Core-shell structured Si-Li4Ti5O12 composite material

A composite material, shell structure technology, applied in structural parts, electrical components, electrochemical generators, etc., can solve the problems of volume expansion, low energy density, low reversible capacity, etc., and achieve the effect of reducing agglomeration and increasing capacity

Inactive Publication Date: 2016-11-23
CHINA ELECTRIC POWER RES INST +2
View PDF4 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium titanate itself also has shortcomings. Since lithium titanate itself can only accommodate 3 foreign lithium ions within the charge and discharge voltage range of 1-2.5V, its theoretical specific capacity is only 175mAh/g.
The low energy density has limited its application
[0004] Each negative electrode material has its own defects: graphite

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
  • Core-shell structured Si-Li4Ti5O12 composite material
  • Core-shell structured Si-Li4Ti5O12 composite material
  • Core-shell structured Si-Li4Ti5O12 composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0033] Attached below Figure 1~3 The technical solutions of the present invention will be clearly and completely described in detail with the specific embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0034] Core-Shell Si-Li 4 Ti 5 o 12 The preparation process of the composite material is as follows:

[0035] The first step: ① Prepare the inner layer solution, the specific steps are: slowly add the high molecular polymer into the mechanically stirred anhydrous ethanol, after mixing evenly, add the silicon powder negative electrode material to form a solution; ② Prepare the outer layer solution, the specific steps Method: Add a small amount of organic acid and lithium source into absolute...

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
Concentrationaaaaaaaaaa
Login to view more

Abstract

The invention provides a preparation method of core-shell structured Si-Li4Ti5O12 composite material. The preparation method comprises preparing outer-layer spinning liquid by mixing lithium source, titanium source, organic acid, high-molecular polymer and absolute ethanol; preparing inner-layer spinning liquid by high-molecule polymer, high-capacity anode material and anhydrous ethanol; preparing the core-shell structured Si-Li4Ti5O12 composite material by electrospinning and calcination. With the coaxial electrospinning technology, the different materials can be jet out from the inner and outer layers of solution to prepare the composite material with the coaxial structure, and a nanometer composite material with high-capacity negative electrode material as the core and the zero-strain material as the shell is formed.

Description

technical field [0001] The invention relates to a lithium titanate material, in particular to the preparation of a core-shell structure Si-Li by using a coaxial electrospinning method 4 Ti 5 o 12 composite material. Background technique [0002] With the continuous update of battery electrode materials, there are more and more types of batteries. The traditional battery anode material is generally graphite, and its theoretical specific capacity can reach 372mAh / g. However, since the lithium intercalation potential of graphite materials is around 0.1v, an SEI film will be formed during the first charge and discharge process, and the loss of lithium is relatively serious, resulting in a rapid decline in capacity. In addition, since the graphite anode material has a hexagonal layered structure, the intercalation and extraction of lithium ions have a great influence on its structure. After 400 cycles, the volume expansion of the graphite negative electrode has brought safet...

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): H01M4/36H01M4/38H01M4/485H01M10/0525
CPCH01M4/366H01M4/386H01M4/485H01M10/0525Y02E60/10
Inventor 王瑜东杨凯高飞尹秀娟刘皓张明杰
Owner CHINA ELECTRIC POWER RES INST
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