Surface coated lithium ion battery cathode material and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of uneven distribution of coatings, complicated control, and difficult realization, and achieve good uniformity, good repeatability, Mature and reliable equipment

Active Publication Date: 2012-07-18
HUBEI RONGBAI LITHIUM BATTERY MATERIAL CO LTD
View PDF6 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the difficulty of this method is that during the hydrolysis process of the metal salt, the nucleation and growth of the insoluble matter does not necessarily take place on the surface of the particles, but a considerable part still occurs in the solution, and separate particles are precipitated, resulting in coatings. Uneven distribution can only be improved by precisely controlling the reaction conditions, which is difficult to realize and complicated to control

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

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0030] The positive electrode active material is lithium nickel cobaltate, the agent of type A is a saturated solution of lithium hydroxide, and the agent of type B is a saturated solution of aluminum nitrate.

[0031] Each mole of positive electrode active material is calculated on the basis of 0.2% atomic ratio, corresponding to 2 ml of type A agent and 5 ml of type B agent.

[0032] The amount of A-type agent and B-type agent needs to be calculated according to the type of coating and the amount of positive electrode material occupied by the coating. The coating of lithium nickel cobaltate accounts for 0.2% of the atom (the ratio of aluminum to transition metal nickel and cobalt ) alumina as an example, 1 mole of lithium nickel cobaltate (97.68g) needs to be coated with 0.001 mole of alumina, use 0.006 mole (0.25g) of lithium hydroxide (A agent), 0.002 mole (0.75g) Aluminum nitrate (category B agent).

[0033] In order to keep the solution in an adsorption state instead of...

no. 2 example

[0042] The positive electrode active material is lithium nickel cobaltate, the agent of type A is a saturated solution of lithium hydroxide, and the agent of type B is a saturated solution of magnesium nitrate.

[0043] Step 1. Put 1kg of the original sample of lithium nickel cobaltate into a 5L mixing and drying kettle, and start the machine for high-speed mixing. Put the saturated solution of lithium hydroxide into the sprayer and start the pressure spraying device to spray. Based on the coating amount of 0.3%, spray the corresponding amount of saturated solution, and mix for 2 hours after the spraying is completed.

[0044] Step 2. While continuing to mix, spray the saturated solution of magnesium nitrate. Based on the coating amount of 0.3%, spray the corresponding amount of saturated solution. The spray speed is subject to spraying within 2 hours, and then continue to mix for 0.5 hours after spraying .

[0045] Step 3. Continue mixing, and start the vacuum drying system,...

no. 3 example

[0049] The positive electrode active material is lithium nickel cobaltate, the A-type agent is a saturated solution of oxalic acid, and the B-type agent is a saturated titanate solution.

[0050] Step 1. Put 1kg of the original sample of lithium nickel cobaltate into a 5L mixing and drying kettle, and start the machine for high-speed mixing. Put the oxalic acid saturated solution into the sprayer and start the pressure spraying device to spray. Based on the coating amount of 0.3%, spray the corresponding amount of the oxalic acid saturated solution, and mix for 2 hours after the spraying is completed.

[0051] Step 2. While continuing to mix, spray the saturated titanate solution. Based on the coating amount of 0.3%, spray the corresponding amount of the saturated titanate solution. The spray speed is subject to spraying within 2 hours. Mixing was continued for 2 hours.

[0052] Step 3. Continue mixing, and start the vacuum drying system, keep the temperature between 60°C and...

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

PropertyMeasurementUnit
thicknessaaaaaaaaaa
specific surface areaaaaaaaaaaa
volumeaaaaaaaaaa
Login to view more

Abstract

The invention discloses a surface coated lithium ion battery cathode material. The surface coated lithium ion battery cathode material is formed by coating the surface of a cathode active material with a coating agent, wherein the cathode active material comprises one of lithium cobalt oxide, lithium manganate and nickel lithium cobalt oxide or a mixture of more than one of the lithium cobalt oxide, lithium manganate and nickel lithium cobalt oxide; the coating agent is prepared by reacting an agent A with an agent B; the agent A is a saturated solution of acid or a saturated solution of alkali or water; and the agent B is a saline solution which can be hydrolyzed to precipitate when meeting the agent A. The invention has the main characteristics that: the addition of the solution is controlled by utilizing the adsorption of the surface of the particles on the solution, and the adsorbed water on the surfaces of solid particles accounts for the vast majority of the solution in a uniformly mixed solid-liquid system; and moreover, proper conditions are provided to ensure that a hydrolysis reaction is carried out in adsorption layers on the surfaces of the particles, a coating generated in the adsorbed water layers uniformly covers the surfaces of the particles, and an effect of uniformly coating is achieved.

Description

technical field [0001] The invention relates to the field of preparation of lithium-ion battery cathode materials, in particular to a surface-coated lithium-ion battery cathode material and a preparation method thereof. Background technique [0002] Lithium-ion battery has many advantages such as long life, high voltage, high energy density, no memory effect, etc. It has become the first choice for the power supply of mobile digital products, and its application in electric vehicles, electric bicycles, and electric tools is also developing rapidly. The cathode material is the key factor affecting the performance of lithium-ion batteries. In the past ten years, the development of cathode materials has been rapid, from the early single lithium cobalt oxide to the current lithium cobalt oxide, nickel-cobalt-manganese multi-component cathode materials, lithium manganese oxide, and iron phosphate. Lithium and other materials compete together, and both performance and cost have be...

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): H01M4/62H01M4/36
CPCY02E60/12Y02E60/10
Inventor 卢永强周彦方
Owner HUBEI RONGBAI LITHIUM BATTERY MATERIAL 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