High-voltage lithium ion battery electrolyte and preparation method thereof
By using a multi-component, multi-level synergistic design of high-voltage lithium-ion battery electrolytes, and by constructing a multifunctional composite additive system using doped carbon-encapsulated mesoporous silica core-shell additives and ionic liquid composite ZIF-8 powder, the problem of poor long-term stability of electrolytes under high voltage in existing technologies is solved, and the high efficiency, stability and safety of batteries are achieved.
CN122246267APending Publication Date: 2026-06-19ANHUI CHAODIAN NEW ENERGY DEV CO LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ANHUI CHAODIAN NEW ENERGY DEV CO LTD
- Filing Date
- 2026-03-25
- Publication Date
- 2026-06-19
Smart Images
Figure REF-OBJ-1774401482142-000003
Abstract
This invention discloses a high-voltage lithium-ion battery electrolyte and its preparation method, belonging to the field of lithium-ion battery technology. First, a doped carbon-encapsulated mesoporous silica core-shell additive is prepared. Then, an ester-containing silanized imidazole ionic liquid is synthesized and subjected to free radical polymerization and ion exchange with ZIF-8 powder, azobisisobutyronitrile, and divinylbenzene to obtain an ionic liquid composite ZIF-8 powder. Finally, the doped carbon-encapsulated mesoporous silica core-shell additive and the ionic liquid composite ZIF-8 powder are added to a dual-salt electrolyte base composed of ethylene carbonate, methyl ethyl carbonate, propyl propionate, lithium hexafluorophosphate, and lithium difluorooxalate borate to obtain a high-voltage lithium-ion battery electrolyte. This significantly improves the long-term cycle stability, high-temperature storage performance, and interface structure stability of lithium-ion batteries.
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