slide1
Download
Skip this Video
Download Presentation
Graphene and Graphene-like Composites for anode materials in Li-ion battery Applications

Loading in 2 Seconds...

play fullscreen
1 / 16

Graphene and Graphene-like Composites for anode materials in Li-ion battery Applications - PowerPoint PPT Presentation


  • 721 Views
  • Uploaded on

Graphene and Graphene-like Composites for anode materials in Li-ion battery Applications. Proposal Presentation PHYS-570X. Presented by Suprem R. Das. Department of Physcs, and Birck Nanotechnology Center Purdue University West Lafayette, IN.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Graphene and Graphene-like Composites for anode materials in Li-ion battery Applications' - brandee


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1

Graphene and Graphene-like Composites for anode materials

in Li-ion battery Applications

Proposal Presentation

PHYS-570X

Presented by

Suprem R. Das

Department of Physcs, and Birck Nanotechnology CenterPurdue UniversityWest Lafayette, IN

slide2

Graphene and Graphene-like Composites for anode materials in Li-ion battery Applications

Seed research proposal submitted by

Suprem Ranjan Das†

† The Birck Nanotechnology Center and Department of Physics, Purdue University, West Lafayette, IN

Single layer graphene and few layer graphene, are recently shown to have numerous scientific and technological break-throughs having novel nanodevice applications, the most important ones being potential candidate for electronics and sensor applications. However, in order to drive these complex and tiny devices and circuits one needs the compatible power supply systems that must fit into the same circuits. Due to its very high electronic conductivity, this material could be thought of as fabricating the anode electrode in the Li-ion battery. In this proposal, we discuss the various approaches to make different types of graphene powders (both elemental and composite) and later use these materials to fabricate the anode for Li-ion battery. Prior to using it inside an electrochemical cell, various structural techniques such as IR spectroscopy, X-ray photoelectron spectroscopy and Raman spectroscopy could be used to identify the correct phase of the material. A prototype device using LiMn1.5Ni0.5O4 cathode and both liquid electrolyte (EC+DMC+LiPF6) and poly ethylene oxide (PEO) solid electrolyte is discussed .

slide3

Trends in battery technologies

Li-ion batteries are the key source of power supply for

wide applications

High energy density, design flexibility, and safest in use

However, technological advancement is not as aggressive as semiconductor industry because of the complexity in the device

Ref: Tarascon et al., Nature 414, 359, 2001

slide4

Charging and Discharging a Li-Ion battery

  • Current Li-Ion batteries use both cathode and anode as intercalated compounds
  • High energy density nature of a cell is a function of cell potential (V) and capacity (Ah/kg), both of which related to material chemistry

<= DFT calculations

Ref1: Tarascon et al., Electrochimica Acta 38, 1221, 1993

Ref2: Kganyago et al., Phys. Rev. B 68, 205111, 2003

slide5

Materials of Choice

However, current carbon/graphite anodes show high surface area Li-plating when fast recharged

Ref: Tarascon et al., Nature 414, 359, 2001

motivation for the graphene based anode
Motivation for the graphene-based anode
  • The reactivity of graphene sheet with Li-ion will be different along the plane and also along the edges (zig-zag and armchair)
  • In graphene based anodes, the Li-ions will be adsorbed on the two sides of the sheet and along the edges, there by increasing the capacity of the anode
  • Since the graphene powders are truly disordered, so the sheets are randomly oriented making it isotropic in all directions. Thus the storage of the Li-ion will be isotropic, again enhancing the capacity of the anode.
  • The disordered nature of the graphene based anode will overcome any kinds of ‘pulverization’ effects that is faced by recent high density intermatallic anodes, thereby expected to show improved rate capabilities
  • Reactivity of Li-ion towards graphene oxides or graphene-metal composite sheets may be higher than towards pure graphene, if so, it can produce even more high capacity and high rate capable Li-ion batteries
slide7

My Proposal:

  • To produce high quality graphene-anodes (both pure and composites with metals, e.g. Sn)
  • Use recently reported high energy LiMn1.5Ni0.5O4 spinel cathodes and layered LiMn0.5Ni0.5O2 cathodes
  • Fabricate prototype cells using both liquid electrolyte (EC+DMC with LiPF6 (1:1)) and PEO based solid electrolyte
  • 4. Study the charge-discharge behavior of the Li-ion in these cells
high quality graphene and graphene composite powders
High quality graphene and graphene composite powders

Exfoliation-reintercalation-expansion of graphite

Reducing GO using hydrazine

Dai et al, Stanford

H.Dai et al., Nature Nanotechnology 3, 538, 2008

V. C. Tung et al., Nature Nanotechnology 4, 25, 2009

Electrochemical modification of graphene to synthesize

Graphene-metal (Sn) composite

Solvothermal synthesis and sonification

M. Choucair et al., Nature Nanotechnology 4, 30, 2009

R.S. Sundaram et al., Adv. Mater. 20, 3050, 2008

characterization of graphene based materials
Characterization of graphene-based materials

H.Dai et al., Nature Nanotechnology 3, 538, 2008

A.C.Ferrari et al., PRL 97,187401, 2006

cell fabrication
Cell fabrication

Coin cell design

Thin film Lithium battery schematic

HS Test Cell

HS-3E Test Cell

Hand-operated crimping tool for coin cells

http://www.hohsen.co.jp/

(1) J. R. Dahn et al, Electrochimica Acta 38, 1179, 1993; (2) N. J. Dudney et al, Current Opinion in Solid State and Materials Science 4, 479, 1999

other instumentations
Other instumentations
  • Battery tester with software and PC
  • Glove box with inert atmosphere facility
  • Vacuum oven
  • Mixer
expected results
Expected results
  • Higher specific capacity for Li-ion batteries using graphene based anodes
  • Higher rate capabilities
  • High capacity retention after repeated cycling (over hundred cycles)
  • Safe in using in wide variety of applications
slide16

CONCLUSIONS

  • Though Carbon is the material of choice for anodes in Li-ion batteries for almost last two decades, still it has many problems
  • Graphene and graphene-based metal composites may overcome these obstacles
  • Graphene based anodes, being entirely disordered in nature and isotropic, is expected to produce high energy anodes
  • Due to zigzag and armchair configurations and exposures of both sides of graphene sheets to Li-ion environment, its adsorption of the same can be lot higher than the usual carbon or graphitic anodes

Acknowledgements: I Acknowledge Prof Y. P. Chen and all the colleagues participating in ‘Carbon Nanophysics’ course

ad