Sodium-based batteries (SIBs) have been gathering substantial attention in recent years as potential replacements for lithium-ion batteries, taking advantage of sodium’s abundance and low cost. However, realizing the full potential of these batteries requires a profound understanding of all system components, particularly the electrolyte, which is central to high performance and cell aging.

These batteries typically employ carbonate-based solutions as electrolytes, chosen for their high ionic conductivity, stability, and compatibility with both, the anode and cathode materials. However, the storage of these carbonate solutions has proven to be of particular challenge. These electrolyte solutions can decompose over time, producing various degradation products that can compromise the performance and safety of the battery. Traditionally, lithium salts are used as battery additives to reduce solution degradation. Whether sodium salt electrolyte additives can be used as a substitute in this area and what their performance is, our new sodium salt products such as NaDFOB and LiPF6 provide a solution.

Karlsruhe Institute of Technology (KIT), Institute for Applied Materials, has made a significant discovery by using CHEMFISH’s (LiPF6 99.9%), NaDFOB, the results of which have been published in the journal MDPI https://www.mdpi.com/2313-0105/9/11/530.

https://publikationen.bibliothek.kit.edu/1000163462

NaDFOB stands out as a highly effective conducting salt for SIB electrolytes due to its exceptional ionic conductivity and electrochemical stability. Its robust nature makes it a suitable choice for achieving stable electrolyte–electrode interfaces, even at high voltages. This property is critical for preserving the structural integrity of both electrodes and electrolytes, thereby enhancing the long-term performance and safety of SIBs. NaDFOB’s unique molecular structure contributes to its remarkable compatibility with various electrode materials and supports efficiention transport within the battery system, facilitating high-rate capability and prolonged cycle life.

Composition and conditions of the CHEMFISH NaPF6 electrolyte

In the KIT team study, they investigated the effects of storage conditions and conductive salt sources on the formation of volatile degradation products in liquid electrolytes. Significant variations were observed in the formation of degradation products based on the choice of the conductive salt. Notably, electrolytes utilizing very pure NaPF6 (99.9%) showed a markedly lower amount of degradation product formation compared to those using NaPF6 in pure quality (99.5%), underlining the influence of raw material quality on electrolyte stability. Therefore, high purity sodium salt electrolyte additives are excellent for slowing down battery degradation to improve performance.

For more CHEMFISH sodium-based products, please inquire: sales@chemfish.co.jp