Tunable Single-Walled Carbon Nanotube Microstructure in the Liquid and Solid States Using Poly(acrylic acid)

Grunlan, Jaime C.; Liu, Lei; Kim, Yeon Seok

doi:10.1021/nl052486t

Cited by 150 publications

(120 citation statements)

References 44 publications

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“…[ 27 ] The LNMO particle surface contains active oxygen atoms which can react with LiPAA to form ester-like bonds. [ 28 ] CB particles are also covered by oxygenated surface groups that can readily interact with the carboxylate groups of LiPAA. These rich options for surface interactions result in the relatively uniform coverage provided by LiPAA.…”

Section: Role Of Lipaa As An Artifi Cial Cei Layermentioning

confidence: 99%

Lithium Polyacrylate (LiPAA) as an Advanced Binder and a Passivating Agent for High‐Voltage Li‐Ion Batteries

Pieczonka

Borgel

Ziv

et al. 2015

Advanced Energy Materials

222

192

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Intensive studies of an advanced energy material are reported and lithium polyacrylate (LiPAA) is proven to be a surprisingly unique, multifunctional binder for high‐voltage Li‐ion batteries. The absence of effective passivation at the interface of high‐voltage cathodes in Li‐ion batteries may negatively affect their electrochemical performance, due to detrimental phenomena such as electrolyte solution oxidation and dissolution of transition metal cations. A strategy is introduced to build a stable cathode–electrolyte solution interphase for LiNi0.5Mn1.5O4 (LNMO) spinel high‐voltage cathodes during the electrode fabrication process by simply using LiPAA as the cathode binder. LiPAA is a superb binder due to unique adhesion, cohesion, and wetting properties. It forms a uniform thin passivating film on LNMO and conducting carbon particles in composite cathodes and also compensates Li‐ion loss in full Li‐ion batteries by acting as an extra Li source. It is shown that these positive roles of LiPAA lead to a significant improvement in the electrochemical performance (e.g., cycle life, cell impedance, and rate capability) of LNMO/graphite battery prototypes, compared with that obtained using traditional polyvinylidene fluoride (PVdF) binder for LNMO cathodes. In addition, replacing PVdF with LiPAA binder for LNMO cathodes offers better adhesion, lower cost, and clear environmental advantages.

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Section: Role Of Lipaa As An Artifi Cial Cei Layermentioning

confidence: 99%

Lithium Polyacrylate (LiPAA) as an Advanced Binder and a Passivating Agent for High‐Voltage Li‐Ion Batteries

Pieczonka

Borgel

Ziv

et al. 2015

Advanced Energy Materials

222

192

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“…1b), resulted in the blueprints of a synthetic nanocomposite (Fig. 1c) in which interactions http://doc.rero.ch between the rigid fillers can be switched on and off [37] in response to a chemical stimulus. A low-modulus synthetic polymer matrix replaces the viscoelastic matrix of fibrillin microfibrils found in the natural model.…”

Section: Cellulose Whisker Nanofillermentioning

confidence: 99%

Biomimetic mechanically adaptive nanocomposites

Shanmuganathan

Capadona

Rowan

et al. 2010

Progress in Polymer Science

192

187

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The development of a new class of mechanically adaptive nanocomposites has been inspired by biological creatures such as sea cucumbers, which have the ability to reversibly change the stiffness of their dermis. Several recent studies have related this dynamic mechanical behaviour to the distinctive nanocomposite architecture of the collagenous tissue, in which interactions among rigid collagen fibrils, embedded in a viscoelastic matrix of fibrillin microfibrils, are regulated by neurosecretory proteins. Here we review the development of a new family of artificial polymer nanocomposites that mimic the architecture and the mechanic adaptability of the sea cucumber dermis. The new materials are based on low-modulus matrix polymers that are reinforced with a percolating cellulose nanofiber network. Owing to the abundance of surface hydroxyl groups, the cellulose nanofibers display strong interactions between themselves, causing the evenly dispersed percolating nanocomposites to display a high stiffness. The nanofiber-nanofiber interactions can be largely switched off by the introduction of a chemical regulator that allows for competitive hydrogen bonding, resulting in a significant decrease in the stiffness of the material.

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“…There have been three most widely used methods to disperse CNTs into solvents and polymer matrices: [3] physical blending, [4][5][6] chemical functionalization, [7][8][9][10][11] and dispersants-assisted dispersion. [12][13][14][15][16] Each of these methods has its own advantages and disadvantages. For physical blending using mechanical forces such as sonication, although simple and cost effective, the dispersion quality is often the poorest.…”

mentioning

confidence: 99%

Dispersion of Pristine Carbon Nanotubes Using Conjugated Block Copolymers

et al. 2008

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Despite many of the intriguing and excellent electrical, mechanical and optical properties of carbon nanotubes (CNTs), [1,2] extensive applications of these nanomaterials are still limited. One of the main challenges in carbon nanotube research field is the dispersion and stabilization of CNTs in different solvent media and polymer matrices. The as-synthesized CNTs are often bundled together due to strong van der Waals interactions between the nanotubes. There have been three most widely used methods to disperse CNTs into solvents and polymer matrices: [3] physical blending, [4][5][6] chemical functionalization, [7][8][9][10][11] and dispersants-assisted dispersion. [12][13][14][15][16] Each of these methods has its own advantages and disadvantages. For physical blending using mechanical forces such as sonication, although simple and cost effective, the dispersion quality is often the poorest. The so-dispersed nanotubes will quickly precipitate out again when sonication stops. For chemical modification and functionalization, CNTs are treated with strong oxidizing reagents to form functional groups such as carboxylic acids on the nanotube walls. CNTs can be made water or organic solvent soluble, depending on the modification degree and further molecular moieties attached to the nanotubes. Although most effective as a dispersion method, such treatment inevitably disrupts the long range p conjugation of the nanotube, often leads to decreased electrical conductivity, diminished mechanical strength, and other undesired properties. In the dispersants-assisted dispersion, a third component chemical is mixed with CNTs in solutions. Through sonication, the CNTs are mechanically de-bundled and then stabilized by a dispersant chemical through noncovalent interactions, therefore, avoiding the destruction of the chemical structures, electronic and mechanical properties of the carbon nanotubes. Recently, there are two types of materials that have attracted significant amount of attention as dispersants to assist carbon nanotube dispersion. One of these materials is the conjugated polymers, such as poly(m-phenylene vinylene), [17,18] poly(3-alkylthiophene), [19,20] and poly(arylene ethynylene). [21,22] These polymers stabilize carbon nanotubes by forming strong p-p stack interactions with carbon nanotube walls. However, the thus-formed dispersions have limited solubility and stability because the conjugated polymers themselves face solubility and miscibility issues due to the strong inter-chain p-p interactions. A second family of interesting materials with potential for third componentassisted carbon nanotube dispersion are block copolymers. [23][24][25] In general, the block copolymer is designed in such a way that one block of the polymer will form a close interaction with the carbon nanotube walls, while the other block(s) will provide the solubility to the exfoliated nanotubes by forming a steric barrier or repulsion interaction between polymer-wrapped nanotubes.[26] So far, a wide range of charged and neutral block copoly...

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Tunable Single-Walled Carbon Nanotube Microstructure in the Liquid and Solid States Using Poly(acrylic acid)

Cited by 150 publications

References 44 publications

Lithium Polyacrylate (LiPAA) as an Advanced Binder and a Passivating Agent for High‐Voltage Li‐Ion Batteries

Lithium Polyacrylate (LiPAA) as an Advanced Binder and a Passivating Agent for High‐Voltage Li‐Ion Batteries

Biomimetic mechanically adaptive nanocomposites

Dispersion of Pristine Carbon Nanotubes Using Conjugated Block Copolymers

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