An electrochemical cell including at least one nitrogen-containing compound is disclosed. The at least one nitrogen-containing compound may form part of or be included in: an anode structure, a cathode structure, an electrolyte and/or a separator of the electrochemical cell. Also disclosed is a battery including the electrochemical cell.

Provided are an electrolyte for a non-aqueous electrolyte battery using a positive electrode including nickel, where the battery generates a small amount of gas during a durability test even if the cell potential reaches 4.1 V or more, as well as a non-aqueous electrolyte battery using the electrolyte. In the electrolyte for a non-aqueous electrolyte battery including a positive electrode including at least one selected from the group consisting of oxides containing nickel and phosphates containing nickel as a positive electrode active material, the electrolyte comprises (I) a non-aqueous organic solvent, (II) a fluorine-containing solute being an ionic salt, (III) at least one additive selected from the group consisting of compounds represented by formulae (1) and (2), and (IV) hydrogen fluoride in an amount of 5 mass ppm or more and less than 200 mass ppm based on the total amount of the components (I), (II), and (III). ##STR00001##

An electrochemical cell is disclosed comprising a carbonate:nitrile type solvent mixture based electrolyte. The electrolyte may comprise an alkali salt and/or at least one polymer additive. The alkali salt cation may be a lithium cation and/or the alkali salt anion may comprise an oxalato-borate group. The electrolyte may further comprise one or more electrolyte additives, which may be an SEI improving additive. The anode may comprise carbon. The anode may be an alkali metal anode. The operating voltage and energy density performance of the disclosed invention is at the same level as the performance of presently market—leading battery cells, thereby these disclosed improvements do not come at the expense of battery performance. The utility of the herein disclosed battery electrolyte allows stable cycling of advanced Li-ion battery electrodes, an extended operating temperature range and improves battery safety by making the electrolyte less reactive and volatile than conventional LiPF6 electrolyte salt in carbonate solvents.

An electrolyte solution including a solvent, the solvent containing a compound (1a) represented by the following formula (1a); and

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a compound (2) represented by the following formula (2):

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wherein R.sup.e is a C1-C5 linear or branched alkyl group optionally containing an ether bond; R.sup.f is a C1-C5 linear or branched alkyl group optionally containing an ether bond; and at least one of R.sup.e or R.sup.f contains a fluorine atom. Also disclosed is an electrochemical device including the electrolyte solution, a lithium-ion secondary battery including the electrolyte solution, and a module including the electrochemical device or the lithium-ion secondary battery.

An electrolyte including a dinitrile compound, a trinitrile compound, and propyl propionate. Based on the total weight of the electrolyte, the weight percentage of the dinitrile compound is X, the weight percentage of the trinitrile compound is Y, and the weight percentage of the propyl propionate is Z, wherein about 2.2 wt %≤(X+Y)≤about 8 wt %, about 0.1≤(X/Y)≤about 6, 1 wt %≤Y<5 wt %, about 5 wt %≤Z≤about 50 wt %, and about 0.02<(Y/Z)≤about 0.3. The electrolyte further includes at least one selected from the group consisting of a cyclic carbonate ester having a carbon-carbon double bond, a fluorinated chain carbonate ester, a fluorinated cyclic carbonate ester, and a compound having a sulfur-oxygen double bond.

The present invention relates to an electrochemical device comprising a) a positive electrode, b) a negative electrode, c) a separator, and d) a liquid electrolyte, wherein at least one of said positive electrode and said negative electrode is a gelled electrode comprising an electronic conductive substrate and directly adhered onto the electronic conductive substrate, at least one layer of a gelled electrode-forming composition, and wherein the d) liquid electrolyte comprises at least one organic carbonate and/or at least one ionic liquid, and at least one metal salt. The present invention also relates to a process for manufacturing an electrochemical device comprising at least one gelled electrode.

Provided are an electrolytic solution suitable for a lithium ion secondary battery that includes a positive electrode which has a positive electrode active material having an olivine structure, and includes a negative electrode having graphite as a negative electrode active material, and a superior lithium ion secondary battery having the electrolytic solution. The lithium ion secondary battery includes: a positive electrode that includes a positive electrode active material having an olivine structure; a negative electrode having graphite as a negative electrode active material; and an electrolytic solution. The electrolytic solution contains LiPF.sub.6, a cyclic alkylene carbonate selected from ethylene carbonate and propylene carbonate, methyl propionate, and an additive that starts reductive degradation at a potential higher than a potential at which the above components of the electrolytic solution start reductive degradation.

An electrolyte, an electrochemical device containing same, and an electronic device. Specifically, an electrolyte, including dimethyl carbonate, ethyl methyl carbonate, and lithium bis(oxalato)borate. The ethyl methyl carbonate and the lithium bis(oxalato)borate each account for a specified weight percent in the electrolyte, and the weight percent of the dimethyl carbonate and the weight percent of the ethyl methyl carbonate in the electrolyte meet a specified relationship. The electrolyte provides with balanced rate performance, the low-temperature discharge performance, and the high-temperature storage and cycle performance of the electrochemical device, and helps to achieve excellent comprehensive performance of the electrochemical device.

A non-aqueous electrolyte solution for a lithium secondary battery and a lithium secondary battery including the same are disclosed herein. In some embodiments, a non-aqueous electrolyte includes a lithium salt, a non-aqueous solvent, a compound represented by Formula 1, and a compound represented by Formula 2, wherein the compound represented by Formula 1 and the compound represented by Formula 2 are included in a volume ratio of 1:0.1 to 1:1.5. Also, a lithium secondary battery including the non-aqueous electrolyte has improved high-temperature storage safety.

Lithium ion batteries and electrolytes therefor are provided, which include electrolyte additives having dithioester functional group(s) that stabilize the SEI (solid-electrolyte interface) at the surfaces of the anode material particles, and/or stabilize the CEI (cathode electrolyte interface) at the surfaces of the cathode material particles, and/or act as oxygen scavengers to prevent cell degradation. The electrolyte additives having dithioester functional group(s) may function as polymerization controlling and/or chain transfer agents that regulate the level of polymerization of other electrolyte components, such as VC (vinyl carbonate) and improve the formation and operation of the batteries. The lithium ion batteries may have metalloid-based anodes including mostly Si, Ge and/or Sn as anode active material particles.