A kind of slightly lithium-rich high energy density lithium cobalt oxide positive electrode material and preparation method thereof

A density lithium cobalt oxide, cathode material technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of unstable crystal structure, inability to ensure high discharge specific capacity, etc., to improve cycle performance, high energy density, The effect of improving material resistance

Active Publication Date: 2021-04-06
GEM JIANGSU COBALT IND CO LTD
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Problems solved by technology

[0003] In view of the above problems, the object of the present invention is to provide a slightly lithium-rich high energy density lithium cobalt oxide positive electrode material and its preparation method, aiming to solve the problem that the existing lithium cobalt oxide positive electrode materials cannot guarantee high discharge ratio while ensuring cycle performance Capacity and technical problems with unstable crystal structure

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  • A kind of slightly lithium-rich high energy density lithium cobalt oxide positive electrode material and preparation method thereof
  • A kind of slightly lithium-rich high energy density lithium cobalt oxide positive electrode material and preparation method thereof
  • A kind of slightly lithium-rich high energy density lithium cobalt oxide positive electrode material and preparation method thereof

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preparation example Construction

[0020] A method for preparing a slightly lithium-rich high energy density lithium cobalt oxide positive electrode material provided by the present invention comprises the following steps:

[0021] Step 1, weighing cobalt salt, aluminum salt and nickel salt according to a certain metal molar ratio, dissolving them in deionized water, and preparing salt solution A;

[0022] Specifically, the cobalt salt, aluminum salt and nickel salt are respectively CoSO 4 、Al 2 (SO 4 ) 3 、NiSO 4 , CoSO 4 、Al 2 (SO 4 ) 3 、NiSO 4 Weigh according to the molar ratio of metal Co:Al:Ni (80-96):(2-10):(2-10), and the metal ion concentration in salt solution A is 1mol / L.

[0023] Step 2, preparing NaOH solution and ammonia solution;

[0024] Specifically, the concentration of the NaOH solution is 2 mol / L, and the concentration of the ammonia solution is 1 mol / L.

[0025] Step 3, adding a certain amount of deionized water and ammonia water in the reactor as the reaction bottom liquid in the ...

Embodiment 1

[0041] 1) CoSO 4、Al 2 (SO 4 ) 3 、NiSO 4 Weigh according to the ratio of Co:Al:Ni 92:3:5, dissolve in deionized water, and make salt solution A with a metal ion concentration of 1mol / L 1 ; Configure the NaOH alkali solution with a concentration of 2mol / L and the ammonia solution with a concentration of 1mol / L. Add a certain amount of deionized water and ammonia water into the reaction kettle, and configure a 0.5mol / L ammonia solution as the reaction bottom liquid. Then the saline solution A 1 , NaOH solution and ammonia solution are added to the reaction kettle at a certain flow rate at the same time to form a mixture, and a part of the mixture is taken for co-precipitation reaction for 12 hours to obtain a mixed solution of precipitated particles with a suitable particle size, and the mixed solution of precipitated particles is aged for 12 hours, washed The sediment was washed several times until the washing solution was neutral, then filtered, dried in an oven at 120°C,...

Embodiment 2

[0045] 1) CoSO 4 、Al 2 (SO 4 ) 3 、NiSO 4 Weigh according to the ratio of Co:Al:Ni 92:2:6, dissolve in deionized water, and make salt solution A with metal ion concentration of 1mol / L 1 ; Configure the NaOH alkali solution with a concentration of 2mol / L and the ammonia solution with a concentration of 1mol / L. Add a certain amount of deionized water and ammonia water into the reaction kettle, and configure a 0.5mol / L ammonia solution as the reaction bottom liquid. Then the saline solution A 1 , NaOH solution and ammonia solution are added to the reaction kettle at a certain flow rate at the same time to form a mixture, and a part of the mixture is taken for co-precipitation reaction for 12 hours to obtain a mixed solution of precipitated particles with a suitable particle size, and the mixed solution of precipitated particles is aged for 12 hours, washed The sediment was washed several times until the washing solution was neutral, then filtered, dried in an oven at 120°C, ...

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Abstract

The invention is applicable to the technical field of lithium battery positive electrode materials, and provides a slightly lithium-rich high energy density lithium cobaltate positive electrode material and a preparation method thereof, in which Al and Ni are doped in the process of preparing cobalt sources, and after obtaining preliminary positive electrode materials The secondary coating of the lithium source is carried out to obtain the final micro-lithium-rich high-energy-density lithium cobalt oxide positive electrode material. The crystal structure is stabilized by doping an appropriate amount of Al to prevent cyclic diving caused by the collapse of the structure under high voltage conditions, and the charge is cut off. The voltage is increased to 4.5V, and the discharge energy density can also be increased. The introduction of Ni element can properly improve the material impedance and mix with the lithium source to produce a small amount of Li / Ni mixed discharge, which improves the discharge specific capacity to a certain extent; in addition, the secondary coating The layered lithium titanate can simultaneously deintercalate lithium with the substrate, increasing the lithium ions reaching the negative electrode, resulting in higher energy density, and achieving high voltage, good cycle, and high energy density as a whole.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium batteries, and in particular relates to a slightly lithium-rich high energy density lithium cobaltate positive electrode material and a preparation method thereof. Background technique [0002] The main direction of development of lithium cobalt oxide is high voltage and high compaction density. The purpose is to increase the volumetric energy density of the battery to meet the requirements of use. The technical means are mainly bulk phase doping and surface coating, but with the increase of doping Although the cycle has been improved, the discharge specific capacity has dropped significantly, which cannot meet the increasingly higher requirements of the market and customers for energy density. Because the doping amount is limited, with the increase of the charge cut-off voltage, more lithium ions go back and forth De-intercalation / embedding, the instability of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525
CPCH01M4/525Y02E60/10
Inventor 许开华栗志涛徐世国宋健巍靳亚珲丁文秀
Owner GEM JIANGSU COBALT IND CO LTD
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