A solubility-limited, non-protonic polar small molecule co-solvent reveals additive selection in inorganic zinc salts

Zhang，Tianyun1,2,3; Yang，Jiachao4; Wang，Han2; Yu，Huaming2; Li，Quanyu2; Chen，Li Bao2; Chen，Yuejiao1,2; Wang，Taihong1

2024-02-01

10.1016/j.ensm.2023.103085

Energy Storage Materials   影响因子和分区

2405-8297

Organic additives, like ester organic molecules, are greatly compatible with aqueous electrolyte with organic zinc salts, thus playing an enhanced role in electrochemical performance. However, due to poor compatibility, some organic molecules have never been attempted in low-cost inorganic zinc salt electrolytes for zinc ion batteries. Herein, for the first time, according to the limited intercalation of an non-protonic polar small molecule trimethyl phosphate (TMP) in ZnSO electrolytes, the regularity of additive selection based on inorganic zinc salts is revealed in depth. Generally, by adding a small percentage, TMP can interact with Zn to modify the solvated structure, while getting preferentially adsorbed on the anode surface to reshape the water-rich electric double layer (EDL). Thereby, a stable electrode/molecule/solution hydrophobic interface is formed, effectively promoting desolvation and reduction process of Zn. The TMP additive achieve ultra-long lifespan in symmetrical cells with a 24-fold improvement increase for dendrite-free Zn plating/exfoliation (over 2000 h at 1 mA cm and 1 mAh cm), enabling Zn//VO full cell to achieve 3500 cycles with high capacity retention (71.4 %). This novel strategy reaffirms the importance of inorganic zinc salts in additive strategies, thus opening up new ways for designing stable and long-lived zinc anodes.

In-situ protective layer Inorganic zinc salt electrolyte additives Modified electric double layer Trimethyl phosphate Zinc metal anode

SCI

英语

第一 ; 通讯

2-s2.0-85183581571

Scopus

1.Department of Electrical and Electronic Engineering,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
2.State Key Laboratory of Powder Metallurgy,Central South University,Changsha,410083,China
3.Division of Nanomaterials & Chemistry,Hefei National Laboratory for Physical Sciences at the Microscale,University of Science and Technology of China,Hefei,230026,China
4.School of Metallurgy and Environment,Central South University,Changsha,410083,China

Zhang，Tianyun,Yang，Jiachao,Wang，Han,et al. A solubility-limited, non-protonic polar small molecule co-solvent reveals additive selection in inorganic zinc salts[J]. Energy Storage Materials,2024,65.

Zhang，Tianyun.,Yang，Jiachao.,Wang，Han.,Yu，Huaming.,Li，Quanyu.,...&Wang，Taihong.(2024).A solubility-limited, non-protonic polar small molecule co-solvent reveals additive selection in inorganic zinc salts.Energy Storage Materials,65.

Zhang，Tianyun,et al."A solubility-limited, non-protonic polar small molecule co-solvent reveals additive selection in inorganic zinc salts".Energy Storage Materials 65(2024).