Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Negative electrode material, lithium ion battery and preparation method of negative electrode material

A negative electrode material, lithium titanate technology, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve the problems of material rupture, poor cycle performance of alloy materials, etc., and achieve high rate charge and discharge Performance, good market prospects, and the effect of improving charge transport characteristics

Inactive Publication Date: 2019-02-12
QINGHAI UNIVERSITY
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the alloy material reacts with lithium ions during the charging and discharging process to form the intermetallic compound LixMy, and at the same time, the crystal structure reorganizes, accompanied by a large volume expansion, which causes the material to crack and pulverize, resulting in poor cycle performance of the alloy material. Difference

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
  • Negative electrode material, lithium ion battery and preparation method of negative electrode material
  • Negative electrode material, lithium ion battery and preparation method of negative electrode material
  • Negative electrode material, lithium ion battery and preparation method of negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020] The preparation steps of the present invention include two parts: (1) preparation of carbon-silicon-carbon nano-arrays: preparing carbon-silicon-carbon nano-arrays using anodic aluminum oxide (AAO) templates and two-step chemical vapor phase method; (2) preparation of lithium titanate precursors Preparation: use Tween 80, Span 80, ethylene glycol, TiO 2 Powder, LiOH·H 2 O is used as a raw material to prepare the precursor of lithium titanate; (3) Preparation of carbon-silicon-carbon nanoarrays doped with lithium titanate: under the condition of mechanical stirring, the precursor of lithium titanate and the carbon-silicon-carbon nanoarray Mix well, and add the mixture into a high-pressure reactor for hydrothermal synthesis, then cool naturally to room temperature, filter, centrifuge, wash and dry the hydrothermal product in vacuum to obtain carbon silicon carbon nanoparticles doped with lithium titanate array.

[0021] The preparation concrete technology of the present...

Embodiment 1

[0030] Preparation of carbon-silicon-carbon nanoarrays: Place the template AAO in the corundum ark, put it into the heating zone of the tube furnace, raise the temperature to 800°C at 10°C / min under an argon atmosphere, and feed acetylene gas with a flow rate of 50sccm for 45min. Cool down naturally after 2 hours of heat preservation. The high-temperature gas-phase decomposition of acetylene yielded carbon nanotube arrays contained in the AAO template, which were subjected to plasma etching for 10 min and soaked in hydrofluoric acid for 2 h to remove the template AAO. Put the carbon nanotube array without the template AAO on the self-made aluminum support, then put it in the corundum ark, put it into the heating zone of the tube furnace, and use the mechanical pump and the diffusion pump to evacuate to 5Pa and 10Pa in turn. - 2 Pa. The temperature was programmed to rise to 800°C, the diffusion pump was stopped, and silane gas with a flow rate of 60 sccm was introduced for 45...

Embodiment 2

[0035] The formation method of the lithium-ion battery is the same as in Example 1, wherein the flow rate of silane gas in the preparation of the carbon-silicon-carbon nanoarray is 50 sccm.

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
thicknessaaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a negative electrode material, a lithium ion battery and a preparation method of the negative electrode material. The preparation method of the negative electrode material comprises the following steps: preparing a carbon-silicon-carbon nano array; preparing a lithium titanate precursor; mixing the lithium titanate precursor and the carbon-silicon-carbon nano array in the weight percentage of (10 to 35) to 100, adding ammonium hydroxide after uniformly mixing the mixture, sealing, performing a solvothermal reaction, washing a prepared sample with deionized water and absolute ethyl alcohol respectively, drying the washed sample, preserving heat in a tubular furnace for a certain period of time, and cooling to room temperature to obtain the negative electrode material. By adopting the preparation method, functional optimization is performed on the carbon-silicon-carbon nano array by using lithium titanate particles, so that the charge transfer feature of the carbon-silicon-carbon nano array can be further improved in order to bring the high-rate charging-discharging performance into full play.

Description

technical field [0001] The invention relates to a negative electrode material, a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high energy density, light weight, small size, small internal resistance, less self-discharge, long cycle life, no memory effect, and environmental friendliness. Fields such as mobile communications, electric vehicles, hybrid fuel vehicles and national defense technology have huge market potential. [0003] As a key material in lithium-ion batteries, the performance of the anode material will directly affect the overall performance of the battery. At present, carbon materials are the main materials for the negative electrodes of commercial lithium-ion batteries at home and abroad. Japan's Sanyo Corporation uses high-quality natural graphite to interact with an appropriate amount of water vapor at high temperatures to improve its ability to intercalate l...

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): H01M4/36H01M4/485H01M4/62H01M10/0525B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/485H01M4/625H01M10/0525Y02E60/10
Inventor 南辉王刚韦浩民杨桂军陈慧媛王冲苏丽萍邹帅李春梅
Owner QINGHAI UNIVERSITY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com