High-voltage long-cycle ester-based sodium-ion battery electrolyte and sodium-ion battery

• Main Authors: DOU SHIXUE, ZHOU XUNZHU, KUANG WENXI, LI LIN, CHEN XIAOMIN, CHOU SHULEI
• Format: Patent
• Language: Chinese; English
• Published: 28.06.2024
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention provides a high-voltage long-cycle ester-based sodium-ion battery electrolyte and a sodium-ion battery, and belongs to the field of sodium-ion batteries. The electrolyte comprises a sodium salt, an organic ester-based solvent and a sulfur-containing additive. The sulfur-containing additive disclosed by the invention generates a sulfur-containing inorganic matter-rich interfacial film with low impedance, high ionic conductivity and high mechanical strength on a sodium-ion battery interface, so that the continuous decomposition of a solvent is inhibited, and the cycle performance of the battery is improved. Meanwhile, compared with a common commercial ester-based electrolyte, the electrolyte containing the sulfur-containing additive can effectively broaden the electrochemical window of the ester-based electrolyte and improve the ionic conductivity of the ester-based electrolyte under a wide-temperature condition, and a low-cost simple scheme is provided for commercial application of the ester-base