Abstract
Solid-state batteries are an emerging option for next-generation traction batteries because they are safe and have a high energy density. Accordingly, in polymer research, one of the main goals is to achieve solid polymer electrolytes (SPEs) that could be facilely fabricated into any preferred size of thin films with high ionic conductivity as well as favorable mechanical properties. In particular, in the past two decades, many polymer materials of various structures have been applied to improve the performance of SPEs. In this review, the influences of polymer architecture on the physical and electrochemical properties of an SPE in lithium solid polymer batteries are systematically summarized. The discussion mainly focuses on four principal categories: linear, comb-like, hyper-branched, and crosslinked polymers, which have been widely reported in recent investigations as capable of optimizing the balance between mechanical resistance, ionic conductivity, and electrochemical stability. This paper presents new insights into the design and exploration of novel high-performance SPEs for lithium solid polymer batteries.
Highlights
As a major portable power source, lithium-ion batteries (LIBs) are widely used in consumer electronics as well as electric vehicles (EVs)
The appearance of gelled polymer electrolytes (GPEs), in which liquid solvent is immobilized in a polymer matrix [7], can reduce the risk of leakage, but not the flammability
As a result of the polymer’s unique morphology, the solid polymer electrolytes (SPEs) that contain lithium bis(pentafluoroethanesulfonyl)imide salts exhibit high ionic conductivities, i.e., 10−4 S·cm−1 at 30 ◦ C and 10−5 S cm−1 at 5 ◦ C with ethylene oxide (EO)/Li+ = 33/1. Another star-shaped copolymer based on PS and poly(poly(ethylene glycol) methyl ether methacrylate) (PPEGMA) is synthesized by atom transfer radical polymerization [82]
Summary
As a major portable power source, lithium-ion batteries (LIBs) are widely used in consumer electronics as well as electric vehicles (EVs). Compared with conventional lithium-ion batteries with a liquid electrolyte, using SPEs can enhance the energy density and safety of batteries [10,11]. In the 1980s, an exploration period for SPEs, the investigations were focused on ion transport mechanism and ionic conductivity enhancement as well as the production of lithium secondary batteries. The first candidates such power sources areenergy all solid-state batteriesto(ASSLPBs) This is because exhibit balancedfor characteristics of safety, density, lithium polymer batteries (ASSLPBs). Fourlinear, principal categories, which have been widely elaborated inview recent the various ion transport mechanisms, the discussion centers on two types of electrolytes: PEO-based investigations, are examined: linear, comb-like, hyper-branched, and crosslinked polymers.
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