PO 4 The amount of addition is 1.3:0.3:1.7:3 according to the molar ratio of Li, Al, Ti, P, CsClO 4 The added amount of c...

Embodiment 2

[0054] A solid-state lithium-ion battery positive plate, the preparation method of which is:

[0055] (1) PEO and LiClO with a mass ratio of 1:7 4 Dissolve in a mixed solvent of water and ethanol with a volume ratio of 1:1, and stir at 45°C for 5 hours to obtain a mixed solution;

[0056] (2) The mixed solution is evenly coated on the surface of the LATP solid electrolyte layer, and after drying, a PEO coating layer with a thickness of 10 μm is obtained on the LATP solid electrolyte layer;

[0057] Wherein, the preparation method of LATP solid electrolyte layer is:

[0058] a) LiNO 3 , Al(NO 3 ) 3 9H 2 O, NH 4 h 2 PO 4 and CsClO 4 Add deionized water to dissolve, then add citric acid, stir well, then add titanium lactate, stir at 70°C for 20 hours to obtain a viscous liquid; among them, LiNO 3 , Al(NO 3 ) 3 9H 2 O, titanium lactate and NH 4 h 2 PO 4 The amount of addition is 1.4:0.4:1.6:3 according to the molar ratio of Li, Al, Ti, P, CsClO 4 The added amount ...

Embodiment 3

[0069] A solid-state lithium-ion battery positive plate, the preparation method of which is:

[0070] (1) PEO and LiClO with a mass ratio of 1:10 4 Dissolve in a mixed solvent of water and ethanol with a volume ratio of 1:1, stir at 55°C for 3 hours to obtain a mixed solution;

[0071] (2) The mixed solution is evenly coated on the surface of the LATP solid electrolyte layer, and after drying, a PEO coating layer with a thickness of 15 μm is obtained on the LATP solid electrolyte layer;

[0072] Wherein, the preparation method of LATP solid electrolyte layer is:

[0073] a) LiNO 3 , Al(NO 3 ) 3 9H 2 O, NH 4 h 2 PO 4 and CsClO 4 Add deionized water to dissolve, then add citric acid, stir well, then add titanium lactate, stir at 80°C for 10 hours to obtain a viscous liquid; among them, LiNO 3 , Al(NO 3 ) 3 9H 2 O, titanium lactate and NH 4 h 2 PO 4 The amount of addition is 1.2:0.2:1.8:3 according to the molar ratio of Li, Al, Ti, P, CsClO 4 The added amount of ...

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Abstract

The invention discloses a preparation method of a high-nickel ternary material and its application in a positive electrode sheet of a solid-state lithium ion battery. The (Ni a co b mn c )(OH) 2 After the precursor, the precursor is subjected to a hydrothermal reaction with LiOH, and then sintered at a low temperature to prepare a high-nickel ternary material with complete morphology and uniform size. The present invention adopts the hydrothermal-low temperature sintering method instead of high temperature sintering, which can greatly reduce the sintering temperature, avoid Li and Ni evaporation during sintering, and Li + and Ni 2+ The formation of mixed cations can increase the Li + The mobility in the Li layer improves the capacity, cycle and rate performance of high-nickel ternary materials; and, the high-nickel ternary materials prepared by hydrothermal-low temperature sintering method have low residual alkali on the surface, which will not affect the cycle performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a preparation method of a high-nickel ternary material and its application in a positive electrode sheet of a solid-state lithium-ion battery. Background technique [0002] With the development of new energy vehicles, lithium-ion power batteries have attracted much attention as the most popular electric vehicle power batteries. Compared with the mature and stable graphite anode, the research and development of cathode materials with high capacity, long life, low cost, safety and environmental protection is particularly urgent. The currently commonly used cathode materials for lithium batteries mainly include layered lithium cobaltate, ternary materials, spinel-structured lithium manganate and olivine-structured lithium iron phosphate. Ternary materials have high specific capacity, energy density and power density, and relatively stable performance, so they have bec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525H01M4/505H01M4/1391H01M10/0525H01M10/42
CPCH01M4/525H01M4/505H01M4/1391H01M10/0525H01M10/4235H01M2004/028Y02E60/10
Inventor 肖彪彪
Owner WANXIANG 123 CO LTD
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