High-concentration bis-fluorosulfonyl lithium imide-lithium nitrate-1, 3-dioxolane electrolyte, preparation method thereof and corresponding battery

• Main Authors: XIE JIANNAN, ZHANG PENG, HAN GAIGE, CHEN LIXIA, JIN MINGGANG
• Format: Patent
• Language: Chinese; English
• Published: 20.09.2019
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention discloses a high-concentration bis-fluorosulfonyl lithium imide-lithium nitrate-1, 3-dioxolane electrolyte, a preparation method thereof and a corresponding battery. The electrolyte is a dual electrolyte composed of a bis-fluorosulfonyl lithium imide lithium salt and lithium nitrate-1, 3-dioxolane; the bis-fluorosulfonyl lithium imide lithium salt is used as a lithium ion transmission electrolyte in the electrolyte, meanwhile used as an improvement agent for the lithium metal negative electrode stability, and has the concentration of 2.5-3mol L-1; lithium nitrate is used as a lithium metal negative electrode surface passivation agent and has the concentration of 0.5-0.8 mol L-1; and 1, 3-dioxolane is used as an organic solvent and is used for dissolving the bis-fluorosulfonyl lithium imide lithium salt and lithium nitrate. The electrolyte provided by the invention has a very high effect of inhibiting the formation of lithium dendritic crystals and improving the cycling stability of the negative