2 research outputs found
Reshaping Lithium Plating/Stripping Behavior via Bifunctional Polymer Electrolyte for Room-Temperature Solid Li Metal Batteries
High-energy rechargeable
Li metal batteries are hindered by dendrite
growth due to the use of a liquid electrolyte. Solid polymer electrolytes,
as promising candidates to solve the above issue, are expected to
own high Li ion conductivity without sacrificing mechanical strength,
which is still a big challenge to realize. In this study, a bifunctional
solid polymer electrolyte exactly having these two merits is proposed
with an interpenetrating network of polyÂ(ether–acrylate) (ipn-PEA)
and realized via photopolymerization of ion-conductive polyÂ(ethylene
oxide) and branched acrylate. The ipn-PEA electrolyte with facile
processing capability integrates high mechanical strength (ca. 12
GPa) with high room-temperature ionic conductance (0.22 mS cm<sup>–1</sup>), and significantly promotes uniform Li plating/stripping.
Li metal full cells assembled with ipn-PEA electrolyte and cathodes
within 4.5 V vs Li<sup>+</sup>/Li operate effectively at a rate of
5 C and cycle stably at a rate of 1 C at room temperature. Because
of its fabrication simplicity and compelling characteristics, the
bifunctional ipn-PEA electrolyte reshapes the feasibility of room-temperature
solid-state Li metal batteries
Lithium-Ion Batteries: Charged by Triboelectric Nanogenerators with Pulsed Output Based on the Enhanced Cycling Stability
The triboelectric
nanogenerator (TENG) has been used to store its generated energy into
lithium-ion batteries (LIBs); however, the influences of its pulse
current and high voltage on LIB polarization and dynamic behaviors
have not been investigated yet. In this paper, it is found that LIBs
based on the phase transition reaction of the lithium storage mechanism
[LiFePO<sub>4</sub> (LFP) and Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> (LTO) electrodes] are more suitable for charging by TENGs. Thus,
the enhanced cycling capacity, Coulombic efficiency (nearly 100% for
LTO electrode), and energy storage efficiency (85.3% for the LFP–LTO
electrode) are successfully achieved. Moreover, the pulse current
has a positive effect on the increase of the Li-ion extraction, reducing
the charge-transfer resistance (<i>R</i><sub>ct</sub>) for
all studied electrodes as well (LFP, LiNi<sub>0.6</sub>Co<sub>0.2</sub>Mn<sub>0.2</sub>O<sub>2</sub>, LTO, and graphite). The excellent
cyclability, high Coulombic, and energy storage efficiencies demonstrated
the availability of storing pulsed energy generated by TENGs. This
research has provided a promising analysis to obtain an enhanced charging
methodology, which provides significant guidance for the scientific
research of the LIBs