A secondary battery is provided and including a positive electrode, a negative electrode, and an electrolytic solution, where the negative electrode is metal lithium, and the electrolytic solution contains a sulfonyl group-containing lithium salt; a glyme-based solvent; and a specific additive.

The present disclosure provides a non-aqueous electrolyte including an additive for a non-aqueous electrolyte represented by the following Chemical Formula 1:

##STR00001## wherein, A ring may be a cyclic phosphate group having 2 or 3 carbon atoms, R may be an alkylene group or alkenylene group having 1 to 5 carbon atoms, and X may be a perfluoroalkyl group having 1 to 5 carbon atoms.

An additive, an electrolyte for a rechargeable lithium battery, and a rechargeable lithium battery, the additive being represented by Chemical Formula 1:

##STR00001##

The invention relates to electrochemical current sources, more particularly to metal-air current sources, and even more particularly to lithium-air current sources and their electrodes. A cathode comprises a base made of a porous electrically conducting material that is permeable to molecular oxygen, the working surface of which has a copolymer applied thereto, which is produced by the copolymerization of a monomeric transition metal coordination complex having a Schiff base and a thiophene group monomer. The monomeric transition metal coordination complex having a Schiff base can be, for example, a compound of the [M(R,R-Salen)], [M(R,R-Saltmen)] or [M(R,R-Salphen)] type, and the thiophene group monomer can be a compound selected from a thiophene group consisting of 3-alkylthiophenes, 3,4-dialkylthiophenes, 3,4-ethylenedioxythiophene or combinations thereof. A current source comprises the described cathode and an anode made from an active metal, in particular lithium, wherein the cathode and the anode are separated by an electrolyte containing ions of the metal from which the anode is made. It has been established that in this system, the copolymer exhibits the properties of an effective catalyst. The technical result is an increase in the specific energy, specific power and number of charge and discharge cycles of a metal-air current source.

A secondary battery includes: a positive electrode; a negative electrode including a negative electrode active material layer on which a film including an organic substance is formed; and an electrolytic solution including a sulfur-containing cyclic compound, a fluorinated cyclic carbonic acid ester, an unsaturated cyclic carbonic acid ester, and a multi-nitrile chain compound. According to a mass analysis of the electrolytic solution using gas chromatography-mass spectrometry, a content of the sulfur-containing cyclic compound, a content of the fluorinated cyclic carbonic acid ester, a content of the unsaturated cyclic carbonic acid ester, and a content of the multi-nitrile chain compound in the electrolytic solution each satisfy the following relation: the content of the multi-nitrile chain compound > the content of the fluorinated cyclic carbonic acid ester > the content of the sulfur-containing cyclic compound > the content of the unsaturated cyclic carbonic acid ester, and the total sum of those contents is greater than or equal to 5.0 wt% and less than or equal to 11.0 wt%.

A method for cutting electrode foils (1) by means of a particle stream (2) is proposed. A cutting device (4) for cutting electrode foils (1) that are intended for use in a battery cell is also specified which comprises at least one nozzle (5) with an outlet (6), one cutting tool (7), one vibration device (8) for exciting at least the cutting tool (7) to vibration (14), one particle feed line (9) for supplying at least particles (13), and one gas feed line (10) for supplying a first gas stream (12), wherein the particles (13) and the first gas stream (12) can be mixed in the cutting device (4) to form a particle stream (2) and fed via the nozzle (5) to the outlet (6), wherein the cutting tool (7) and the outlet (6) can be arranged above the electrode foil (1) with separation (11) from a surface (3) of the electrode foil (1), and wherein the electrode foil (1) can be cut at least as a result of the particle stream (2) and the vibrations (14) of the cutting tool (7).

A method for cutting electrode foils and a device for cutting electrode foils that are intended for use in a battery cell are proposed. The cutting device

comprises a cutting tool, a vibration device for exciting at least the cutting tool to vibration, and a particle feed line for feeding at least particles. The cutting tool can be arranged above the electrode foil with a separation from a surface of the electrode foil, and the electrode foil can be cut at least as a result of the vibrations of the cutting tool that are transmitted to at least one particle.

Novel, rechargeable magnesium/magnesium sulfide batteries are disclosed therein, having energy density competitive with lithium batteries, high cycle life, and lower cost. Production method of stabilized MgS is also described, as well as various cells constructions.

The present disclosure discloses a capacity-compensation electrolyte additive and electrolyte having the same, the additive comprises one or more of Li.sub.xP.sub.y, Na.sub.mP.sub.n and K.sub.pP.sub.q, where 0<x≤3, 0<y≤11, 0<m≤3, 0<n≤11, 0<p≤3 and 0<q≤11, the electrolyte is applied to a lithium-ion battery, a sodium-ion battery or a potassium-ion battery. The additive can decompose active ions and electrons during whole charge-discharge cycle, and improves the initial Coulombic efficiency of the battery, specific capacity and cycling stability, so as to achieve uniform capacity compensation; and the additive is dissolved prior to electrolyte solvents, the products stabilize both of cathode and anode solid electrolyte layer, and improve capacity retention ratio in batteries so as to achieve stable cycling. Adding additive in electrolyte will not hazard electrode structure, can achieve uniform capacity compensation, has higher safety and easy to implement.

The present disclosure discloses a capacity-compensation electrolyte, comprising: an organic solvent, an electrolyte salt and an electrolyte additive capable of compensating ions and electrons simultaneously; wherein the electrolyte additive comprises: a component capable of compensating ions and electrons simultaneously, or a composition of a component capable of compensating ions and a component capable of compensating electrons; the component capable of compensating ions and electrons simultaneously refers to a component capable of decomposing and releasing active ions and electrons simultaneously in the electrolyte during the working process of the battery; the component capable of compensation ions refers to a component capable of decomposing and releasing active ions in the electrolyte during the working process of the battery solution; and the component capable of compensation electrons refers to a component capable of decomposing and releasing electrons in the electrolyte during the working process of the battery solution.