Solvation Engineering via Fluorosurfactant Additive Toward Boosted Lithium-Ion Thermoelectrochemical Cells  

作　　者：Yinghong Xu Zhiwei Li Langyuan Wu Hui Dou Xiaogang Zhang 

机构地区：[1]Jiangsu Key Laboratory of Electrochemical Energy Storage Technologies,College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,People’s Republic of China

出　　处：《Nano-Micro Letters》2024年第4期253-268,共16页纳微快报（英文版）

基　　金：supported by the Leading Edge Technology of Jiangsu Province (BK20220009, BK20202008);Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)。

摘　　要：Lithium-ion thermoelectrochemical cell(LTEC), featuring simultaneous energy conversion and storage, has emerged as promising candidate for low-grade heat harvesting. However, relatively poor thermosensitivity and heat-to-current behavior limit the application of LTECs using LiPF_6 electrolyte. Introducing additives into bulk electrolyte is a reasonable strategy to solve such problem by modifying the solvation structure of electrolyte ions. In this work, we develop a dual-salt electrolyte with fluorosurfactant(FS) additive to achieve high thermopower and durability of LTECs during the conversion of low-grade heat into electricity. The addition of FS induces a unique Li~+ solvation with the aggregated double anions through a crowded electrolyte environment,resulting in an enhanced mobility kinetics of Li~+ as well as boosted thermoelectrochemical performances. By coupling optimized electrolyte with graphite electrode, a high thermopower of 13.8 mV K^(-1) and a normalized output power density of 3.99 mW m^(–2) K^(–2) as well as an outstanding output energy density of 607.96 J m^(-2) can be obtained.These results demonstrate that the optimization of electrolyte by regulating solvation structure will inject new vitality into the construction of thermoelectrochemical devices with attractive properties.

关 键 词：Solvation engineering FLUOROSURFACTANT Ionic thermoelectric Lithium-ion thermoelectrochemical cell Low-grade heat 

分 类 号：TQ423[化学工程] TM912[电气工程—电力电子与电力传动]