Unlock instant, AI-driven research and patent intelligence for your innovation.

Layered cathode material improved by organic acid and preparation method thereof

A positive electrode material and organic acid technology, applied in the field of layered positive electrode materials and preparation, can solve the problems of insignificant performance improvement such as the first coulombic efficiency of the material, reduce surface gas precipitation, and deteriorate the environment of the production workshop, so as to improve the comprehensive electrochemical performance , Improve the discharge specific capacity, improve the effect of cycle stability

Active Publication Date: 2021-01-12
XIAMEN UNIV
View PDF7 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Acid treatment can regulate the first coulombic efficiency by removing residual lithium on the surface of layered cathode materials, etc., but the use of inorganic strong acid treatment requires high equipment requirements, large pollution and is easy to cause serious corrosion to materials (Liu et al., EnergyStorage Materials, 2019, 16, 220-227)
[0005] Carbide coating can improve the rate performance and cycle stability of layered cathode materials by improving the electrical conductivity, but it cannot remove the residual lithium on the surface of the material and reduce the gas evolution on the surface, and the first Coulombic efficiency is still low.
[0006] Most of the acid treatment for layered positive electrode materials uses inorganic strong acids. The acid treatment process is violent, difficult to control and requires high equipment. The production process will deteriorate the production workshop environment, and the waste liquid is difficult to handle and easy to cause pollution. At the same time, it will be on the surface of the material even Different degrees of corrosion are caused inside, which is not conducive to the comprehensive performance of materials
There are still great deficiencies in the effect of surface modification of layered cathode materials by carbide coating and the improvement of their comprehensive performance, such as the inability to remove residual lithium on the surface of the material and carry out H + / Li + Exchange reaction, and the performance improvement of the first Coulombic efficiency of the material is not obvious

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
  • Layered cathode material improved by organic acid and preparation method thereof
  • Layered cathode material improved by organic acid and preparation method thereof
  • Layered cathode material improved by organic acid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] This embodiment includes the following steps:

[0022] (1) Preparation of lithium-rich manganese-based cathode material: 10g Ni 1 / 6 co 1 / 6 mn 2 / 3 CO 3 Place in a muffle furnace with a heating rate of 10°C / min, and calcinate in air at 500°C for 5 hours to obtain an oxide precursor. After cooling with the furnace, grind and mix the oxide precursor with 5g LiOH evenly, then place the mixture in a muffle furnace, and calcinate it in air at 900°C for 15h, with a heating rate of 10°C / min. After cooling with the furnace, The obtained molecular formula is 0.5Li(Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2 0.5Li 2 MnO 3 lithium-rich manganese-based cathode materials.

[0023] (2) Modification treatment: Measure a certain amount of carboxylic acid, pour it into a beaker containing the prepared lithium-rich manganese-based positive electrode material and soak for 6 hours, clean the soaked lithium-rich manganese-based positive electrode material with ethanol, and dry After drying, it was p...

Embodiment 2

[0029] This embodiment includes the following steps:

[0030] (1) Preparation of ternary cathode material: 10g Ni 1 / 3 co 1 / 3 mn 1 / 3 CO 3 Placed in a muffle furnace, calcined in oxygen at 500°C for 5h, with a heating rate of 10°C / min, to obtain an oxide precursor. After cooling with the furnace, grind and mix the oxide precursor and 4g LiOH evenly, then place the mixture in a muffle furnace, and calcinate it in oxygen at 900°C for 15h, with a heating rate of 10°C / min. After cooling with the furnace, the The molecular formula is LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 ternary cathode material.

[0031] (2) Modification treatment: Measure a certain amount of keto acid, pour it into a beaker containing the prepared ternary positive electrode material and soak for 12 hours, clean the soaked ternary positive electrode material with deionized water, and dry it Placed in a muffle furnace, calcined in oxygen at 600°C for 2h, with a heating rate of 10°C / min, to obtain organic acid treated s...

Embodiment 3

[0033] This embodiment includes the following steps:

[0034] (1) Preparation of lithium manganate cathode material: 10g MnCO 3 Placed in a muffle furnace, calcined in air at 500° C. for 5 h, with a heating rate of 10° C. / min, to obtain an oxide precursor. After cooling with the furnace, the oxide precursor was ground and mixed with 3g LiOH evenly, and then the mixture was placed in a muffle furnace and calcined in air at 900°C for 15h with a heating rate of 10°C / min. After cooling with the furnace, the obtained molecular formula is LiMnO 2 Lithium manganese oxide cathode material.

[0035](2) Modification treatment: measure a certain amount of hydroxy acid, add deionized water, stir evenly to form a certain concentration of hydroxy acid aqueous solution, pour it into a beaker containing the prepared lithium manganate cathode material and soak for 12 hours. The infiltrated lithium manganate cathode material was cleaned with acetone, dried, placed in a muffle furnace, and ca...

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
current efficiencyaaaaaaaaaa
Login to View More

Abstract

The invention discloses a layered cathode material improved by organic acid and a preparation method thereof, and relates to a lithium battery. The structural formula of the layered cathode material improved by the organic acid is xLiMO2.(1-x)Li2MO3, M is at least any one of Ni, Co, Mn, Fe, Al, W, Nb, Ti, Zr, V and other metal elements, and x is greater than or equal to 0 and less than or equal to1. The preparation method comprises the following steps: firstly, adding the layered cathode material into an organic acid solution for infiltration treatment, and then washing, drying and calciningthe treated layered cathode material to prepare the modified layered cathode material. The preparation method is simple, convenient, efficient, cheap in raw materials and easy for industrial mass production. The specific discharge capacity and the cycling stability are improved while the initial coulombic efficiency of the material is regulated and controlled, so that the comprehensive electrochemical performance of the layered cathode material is improved. And the organic acid can be recycled, so that the production cost and the environmental pollution are reduced.

Description

technical field [0001] The invention relates to a lithium battery, in particular to a layered positive electrode material improved by using an organic acid and a preparation method. Background technique [0002] Since the 1990s, lithium-ion batteries have gone from their early use in portable electronics to their widespread use in applications such as power grids and transportation. In order to meet the needs of the ever-expanding application market, it is urgent to improve the electrochemical performance of lithium-ion batteries and reduce their production costs from different levels, among which the development of high-performance lithium-ion battery cathode materials is the key (Ceder et al., Nature, 2018, 556, 185-190). [0003] At present, layered cathode materials are the most widely used in commercialized lithium-ion battery cathode materials. For example, lithium cobalt oxide dominates the electronics industry, high-nickel ternary materials are in the ascendant in t...

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): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525C01G45/12C01G53/00
CPCH01M4/366H01M4/505H01M4/525H01M4/625H01M4/628H01M10/0525C01G53/62C01G53/50C01G45/1257C01P2002/72C01P2006/40H01M2004/021H01M2004/028Y02E60/10
Inventor 彭栋梁郭慰彬谢清水王来森张晨莺罗晴
Owner XIAMEN UNIV
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com