Xavier CRISPIN, et al.
Related : MITLIN : NanoHemp SuperCapacitor
Storing electricity in paper
Part of the research group at Laboratory of Organic Electronics:
Jesper Edberg, Isak Engquist and Xavier Crispin.
Researchers at Linköping University’s Laboratory of Organic
Electronics, Sweden, have developed power paper – a new material
with an outstanding ability to store energy. The material consists
of nanocellulose and a conductive polymer. The results have been
published in Advanced Science.
EnergipappretOne sheet, 15 centimetres in diameter and a few
tenths of a millimetre thick can store as much as 1 F, which is
similar to the supercapacitors currently on the market. The
material can be recharged hundreds of times and each charge only
takes a few seconds.
It’s a dream product in a world where the increased use of
renewable energy requires new methods for energy storage – from
summer to winter, from a windy day to a calm one, from a sunny day
to one with heavy cloud cover.
”Thin films that function as capacitors have existed for some
time. What we have done is to produce the material in three
dimensions. We can produce thick sheets,” says Xavier Crispin,
professor of organic electronics and co-author to the article just
published in Advanced Science.
Other co-authors are researchers from KTH Royal Institute of
Technology, Innventia, Technical University of Denmark and the
University of Kentucky.
The material, power paper, looks and feels like a slightly
plasticky paper and the researchers have amused themselves by
using one piece to make an origami swan – which gives an
indication of its strength.
The structural foundation of the material is nanocellulose, which
is cellulose fibres which, using high-pressure water, are broken
down into fibres as thin as 20 nm in diameter. With the cellulose
fibres in a solution of water, an electrically charged polymer
(PEDOT:PSS), also in a water solution, is added. The polymer then
forms a thin coating around the fibres.
”The covered fibres are in tangles, where the liquid in the spaces
between them functions as an electrolyte,” explains Jesper Edberg,
doctoral student, who conducted the experiments together with
Abdellah Malti, who recently completed his doctorate.
The new cellulose-polymer material has set a new world record in
simultaneous conductivity for ions and electrons, which explains
its exceptional capacity for energy storage. It also opens the
door to continued development toward even higher capacity. Unlike
the batteries and capacitors currently on the market, power paper
is produced from simple materials – renewable cellulose and an
easily available polymer. It is light in weight, it requires no
dangerous chemicals or heavy metals and it is waterproof.
The Power Papers project has been financed by the Knut and Alice
Wallenberg Foundation since 2012.
”They leave us to our research, without demanding lengthy reports,
and they trust us. We have a lot of pressure on us to deliver, but
it’s ok if it takes time, and we’re grateful for that,” says
Professor Magnus Berggren, director of the Laboratory of Organic
Electronics at Linköping University.
The new power paper is just like regular pulp, which has to be
dehydrated when making paper. The challenge is to develop an
industrial-scale process for this.
”Together with KTH, Acreo and Innventia we just received SEK 34
million from the Swedish Foundation for Strategic Research to
continue our efforts to develop a rational production method, a
paper machine for power paper,” says Professor Berggren.
Power paper – Four world records
Highest charge and capacitance in organic electronics, 1 C and 2 F
(Coulomb and Farad).
Highest measured current in an organic conductor, 1 A (Ampere).
Highest capacity to simultaneously conduct ions and electrons.
Highest transconductance in a transistor, 1 S (Siemens)
An Organic Mixed Ion-Electron
Conductor for Power Electronics
Abdellah Malti, et al.
A mixed ionic–electronic conductor based on nanofibrillated
cellulose composited with
with high boiling point solvents is demonstrated in bulky
electrochemical devices. The high electronic and ionic
conductivities of the resulting nanopaper are exploited in devices
which exhibit record values for the charge storage capacitance
(1F) in supercapacitors and transconductance (1S) in
Related Nanopaper Patents
Graphene oxide reinforced composite carbon nanopaper and
production method thereof
Inventor(s): LI QINGWEN; XING YAJUAN; CHEN MINGHAI
The invention discloses a graphene oxide reinforced composite
carbon nanopaper and a production method thereof. The above carbon
paper includes: a carbon nanotube substrate including a skeleton
network mainly formed by carbon nanotubes; and at least an
enhanced network for connecting the carbon nanotubes in the
skeleton network, wherein the enhanced network is mainly formed by
graphene oxide dispersed in the skeleton network. The production
method comprises the following steps: uniformly mixing a carbon
nanotube dispersion with a graphite oxide graphene dispersion
filtering to form a film, and peeling the formed film from a
substrate filter film in order to obtain a target product. The
composite carbon nanopaper has greatly improved mechanical
properties, has no apparent loss of the excellent electrical
conductivity or thermal conductivity, fully solves the problem of
poor mechanical strength of present carbon tube nanopaper, and has
the characteristics of electrical conduction, thermal conduction,
light weight, flexibility and high efficiency. The production
method has the advantages of simplicity, easy operation, good
controllability, low cost and wide application prospect.
HIGH EFFICIENCY PRODUCTION OF NANOFIBRILLATED CELLULOSE
Inventor(s): BILODEAU MICHAEL / PARADIS MARK
A scalable, energy efficient process for preparing cellulose
nanofibers is disclosed. The process employs treating the
cellulosic material with a first mechanical refiner with plates
having a configuration of blades separated by grooves, and
subsequently treating the material with a second mechanical
refiner with plates having a configuration of blades separated by
grooves different than the first refiner. The plate configurations
and treatment operations are selected such that the first refiner
produces a first SEL that is greater than the SEL of the second
refiner, by as much as 2-50 fold. An exemplary high first SEL may
be in the range of 1.5 to 8 J/m. Paper products made with about 2%
to about 30% cellulose nanofibers having a length from about 0.2
mm to about 0.5 mm, preferably from 0.2 mm to about 0.4 mm have
METHOD FOR PRODUCING NANOFIBRILLAR CELLULOSE
Inventor(s): LAUKKANEN ANTTI [FI]; NUOPPONEN MARKUS
In a method for preparing nanofibrillar cellulose, fibrous
dispersion of ionically charged cellulose is repeatedly passed
through a mechanical process of disrupting fibers into fibrils
until the viscosity starts to decrease. The number average
diameter of the nanofibrillar cellulose after the mechanical
process is in the range of 2-10 nm, and the zero-shear viscosity
is below 10 Pas, preferably below 1 Pas, when measured in the
concentration of 0.5 wt-%. The nanofibrillated cellulose is low
aspect ratio nanofibrillated cellulose (NFC-L).
NANOCELLULOSE PRODUCTION USING LIGNOSULFONIC ACID
Inventor(s): NELSON KIMBERLY [US]; RETSINA THEODORA [US];
PYLKKANEN VESA [US]; O'CONNOR RYAN
Processes disclosed are capable of converting biomass into
high-crystallinity nanocellulose with low mechanical energy input.
In some variations, the process includes fractionating biomass
with lignosulfonic acids, to generate cellulose-rich solids; and
mechanically treating the cellulose-rich solids to form
nanofibrils and/or nanocrystals. The strong lignosulfonic acids
created during delignification give a pH less than 1 and hydrolyze
preferentially the amorphous regions of cellulose. The total
mechanical energy may be less than 500 kilowatt-hours per ton. The
crystallinity of the nanocellulose material may be 80% or higher,
translating into good reinforcing properties for composites. The
nanocellulose material may include nanofibrillated cellulose,
nanocrystalline cellulose, or both. In some embodiments, the
nanocellulose material is hydrophobic via deposition of lignin
onto the cellulose surface. Optionally, sugars derived from
amorphous cellulose and hemicellulose may be separately fermented
METHOD FOR PRODUCING MODIFIED CELLULOSE
Inventor(s): PALTAKARI JOUNI, et al.
The present invention provides a method for producing modified
nanofibrillated cellulose characterized by bringing cellulosic
material into a fiber suspension, adsorbing a cellulose derivative
or polysaccharide or polysaccharide derivative onto fibers in said
fiber suspension under special conditions and subjecting the
obtained fiber suspension derivative to mechanical disintegration.
A modified nanofibrillated cellulose obtainable by a method of the
present invention is provided. Furthermore, the invention relates
to the use of said modified nanofibrillated cellulose.
CELLULOSE-BASED MATERIALS COMPRISING NANOFIBRILLATED
CELLULOSE FROM NATIVE CELLULOSE
Inventor(s): BERGLUND LARS / SEHAQUI HOUSSINE / ZHOU QI
The present invention relates to cellulose-based materials
comprising nanofibrillated cellulose (NFC) from native cellulose.
exhibiting highly superior properties as compared to other
cellulose-based materials, a method for preparing such
cellulose-based material, and uses thereof are also disclosed.
PROCEDURE FOR OBTAINING NANOFIBRILLATED CELLULOSE FROM
Inventor(s): GONZALEZ MIGUEL PABLO, et al.
A process for obtaining nanofibrillated cellulose, starting from a
raw material consisting of recycled or recovered paper, or
recovered paper pulp or recovered cellulose, comprises immersing
the raw material in an acetic acid solution, in a concentration of
10% to 50% by volume, during a time inverse to the concentration
of acetic acid, stirring the raw material immersed in the acetic
acid solution, and subsequently subjecting the cellulosic material
to a mechanical process of longitudinal separation of fibres, by
shear forces applied through a mixer or similar equipment capable
of creating enough shearing on cellulose pulp. The nanofibrillated
cellulose obtained from recycled paper using this process has
similar features compared to nanofibrillated cellulose obtained
from virgin cellulose.
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