The present invention relates to a lithium bis (fluorosulfonyl) imide salt, characterized in that, after dissolving in water to form an aqueous solution, said aqueous solution has a pH of between 4 and 8, in particular at a pH of between 4 and 8. temperature of 25 ° C, and its uses in Li-ion batteries. The present invention also relates to a lithium bis (fluorosulfonyl) imide salt, comprising an H + ion content of between 0.08 ppb and 0.80 ppm, between 0.08 ppb and 0.63 ppm or between 0.25 ppb and 2.53 ppb.
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