Document Type

Dissertation

Degree

Doctor of Philosophy (PhD)

Department

Materials Science and Engineering

First Advisor's Name

Wonbong Choi

First Advisor's Committee Title

Committee Chair

Second Advisor's Name

Norman D. H. Munroe

Third Advisor's Name

Jiuhua Chen

Fourth Advisor's Name

Nezih Pala

Keywords

Li-ion batteries, Carbon nanotubes, Nanomaterials, Current collector, Anode materials, 3D structure, a-Si/MWCNTs hybrid materials, Li-ion flexible battery, Graphene, Lamination, Anode stack, High areal mass density, High volumetric mass density, Free-standing multiwall carbon nanotubes (MWCNTs), High volumetric specific capacity

Date of Defense

6-28-2013

Abstract

A prototype 3-dimensional (3D) anode, based on multiwall carbon nanotubes (MWCNTs), for Li-ion batteries (LIBs), with potential use in Electric Vehicles (EVs) was investigated. The unique 3D design of the anode allowed much higher areal mass density of MWCNTs as active materials, resulting in more amount of Li+ ion intake, compared to that of a conventional 2D counterpart. Furthermore, 3D amorphous Si/MWCNTs hybrid structure offered enhancement in electrochemical response (specific capacity 549 mAhg-1). Also, an anode stack was fabricated to further increase the areal or volumetric mass density of MWCNTs. An areal mass density of the anode stack 34.9 mg/cm2 was attained, which is 1,342% higher than the value for a single layer 2.6 mg/cm2. Furthermore, the binder-assisted and hot-pressed anode stack yielded the average reversible, stable gravimetric and volumetric specific capacities of 213 mAhg-1 and 265 mAh/cm3, respectively (at 0.5C). Moreover, a large-scale patterned novel flexible 3D MWCNTs-graphene-polyethylene terephthalate (PET) anode structure was prepared. It generated a reversible specific capacity of 153 mAhg-1 at 0.17C and cycling stability of 130 mAhg-1 up to 50 cycles at 1.7C.

Identifier

FI13080904

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