Carbon-coated nanofiber material, preparation method thereof and battery

A nanofiber, carbon coating technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor electronic and ionic conductance, poor performance of lithium-ion batteries, etc., to achieve large specific surface area, increase reactivity The effect of site, enhanced rate capability and cycling performance

Inactive Publication Date: 2021-10-22
南方电网电动汽车服务有限公司
View PDF6 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But LiMPO 4 The positive electrode material has poor electronic conductance and ion conductance, and its room temperature lithium ion diffusion coefficient DLi- 14 cm 2 the s -1 , electronic conductivity -10 S / cm, so LiMPO 4 Poor performance of lithium-ion batteries made of cathode materials

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
  • Carbon-coated nanofiber material, preparation method thereof and battery
  • Carbon-coated nanofiber material, preparation method thereof and battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] A preparation method of carbon-coated nanofibrous material, comprising the following steps:

[0036] Dissolving the metal organic salt, lithium salt, the first polymer binder, and the first organic carbon source in the first organic solvent to prepare a spinning core layer solution; the metal elements in the metal organic salt are Fe, Ni, Mn, Co or V;

[0037] Dissolving the second polymer binder and the second organic carbon source in the second organic solvent to prepare a spinning sheath solution;

[0038] The coaxial electrospinning technology is used to spin the spinning core layer solution and the spinning shell layer solution under preset conditions to form fibers with a core-shell structure, and sinter the fibers with the core-shell structure in an inert atmosphere.

[0039] The in-situ carbon-coated three-dimensional carbon skeleton nanofiber material is formed by coating the carbon layer on the surface of the nanofiber material in situ by coaxial electrospinn...

Embodiment 1

[0067] figure 1 It is a schematic diagram of the process flow for preparing carbon-coated nanofibers in this example, and the specific steps are as follows:

[0068] 1) Preparation of spinning core layer solution

[0069] Lithium acetate, manganese acetate, iron acetate and phosphoric acid were dissolved in deionized water at a molar ratio of 1:0.6:0.4:1 to prepare a first solution with a concentration of 0.5 mol / L. Polyvinylpyrrolidone (PVPK90) and glucose were dissolved in ethanol, wherein the mass fractions of polyvinylpyrrolidone and glucose were both 5%, to prepare a second solution. The first solution and the second solution are mixed according to a volume ratio of 1:1, and stirred evenly to obtain a spinning core layer solution.

[0070] 2) Preparation of spinning sheath solution

[0071] Polyvinylpyrrolidone (PVPK90) and glucose were dissolved in ethanol, wherein the mass fractions of polyvinylpyrrolidone and glucose were both 5%, to prepare a spinning sheath soluti...

Embodiment 2

[0076] The preparation method of this example is basically the same as that of Example 1, except for the concentration of the first solution in the spinning core layer solution. Specific steps are as follows:

[0077] 1) Preparation of spinning core layer solution

[0078] Lithium acetate, manganese acetate, iron acetate and phosphoric acid were dissolved in deionized water at a molar ratio of 1:0.6:0.4:1 to prepare a first solution with a concentration of 0.55 mol / L. Polyvinylpyrrolidone (PVPK90) and glucose were dissolved in ethanol, wherein the mass fractions of polyvinylpyrrolidone and glucose were both 5%, to prepare a second solution. The first solution and the second solution are mixed according to a volume ratio of 1:1, and stirred evenly to obtain a spinning core layer solution.

[0079] 2) Preparation of spinning sheath solution

[0080] Polyvinylpyrrolidone (PVPK90) and glucose were dissolved in ethanol, wherein the mass fractions of polyvinylpyrrolidone and gluc...

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
quality scoreaaaaaaaaaa
Login to view more

Abstract

The invention relates to the field of lithium ion battery electrode materials, in particular to a carbon-coated nanofiber material, a preparation method thereof and a battery. The preparation method of the carbon-coated nanofiber material comprises the following steps: dissolving metal organic salt, lithium salt, a first polymer binder and a first organic carbon source in a first organic solvent, and preparing a spinning core layer solution, wherein metal elements in the metal organic salt are Fe, Ni, Mn, Co or V; dissolving a second polymer binder and a second organic carbon source in a second organic solvent to prepare a spinning shell solution; and spinning the spinning core layer solution and the spinning shell layer solution under a preset condition by using a coaxial electrostatic spinning technology to form fibers, and sintering the fibers in an inert atmosphere. According to the method, the fiber can be subjected to in-situ carbon coating, and the electrical property of the battery is improved. The invention also provides the carbon-coated nanofiber material prepared by the preparation method and a battery comprising the material.

Description

technical field [0001] The invention relates to the field of lithium-ion battery electrode materials, in particular to a carbon-coated nanofiber material, a preparation method thereof, and a battery. Background technique [0002] Lithium-ion battery is a commonly used battery, and the quality of the positive electrode material in the lithium-ion battery determines the performance of the lithium-ion battery. Among them, the polyanion positive electrode material has a stable polyanion framework structure, so that the lithium ion battery has excellent safety performance, good overcharge resistance and cycle stability. Among them, olivine-type phosphate LiMPO 4 (M=Fe, Mn, Co, Ni, V) is the most promising cathode material for power batteries. Compared to LiCoO 2 , the battery made by using it has stable structure during charge and discharge, long charge and discharge life, high specific capacity, rich raw material resources, and will not pollute the environment. But LiMPO 4 ...

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): H01M4/58H01M4/62H01M10/0525
CPCH01M4/5825H01M4/625H01M10/0525H01M2004/028Y02E60/10
Inventor 陈浩舟李勋黄鹏李蓝特邹大中
Owner 南方电网电动汽车服务有限公司
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