View gallery - 4 images The high energy capacity of lithium-ion batteries has led to them powering everything from tiny mobile devices to huge trucks. But current lithium-ion battery technology is nearing its limits and the search is on for a better lithium battery. But one thing stands in the way: If a new technology by Rice University scientists lives up to its potential, it could solve this problem and enable lithium-metal batteries that can hold three times the energy of lithium-ion ones.
Graphene-nanotube hybrid boosts lithium metal batteries Rice University prototypes store 3 times the energy of lithium-ion batteries HOUSTON — May 18, — Rice University scientists have created a rechargeable lithium metal battery with three times the capacity of commercial lithium-ion batteries by resolving something that has long stumped researchers: The Rice battery stores lithium in a unique anode, a seamless hybrid of graphene and carbon nanotubes.
The material first created at Rice in is essentially a three-dimensional carbon surface that provides abundant area for lithium to inhabit.
Lithium metal coats the hybrid graphene and carbon nanotube anode in a battery created at Rice University. The lithium metal coats the three-dimensional structure of the anode and avoids forming dendrites. Dendrites have bedeviled attempts to replace lithium-ion with advanced lithium metal batteries that last longer and charge faster.
If they bridge the anode and cathode and create a short circuit, the battery may fail, catch fire or even explode. Rice researchers led by chemist James Tour found that when the new batteries are charged, lithium metal evenly coats the highly conductive carbon hybrid in which nanotubes are covalently bonded to the graphene surface.
As reported in the American Chemical Society journal ACS Nanothe hybrid replaces graphite anodes in common lithium-ion batteries that trade capacity for safety. The lithium is evenly distributed, spreading out the current carried by ions in the electrolyte and suppressing the growth of dendrites.
An electron microscope image shows a carbon nanotube evenly coated with lithium metal. Tests on the graphene-carbon nanotube anode created at Rice University show it resists the formation of lithium dendrites that can damage batteries.
Because of the low density of the nanotube carpet, the ability of lithium to coat all the way down to the substrate ensures maximum use of the available volume, he said. At that moment, we knew we had found something special. Electron microscope images of the anodes after testing showed no sign of dendrites or the moss-like structures that have been observed on flat anodes.
To the naked eye, anodes within the quarter-sized batteries were dark when empty of lithium metal and silver when full, the researchers reported. A graphic shows carbon nanotubes covalently bonded to a graphene substrate.
The material created at Rice University is being tested as an anode for high-capacity lithium metal batteries. Tour is the T. Chao Chair in Chemistry as well as a professor of computer science and of materials science and nanoengineering at Rice.
Wiess School of Natural Sciences:Graphene/Li-Ion battery Narjes Kheirabadi 1*, Azizollah Shafiekhani 2, 3** 1Department of Physics, graphene sheet can be spirally wrapped into a single wall carbon nanotube.
Multiple graphene Because of its well-known high carrier mobility and its inherited two-dimensional shape with.
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. Carbon nanotubes, in different forms and architectures, have demonstrated good promise as electrode material for Li-ion batteries, owing to large surface area, shorter Li-conduction distance and. Large scale patternable 3-dimensional carbon nanotube–graphene structure for flexible Li-ion battery.
Carbon Nanotubes Boost Power of Lithium Battery. lithium-ion batteries that have electrodes roughly to micrometers thick. used to make the 3-micrometer-thick carbon nanotube. 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.
Carbon nanotubes, in different forms and architectures, have demonstrated good promise as electrode material for Li-ion batteries, owing to large surface area, shorter Li-conduction distance and.
In this study, we report a novel route via microwave irradiation to synthesize a bio-inspired hierarchical graphene–nanotube–iron three-dimensional nanostructure as an anode material in lithium-ion batteries. The nanostructure comprises vertically aligned carbon nanotubes grown directly on graphene sheets along with shorter branches of carbon nanotubes stemming out from both the graphene.
three-dimensional structure is attributed to the excellent self-assembly of carbon nanotubes with graphene, silicon, Li-ion battery, carbon nanotube (Some ﬁgures may appear in colour only in the online journal) 1.
Introduction Owing to the advantages of their high energy density, long cycle life and low cost, lithium-ion batteries are now.