Recently, a groundbreaking study on dendrite suppression in lithium metal batteries by Central South University was published in the international journal Applied Surface Science (DOI: 10.1016/j.apsusc.2023.156968). This research successfully achieved stable cycling of lithium metal batteries by introducing a novel ionic liquid additive combined with an efficient electrolyte system. Notably, our company (CHEMFISH) provided lithium bis(fluorosulfonyl)imide (LiFSI) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) as core electrolyte materials, which provided critical support for constructing the electrolyte system in the study and demonstrated the important value of the company's products in the field of high-end battery research and development.

Article Title：Ionic liquid as electrostatic shielding additive for dendrite-free lithium metal battery - ScienceDirect

https://www.sciencedirect.com/science/article/abs/pii/S016943322300644X

Lithium metal, with its ultra-high theoretical specific capacity (3860 mAh g⁻¹) and low potential (-3.04 V vs. SHE), is regarded as an ideal anode material for next-generation high-energy-density batteries. However, the disordered growth of lithium dendrites leads to electrolyte consumption, unstable interfaces, and safety hazards, seriously hindering its commercial application. Developing efficient and environmentally friendly dendrite suppression technologies has become a key focus for the industry.

https://www.sciencedirect.com/science/article/abs/pii/S016943322300644X

Core Technical Breakthrough: Synergistic Innovation of Ionic Liquid Electrostatic Shielding and CHEMFISH Lithium Salts

1. Novel Ionic Liquid Additive: Constructing a Self-Healing Electrostatic Shielding Layer

The research team designed an ionic liquid Pyr1(10)TFSI (N-methyl-N-decylpyrrolidinium bis(trifluoromethanesulfonyl)imide) with long aliphatic chains. Its cation (Pyr1(10)⁺) is adsorbed on the lithium metal/electrolyte interface through electrostatic interactions, forming a "lithium-repellent" shielding layer that homogenizes lithium ion distribution and inhibits dendrite tip growth. Experiments show that this additive enables a full battery with a low N/P ratio (3:1) to achieve 80% capacity retention after 270 cycles, with a Coulombic efficiency as high as 99.9%.

2. CHEMFISH Lithium Salts: The Foundation of the Electrolyte System

In this study, LiFSI and LiTFSI provided by CHEMFISH were used as the base lithium salts to construct an ether-based electrolyte system (such as 1 M LiFSI/DOL-DME). Their core roles include:

• High Ionic Conductivity: The strong dissociation ability of LiFSI provides an efficient pathway for lithium ion migration, ensuring the stability of the battery during charging and discharging.
• Interface Compatibility: Synergizing with the Pyr1(10)TFSI additive to optimize the structure of the solid electrolyte interface (SEI), reducing side reactions and lithium consumption.
• Material Reliability: CHEMFISH lithium salts' high purity (≥99.5%) and stable batch quality ensure the repeatability of experimental data and the feasibility of process scaling.

Research Value: Paving the Way for Next-Generation Battery Commercialization

This study is the first to confirm the interfacial adsorption mechanism of ionic liquid cations through surface-enhanced Raman spectroscopy (SERS) and electrochemical impedance spectroscopy (EIS), providing direct experimental evidence for the "electrostatic shielding effect." Meanwhile, the successful application of CHEMFISH lithium salts demonstrates that the company's products have been deeply integrated into the R&D chain of cutting-edge battery technologies, and their high-performance electrolyte materials can meet the requirements of advanced systems such as high-nickel cathodes and ultra-thin lithium anodes.

As the alma mater of BYD's founder, Central South University holds leading technologies in the battery field. The research team's achievements in lithium metal batteries provide an innovative solution to the problem of disordered lithium dendrite growth. This achievement not only promotes the development of high-energy-density batteries but also brings new hope for improving battery performance in industries such as electric vehicles and drones. As a professional supplier of high-performance lithium salts, CHEMFISH played a key role in this study and, relying on the technical support of Central South University, continues to develop new products to further consolidate its leading position in the battery and new energy materials market segments.