Ternary Electrolyte Enables High-Voltage and High-Temperature Na-Ion Batteries,ACS Energy Letters

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Ternary Electrolyte Enables High-Voltage and High-Temperature Na-Ion Batteries
ACS Energy Letters ( IF 19.3 ) Pub Date : 2024-09-03 , DOI: 10.1021/acsenergylett.4c01560
Mengying Ma ₁ , Binbin Chen _{1,

2,

3} , Yuan Tu ₁ , Huilin Pan _{1,

4}

Affiliation

Extending the voltage and temperature range for Na-ion batteries (NIBs) is crucial for enhancing energy densities and practical applications. Stabilizing electrode–electrolyte interphases under extreme conditions is challenging. Here, we present a high-performance electrolyte with delicate regulation of ternary solvent–solvent interactions, which augments the chemical and electrochemical stability of the electrolyte. The competition of solvation forces and solvent–solvent interactions in the ternary electrolyte promotes Na⁺ transport and leads to robust interphases. Compared to the conventional carbonate electrolyte, the ternary electrolyte effectively hinders structural phase transitions and transition metal dissolution in the layered oxide cathode. This enables oxide cathodes to perform under 4.2 V with 99.95% Coulombic efficiency for 1000 cycles and stable operation from −35 to 80 °C. Ah pouch cells demonstrate good cycling stability under various temperatures. This work provides valuable insights for developing high-performance NIB electrolytes without increasing costs or sacrificing kinetics.

中文翻译：

三元电解质可实现高压和高温钠离子电池

扩大钠离子电池（NIB）的电压和温度范围对于提高能量密度和实际应用至关重要。在极端条件下稳定电极-电解质界面具有挑战性。在这里，我们提出了一种高性能电解质，可以对三元溶剂-溶剂相互作用进行精细调节，从而增强电解质的化学和电化学稳定性。三元电解质中溶剂化力的竞争和溶剂-溶剂相互作用促进了Na ^{+ 的}传输并导致强大的界面。与传统的碳酸盐电解质相比，三元电解质有效地阻碍了层状氧化物正极中的结构相变和过渡金属溶解。这使得氧化物阴极能够在 4.2 V 电压下运行 1000 个循环，库仑效率为 99.95%，并在 -35 至 80 °C 范围内稳定运行。 Ah 软包电池在不同温度下表现出良好的循环稳定性。这项工作为开发高性能 NIB 电解质提供了宝贵的见解，而无需增加成本或牺牲动力学。

更新日期：2024-09-03

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