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Lithium nickel and cobalt aluminate anode material and preparation method and lithium ion battery thereof

A technology of lithium nickel cobalt aluminate and cathode material, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem that the cycle performance of cathode materials needs to be improved.

Inactive Publication Date: 2017-03-22
NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cycle performance of cathode materials still needs to be improved.

Method used

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  • Lithium nickel and cobalt aluminate anode material and preparation method and lithium ion battery thereof
  • Lithium nickel and cobalt aluminate anode material and preparation method and lithium ion battery thereof
  • Lithium nickel and cobalt aluminate anode material and preparation method and lithium ion battery thereof

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preparation example Construction

[0043] The present invention also provides a method for preparing the above nickel-cobalt-lithium-aluminate cathode material, comprising the following steps:

[0044] S1) Mix nickel salt, cobalt salt, aluminum salt, the first complexing agent and the first precipitant, heat for precipitation reaction, and obtain a suspension of nickel cobalt aluminum hydroxide; mix the manganese salt, the second complexing agent, the first The second precipitating agent is mixed with the nickel-cobalt-aluminum hydroxide suspension, and after the heating reaction, the first intermediate product is obtained; the mol ratio of the nickel ion in the nickel salt, the cobalt ion in the cobalt salt and the aluminum ion in the aluminum salt is (1- x-y): x:y; 0.00<x≤0.30, 0.00<y≤0.10;

[0045] S2) heat-treating the first intermediate product to obtain a second intermediate product;

[0046] S3) mixing and sintering the second intermediate product and lithium compound to obtain a third intermediate prod...

Embodiment 1

[0064]1.1 Preparation of nickel-cobalt-aluminum hydroxide: dissolving nickel sulfate and cobalt sulfate with deionized water to form the first mixed solution with a metal ion concentration of 1.5 mol / L, and the Ni:Co atoms in the first mixed solution The ratio is 0.90:0.10; the aluminum sulfate solution and glycine are made into the second mixed solution with an aluminum ion concentration of 0.5mol / L in a molar ratio of 1:3; the manganese sulfate solution and glycine are made in a molar ratio of 1:3 Manganese ion concentration is the 3rd mixed solution of 0.05mol / L; The sodium hydroxide solution of the ammoniacal liquor of described first mixed solution, the second mixed solution, 10mol / L and 5mol / L is added in the reactor by peristaltic pump, Continuous co-precipitation reaction was carried out at 50°C and a stirring speed of 300 rpm, and the ammonia value during the precipitation process was controlled to be 18g / L, and the pH value was 12. After fully reacting for 10 hours, n...

Embodiment 2

[0073] 2.1 Preparation of nickel-cobalt-aluminum hydroxide: the nickel sulfate solution, cobalt sulfate solution, and aluminum sulfate solution with an atomic ratio of Ni:Co:Al of 0.85:0.12:0.03 are uniformly mixed in deionized water, and the metal in the mixed solution is The ion concentration is 2mol / L; then, 8mol / L ammonia water, 5mol / L sodium hydroxide solution and the above-mentioned mixed metal solution flow into the reactor with a peristaltic pump. Continuous co-precipitation reaction was carried out at 45°C and a stirring speed of 320 rpm. The ammonia value during the precipitation process was controlled to be 15g / L and the pH value was 11.8. After the reaction was complete for 12 hours, nickel-cobalt lithium aluminate was obtained. Hydroxide suspension; mix manganese sulfate solution and glycine at a molar ratio of 1:3 to form a solution with a manganese ion concentration of 0.06mol / L and add it to the nickel-cobalt lithium aluminate hydroxide suspension with a perista...

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Abstract

The invention provides a preparation method of a lithium nickel and cobalt aluminate anode material. The preparation method comprises the following steps that nickel salt, cobalt salt, aluminum salt, a first complexing agent and a first precipitant are mixed and are heated, precipitation reaction is performed to obtain aluminum nickel and cobalt hydroxide suspension liquid, the suspension liquid is mixed with manganese salt, a second complexing agent and a second precipitant, a first intermediate product is obtained after heating reaction, thermal treatment is performed to obtain a second intermediate product, the second intermediate product is mixed and sintered with a lithium compound to obtain a third intermediate product, the third intermediate product is mixed with a coating agent, and thermal treatment is performed to obtain the lithium nickel and cobalt aluminate anode material. Compared with the prior art, manganese hydroxide coating is conducted on the surface of aluminum nickel and cobalt hydroxide, and direct contact between surface nickel ions and air is effectively avoided in follow-up treatment, so that the alkali compound content of the lithium nickel and cobalt aluminate anode material is remarkably reduced. In addition, the material can react with residual lithium on the surface of a sintering product through the follow-up coated coating agent, and the alkalinity and moisture of the lithium nickel and cobalt aluminate anode material are reduced.

Description

technical field [0001] The invention relates to the technical field of cathode materials, in particular to a nickel-cobalt-lithium-aluminate cathode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] At present, lithium-ion batteries have been widely used in various portable electronic products, power tools and energy storage systems. As global energy and environmental problems become more and more serious, lithium-ion batteries are gradually moving from mobile phones, notebook computers, digital cameras and portable small appliances to the field of electric vehicle power. Therefore, the cycle performance, energy density and safety of lithium-ion batteries Performance also puts forward higher requirements. The ternary material (NCM) synthesized LiCoO 2 , LiNiO 2 and LiMnO 2 The advantages of the three materials, due to the obvious synergistic effect among Ni, Co, and Mn, NMC has better performance than single-component layere...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M10/0525
CPCH01M4/525H01M10/0525Y02E60/10
Inventor 黄洁文袁徐俊梅文捷于建陈涨宗王碧军刘志远佘圣贤黄连友
Owner NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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