Jiangyan Xue

Suzhou Institute of Nano-tech and Nano-bionics

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Lingwang Liu

University of Science and Technology of China

Xiaodong Wu

Suzhou Institute of Nano-tech and Nano-bionics

Jingjing Xu

Guangzhou University

Shixiao Weng

Hohai University

Yang Liu

University of Science and Technology of China

Guochao Sun

Sichuan Agricultural University

Hong Li

Institute of Physics

Can Qian

Tianmu Lake Institute of Advanced Energy Storage Technologies (China)

Suwan Lu

Suzhou Institute of Nano-tech and Nano-bionics

Yiwen Gao

Shanghai University

Cooperative Institutions

Chinese Academy of Sciences

University of Science and Technology of China

Suzhou Institute of Nano-tech and Nano-bionics

Shanghai University

Tianmu Lake Institute of Advanced Energy Storage Technologies (China)

Institute of Physics

Fudan University

Changshu Institute of Technology

Dalian University of Technology

Hohai University

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A Highly Ion‐Conductive Solid Polymer Electrolyte with Good Thermal Stability and Nonflammability for All‐Solid‐State Li Metal Batteries

Energy Technology (2023)

Yang Liu Lei Wang Lingwang Liu Jiangyan Xue Haiyang Zhang

Lithium metal batteries (LMBs) have been recognized as one of the most promising energy storage devices due to their high energy density. The leakage, corrosion to Li metal anode, and flammability of organic liquid electrolytes bring great security problems for LMBs. Polymeric ionic liquid (PIL)‐based solid polymer electrolytes (SPE), possessing nonflammability, excellent thermal, chemical, electrochemical stability, are a kind of promising SPE for highly safe all‐solid‐state LMBs. Nevertheless, the low ambient conductivity of pristine PIL‐based SPE restricts their application in solid‐state LMBs. Herein, an ionic liquid monomer (denoted as GIM) is designed and synthesized and copolymerized with vinyl ethylene carbonate (VEC) monomer by UV‐light curing to prepare P(GIM‐VEC) SPE. The prepared P(GIM‐VEC) SPE is thermally stable and intrinsically nonflammable, possesses high ambient ionic conductivity, and can suppress lithium dendrite growth and stabilize the solid electrolyte interface. Thus, the resultant all‐solid‐state LiFePO 4 (LFP)|P(GIM‐VEC)|Li battery exhibits a high initial discharge capacity of 152.7 mAh g −1 at 0.1 C along with a good stability and rate capability at room temperature. Herein, new guidance is provided for developing ambient workable SPEs with high ionic conductivity, nonflammability, and excellent thermal stability for all‐solid‐state Li metal batteries.

Thermal Stability

Fast ion conductor

Electrochemical window

10.1002/ente.202201312

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Citations (4)

Interphase‐Regulated Room‐Temperature Sodium‐Sulfur Batteries Enabled by a Nonflammable Dual‐Functional Electrolyte

Advanced Energy Materials (2024)

Yang Liu Suwan Lu Shixiao Weng Jingjing Xu Haifeng Tu

Abstract Room temperature sodium‐sulfur (RT Na‐S) batteries have attracted significant attention due to their abundant material reserves, low cost, and high theoretical specific capacity. However, the inherent problems of electrodes and complex interfacial reactions hinder the practical applications. In this study, a nonflammable dual‐functional ionic liquid‐based electrolyte is developed, which can form an inorganic‐rich solid electrolyte interphase on the surface of sodium‐metal anode, effectively improving the sodium deposition behavior and inhibiting dendrite growth. Meanwhile, the unique synergistic effect of FSI − /TFSI − and fluoroethylene carbonate (FEC) in nucleophilic substitution with sodium polysulfides are harnessed to modulate a solid‐solid (S 8 ‐Na 2 S) transition, resulting in the formation of a stable cathode electrolyte interphase (CEI) enhanced with NaF spheres. Consequently, the generation of polysulfides and interfacial side reactions are effectively suppressed by the solid‐solid transition mechanism under CEI protection. Therefore, by optimizing the multi‐component electrolyte, the S@C||Na cell exhibits high capacity, extends lifespan, exceptional rate performance, and enhances safety, showing a specific capacity of 565 mAh g −1 after 500 cycles at 0.2 A g −1 . The utilization of this novel electrolyte holds great potential in RT Na‐S batteries, enabling enhanced electrochemical performance and safety.

Interphase

10.1002/aenm.202404890

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Design towards recyclable micron-sized Na2S cathode with self-refinement mechanism

Nature Communications (2024)

Suwan Lu Yang Liu Jingjing Xu Shixiao Weng Jiangyan Xue

Sodium sulfide (Na2S) as an initial cathode material in room-temperature sodium-sulfur batteries is conducive to get rid of the dependence on Na-metal anode. However, the micron-sized Na2S that accords with the practical requirements is obstructed due to poor kinetics and severe shuttle effect. Herein, a subtle strategy is proposed via regulating Na2S redeposition behaviours. By the synergistic effect from both conductive structure and cuprous sulfide (Cu2S) catalysis, the micron-sized Na2S particles are broken down and redeposited to nano-size during the initial cycle which can be fully utilized in subsequent cycles. Consequently, the Na2S/CPVP@Cu2S||Na cell delivers excellent cyclability (670 mAh gS−1 after 500 cycles) with a remarkable average Coulombic efficiency over 99.7% and rate capability (480 mAh gS−1 at 4 A gS−1). Besides, the Na-free anodes are used to prove the application prospects. This work provides an innovative idea for utilizing micron-sized Na2S and offers insights into its conversion pathway. Authors report that micron-sized Na2S particles can be self-refinement into nanoparticles during the initial cycle under rapid solid-liquid-solid conversion, which facilitates the development of Na-free anode systems in room-temperature sodium-sulfur batteries.

Sodium sulfide

10.1038/s41467-024-54316-9

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Interfacial Kinetics Regulation of MoS₂/Cu₂Se Nanosheets toward Superior High‐Rate and Ultralong‐Lifespan Sodium‐Ion Half/Full Batteries

ChemSusChem (2021)

Bo Wang Jiangyan Xue Feilong Li Hongbo Geng Jian‐Ping Lang

Sodium-ion batteries (SIBs) have aroused great attention because of the low cost and environmental benignity of sodium resources. However, practical applications of SIBs are plagued by the sluggish kinetics of sodium ions with large size in the host structure, which results in poor rate performance and rapid capacity decline. Herein, a self-templated approach was developed to synthesize MoS2 /Cu2 Se nanosheets with improved interfacial electron- and ion-transfer kinetics. The MoS2 /Cu2 Se nanosheets provided superior sodium storage performance, delivering 139 mAh g-1 at a high current density of 100 A g-1 and 222 mAh g-1 after 14000 cycles (at 20 A g-1 ). The outstanding electrochemical performance was attributed to the synergetic engineering of interface and structure, which could enhance the electrochemical kinetics and gave excellent mechanical properties to deal with the volume expansion phenomenon. Combined with a high-voltage cathode, the full battery demonstrated a high energy density of 152 Wh kg-1 at a power density of 420 W kg-1 , which opens a new avenue for the development of high-performance SIBs.

Electrochemical kinetics

Sodium-ion battery

Power density

10.1002/cssc.202101856

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Citations (14)