Double Network Gel Electrolyte with High Ionic Conductivity and Mechanical Strength for Zinc-Ion Batteries

Zeng, Weikang1; Zhang, Shaobo2,3; Lan, Jiaqi4; Lv, You1; Zhu, Guoqing1; Huang, Haotian1; Lv, Wei4; Zhu, Yuan1

2024-09-01

10.1021/acsnano.4c09879

ACS NANO   影响因子和分区

1936-0851

1936-086X

Gel electrolytes hold promise for stabilizing zinc-ion batteries (ZIBs), but achieving both high ionic conductivity and strong mechanical properties remains challenging. This work presents a double network gel electrolyte based on poly(N-hydroxymethyl acrylamide) (PNMA) and sodium alginate (SA), overcoming this trade-off. The PNMA network provides mechanical strength and water retention, while the SA network facilitates rapid zinc-ion (Zn2+) diffusion through tailored solvation. This double network gel exhibits a tensile strength of up to 838 kPa, significantly higher than previous reports. The SA network provides ion channels for rapid transport of hydrated Zn2+, enhancing the ionic conductivity to a ground-breaking 33.1 mS cm(-1). This value is even higher than the liquid electrolytes. The growth of Zn dendrites is also suppressed due to the mechanical constraint and rapid ion conduction. In symmetrical cells, the PNMA/SA gel demonstrates exceptional cycling stability (>2000 h). Characterizations show this is because of reduced free water amount, hindering cathode material dissolution. The full cells with sodium vanadate cathode manifest a high capacity (364.8 mA h g(-1) at 0.5 A g(-1)) and excellent capacity retention (83% after 2500 cycles at 10 A g(-1)). This double network design offers a way to achieve high-performance and stable ZIBs.

zinc-ion batteries double network gel electrolyte high ionic conductivity high mechanical strength

SCI

英语

第一 ; 通讯

National Science Foundation for Excellent Young Scholars[52122607] ; National Natural Science Foundation of China[U20A20241] ; Shenzhen Stable Support Plan Program for Higher Education Institutions Research Program[20220815110818001] ; Technology Innovation Commission of Shenzhen[JCYJ20210324104608024]

Chemistry ; Science & Technology - Other Topics ; Materials Science

Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:001313748300001

AMER CHEMICAL SOC

Web of Science

1.Southern Univ Sci & Technol, Sch Microelect, Shenzhen 518055, Peoples R China
2.Harbin Inst Technol, Sch Environm, Harbin 150090, Peoples R China
3.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen 518055, Peoples R China
4.Tsinghua Univ, Shenzhen Geim Graphene Ctr, Tsinghua Shenzhen Int Grad Sch, Shenzhen 518055, Peoples R China

Zeng, Weikang,Zhang, Shaobo,Lan, Jiaqi,et al. Double Network Gel Electrolyte with High Ionic Conductivity and Mechanical Strength for Zinc-Ion Batteries[J]. ACS NANO,2024.

Zeng, Weikang.,Zhang, Shaobo.,Lan, Jiaqi.,Lv, You.,Zhu, Guoqing.,...&Zhu, Yuan.(2024).Double Network Gel Electrolyte with High Ionic Conductivity and Mechanical Strength for Zinc-Ion Batteries.ACS NANO.

Zeng, Weikang,et al."Double Network Gel Electrolyte with High Ionic Conductivity and Mechanical Strength for Zinc-Ion Batteries".ACS NANO (2024).