| abstract |
The present invention relates to a high energy density lithium ion secondary battery comprising a cathode including a high voltage cathode active material, a lithium metal anode, and a nonaqueous electrolyte, wherein the nonaqueous electrolyte includes a sulfonium imide salt having a fluorosulfonyl group and Chlorate, wherein the electrolyte is electrochemically stable at operating voltages greater than 4.2V. |