The invention relates to a process for preparing bis(fluorosulfonyl) imide, comprising the steps of: i) providing a stream A1 containing HF and a reactor containing a liquid phase A2 that contains bis(chlorosulfonyl) imide; ii) in said reactor, bringing said liquid phase A2 into contact with said stream A1 to produce bis(fluorosulfonyl) imide, said process being characterized in that said stream A1 is injected into said liquid phase A2.

The invention relates to a process for preparing bis(fluorosulfonyl) imide, comprising the steps of: i) providing a stream A1 containing hydrofluoric acid; providing a reactor containing a liquid phase A2 that contains bis(halosulfonyl) imide; providing at least one mixing device that is connected to the inlet of said reactor; ii) supplying liquid phase A2 and stream A1 to the at least one mixing device; iii) bringing liquid phase A2 into contact with stream A1 in the mixing device to form a reaction mixture B in liquid form containing bis(fluorosulfonyl) imide; iv) introducing the reaction mixture B produced in step iii) into the liquid phase A2 in the reactor.

A negative electrode material mixture with a negative electrode active material including a Si-containing material and a carbon material; and a carbon nanotube. The Si-containing material includes, a first composite material in which Si particles are dispersed in a lithium silicate phase and/or a carbon phase, and a second composite material in which Si particles are dispersed in a SiO.sub.2 phase, at least the first composite material. A mass ratio X of the first composite material to a total of the first and second composite materials, and a mass ratio Y of the total of the first second composite materials to a total of the first composite material, the second composite material, and the carbon material satisfy a relational expression (1): 100Y−32.2X.sup.5+65.479X.sup.4−55.832X.sup.3+18.116X.sup.2−6.9275X−3.5356<0, X≤1, and 0.06≤Y. The non-aqueous electrolyte includes LiPF.sub.6 and LiN(SO.sub.2F).sub.2.

An aqueous solution containing an alkali metal bis(fluorosulfonyl)imide, in which a total content of the alkali metal bis(fluorosulfonyl)imide and water is 98 mass % or more with respect to a total amount of the aqueous solution, and a pH is −3 to 10.

An aqueous solution containing an alkali metal bis(fluorosulfonyl)imide, in which a total content of the alkali metal bis(fluorosulfonyl)imide and water is 98 mass % or more with respect to a total amount of the aqueous solution, and a pH is −3 to 10.

A method of producing purified bis(fluorosulfonyl) imide includes providing a liquid mixture including bis(fluorosulfonyl) imide and fluorosulfonic acid and then contacting the liquid mixture with gaseous ammonia. The gaseous ammonia reacts with the fluorosulfonic acid to produce ammonium fluorosulfate. The method further includes separating the liquid mixture from the ammonium fluorosulfate.

This application discloses a lithium-ion battery, and related battery module, a battery pack, and an apparatus. The lithium-ion battery includes a positive electrode plate, a negative electrode plate, a separator, and an electrolyte, where the negative electrode plate includes a negative electrode active material layer containing a negative electrode active material, and the electrolyte includes an electrolyte lithium salt. The electrolyte lithium salt includes a first lithium salt, the first lithium salt is selected from fluorine-containing sulfonimide lithium salts, and the first lithium salt and the negative electrode plate satisfy the following relation (1). The lithium-ion battery of this application has high safety performance, long cycle life, and good high-temperature storage performance.

[00001]$\begin{array}{cc}0.6\le \frac{M_E\times C_I}{\frac{M_A}{P{D}_A}\times P_A}\le 6.2& \left(1\right)\end{array}$

This application discloses a lithium-ion battery, and related battery module, a battery pack, and an apparatus. The lithium-ion battery includes a positive electrode plate, a negative electrode plate, a separator, and an electrolyte, where the negative electrode plate includes a negative electrode active material layer containing a negative electrode active material, and the electrolyte includes an electrolyte lithium salt. The electrolyte lithium salt includes a first lithium salt, the first lithium salt is selected from fluorine-containing sulfonimide lithium salts, and the first lithium salt and the negative electrode plate satisfy the following relation (1). The lithium-ion battery of this application has high safety performance, long cycle life, and good high-temperature storage performance.

[00001]$\begin{array}{cc}0.6\le \frac{M_E\times C_I}{\frac{M_A}{P{D}_A}\times P_A}\le 6.2& \left(1\right)\end{array}$

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.

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.