Reconfiguring Sodium Intercalation Process of TiS2 Electrode for Sodium-Ion Batteries by a Partial Solvent Cointercalation,ACS Energy Letters

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Reconfiguring Sodium Intercalation Process of TiS2 Electrode for Sodium-Ion Batteries by a Partial Solvent Cointercalation
ACS Energy Letters ( IF 19.3 ) Pub Date : 2022-10-04 , DOI: 10.1021/acsenergylett.2c01838
Jooha Park ₁ , Sung Joo Kim ₁ , Kyungmi Lim ₁ , Jiung Cho ₂ , Kisuk Kang _{1,

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4,

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Affiliation

Titanium disulfide (TiS₂), a first-generation cathode in lithium batteries, has also attracted a broad interest as a sodium-ion battery electrode due to fast sodium intercalation kinetics and large theoretical capacity. However, the reversibility of sodium de/intercalation is far inferior to that of lithium because of the unfavorable intermediate phase formation. Herein, we demonstrate that reconfiguring sodium intercalation via partial solvent cointercalation alters the phase-transition paths for the entire reactions of Na_xTiS₂ (0 < x < 1), detouring the formation of the unfavorable intermediates. Additionally, it unexpectedly results in a remarkable enhancement of sodium intercalation reversibility, boosting the cycle stability (1000 cycles) accompanying high power capability (10C rate). Comparative investigations reveal that the sodium intercalation in ether-based electrolyte involves a preintercalation of solvent molecules, which is subsequently dissimilar to the bare sodium intercalation in conventional electrolytes. Rediscovery of the intercalation behavior of TiS₂ offers a new insight in revisiting the reversibility and kinetics of the commonly known electrodes for batteries.

中文翻译：

钠离子电池TiS2电极部分溶剂共插钠工艺重构

二硫化钛（TiS ₂）是锂电池中的第一代正极，由于钠嵌入动力学快和理论容量大，作为钠离子电池电极也引起了广泛的兴趣。然而，由于不利的中间相形成，钠脱嵌/嵌入的可逆性远不如锂。在此，我们证明通过部分溶剂共插层重新配置钠插层会改变 Na _x TiS ₂整个反应的相变路径（0 < x< 1)、绕道形成不利的中间体。此外，它出人意料地导致钠嵌入可逆性的显着增强，提高了循环稳定性（1000 次循环）以及高功率能力（10C 速率）。比较研究表明，醚基电解质中的钠嵌入涉及溶剂分子的预嵌入，这与传统电解质中的裸钠嵌入不同。_{重新发现 TiS 2}的嵌入行为为重新审视众所周知的电池电极的可逆性和动力学提供了新的见解。

更新日期：2022-10-04

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