1 research outputs found
High-Performance All-Solid-State Polymer Electrolyte with Controllable Conductivity Pathway Formed by Self-Assembly of Reactive Discogen and Immobilized via a Facile Photopolymerization for a Lithium-Ion Battery
All-solid-state polymer electrolytes
(SPEs) have aroused great
interests as one of the most promising alternatives for liquid electrolyte
in the next-generation high-safety, and flexible lithium-ion batteries.
However, some disadvantages of SPEs such as inefficient ion transmission
capacity and poor interface stability result in unsatisfactory cyclic
performance of the assembled batteries. Especially, the solid cell
is hard to be run at room temperature. Herein, a novel and flexible
discotic liquid-crystal (DLC)-based cross-linked solid polymer electrolyte
(DLCCSPE) with controlled ion-conducting channels is fabricated via
a one-pot photopolymerization of oriented reactive discogen, polyÂ(ethylene
glycol)Âdiacrylate, and lithium salt. The experimental results indicate
that the macroscopic alignment of self-assembled columns in the DLCCSPEs
is successfully obtained under annealing and effectively immobilized
via the UV photopolymerization. Because of the existence of unique
oriented structure in the electrolytes, the prepared DLCCSPE films
exhibit higher ionic conductivities and better comprehensive electrochemical
properties than the DLCCSPEs without controlled ion-conductive pathways.
Especially, the assembled LiFePO<sub>4</sub>/Li cells with oriented
electrolyte show an initial discharge capacity of 164 mA h g<sup>–1</sup> at 0.1 C and average specific discharge capacities of 143, 135,
and 149 mA h g<sup>–1</sup> at the C-rates of 0.5, 1, and 0.2
C, respectively. In addition, the solid cell also shows the first
discharge capacity of 124 mA h g<sup>–1</sup> (0.2 C) at room
temperature. The outstanding cell performance of the oriented DLCCSPE
should be originated from the macroscopically oriented and self-assembled
DLC, which can form ion-conducting channels. Thus, combining the excellent
performance of DLCCSPE and the simple one-pot fabricating process
of the DLC-based all-solid-state electrolyte, it is believed that
the DLC-based electrolyte can be one of the most promising electrolyte
materials for the next-generation high-safety solid lithium-ion batteries