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Nickle-cobalt-aluminium anode material with long cycle life and high specific capacity and preparation method thereof

A high specific capacity, cathode material technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve problems such as poor cycle life, and achieve the effect of improving processing performance, excellent performance, and improving cycle performance

Inactive Publication Date: 2018-11-27
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a nickel-cobalt-aluminum positive electrode material with a long cycle life and high specific capacity and its preparation method, which solves the problem of poor cycle life of NCA materials used in lithium batteries while maintaining a high specific capacity

Method used

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  • Nickle-cobalt-aluminium anode material with long cycle life and high specific capacity and preparation method thereof
  • Nickle-cobalt-aluminium anode material with long cycle life and high specific capacity and preparation method thereof
  • Nickle-cobalt-aluminium anode material with long cycle life and high specific capacity and preparation method thereof

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Embodiment 1

[0035] Provide a long cycle life high specific capacity nickel-cobalt-aluminum positive electrode material and its preparation method, its chemical formula is Li 1.05 Ni 1-x- y co x al y Mg z O·wAl 2 o 3 , where x, y, z, and w are the number of moles, 0≤x≤0.2, 0≤y≤0.1, 0≤x+y≤0.2, 02 o 3 It is the coating layer oxide of nickel-cobalt-aluminum ternary cathode material with long cycle life and high specific capacity.

[0036] The nickel-cobalt-aluminum positive electrode material with long cycle life and high specific capacity is prepared through the following steps:

[0037] (1) In terms of molar ratio, nickel sulfate, cobalt sulfate and aluminum sulfate metal salts were dissolved in deionized water, mixed according to the ratio of Ni:Co:Al=(1-x-y):x:y, and continuously pumped by a peristaltic pump Pump the metal salt solution into the reaction kettle, use NaOH as the precipitating agent, and ammonia water as the complexing agent, adjust the injection speed of the precip...

Embodiment 2

[0041] A method for preparing a nickel-cobalt-aluminum cathode material with a long cycle life and high specific capacity is provided, which is prepared by the following steps:

[0042] (1) In terms of molar ratio, nickel sulfate, cobalt sulfate and aluminum sulfate metal salts were dissolved in deionized water, mixed according to the ratio of Ni:Co:Al=(1-x-y):x:y, and continuously pumped by a peristaltic pump Pump the metal salt solution into the reaction kettle, use NaOH as the precipitating agent, and ammonia water as the complexing agent, adjust the injection speed of the precipitating agent and ammonia water to control the pH value of the reaction kettle to be 9 to 12, and carry out the co-precipitation reaction. (Ni 1-x-y co x al y )OH 2 After suction filtration, washing and drying, the precursor is obtained;

[0043] (2) LiOH·H 2 O, precursor and Mg source according to the molar ratio Li:(Ni 1-x-y co x al y )OH 2 : Mg source = 1.05: 1: z ball milling mixing, mi...

Embodiment 3

[0048] In conjunction with specific examples, a method for preparing a long cycle life and high specific capacity nickel-cobalt-aluminum positive electrode material of the present invention is illustrated, which is prepared by the following steps:

[0049] (1) In terms of molar ratio, dissolve nickel sulfate, cobalt sulfate and aluminum sulfate metal salt in deionized water, mix according to the ratio of Ni:Co:Al=0.8:0.15:0.05, and use a peristaltic pump to continuously pump the metal salt solution into the reactor, use NaOH as the precipitating agent, and ammonia as the complexing agent, adjust the injection speed of the precipitating agent and ammonia to control the pH value of the reactor to be 11, carry out the co-precipitation reaction, and the (Ni 0.8 co 0.15 al 0.05 )OH 2 After suction filtration, washing and drying, the precursor is obtained, and the morphology is spherical, with a particle size of 5-8 μm detected by SEM;

[0050] (2) Weigh 0.105mol LiOH·H 2 O, 0.1...

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Abstract

The invention discloses a nickle-cobalt-aluminium anode material used for a lithium ion battery with a long cycle life and a high specific capacity and a preparation method thereof. The chemical formula of the anode material is Li1.05Ni1-x-yyCoxAlyMgzO2.wAl2O3, where x, y, z, w are mole numbers, x is more than or equal to 0 and less than or equal to 0.2, y is more than or equal to 0 and less thanor equal to 0.1, x+y is more than or equal to 0 and less than or equal to 0.2, z is more than 0 and less than or equal to 0.02, w is more than 0 and less than or equal to 0.02, Mg is a doped element,and Al2O3 is a cladding layer oxide of the nickle-cobalt-aluminium anode material with long cycle life and high specific capacity. According to the invention, on the premise of keep a relatively highspecific discharge capacity, the cycle performance of the lithium ion battery nickle-cobalt-aluminium anode material can be greatly improved, and excellent electrochemical performance can be presented. Cheap metal materials such as Mg and Al are introduced in the preparation process of the nickle-cobalt-aluminium anode material, the cost is low, the preparation process is simple, and the problem of short cycle life of the nickle-cobalt-aluminium anode material can be improved to a great extent.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery cathode materials, in particular to a nickel-cobalt-aluminum cathode material for lithium-ion batteries with long cycle life and high specific capacity and a preparation method thereof. Background technique [0002] Lithium-ion batteries have many advantages such as high energy density, high working voltage, long cycle life, and no memory function, and are considered to be the most ideal power source for new energy vehicles. However, the energy density of existing lithium-ion batteries is not high, which limits the cruising range of new energy vehicles, thus seriously restricting the rapid development and comprehensive popularization of electric vehicles. [0003] The energy density of lithium-ion batteries depends on the performance of the positive and negative electrode materials, and the traditional positive electrode materials such as Li 2 MnO 4 , LiFePO 4 、LiNi 1 / 3 co 1 / 3 mn ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M10/0525
CPCH01M4/366H01M4/485H01M4/525H01M10/0525Y02E60/10
Inventor 武建飞牛全海刘涛
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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