Novel Nanocomposite Materials for Advanced Li-Ion Rechargeable Batteries

Cai, Chuan; Wang, Ying

doi:10.3390/ma2031205

Cited by 30 publications

(17 citation statements)

References 182 publications

(232 reference statements)

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“…Nanostructured composites consisting of the cathode material and a conductive additive allow to utilize theoretical capacity [13,14,26]. There are several parameters to be taken into account in order to make a nanocomposite applicable as a cathode material for lithium ion batteries.…”

Section: Introductionmentioning

confidence: 99%

Enhanced electrochemical performance of <30 nm thin LiMnPO4 nanorods with a reduced amount of carbon as a cathode for lithium ion batteries

Kwon

Fromm

2012

Electrochimica Acta

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5-10 nm thin rod shaped LiMnPO 4 nanoparticles are synthesized by an improved thermal decomposition method. The synthesis parameters such as the concentration of surfactants, reaction temperature and time, as well as the presence of a solvent play a critical role in the formation of spherical, thin or thick nanorods, and needle-shaped particles of LiMnPO 4 . A washing procedure to efficiently eliminate the surfactants attached to the surface of LiMnPO 4 nanoparticles is presented, avoiding thermal treatment at high temperatures. A nanocomposite LiMnPO 4 electrode provides a discharge capacity of 165 mAh/g at 1/40 C and 66 mAh/g at 1 C with only 10 wt% of total carbon additive. The characteristics of as-synthesized and low amount of carbon coated LiMnPO 4 are described as well as their electrochemical properties.

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Section: Introductionmentioning

confidence: 99%

Enhanced electrochemical performance of <30 nm thin LiMnPO4 nanorods with a reduced amount of carbon as a cathode for lithium ion batteries

Kwon

Fromm

2012

Electrochimica Acta

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“…[19][20][21] Many different types of carbon additives have been utilized in cathode laminates and differences in the physical properties such as surface area and porosity affect stability and performance. [22][23][24][25][26][27][28] However, studies of carbon additives at high potential (>4.6 V) are limited and typically have been investigated in the presence of active materials. 13,14,22,29 Herein, a systematic investigation of the stability of the inactive components of the cathode laminate and aluminum current collector of lithium ion battery at different storage potentials in the presence of LiPF 6 EC-based electrolyte is reported.…”

mentioning

confidence: 99%

Stability of Inactive Components of Cathode Laminates for Lithium Ion Batteries at High Potential

Chen

Nguyen

et al. 2014

J. Electrochem. Soc.

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The stability of inactive components in LIB (lithium ion batteries) electrodes upon exposure to high potentials can affect cell performance. A series of Li/ inactive component cells with aluminum, conductive carbon, and graphite as the inactive component were prepared and stored at high potential for one week. Electrochemical measurements and ex-situ surface analysis, including TEM (transmission electron microscopy), XPS (X-ray photoelectron spectroscopy), and FTIR (Fourier transform infrared spectroscopy), were conducted to investigate the stability of inactive components in the presence of LiPF 6 in 3:7 ethylene carbonate (EC) and ethyl methyl carbonate (EMC) electrolyte at different potentials. The results show that all components are stable upon storage at 4.3 V. Storage at 4.6 or 4.9 V results in no aluminum corrosion, but limited decomposition on conductive carbon and greater decomposition on graphite. Storage at 5.3 V results in significant electrolyte oxidation to generate poly(ethylene carbonate) on the surface of all inactive electrodes and aluminum corrosion.Lithium ion batteries (LIBs) have had great success for portable electronics applications since their initial commercialization in the 1990s. 1-3 However, the development of LIB for hybrid electric vehicles (HEVs) and electric vehicles (EVs), requires LIBs with higher energy and power density. Significant research has been conducted on the development of novel cathode active materials with a higher operating potential (> 4.5 V vs Li/Li + ) or higher capacity, such as high voltage spinel LiNi 0.5 Mn 1.5 O 4 and lithium magnesium rich NMC. [4][5][6][7][8][9][10][11] However, there are significant concerns regarding the stability of standard carbonate based electrolytes, LiPF 6 in a mixture of ethylene carbonate (EC) and dialkyl carbonates, at higher potential. 12 The cathode laminate of a typical lithium ion battery includes the active materials along with inactive components, such as carbonaceous materials (usually graphite or conductive carbon) to enhance the conductivity, polymeric binder (typically PVDF), and an aluminum current collector. While much effort has been expended on the development and investigation of active cathode materials, less attention has been given to the inactive components of the positive electrode. 13,14 The aluminum current collector is stable in LiPF 6 or LiBF 4 based electrolyte due to the formation of a passivation film at standard potential ranges (up to 4.3 V). 15-18 However, corrosion of aluminum is observed in this same potential range for other electrolyte salts. [19][20][21] Many different types of carbon additives have been utilized in cathode laminates and differences in the physical properties such as surface area and porosity affect stability and performance. [22][23][24][25][26][27][28] However, studies of carbon additives at high potential (>4.6 V) are limited and typically have been investigated in the presence of active materials. 13,14,22,29 Herein, a systematic investigation of the stability of the inac...

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“…There is considerable interest in understanding heat transport in nanomaterials . Nanomaterials with high thermal conductivity can be used to fabricate temperature‐dependent nanodevices.…”

Section: Introductionmentioning

confidence: 99%

Phonon Conductivity of Nanoparticles Embedded in Dielectric Material

Singh

Guo

Cid

et al. 2018

Physica Status Solidi (b)

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A theory of the thermal conductivity has been developed for nanomaterials made by embedding nanoparticles in a host dielectric material. The phonon dispersion relation has been calculated using the transfer matrix method in the long-range approximation, where the phonon wavelength is larger than the size of the nanoparticle. We found that these nanomaterials have two phonon branches known as ω þ k -phonon and ω À k -phonon branches. For both phonon branches, the density of states and the phonon velocity are calculated. The thermal conductivity is evaluated with the Kubo formalism and the Green's function method for both ω þ k -phonon and ω À k -phonon branches. It is also found that the density of states, phonon velocity and thermal conductivity for both phonon branches depend on the size of the nanoparticles, spacing between nanoparticles, and the phonon refractive index of the nanoparticles and the host material. In the long wave approximation, expressions of the phonon conductivity, the density of states and the phonon velocity have very simple forms which can be used by experimentalists to explain their experiments or plan new experiments. We have also applied our theory to explain the experimental thermal conductivity data of silica-resin, alumina-resin, AlN-resin and CaO-polyethylene nanomaterials. A good agreement between theory and experiments is achieved. Our results furthermore illustrate that one can fabricate new types of nanomaterials with high and low thermal conductivity by adjusting the refractive index contrast between nanoparticles and the host material. These are very novel and interesting properties and they can be used to fabricate new types of thermal devices.

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Novel Nanocomposite Materials for Advanced Li-Ion Rechargeable Batteries

Cited by 30 publications

References 182 publications

Enhanced electrochemical performance of <30 nm thin LiMnPO4 nanorods with a reduced amount of carbon as a cathode for lithium ion batteries

Enhanced electrochemical performance of <30 nm thin LiMnPO4 nanorods with a reduced amount of carbon as a cathode for lithium ion batteries

Stability of Inactive Components of Cathode Laminates for Lithium Ion Batteries at High Potential

Phonon Conductivity of Nanoparticles Embedded in Dielectric Material

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