A core-shell cathode lithium-supplementing additive, a preparation method therefor, and an application thereof. The core-shell cathode lithium-supplementing additive of the present application comprises a core body and a coating layer covering the core body, the coating layer being an isolating conductive packaging layer, the core body containing a lithium-supplementing material, and the lithium-supplementing material comprising Li.sub.2+cA.sub.cB.sub.1c and/or Li.sub.aX.sub.b, wherein 0c1, A is at least one of N and P, B is at least one of S and O, 1a3, 1b3, and X is any one selected from F, S, N, B, P, O, and Se. The lithium-supplementing material contained in the core-shell cathode lithium-supplementing additive of the present application is rich in lithium, thereby increasing the Coulombic efficiency and improving the overall electrochemical performance of a battery.

A core-shell cathode lithium-supplementing additive, a preparation method therefor, and an application thereof. The core-shell cathode lithium-supplementing additive of the present application comprises a core body and a coating layer covering the core body, the coating layer being an isolating conductive packaging layer, the core body containing a lithium-supplementing material, and the lithium-supplementing material comprising Li.sub.2+cA.sub.cB.sub.1c and/or Li.sub.aX.sub.b, wherein 0c1, A is at least one of N and P, B is at least one of S and O, 1a3, 1b3, and X is any one selected from F, S, N, B, P, O, and Se. The lithium-supplementing material contained in the core-shell cathode lithium-supplementing additive of the present application is rich in lithium, thereby increasing the Coulombic efficiency and improving the overall electrochemical performance of a battery.

Methods for making high-purity LiFSI salts and intermediate products using one, the other, or both of a reactive-solvent removal/replacement method and an LiFSI purification method. In some embodiments, the reactive-solvent removal/replacement method includes using non-reactive anhydrous organic solvents to remove and/or replace one or more reactive solvents in a crude LiFSI. In some embodiments, the LiFSI purification method includes using anhydrous organic solvents to remove impurities, such as synthesis impurities, from a crude LiFSI. In some embodiments, crude LiFSI can be made using an aqueous-based neutralization process. LiFSI salts and products made using methods of the disclosure are also described, as are uses of such salts and products and electrochemical devices that include such salts and products.

Methods for making high-purity LiFSI salts and intermediate products using one, the other, or both of a reactive-solvent removal/replacement method and an LiFSI purification method. In some embodiments, the reactive-solvent removal/replacement method includes using non-reactive anhydrous organic solvents to remove and/or replace one or more reactive solvents in a crude LiFSI. In some embodiments, the LiFSI purification method includes using anhydrous organic solvents to remove impurities, such as synthesis impurities, from a crude LiFSI. In some embodiments, crude LiFSI can be made using an aqueous-based neutralization process. LiFSI salts and products made using methods of the disclosure are also described, as are uses of such salts and products and electrochemical devices that include such salts and products.

The present invention relates to a composition comprising an alkali metal salt of bis(fluoro sulfonyl)imide and to the use of such composition in an electrolyte for batteries.

The present invention relates to a composition comprising an alkali metal salt of bis(fluoro sulfonyl)imide and to the use of such composition in an electrolyte for batteries.

The present invention relates to a composition comprising an alkali metal salt of bis(fluorosulfonyl)imide and to the use of such composition in an electrolyte for batteries.

The present invention relates to a composition comprising an alkali metal salt of bis(fluoro sulfonyl)imide and to the use of such composition in an electrolyte for batteries.

The present invention relates to a production method for a bis(fluorosulfonyl)imide metal salt solution, and more specifically, relates to a production method for powder of bis(fluorosulfonyl)imide metal salts represented by Formula 2 by performing azeotropic distillation on an aqueous bis(fluorosulfonyl)imide metal salt solution represented by Formula 2, which is produced by reacting bis(fluorosulfonyl)imide represented by Formula 1 as a starting material with a powder-type metalized reagent.

By the production method according to the present invention, no waste is generated at all by directly reacting a bis(fluorosulfonyl)imide compound with a powder-type metalized reagent without using a solvent so that, unlike the prior art, bis(fluorosulfonyl)imide metal salts can be produced in an eco-friendly way. The production method according to the present invention is very economical since a bis(fluorosulfonyl)imide metal salt solution can be easily mass-produced with a high yield and high purity by performing rapid condensation using azeotropic distillation to remove a small amount of water within 10 weight % generated during the reaction. The production process is simple with respect to a production process for powder form, and has advantages in terms of excellent storage and usability.

The present invention relates to a production method for a bis(fluorosulfonyl)imide metal salt solution, and more specifically, relates to a production method for powder of bis(fluorosulfonyl)imide metal salts represented by Formula 2 by performing azeotropic distillation on an aqueous bis(fluorosulfonyl)imide metal salt solution represented by Formula 2, which is produced by reacting bis(fluorosulfonyl)imide represented by Formula 1 as a starting material with a powder-type metalized reagent.

By the production method according to the present invention, no waste is generated at all by directly reacting a bis(fluorosulfonyl)imide compound with a powder-type metalized reagent without using a solvent so that, unlike the prior art, bis(fluorosulfonyl)imide metal salts can be produced in an eco-friendly way. The production method according to the present invention is very economical since a bis(fluorosulfonyl)imide metal salt solution can be easily mass-produced with a high yield and high purity by performing rapid condensation using azeotropic distillation to remove a small amount of water within 10 weight % generated during the reaction. The production process is simple with respect to a production process for powder form, and has advantages in terms of excellent storage and usability.