Method for drying and purifying lithium bis(fluorosulfonyl)imide salt
A method for drying and purifying a lithium bis(fluorosulfonyl)imide salt. Also, a method for producing a lithium bis(fluorosulfonyl)imide salt which is then dried and purified by the method. Further, a composition containing lithium bis(fluorosulfonyl)imide salt having a water content by mass of between 5 and 45 ppm. And, the use of the composition C in Li-ion batteries.
1. A composition C comprising:
at least 99.80% by weight of lithium bis(fluorosulfonyl)imide (LiFSI) salt relative to the total weight of said composition C;
between 5 ppm and 45 ppm by mass of water relative to the total mass of said composition C, and
a mass content of LiFSO 3 of less than or equal to 200 ppm.
2. The composition C as claimed in claim 1 , comprising a mass content of sulfate ions of less than or equal to 200 ppm by mass relative to the total mass of said composition C.
3. The composition C as claimed in claim 1 , comprising:
a mass content of sulfate ions of less than or equal to 200 ppm by mass relative to the total mass of said composition C; and
a mass content of Cl − of less than or equal to 50 ppm by weight;
a mass content of F − of less than or equal to 200 ppm;
a mass content of FSO 2 NH 2 of less than or equal to 200 ppm;
a mass content of CO 3 2 − of less than or equal to 50 ppm;
a mass content of ClO 3 − of less than or equal to 50 ppm;
a mass content of ClO 4 − of less than or equal to 50 ppm;
a mass content of NO 2 − of less than or equal to 50 ppm;
a mass content of NO 3 − of less than or equal to 50 ppm;
a mass content of Si of less than or equal to 40 ppm;
a mass content of Mg of less than or equal to 10 ppm;
a mass content of Fe of less than or equal to 10 ppm;
a mass content of Ca of less than or equal to 10 ppm;
a mass content of Pb of less than or equal to 10 ppm;
a mass content of Cu of less than or equal to 10 ppm;
a mass content of Cr of less than or equal to 10 ppm;
a mass content of Ni of less than or equal to 10 ppm;
a mass content of Al of less than or equal to 10 ppm;
a mass content of Zn of less than or equal to 10 ppm; and
a mass content of Na of less than or equal to 10 ppm.
4. A Li-ion battery comprising a composition C as claimed in claim 1 .
5. The Li-ion battery as claimed in claim 4 , wherein the Li-ion battery is in a mobile device, an electric vehicle, or a renewable energy generation system.