Gelatinized starch as a low-cost and bifunctional binder enables shuttle-free aqueous zinc-iodine batteries  

作　　者：Zheng-Tai Yu Zong-Shuai Gong Rui-Hang Wen Ya-Jun Hou Zhi-Qiang Luo Zhi-Hao Yuan Ning Zhang 

机构地区：[1]School of Materials Science and Engineering,Tianjin University of Technology,Tianjin,300384,China [2]College of Chemistry and Materials Science,Key Laboratory of Analytical Science and Technology of Hebei Province,Institute of Life Science and Green Development,Hebei University,Baoding,071002,China

出　　处：《Rare Metals》2024年第12期6351-6361,共11页稀有金属(英文版)

基　　金：financially supported by the National Natural Science Foundation of China(Nos.22379038 and 22075067);the Natural Science Foundation of Tianjin City(No.23JCYBJC00330);the Science Research Project of Hebei Education Department(No.JZX2024015);the Young Elite Scientists Sponsorship Program by CAST(No.2021QNRC001);Shijiazhuang Science and Technology Plan Project(No.241791357A);the Excellent Youth Research Innovation Team of Hebei University(No.QNTD202410)。

摘　　要：Rechargeable aqueous zinc-iodine(Zn-I_(2))batteries are widely regarded as a promising contender for energy-storage devices,due to their intrinsic safety,low cost,and high capacity.However,the severe shuttle effect of polyiodides and the large volume change of I_(2)cathode induce severe capacity loss and poor electrochemical reversibility,hindering their commercial applications.Herein,we report that the low-cost gelatinized starch(Gstarch)can be used as a bifunctional binder for Zn-I_(2)batteries to circumvent the above problems simultaneously.Based on both calculation and experimental data,it is demonstrated that the double-helix structure of G-starch with bothα-1,4-andα-1,6-glycosidic bonds can strongly interact with polyiodides to suppress the shuttle effect.Moreover,the G-starch with multiple hydrogen-bonded cross-linking networks exhibits a much-enhanced adhesion ability and can buffer the volume expansion of active materials.In contrast,the traditional carboxymethyl cellulose sodium-based aqueous binder lacks these capabilities.As a result,the G-starch binder enables the aqueous Zn-I_(2)battery to achieve a high reversible capacity of212.4 mAh·g^(-1)at 0.2 A·g^(-1)after 1000 cycles and ultralong-cycling life over 48,000 cycles with 135.4 mAh·g^(-1)and 89.6%capacity retention at 2 A·g^(-1).This work develops a simple yet efficient strategy to construct highperformance Zn-I_(2)batteries.

关 键 词：Zn-I_(2)batteries Gelatinized starch BINDER Shuttle effect Aqueous Zn metal batteries 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ430.7[化学工程]