Anion-Diluent Pairing for Stable High-Energy Li Metal Batteries

Chunnan Zhu, Chuangchao Sun, Ruhong Li, Suting Weng, Liwu Fan, Xuefeng Wang, Lixin Chen, Malachi Noked, Xiulin Fan

Research output: Contribution to journalArticlepeer-review

155 Scopus citations

Abstract

Rechargeable Li metal batteries (LMBs) have attracted wide attention as promising candidates for the next generation of energy-storage systems. However, limited Coulombic efficiency and unregulated dendrite growth restrict its application. Here, we report a kind of electrolyte by introducing fluorinated aromatic diluents into high-concentration electrolytes (HCEs). Unlike other localized HCEs, the fluorinated aromatic diluents pairing with anions promote the formation of a homogeneous and robust solid-electrolyte interphase (SEI), which endows Li metal with an ultrahigh Coulombic efficiency of ∼99.8%. The Li||LiNi0.8Co0.1Mn0.1O2battery holds a capacity retention of >80% over 260 cycles even with a thin Li anode (20 μm) and a high cathode loading (3.5 mAh cm-2). A 1.8 Ah Li||NMC811 pouch cell with a lean electrolyte delivers an energy density of 340 Wh kg-1and a stable cycling life over 200 cycles. The designed electrolytes, which benefit from the synergetic effects of anions and diluents on the SEI, pave the way for the next-generation LMBs.

Original languageEnglish
Pages (from-to)1338-1347
Number of pages10
JournalACS Energy Letters
Volume7
Issue number4
DOIs
StatePublished - 8 Apr 2022

Bibliographical note

Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.

Funding

This work was supported by the National Natural Science Foundation of China (Nos. 22161142017, 22072134), Natural Science Foundation of Zhejiang Province (No. LZ21B030002), the Fundamental Research Funds for the Zhejiang Provincial Universities (No. 2021XZZX010), the Fundamental Research Funds for the Central Universities (No. 2021FZZX001-09), and “Hundred Talents Program” of Zhejiang University.

FundersFunder number
Fundamental Research Funds for the Zhejiang Provincial Universities2021XZZX010
National Natural Science Foundation of China22161142017, 22072134
Natural Science Foundation of Zhejiang ProvinceLZ21B030002
Zhejiang University
Fundamental Research Funds for the Central Universities2021FZZX001-09

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