Poly(lithium 4-styrene sulfonate)-based self-doped solid polymer electrolytes were prepared by radical polymerization and ion-exchange reactions of sodium 4-styrene sulfonate and oligo(ethylene oxide) methyl ether methacrylate. The crystalline melting temperature of ethylene oxide was reduced by increasing the lithium-ion concentration, which resulted in a reduction in the size of the crystalline domains due to the improved coordination between lithium ions and oxygen. Alternating current (AC) impedance measurements showed that the ionic conductivity was 15 times higher after the introduction of boron trifluoride-tetrahydrofuran (BF₃-THF), and up to 1.22×10⁻⁵ S cm⁻¹ was achieved at 25 °C in all the solid-state self-doped polymer electrolytes. Furthermore, although some oxidation current was observed due to the reaction with lithium metal after the addition of BF₃-THF, electrochemical stability up to 4.5 V was obtained. For the same reason, the lithium-ion transference number decreased from 0.9 to 0.59 after the addition of BF₃-THF. However, since the anion is immobilized in the polymer chain, it can be expected as a single-ion conductor regardless of the addition of BF₃-THF.

通过4-苯乙烯磺酸钠与低聚环氧乙烷甲基醚甲基丙烯酸酯的自由基聚合和离子交换反应，制备了聚（4-苯乙烯磺酸锂）基自掺杂固体聚合物电解质。通过增加锂离子的浓度降低了环氧乙烷的晶体熔化温度，由于改善了锂离子和氧之间的配位，导致了晶畴尺寸的减小。交流阻抗测量表明，引入三氟化硼-四氢呋喃（BF ₃ -THF）后，离子电导率提高了15倍，最高可达1.22×10 ^-5  S cm ^-1在所有固态自掺杂聚合物电解质中，均在25°C时获得了Δε。此外，尽管在添加BF ₃ -THF后由于与锂金属反应而观察到一些氧化电流，但是获得了高达4.5V的电化学稳定性。由于相同的原因，在添加BF ₃ -THF后，锂离子转移数从0.9降低至0.59 。但是，由于阴离子被固定在聚合物链中，因此与BF ₃ -THF的添加无关，可以期待作为单离子导体。