Preparation method of double-layer surface-coated high-nickel ternary single-crystal positive electrode material
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A positive electrode material and surface coating technology, which is applied in the field of preparation of double-layer surface-coated high-nickel ternary single-crystal positive electrode materials, and can solve problems such as the negative effect of high-nickel ternary materials
Inactive Publication Date: 2021-05-18
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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The preparation temperature of the LATP solid electrolyte in patent CN108565413A is 700-
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Embodiment 1
[0029] A kind of Li 1.4 Al 0.4 Ti 1.6 (PO 4 ) 3 The preparation method of / KH560 composite coated high-nickel ternary 811 single crystal positive electrode material specifically includes the following steps:
[0030] (1), weigh 3.66gLi 2 CO 3 , 2.04g of aluminum hydroxide and 26.32g of ammonium dihydrogen phosphate were added to 5000g of NCM811 single crystal positive electrode material, mixed for 1 hour using a ball mill jar and a polyurethane ball mill, the ball milling speed was 120r / min, and mixture A was obtained after ball milling;
[0031] (2) Weighing 36.00 g of tetrabutyl titanate and adding it to mixture A, maintaining the ball milling conditions in step (1) (ball milling and mixing for 1 h, ball milling speed of 120 r / min) for ball milling and mixing, and mixture B was obtained after ball milling and mixing;
[0032] (3), the mixture B in O 2 Under the atmosphere, the Li 1.4 Al 0.4 Ti 1.6 (PO 4 ) 3 Coated high-nickel ternary 811 single crystal cathode ma...
Embodiment 2
[0038] A kind of Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 The preparation method of / KH570 composite coated high-nickel ternary 712 single crystal positive electrode material specifically includes the following steps:
[0039] (1) Weigh 3.40gLi 2 CO 3 , 1.53g of aluminum hydroxide and 26.32g of ammonium dihydrogen phosphate were added to 5000g of NCM712 single crystal positive electrode material, mixed for 1 hour using a ball mill jar and a polyurethane ball mill, the ball milling speed was 120r / min, and mixture A was obtained after ball milling;
[0040] (2) Weigh 38.25 g of tetrabutyl titanate and add it to the mixture A, keep the ball milling conditions in step (1) (ball milling and mixing for 1 hour, and the ball milling speed is 120 r / min) for ball milling and mixing, and the mixture B is obtained after ball milling and mixing;
[0041] (3), the mixture B in O 2 Under the atmosphere, the Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 Coated high-nickel ternary 712 single crystal cathod...
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Abstract
The invention discloses a preparation method of a double-layer surface-coated high-nickel ternary single-crystal positive electrode material. The method comprises the following steps: sequentially and sufficiently mixing a lithium source, an aluminum source, a phosphorus source, a titanium source or a germanium source with a high-nickel ternary single-crystal positive electrode material step by step under a solvent-free condition, wherein the lithium source, the aluminum source, the phosphorus source, the titanium source or the germanium source have mutual reactivity; and sintering at low temperature to obtain a high-nickel ternary single crystal material coated with an LISICON type solid electrolyte and with stability and ionic conductivity, and treating the high-nickel ternary single crystal material with a silane coupling agent to form a hydrophobic layer on the surface of the high-nickel ternary single crystal material. The sintering temperature of the LISICON type solid electrolyte can be greatly reduced by utilizing the chemical reaction activity among the raw materials, and the process and environment problems caused by organic solvent coating are effectively improved; and the double-layer coating structure can effectively improve the circulation and rate performance of the high-nickel ternary single-crystal positive electrode material, and reduce the requirement of the high-nickel ternary single-crystal positive electrode material on environment humidity.
Description
technical field [0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a method for preparing a double-layer surface-coated high-nickel ternary single crystal positive electrode material. Background technique [0002] Compared with fuel vehicles, energy density is the disadvantage of electric vehicles, and the high-nickel ternary single crystal cathode material LiNi 1-x- y co x mn y o 2 (1 / 20≤x≤1 / 3, 1 / 20≤y≤1 / 3) has higher tap density, better high temperature performance and cycle performance than high nickel ternary polycrystalline cathode materials, and is more suitable for high Voltage products, with their excellent performance, will gradually become the leading cathode material for power batteries in the future market. [0003] Although high-nickel ternary single crystal cathode materials have excellent performance in all aspects, like polycrystalline cathode materials, with the increase of nick...
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