Improved preparation method of large single crystal layered positive electrode material for lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of low volume energy density and achieve high phase purity, improved structural order, and simple steps

Active Publication Date: 2019-04-23
UNIV OF JINAN
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the above-mentioned layered cathode material Li 1+z [Ni 1-x-y co x mn y ] 1-z o 2 The relatively low volumetric energy density meets the needs of lithium-ion batteries with high volumetric energy density in the market. The applicant proposes to prepare micron-sized large single crystal layered positive electrode material Li 1+z [Ni 1-x-y co x mn y ] 1-z o 2 The new method, the specific content can be seen in the patent CN106910882, this method can better solve the layered cathode material Li in the prior art 1+z [Ni 1-x-y co x mn y ] 1-z o 2 The disadvantage of relatively low volumetric energy density

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
  • Improved preparation method of large single crystal layered positive electrode material for lithium ion battery
  • Improved preparation method of large single crystal layered positive electrode material for lithium ion battery
  • Improved preparation method of large single crystal layered positive electrode material for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031] The preparation method comprises the following steps:

[0032] The first step: preparing a Co-Mn precursor according to the molar ratio of the transition metal element shown in the general formula of the large single crystal layered positive electrode material;

[0033] There are many methods for preparing Co-Mn precursors in the prior art. From the perspective of synthesis effect, the present invention adopts the co-precipitation method to synthesize Co-Mn precursors. The types of the precursors include [Co 1-x mn x ](OH) 2 、[Co 1-x mn x ]CO 3 、[Co 1-x mn x ]C 2 o 4 or [Co 1-x mn x ]O y , can be prepared by conventional methods in the prior art, for example, by one or more of hydroxide, carbonate or oxalate co-precipitation methods.

[0034] The second step: Mix the Co-Mn precursor obtained in the above step with the lithium source evenly, wherein the molar ratio of lithium element to transition metal element is set to 0

    • Embodiment 1

    [0049] Embodiment 1 prepares precursor [Co1 / 2 mn 1 / 2 ](OH) 2

    [0050] Weigh 11.246Kg CoSO 4 ·7H 2 O and 6.76Kg MnSO 4 ·H 2 O preparation concentration is 20L of 2M salt solution. Add the above salt solution to 1L h -1 Add it dropwise into the continuously stirring reactor at a speed of 200rpm, and at the same time control the pH value in the kettle at about 11.0 with a mixed solution of 10M NaOH solution and 1M ammonia solution, until the salt solution is completely consumed, centrifuge, wash, and Dry to obtain the precursor [Co 1 / 2 mn 1 / 2 ](OH) 2 ,Such as figure 1 shown.

    Embodiment 2

    [0052] Take the precursor prepared by 90.94g embodiment 1 [Co 1 / 2 mn 1 / 2 ](OH) 2 with 18.47g battery-grade Li 2 CO 3 (Li / Co-Mn=0.5) was evenly mixed, and the mixture was placed in a muffle furnace and sintered in an air atmosphere at 950°C for 8h. Since the molar ratio Li / Co-Mn4 , since the spinel phase is easier to grow than the layered phase, micron-sized grains are obtained, and 46.35g of nano-sized Ni(OH) is further added to the micron-sized grains 2 and 38.61g battery-grade Li 2 CO 3 , so that Li / Ni-Co-Mn = 1.03, it was placed in a muffle furnace and sintered in an air atmosphere at 900°C for 12 hours to obtain a large single-crystal layered cathode material Li[Ni 1 / 3 co 1 / 3 mn 1 / 3 ]O 2 , its SEM and XRD such as figure 2 (b) and image 3 As shown in (b), the first-cycle charge-discharge curves and cycle stability of the electrodes prepared with large single-crystal layered cathode materials are as follows: Figure 4 shown.

    [0053] From figure 2 In (a), it ...

    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
    densityaaaaaaaaaa
    Login to view more

    Abstract

    The invention discloses an improved preparation method of a large single crystal layered positive electrode material for lithium ion batteries, comprising: firstly mixing a Co-Mn precursor with a lithium source, wherein the molar ratio of lithium element to transition metal element is 0-1 During the calcination at high temperature, spinel phase is formed due to insufficient lithium element. The spinel phase helps the fusion and growth of primary grains, and obtains primary grains of composite phase or primary phase of pure phase with larger micron size. crystal grain; then supplement the lithium source and nickel source of stoichiometric ratio to the primary crystal grain prepared above, so that the molar ratio of nickel element to cobalt and manganese element Ni / Co / Mn=(1‑x‑y) / x / y , the molar ratio of lithium element to transition metal element Li / Ni‑Co‑Mn=(1+z) / (1‑z)~(1+z) / (1‑z)+0.05, calcining medium lithium at high temperature The diffusion of ions and nickel ions initiates a solid-phase reaction to obtain a large single-crystal layered positive electrode material for lithium ion batteries.

    Description

    technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a micron-sized large single crystal layered lithium-ion battery cathode material and a preparation method thereof. Background technique [0002] As a high-energy-density energy storage technology, lithium-ion batteries have been widely used in "3C" portable electronic devices, and are gradually expanding to large-capacity, high-power systems such as electric tools and automobiles, high-efficiency energy storage and military systems. Compared with carbon negative electrodes with excellent comprehensive performance, high cost and low capacity cathode materials limit the performance improvement of lithium ion batteries and their wide application in large capacity and high power systems. Therefore, the development of low cost, high performance cathode materials is of great importance It is of great significance to promote the development of lithium-ion batte...

    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 Patents(China)
    IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
    CPCC01G53/44C01G53/50C01P2002/72C01P2004/03C01P2004/30C01P2004/61C01P2006/11C01P2006/40H01M4/505H01M4/525H01M10/0525H01M2004/021H01M2004/028Y02E60/10
    Inventor 侯配玉李凤
    Owner UNIV OF JINAN
    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