Achieving Practical High-Energy-Density Lithium-Metal Batteries by a Dual-Anion Regulated Electrolyte,Advanced Materials

当前位置： X-MOL 学术 › Adv. Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Achieving Practical High-Energy-Density Lithium-Metal Batteries by a Dual-Anion Regulated Electrolyte
Advanced Materials ( IF 27.4 ) Pub Date : 2023-04-07 , DOI: 10.1002/adma.202301171
Hai Su ₁ , Zifeng Chen ₁ , Mengjie Li ₁ , Panxing Bai ₁ , Yong Li ₂ , Xiao Ji ₃ , Ziqiang Liu ₄ , Jie Sun ₅ , Jia Ding ₁ , Ming Yang ₆ , Xiayin Yao ₄ , Chong Mao ₇ , Yunhua Xu ₁

Affiliation

Lithium-metal batteries (LMBs) using lithium-metal anodes and high-voltage cathodes have been deemed as one of the most promising high-energy-density battery technology. However, its practical application is largely hindered by the notorious dendrite growth of lithium-metal anodes, the fast structure degradation of the cathode, and insufficient electrode–electrolyte interphase kinetics. Here, a dual-anion regulated electrolyte is developed for LMBs using lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) and lithium difluoro(bisoxalato)phosphate (LiDFBOP) as anion regulators. The incorporation of TFSI⁻ in the solvation sheath reduces the desolvation energy of Li⁺, and DFBOP⁻ promotes the formation of highly ion-conductive and sustainable inorganic-rich interphases on the electrodes. Significantly enhanced performance is demonstrated on Li||LiNi_0.83Co_0.11Mn_0.06O₂ pouch cells, with 84.6% capacity retention after 150 cycles in 6.0 Ah pouch cells and an ultrahigh rate capability up to 5 C in 2.0 Ah pouch cells. Furthermore, a pouch cell with an ultralarge capacity of 39.0 Ah is fabricated and achieves an ultrahigh energy density of 521.3 Wh kg⁻¹. The findings provide a facile electrolyte design strategy for promoting the practical utilization of high-energy-density LMBs.

中文翻译：

通过双阴离子调节电解质实现实用的高能量密度锂金属电池

使用锂金属阳极和高压阴极的锂金属电池（LMB）被认为是最有前途的高能量密度电池技术之一。然而，其实际应用在很大程度上受到锂金属阳极臭名昭著的枝晶生长、阴极结构快速降解以及电极-电解质界面动力学不足的阻碍。这里，使用双（三氟甲基磺酰基）亚胺锂（LiTFSI）和二氟（双草酸）磷酸锂（LiDFBOP）作为阴离子调节剂，为LMB开发了双阴离子调节电解质。溶剂化鞘中加入 TFSI ^{-降低了 Li}⁺的去溶剂化能，而 DFBOP ^-促进了电极上高离子传导性和可持续的富含无机界面的形成。_{Li||LiNi 0.83} Co _0.11 Mn _0.06 O ₂软包电池的性能显着增强，在 6.0 Ah 软包电池中循环 150 次后容量保持率为 84.6%，在 2.0 Ah 软包电池中具有高达 5 C 的超高倍率能力。此外，还制造了具有39.0 Ah超大容量的软包电池，并实现了521.3 Wh kg ^-1的超高能量密度。研究结果为促进高能量密度LMB的实际应用提供了一种简便的电解质设计策略。

更新日期：2023-04-07

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南