Zhao, B;
Hao, H;
Lei, H;
Yang, J;
Tang, L;
Shi, X;
Li, W;
... He, G; + view all
(2024)
An anti-freezing pure inorganic electrolyte for long cycle life aqueous sodium-ion batteries at -40 °C.
Energy Storage Materials
, 71
, Article 103562. 10.1016/j.ensm.2024.103562.
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Abstract
Aqueous electrolytes have the great application potential for sodium-ion batteries owing to eco-friendliness, high-safety, and low cost. However, the high freezing point of common aqueous electrolytes greatly limits the normal operation of aqueous sodium-ion batteries (ASIBs) at low temperatures. Herein, MnCl2·4H2O is introduced into NaCl solution to form the hybrid NaCl/MnCl2·4H2O electrolyte to expand the application scope of ASIBs. Due to the strong interaction between Mn2+ and water molecules, the hydrogen bond network in water is damaged on a large scale. Thus, the hybrid electrolyte maintains a liquid state and has a high ionic conductivity (2.44 mS cm−1) at -50 °C. When used the optimized hybrid inorganic electrolyte, the pure inorganic compositions full battery assembled with Na2CoFe(CN)6 cathode and active carbon anode delivers a high specific capacity of 54.0 mAh g−1 at -40 °C under 1 C (1 C = 150 mA g−1). Excitingly, when tested at -40 °C under 10 C, the battery can achieve an ultra-long cycle stability of 10,000 cycles with a capacity retention of ∼ 99 %. Significantly, this work opens a new path to explore the ASIBs with superior electrochemical performance at low temperatures.
| Type: | Article |
|---|---|
| Title: | An anti-freezing pure inorganic electrolyte for long cycle life aqueous sodium-ion batteries at -40 °C |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.ensm.2024.103562 |
| Publisher version: | http://dx.doi.org/10.1016/j.ensm.2024.103562 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Aqueous sodium-ion batteries, Low-temperature, Manganese chloride tetrahydrate, Pure inorganic electrolyte |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10196122 |
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