High-energy-density Ni-Co-based lithium ion positive electrode material and preparation method thereof

A high-energy-density, positive-electrode material technology, applied in the field of high-energy-density nickel-cobalt-based lithium-ion battery positive electrode materials and its preparation, can solve the problems of low initial charge and discharge efficiency, lower battery specific capacity, and less environmental pollution. Improve the first charge and discharge efficiency and energy density, improve safety performance and high temperature performance, and fully react

Inactive Publication Date: 2015-06-10
NANTONG RESHINE NEW MATERIAL
View PDF3 Cites 44 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] LiNi x co 1-x o 2 (0.62+ Difficult to completely oxidize to Ni 3+ , resulting in Ni during the high-temperature crystallization process 2+ with you 3+ There is a phenomenon of mixed cations between them, which will lead to defects such as poor thermal stability and low initial charge and discharge efficiency.
[0004] At present, in order to solve this problem, doping and coating modification, etc. have indeed improved the cation mixing phenomenon to a certain extent and stabilized the structure. However, since the doped or coated substance is an inactive substance, to a certain extent reduces the specific capacity of the battery

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

Embodiment 1

[0030] Precursor preparation: Ni:Co=0.6:0.4 was prepared into 0.5mol / L mixed solution A1, prepared 1.5mol / L sodium hydroxide solution and 0.5mol / L ammonium sulfate solution; poured pure water into the reaction vessel, And use 1.5mol / L sodium hydroxide solution to adjust the pH value of the initial solution to 8.5, adjust the temperature in the reaction vessel to 40°C, and the rotation speed to 200 r / min, and feed nitrogen; adjust the flow rate of the A1 solution to 20L / min, and at the same time Slowly add sodium hydroxide and ammonium sulfate dropwise, and when the particle size reaches the requirement, perform solid-liquid separation and dry to obtain the desired precursor A2.

[0031] Preparation of positive electrode material: Lithium hydroxide, A2, and aluminum hydroxide are prepared according to the molecular formula Li p Ni x co 1-x m m o 2 Mixing in the ratio, where p=1.25, x=0.6, m=0.12, the sintering temperature is controlled at 1050°C, the sintering time is 40h, ...

Embodiment 2

[0036] Precursor preparation: Ni:Co=0.85:0.15 is formulated into 3mol / L mixed solution A1, and 12mol / L sodium hydroxide solution and 5mol / L ammonium sulfate solution are prepared; pure water is injected into the reaction vessel, and 8mol / L L sodium hydroxide solution to adjust the pH value of the initial solution to 13.5, adjust the temperature in the reaction vessel to 80°C, the rotation speed to 200 r / min, and nitrogen gas; adjust the flow rate of the A1 solution to 3L / min, and slowly add hydrogen dropwise Sodium oxide and ammonium sulfate, when the particle size reaches the requirement, perform solid-liquid separation and dry to obtain the desired precursor A2.

[0037] Preparation of positive electrode material: Lithium hydroxide, A2, and aluminum hydroxide are prepared according to the molecular formula Li p Ni x co 1-x m m o 2Mixing in the ratio, where p=0.95, x=0.85, m=0.01, the sintering temperature is controlled at 400°C, the sintering time is 4h, oxygen is introd...

Embodiment 3

[0042] Precursor preparation: Ni:Co=0.80:0.20 is formulated into 2mol / L mixed solution A1, and 2.5mol / L sodium hydroxide solution and 1.8mol / L ammonium sulfate solution are prepared; pure water is injected into the reaction vessel, and 2.5mol / L sodium hydroxide solution to adjust the pH value of the initial solution to 12, adjust the temperature in the reaction vessel to 60°C, and the rotation speed to 500 r / min, and feed nitrogen; adjust the flow rate of the A1 solution to 10L / min, and slowly Sodium hydroxide and ammonium sulfate were added dropwise, and when the particle size reached the requirement, solid-liquid separation was performed and dried to obtain the desired precursor A2.

[0043] Preparation of positive electrode material: Lithium hydroxide, A2, and zirconium oxide according to molecular formula Li p Ni x co 1-x m m o 2 Mixing in the ratio, where p=0.11, x=0.80, m=0.04, the sintering temperature is controlled at 400°C, the sintering time is 4h, oxygen is intr...

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 discloses a high-energy-density Ni-Co-based lithium ion positive electrode material. The chemical general formula of a base material is LipNixCo1-xMmO2, M is a doping agent, and a clad material is an active material N; a positive electrode material of a lithium ion secondary battery is composed of second particles formed by gathering of primary particles, or primary particles, or mixed particles of primary particles and second particles. A preparation method of the high-energy-density Ni-Co-based lithium ion positive electrode material comprises the steps of preparation of a precursor of the lithium ion secondary battery positive electrode material and preparation of the lithium ion secondary battery positive electrode material. The Ni-Co binary precursor of the positive electrode material is subjected to a continuous coprecipitation reaction, elements are evenly mixed, the reaction is sufficient, and morphology control is facilitated; the cation mixing phenomenon is reduced through doping of proper elements in a binary high-nickel material, the structure is stabilized, safety and high-temperature performance of the battery material are improved, and the cladding active material improves first-time charge and discharge efficiency and the energy density of the material to a certain extent.

Description

technical field [0001] The invention relates to a positive electrode material of a lithium ion battery, in particular to a high energy density nickel-cobalt-based lithium ion battery positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of light weight, small size, high discharge platform, large capacity, long cycle life, and no memory effect, so they are widely used in mobile electronic devices such as mobile phones and notebook computers, and are also used in artificial satellites, electric vehicles, etc. Automotive, aerospace and other fields. [0003] LiNi x co 1-x o 2 (0.6<x<1) The positive electrode material has the advantages of lithium cobaltate and lithium nickelate, high discharge specific capacity, good cycle performance, low cost and less environmental pollution, but due to the presence of Ni in high-nickel materials 2+ Difficult to completely oxidize to Ni 3+ , resulting i...

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): H01M4/525H01M4/62
CPCH01M4/131H01M4/1391H01M4/366H01M4/525H01M10/0525H01M2004/028H01M4/62Y02E60/10C01G37/14C01G53/50C01P2004/84C01P2006/40H01M10/052
Inventor 李兴翠池田一崇宋文锋许国干王飞飞周罗承
Owner NANTONG RESHINE NEW MATERIAL
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