Here, we report that transition-metal dichalcogenides such as MoS2 and WS2 can be decorated with gold nanoparticles by a spontaneous redox reaction hexachloroauric acid in water. The resulting tend to grow at defective sites, therefore, selective decorations the edges line defects basal planes of bulk single crystals were observed. lithium intercalation-exfoliation process makes chemically exfoliated sheets much more than their single-crystalline counterparts, leading uniform higher-density...

MoSx is grown on crumpled graphene particles supported carbon cloth substrates for the hydrogen evolution reaction. Modifying with allows higher loading levels of and thus significantly enhances its electrocatalytic activity. Measurements yield a current density –220 mA cm−2 at an overpotential 0.3 V (before iR correction) crumpled-graphene-modified cloth.

A key degradation mechanism in lithium-ion batteries (LIBs) is the irreversible loss of cyclable lithium during cycling. At graphite negative electrode, this occurs through deposition lithium-containing compounds solid-electrolyte interphase (SEI) and plating metallic lithium, resulting so-called dead lithium. The separate quantification SEI has so far been a challenge post mortem analysis commercial LIBs. Here we report simple fast 7Li nuclear magnetic resonance spectroscopy (NMR) protocol...

Conditions such as the temperature and pressure experienced by lithium-ion battery components are dependent on cell geometry can vary widely within a large cell. The resulting uneven degradation is challenging to study at full level but be revealed upon disassembly post mortem analysis. In this work, we report localized lithium plating in automotive-grade, prismatic cells, also under cycling conditions generally considered mild (e.g., 5–65 %SOC, 23 °C, 0.5C cycle rate). Dead content...

In this perspective, we describe a new type of photovoltaic all-carbon composites, in which single walled carbon nanotubes (SWCNTs) and fullerenes are directly co-assembled processed water using graphene oxide (GO) as surfactant. Solar cells made with C60/SWCNTs/reduced GO the active layer an additional evaporated C60 blocking yield power conversion efficiency 0.21%, can be significantly increased to 0.85% by replacing better absorber C70. These results suggest possibility making generation...

Lithium ion batteries (LIB) have become a cornerstone of the shift to electric transportation. In an attempt decrease production load and prolong battery life, understanding different degradation mechanisms in state-of-the-art LIBs is essential. Here, we analyze how operational temperature state-of-charge (SoC) range cycling influence ageing automotive grade 21700 batteries, extracted from Tesla 3 long Range 2018 pack with positive electrode containing LiNi x Co y Al z O 2 (NCA) negative SiO...

Li/graphite coin cells containing different amounts of vinylene carbonate (VC) electrolyte additive were examined at temperatures using the High Precision Charger Dalhousie University. The charge endpoint capacities as well coulombic efficiency (CE) compared to characterize effect VC on graphite electrode. experiments show that improves and reduces discharge slippage 50 60°C. However, addition has little evident performance electrode 30 40°C also increases irreversible capacity. By contrast,...

non-destructive techniques to study large prismatic cells, thereby presenting extensive

An important step toward safer and more reliable lithium-ion battery systems is the improvement of methods for detection characterization degradation. In this work, we develop track aging indicators over life 18650-format batteries with a blended NMC532-LMO positive electrode graphite negative electrode. Cells are cycled until reaching 80% their original capacity under combinations four cycling conditions: ambient sub-ambient temperatures (29 °C 10 °C) fast mild rates (2.7 1.0C). Loss...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE ELECTRICAL CONDUCTIVITY AND VISCOSITY OF CONCENTRATED SOLUTIONS ORTHOPHOSPHORIC ACID.Alexander Smith and Alan W. C. MenziesCite this: J. Am. Chem. Soc. 1909, 31, 11, 1191–1194Publication Date (Print):November 1, 1909Publication History Published online1 May 2002Published inissue 1 November 1909https://pubs.acs.org/doi/10.1021/ja01941a002https://doi.org/10.1021/ja01941a002research-articleACS PublicationsRequest reuse permissionsArticle...

During the last decade, market interest for electrified vehicles has increased considerably alongside global climate initiatives. This coincided with vast improvements in automotive-grade, lithium-ion battery performance. range of electric and plug-in hybrids, but lifetime remains a challenge. Aging during fast charging is especially difficult to understand due its nonlinear dependence on charge rate, state-of-charge, temperature. We present results from several energy-optimized, prismatic...

This paper presents a complete design and implementation of the software hardware system for Formula Society Automatic Engineers (FSAE) electric vehicle. followed guidelines published by FSAE formula hybrid vehicle rules. A model view controller based architecture was developed to interact with all necessary during steady state dynamic conditions. The includes main processing unit “main brain,” tractive control board, dashboard, shutdown circuit, related safety features. combination...

An important step toward safer and more reliable lithium-ion battery systems is the development of better methods for detection characterization degradation. For a method to be suitable online application (e.g., onboard an electric vehicle), it must simple, explanatory, non-invasive. In this work, we develop track aging indicators over life 18650-format batteries with blended NMC532-LMO positive electrode graphite negative electrode. Cells are cycled until reaching 80 % their original...

Lithium ion batteries (LIB) have become a cornerstone of the shift to electric transportation. In an attempt decrease production load and prolong battery life, understanding different degradation mechanisms in state-of-the-art LIBs is essential. Here, we analyze how operational temperature state-of-charge (SoC) range cycling influence ageing automotive grade 21700 batteries, extracted from Tesla 3 Long Range 2018 pack with positive electrode containing LiNixCoyAlzO2 (NCA) negative SiOx-C....

In this study, Synchrotron X-ray diffraction (XRD) radiography was utilized to investigate the ageing heterogeneity in 48 Ah prismatic lithium-ion cells with Ni-rich LiNi0.8Mn0.1Co0.1O2 (NMC811) as positive electrode active material and a graphite negative after ~2800 cycles. The study revealed that area closest tab is most vulnerable degradation, particularly impacting NMC material. Application of principal component analysis allowed differentiate visualize part has different degradation...

Ni-rich oxide cathode active materials are today key components in Li-ion batteries used for electric vehicles (EV). The high capacity of LiNi x Co y Mn z O 2 and Al (NCA) with x≥0.6 has enabled a continued increase energy density decrease cost at the pack level, enabling rapid growth EV market recent years. Despite wide use, rather fast material ageing results being source considerable environmental impact [1]. Various degradation sources highlighted literature, these include transition...

The energy density and lifetime of lithium-ion cells for automotive applications have both substantially improved in recent years. This enables electric vehicles the consumer commercial sectors that greater range, better reliability, longer service lives [1]. These factors all contribute to widespread adoption vehicles. However, inhomogeneities exist within uneven internal degradation and, when severe, can trigger rapid failure. be related manufacturing tolerances or distributions component...

The last decade has seen an enormous improvement of energy density for lithium-ion battery cells, particularly automotive grade cells intended use in electrified vehicles. This led to vastly improved range electric vehicles as well plug-in hybrids. However, the challenge uncertain lifetime remains. ageing effect due fast charging is especially difficult predict its non-linear dependence on charge rate, state-of-charge and temperature. We here present results from (1C 3C a 20 % 80 SOC-level)...

Ni-rich Li[Ni x Co y Al z ]O 2 (NCA) positive electrode materials are today found in the state-of-the-art high-energy Li-ion batteries [1]. Considering high production cost of these combined with scarcity and environmental impact included transition metals, large benefits would be gained by prolonging lifetime cells. Although NCAs key to a energy density, they generally believed main culprit behind failure cell [2]. The subjected adverse structural phase transformation display increased...