4 research outputs found
Review—Use of impedance spectroscopy for the estimation of Li-ion battery state of charge, state of health and internal temperature
The rapid adoption of electric vehicles (EVs) and the evolving needs of portable electronic devices has intensified the need for enhanced state diagnosis of Li-ion batteries (LIBs). As the applications for LIBs continue to grow, so too does their operational requirements; ranging from faster charging and improved safety to optimized energy control and extended lifespan. In order to keep pace with the growing requirements of LIBs, improvements in the monitoring of battery states must be achieved. Although electrochemical impedance spectroscopy (EIS) has existed since the 1960's, its potential as a diagnosis tool has only received widespread attention in recent years. In this paper, a detailed review on the applicability of impedance measurements for the estimation of the vital battery parameters of state of charge (SOC), state of health (SOH) and internal temperature (IT) has been performed
Curious Case of Positive Current Collectors: Corrosion and Passivation at High Temperature
In
the evaluation of compatibility of different components of cell
for high-energy and extreme-conditions applications, the highly focused
are positive and negative electrodes and their interaction with electrolyte.
However, for high-temperature application, the other components are
also of significant influence and contribute toward the total health
of battery. In present study, we have investigated the behavior of
aluminum, the most common current collector for positive electrode
materials for its electrochemical and temperature stability. For electrochemical
stability, different electrolytes, organic and room temperature ionic
liquids with varying Li salts (LiTFSI, LiFSI), are investigated. The
combination of electrochemical and spectroscopic investigations reflects
the varying mechanism of passivation at room and high temperature,
as different compositions of decomposed complexes are found at the
surface of metals
Ionic Liquid–Organic Carbonate Electrolyte Blends To Stabilize Silicon Electrodes for Extending Lithium Ion Battery Operability to 100 °C
Fabrication
of lithium-ion batteries that operate from room temperature to elevated
temperatures entails development and subsequent identification of
electrolytes and electrodes. Room temperature ionic liquids (RTILs)
can address the thermal stability issues, but their poor ionic conductivity
at room temperature and compatibility with traditional graphite anodes
limit their practical application. To address these challenges, we
evaluated novel high energy density three-dimensional nano-silicon
electrodes paired with 1-methyl-1-propylpiperidinium bisÂ(trifluoromethanesulfonyl)Âimide
(Pip) ionic liquid/propylene carbonate (PC)/LiTFSI electrolytes. We
observed that addition of PC had no detrimental effects on the thermal
stability and flammability of the reported electrolytes, while largely
improving the transport properties at lower temperatures. Detailed
investigation of the electrochemical properties of silicon half-cells
as a function of PC content, temperature, and current rates reveal
that capacity increases with PC content and temperature and decreases
with increased current rates. For example, addition of 20% PC led
to a drastic improvement in capacity as observed for the Si electrodes
at 25 °C, with stability over 100 charge/discharge cycles. At
100 °C, the capacity further increases by 3–4 times to
0.52 mA h cm<sup>–2</sup> (2230 mA h g<sup>–1</sup>)
with minimal loss during cycling
Three-Dimensionally Engineered Porous Silicon Electrodes for Li Ion Batteries
The ultimate goal of Li ion battery design should consist
of fully
accessible metallic current collectors, possibly of nanoscale dimensions,
intimately in contact with high capacity stable electrode materials.
Here we engineer three-dimensional porous nickel based current collector
coated conformally with layers of silicon, which typically suffers
from poor cycle life, to form high-capacity electrodes. These binder/conductive
additive free silicon electrodes show excellent electrode adhesion
resulting in superior cyclic stability and rate capability. The nickel
current collector design also allows for an increase in silicon loading
per unit area leading to high areal discharge capacities of up to
0.8 mAh/cm<sup>2</sup> without significant loss in rate capability.
An excellent electrode utilization (∼85%) and improved cyclic
stability for the metal/silicon system is attributed to reduced internal
stresses/fracture upon electrode expansion during cycling and shorter
ionic/electronic diffusion pathways that help in improving the rate
capability of thicker silicon layers