复旦大学王永刚团队开发了工作温度范围从-70至100 °C的钠离子电池。相关研究成果于2022年1月19日发表于国际顶尖学术期刊《德国应用化学》。

钠离子电池（SIBs）作为电网规模储能系统的潜在候选电池之一，需要应对极端天气条件。然而，具有宽工作温度范围的全天候SIBs很少报道。

该文中，研究人员提出了一种宽温度SIBs，它涉及碳包覆的Na4Fe3（PO4）2P2O7(NFPP@C)阴极、铋（Bi）阳极和二聚物基电解质。研究人员证明了溶剂化的Na⁺可以通过合金化反应直接由Bi阳极储存，而无需脱溶剂过程。此外NFPP@C阴极在低温下表现出较高的Na+扩散系数。因此，Bi//NFPP@C电池具有完美的低温性能。即使在70°C下，该电池仍能提供70.19%的室温容量。此外，得益于电解液的高沸点，该电池在高达100°C的高温下也能正常工作。这些令人鼓舞的结果可能会为探索宽温度SIBs提供线索。

附：英文原文

Title: Sodium-ion Battery with a Wide Operation-Temperature Range from −70 to 100 °C

Author: Zhi Li, Yu Zhang, Jianhua Zhang, Yongjie Cao, Jiawei Chen, Haimei Liu, Yonggang Wang

Issue&Volume: 2022-01-19

Abstract: Sodium-ion batteries (SIBs), as one of the potential candidates for grid-scale energy storage systems, are required to tackle extreme weather conditions. However, the all-weather SIBs with a wide operation-temperature range are rarely reported. Herein, we propose a wide-temperature SIB, which involves a carbon-coated Na  4  Fe  3  (PO  4  )  2  P  2  O  7  (NFPP@C) cathode, a Bismuth (Bi) anode, and a diglyme-based electrolyte. We demonstrate that solvated Na  +  can be directly stored by the Bi anode via an alloying reaction without the de-solvent process.  Furthermore, the NFPP@C cathode exhibits a high Na  +  diffusion coefficient at low temperature. As a result, the Bi//NFPP@C battery exhibits perfect low-temperature behavior. Even at 70 °C, this battery still delivers 70.19% of the room-temperature capacity. Furthermore, benefitting from the high boiling point of the electrolyte, this battery also works well at a high temperature up to 100 °C. These encourage results might shed light on the exploration of wide-temperature SIBs.

DOI: 10.1002/anie.202116930

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202116930