Micro lithium-rich high-energy-density lithium cobalt oxide positive pole material and preparation method thereof

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

Active Publication Date: 2018-10-19
GEM JIANGSU COBALT IND CO LTD
View PDF4 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Micro lithium-rich high-energy-density lithium cobalt oxide positive pole material and preparation method thereof
  • Micro lithium-rich high-energy-density lithium cobalt oxide positive pole material and preparation method thereof
  • Micro lithium-rich high-energy-density lithium cobalt oxide positive pole material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

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, ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention belongs to the technical field of lithium battery positive pole materials and discloses a micro lithium-rich high-energy-density lithium cobalt oxide positive pole material and a preparation method thereof. Al and Ni are doped in a cobalt source preparation process, a lithium source is secondarily coated after a primary positive pole material is obtained, and the final micro lithium-rich high-energy-density lithium cobalt oxide positive pole material is obtained; by means of doping the defined amount of Al, a crystal structure is stabilized, circular plunge caused by structure collapse under the high voltage situation is prevented, charging cut-off voltage is improved to 4.5V, and discharging energy density is also improved; by means of introducing the Ni element, material impedance can be appropriately improved; the Ni element and the lithium source are mixed to generate a little of Li / Ni mixture, and specific discharge capacity is improved to a certain extent; in addition, the lithium titanate is secondarily coated, so that the lithium titanate and a matrix can synchronously perform lithium disembedding, and lithium ions to a negative pole are increased; thus, higher energy density is achieved, and high voltage, excellent circulation and high energy density are wholly achieved.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap