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Low-surface-alkalinity lithium nickel cobalt aluminate positive electrode material and preparation method thereof

A technology of nickel cobalt lithium aluminate and cathode material, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve problems such as harsh reaction conditions, achieve easy reaction, improve solid-phase reaction rate, improve reaction activity and Effect of Solid Phase Reaction Rate

Inactive Publication Date: 2018-08-17
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to solve the problem that the surface modification of the existing nickel-cobalt-lithium-aluminate positive-electrode material adopts a dry method to coat the problem of harsh reaction conditions. The present invention provides a low-surface alkaline nickel-cobalt-lithium-aluminate positive-electrode material and its preparation method

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  • Low-surface-alkalinity lithium nickel cobalt aluminate positive electrode material and preparation method thereof

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Embodiment 1

[0028] A kind of preparation method of nickel-cobalt lithium aluminate cathode material with low surface alkalinity: Ni x co y al z (OH) 2 The ternary precursor and LiOH were weighed at a molar ratio of 1:1.05, and after being fully mixed, the mixed powder was transferred to a corundum boat and pushed to the center of the tube furnace for calcination, while oxygen was introduced at a heating rate of 5°C / Min, first heat-preserve and react at 480°C for 4 hours, then heat up to 750°C and sinter for 15 hours to obtain the positive electrode active material of nickel cobalt lithium aluminate; add the obtained positive electrode active material of nickel cobalt lithium aluminate and magnesium hydrogen phosphate at a ratio of 98.5:1.5 In the ball mill tank, set the ball mill speed to 230r / min. After ball milling for 2 hours, heat it to 550°C in an oxygen stream and keep it warm for 5 hours to obtain a low surface alkaline nickel-cobalt-lithium-aluminate positive electrode material...

Embodiment 2

[0030] A kind of preparation method of nickel-cobalt lithium aluminate cathode material with low surface alkalinity: Ni x co y al z (OH) 2 The ternary precursor and LiOH were weighed at a molar ratio of 1:1.05, and after being fully mixed, the mixed powder was transferred to a corundum boat and pushed to the center of the tube furnace for calcination, while oxygen was introduced at a heating rate of 5°C / Min, first heat preservation reaction at 480°C for 5 hours, then heat up to 750°C and sinter for 13 hours to obtain the positive electrode active material of nickel cobalt lithium aluminate; add the obtained positive electrode active material of nickel cobalt lithium aluminate and zirconium hydrogen phosphate at a ratio of 99:1 In the ball mill tank, set the ball mill speed to 200r / min. After ball milling for 3 hours, heat it to 450°C in an oxygen flow and keep it warm for 5 hours to obtain a low surface alkaline nickel-cobalt lithium aluminate cathode material. The pH was m...

Embodiment 3

[0032] A kind of preparation method of nickel-cobalt lithium aluminate cathode material with low surface alkalinity: Ni x co y al z (OH) 2 The ternary precursor and LiOH were weighed at a molar ratio of 1:1.05, and after being fully mixed, the mixed powder was transferred to a corundum boat and pushed to the center of the tube furnace for calcination, while oxygen was introduced at a heating rate of 5°C / Min, first heat-preserve and react at 500°C for 4 hours, then heat up to 750°C and sinter for 14 hours to obtain the positive electrode active material of nickel cobalt lithium aluminate; Add 99:0.5:0.5 into the ball milling tank, set the ball milling speed to 250r / min, after ball milling for 3 hours, heat to 600°C in the oxygen flow, and keep it warm for 5 hours to obtain a low surface alkaline nickel cobalt lithium aluminate cathode material, The pH value measured by the pH test is 11.81, and the first-cycle discharge specific capacity is 187.8mAh g by the electrochemical...

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Abstract

The invention discloses a low-surface-alkalinity lithium nickel cobalt aluminate positive electrode material and a preparation method thereof. The lithium nickel cobalt aluminate positive electrode material is obtained by performing calcining on metal hydrogen phosphate and a lithium nickel cobalt aluminate positive electrode active material in oxygen flow. By adoption of metal hydrogen phosphatewhich is decomposed into pyrophosphate in calcining, reactant activity is improved, and a reaction with the residual alkali in the lithium nickel cobalt aluminate positive electrode active material ispromoted to generate a Li<3>PO<4> coating layer; compared with phosphate, hydrogen phosphate is lower in structural firmness, lower in lattice energy and easier in reaction, so that the calcining temperature can be obviously lowered; dry method coating of the lithium nickel cobalt aluminate positive electrode active material is converted from high temperature solid phase reaction (700 DEG C) in the prior art into a medium temperature solid phase reaction (400-600 DEG C), so that reaction difficulty is greatly lowered; and in addition, simple process, low cost and high production efficiency are achieved, so that realization of large-scale industrial production can be facilitated.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and in particular relates to a low surface alkaline nickel-cobalt lithium aluminate positive electrode material and a preparation method thereof. Background technique [0002] High-nickel-based ternary cathode materials such as nickel-cobalt lithium aluminate cathode materials have the advantages of high energy density, low cost, and environmental friendliness, so they have attracted widespread attention and are considered to be very promising in lithium-ion batteries for electric vehicles. Cathode material in the foreground. However, as a high-nickel nickel-cobalt lithium aluminate (NCA) ternary cathode material, it still has a serious problem, that is, the surface of the material is easy to react with moisture and carbon dioxide in the air to form LiOH and Li 2 CO 3 and other by-products, which deteriorate the surface structure of the material, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 瞿美臻陈滔闫新秀汪沣李想王昊
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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