Cho Seok-Kyu, Lee Kyung Min, Kang So-Huei, Jeong Kihun, Han Sun-Phil, Lee Ji Eun, Lee Seungho, Shin Tae Joo, Ryu Ja-Hyoung, Yang Changduk, Kwak Sang Kyu, Lee Sang-Young
Secondary Battery Materials Research Center, Research Institute of Industrial Science and Technology (RIST), 67 Cheongam-ro, Nam-gu, Pohang-si, Gyeongsangbuk-do 37673, Republic of Korea.
Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea.
Sci Adv. 2022 Sep 16;8(37):eabp8751. doi: 10.1126/sciadv.abp8751. Epub 2022 Sep 14.
Single-ion conductors have garnered attention in energy storage systems as a promising alternative to currently widespread electrolytes that allow migration of cations and anions. However, ion transport phenomena of most single-ion conductors are affected by strong ion (e.g., Li)-ion (immobilized anionic domains) interactions and tortuous paths, which pose an obstacle to achieving performance breakthroughs. Here, we present a Li-centered G-quadruplex (LiGQ) as a class of single-ion conductor based on directional Li slippage at the microscopic level. A guanine derivative with liquid crystalline moieties is self-assembled to form a hexagonal ordered columnar structure in the LiGQ, thereby yielding one-dimensional central channels that provide weak ion-dipole interaction and straightforward ionic pathways. The LiGQ exhibits weak Li binding energy and low activation energy for ion conduction, verifying its viability as a new electrolyte design.
单离子导体作为当前广泛使用的允许阳离子和阴离子迁移的电解质的一种有前途的替代品，在储能系统中受到了关注。然而，大多数单离子导体的离子传输现象受到强离子（如Li）-离子（固定化阴离子域）相互作用和曲折路径的影响，这对实现性能突破构成了障碍。在此，我们提出了一种以锂为中心的G-四链体（LiGQ），作为一类基于微观层面定向锂滑移的单离子导体。一种带有液晶部分的鸟嘌呤衍生物在LiGQ中自组装形成六方有序柱状结构，从而产生一维中心通道，提供弱离子-偶极相互作用和直接的离子传导路径。LiGQ表现出较弱的锂结合能和较低的离子传导活化能，验证了其作为新型电解质设计的可行性。
