Anion binding agent lithium salts for battery electrolytes

US11845765B1 · kind B1 · utility

Assignee

• National Technology & Engineering Solutions of Sandia, LLC · US

Inventors

• Christopher J. Orendorff · Albuquerque, US
• Ganesan Nagasubramanian · La Cañada Flintridge, US
• Kyle R. Fenton · Albuquerque, US
• David Ingersoll · Albuquerque, US
• Harry Pratt · Albuquerque, US
• Chad Staiger · Albuquerque, US
• Travis Mark Anderson · Albuquerque, US

Key dates

• Filing date: Oct 27, 2020
• Grant date: Dec 19, 2023
• Expiry date: Jul 19, 2042

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01M2300/008
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

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.