Anion binding agent lithium salts for battery electrolytes
| DWPI Title: Synthesizing purified lithium salt used in electrolytes for electrochemical energy storage systems, involves dissolving boron-based acid, oxalic and malonic acid in first solvent, refluxing, vacuum filtrating, dissolving anion binding agent, adding small fluorinated salt, filtering and evaporating |
| Abstract: A method for synthesizing a purified lithium (Li)+ anion binding agent (ABA-F)− salt and the corresponding Li+(ABA-F)− are disclosed. The method includes dissolving a boron-based acid in a polar solvent to form a solution. The solution is refluxed to form an anion binding agent. A stoichiometric amount of a small fluorinated salt, such as LiF, is added to the anion binding agent to form a mixture. The mixture is subsequently crystallized to obtain a substantially pure Li+(ABA-F)− salt. Example purified Li+(ABA-F)− salts include Ox-Li+(ABA-F), m-Li+(ABA-F), and BF3—Li+(ABA-F)−. These purified Li+(ABA-F)− salts provide the benefits of increased battery thermal safety without loss of electrochemical performance. |
| Use: Method for synthesizing purified lithium salt used in electrolytes for electrochemical energy storage systems based on anion binding agents (ABAs). |
| Advantage: The method provides a more chemically stable electrolyte salt alternative to lithium hexafluorophosphate, reduces the severity of thermal runaway reactions in lithium-ion cells, and also provide stability to manganese dissolution in a variety of cathode formulations such as lithium manganese oxide, e.g. LiMnO2 and LiMn2O4 electrochemical cells. |
| Novelty: Synthesizing a purified lithium salt involves (a) dissolving one boron-based acid and one of an oxalic and a malonic acid in a first solvent to form a first solution, (b) refluxing the first solution and removing water therefrom using distillation to form a first mixture, (c) vacuum filtrating the first mixture to form a first filtrate, (d) washing the first filtrate with a non-polar solvent to form an anion binding agent, (e) dissolving the anion binding agent in a polar solvent to form a second solution, (f) adding a small fluorinated salt to the second solution to form a second mixture, (g) filtering the second mixture to form a second filtrate and (h) evaporating the second filtrate to obtain the purified lithium salt. |
| Filed: 10/27/2020 |
| Application Number: US17080935A |
| Tech ID: SD 13784.2 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
| Data from Derwent World Patents Index, provided by Clarivate All rights reserved. Republication or redistribution of Clarivate content, including by framing or similar means, is prohibited without the prior written consent of Clarivate. Clarivate and its logo, as well as all other trademarks used herein are trademarks of their respective owners and used under license. |