Treatment method for ternary material and method for improving capacity and cycle performance of lithium battery

A technology of ternary materials and processing methods, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of poor cycle stability and safety performance, achieve good electrochemical performance, simple method process, improve battery capacity and The effect of cycle performance

Active Publication Date: 2011-11-09
SHENZHEN BAK POWER BATTERY CO LTD
View PDF6 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at high voltage, LiNi x co y mn z o 2 The material is easy to react with the electr

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
  • Treatment method for ternary material and method for improving capacity and cycle performance of lithium battery
  • Treatment method for ternary material and method for improving capacity and cycle performance of lithium battery
  • Treatment method for ternary material and method for improving capacity and cycle performance of lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0033] (2) Preparation of surface treatment materials:

[0034] Prepare a cobalt salt solution with an appropriate concentration, preferably 1-10 mol / L, and gradually add the cobalt salt solution to the above-mentioned pH-adjusted LiNi under constant stirring conditions x Co y Mn z O 2 (x+y+z=1) suspension. And fully react at room temperature with constant stirring, preferably for 1-5 hours, and then preferably dry in an oven at 100-150°C.

[0035] The cobalt salt is added to introduce the cobalt element. Therefore, all soluble cobalt salts that can be burned and removed in the subsequent burning process except cobalt can be applied to the present invention. For example, cobalt acetate and citric acid can be used At least one of cobalt salt or cobalt nitrate salt.

[0036] (3) Preparation of final materials:

[0037] Add an appropriate amount of lithium salt to the dried material, fully mix and burn in an air atmosphere at an appropriate burning temperature, preferably burning at 500...

Example Embodiment

[0043] Example 1

[0044] Weigh 200g LiNi accurately 0.4 Co 0.2 Mn 0.4 O 2 The ternary powder material is adjusted to muddy with an appropriate amount of water, and an ammonia solution with a concentration of 10mol / L is configured. Under constant stirring, 200g of LiNi 0.4 Co 0.2 Mn 0.4 O 2 Adjust the pH value of the suspension to 11.0 to make the mixture strongly alkaline. Weigh 20g Co(NO 3 ) 2 The concentration of the solution is adjusted to 10mol / L. Under the condition of constant stirring, the cobalt salt solution is gradually added to the adjusted LiNi 0.4 Co 0.2 Mn 0.4 O 2 Suspension. When the cobalt salt solution is completely added to LiNi 0.4 Co 0.2 Mn 0.4 O 2 When in the suspension, the reaction is continued for 5 hours at room temperature under constant stirring, and the precursor prepared by the reaction is dried in an oven at 100-150°C. Finally, accurately weigh 2.5g of LiOH powder, mix the dried precursor and LiOH powder uniformly, and place it in a muffle furnace. I...

Example Embodiment

[0045] Example 2

[0046] Accurately weigh 200g LiNi 0.4 Co 0.2 Mn 0.4 O 2 The ternary powder material is adjusted to muddy with an appropriate amount of water, and an ammonia solution with a concentration of 10mol / L is configured. Under constant stirring, 200g of LiNi 0.4 Co 0.2 Mn 0.4 O 2 Adjust the pH value of the suspension to 11.0 to make the mixture strongly alkaline. Weigh accurately 27.5g Co(NO 3 ) 2 The concentration of the solution is adjusted to 10mol / L. Under constant stirring, the cobalt salt solution is gradually added to the adjusted LiNi 0.4 Co 0.2 Mn 0.4 O 2 Suspension. When the cobalt salt solution is completely added to LiNi 0.4 Co 0.2 Mn 0.4 O 2 When in the suspension, the reaction is continued for 5 hours at room temperature under constant stirring, and the precursor prepared by the reaction is dried in an oven at 100-150°C. Finally accurately weigh 5.6gLi 2 CO 3 Powder, the dried precursor and Li 2 CO 3 After the powder is mixed uniformly, it is placed in a m...

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
Login to view more

Abstract

The invention discloses a treatment method for a ternary material LiNixCoyMnzO2(x+y+z). The method comprises the following steps of: firstly, adjusting the pH value of a LiNixCoyMnzO2 material to be alkaline or strongly alkaline and range from 8.0 to 12.0; secondly, gradually adding a cobalt salt solution into the alkaline or strongly alkaline LiNixCoyMnzO2 turbid liquid; and finally, drying the mixed material, adding a proper amount of lithium salt, and firing the mixture for 5 to 24 hours at a proper temperature in an air atmosphere to prepare the LiNixCoyMnzO2 material with a LiCoO2 treated surface. The method is simple in process; and the prepared product has high electrochemical performance within a high voltage range and is favorable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a ternary material processing method, the ternary material obtained by the processing method, and a method for improving the capacity and cycle performance of a lithium-ion battery with the ternary material as the positive electrode material, The ternary material is LiNi x co y mn z o 2 , x+y+z=1. Background technique [0002] Lithium-ion secondary batteries have many advantages such as long cycle life, stable discharge voltage, large specific capacity, and no memory effect, making them widely used in many fields such as mobile phones, notebook computers, and portable electronic devices, and are increasingly popular among the public. Attention and favor. [0003] In 2001, Japanese scientist T. Ohzuku's research group synthesized Li(Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2 positive electrode material, and reported its electrochemical performance as a lithium ion battery po...

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
IPC IPC(8): H01M4/1391H01M4/48
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 相江峰
Owner SHENZHEN BAK POWER BATTERY 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