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yexuqing木蟲之王 (文學(xué)泰斗)
太陽系系主任
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[交流]
Liquid–liquid interfacial tension stabilized Li-metal batteries
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Liquid–liquid interfacial tension stabilized Li-metal batteries 液-液界面張力穩(wěn)定的鋰金屬電池 ▲ 作者：Haijin Ji, Jingwei Xiang, Yong Li, Mengting Zheng, Lixia Yuan, Yaqi Liao, et al. ▲鏈接： https://www.nature.com/articles/s41586-025-09293-4 ▲摘要： 人們認(rèn)為鋰（Li）金屬陽極與高鎳陰極的組合有望超過500 Wh kg-1的閾值。接近如此高的能量密度時(shí)，能夠穩(wěn)定陽極和陰極界面的電解質(zhì)對(duì)于確保電池的安全性和長(zhǎng)期循環(huán)性至關(guān)重要。盡管陰離子衍生的無機(jī)界面在鋰側(cè)已取得了顯著成效，但開發(fā)同時(shí)保護(hù)兩側(cè)電極的本征策略仍是一個(gè)關(guān)鍵挑戰(zhàn)。 研究組報(bào)告了一種用于電解質(zhì)設(shè)計(jì)的微乳液策略，繞過了Li+溶劑化調(diào)節(jié)，并為兩側(cè)電極生成富氟化物界面相。具體而言，膠束和碳酸鹽溶劑之間的液-液界面張力（而非電場(chǎng)）推動(dòng)氟化液滴向陽極和陰極運(yùn)動(dòng)。通過這種方式，兩側(cè)電極的界面結(jié)構(gòu)得以增強(qiáng)，并將其與溶劑化結(jié)構(gòu)策略解耦。 通過使用微乳液電解質(zhì)，兩種能量密度分別為531 Wh kg-1和547 Wh kg-1的軟包電池在189次和155次循環(huán)后分別保持了81%和79%的容量。液-液界面張力的引入為界面相調(diào)節(jié)和電解質(zhì)設(shè)計(jì)提供了新視角，為高壓鋰金屬電池的發(fā)展奠定了基礎(chǔ)。 ▲ Abstract： A lithium (Li)-metal anode paired with a high-nickel cathode is considered to be a combination that holds promise to surpass the 500?Wh?kg?1 threshold. Approaching such high energy density, electrolytes capable of stabilizing both anode and cathode interphases are of importance to secure safe and long-term cycling. Although anion-derived inorganic interphases have shown remarkable success at the Li side, developing intrinsic strategies to concurrently protect both electrodes remains a key challenge. Here we report a micro-emulsion strategy for electrolyte design that bypasses the Li+ solvation regulation and produces fluoride-rich interphases for both electrodes. Specifically, liquid–liquid interfacial tension between the micelles and carbonate solvents, rather than the electric field, propels the motion of fluorinated droplets towards the anode and the cathode. In this way, the interphase construction of both electrodes can be enhanced and decoupled from the solvation structure strategy. Through use of the micro-emulsion electrolyte, two pouch full cells with energy densities of 531 Wh?kg?1 and 547?Wh?kg?1 retain 81% and 79% of their capacity after 189 and 155 cycles, respectively. The introduction of liquid–liquid interfacial tension provides a perspective for interphase regulation and electrolyte design, and paves the way for the development of high-voltage Li-metal batteries. |
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