An electrochemical apparatus includes a positive electrode plate, a negative electrode plate, a separator, and an electrolyte. The negative electrode plate includes a negative electrode active material layer, and the negative electrode active material layer includes a negative electrode active material, where mass of the negative electrode active material is a g. The electrolyte includes ethylene carbonate, where based on a mass of the electrolyte, a mass percentage of the ethylene carbonate is b%, and 1.6≤b/a≤6.4. A ratio of the mass percentage of the ethylene carbonate in the electrolyte to the mass of the negative electrode active material is controlled, so that cycling performance, a thickness swelling rate after high-temperature storage, a capacity retention rate after storage, and safety performance of the electrochemical apparatus can be improved.

An electrolyte for a lithium secondary battery includes a lithium salt, an organic solvent, and a compound represented by Chemical Formula 1. The compound forms a solid electrolyte interphase on a surface of an anode. A lithium secondary battery including the electrolyte and having improved high-temperature storage properties can be provided.

A lithium secondary battery is disclosed herein. In some embodiments, a lithium secondary battery includes a positive electrode including a positive electrode active material, a negative electrode including a negative electrode active material, where the negative electrode active material consists of a silicon-based material, a separator disposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte solution, wherein the non-aqueous electrolyte solution includes a lithium salt including LiPF.sub.6 and LiN(FSO.sub.2).sub.2, an additive including a sultone-based compound, and an organic solvent including a non-fluorine-based linear carbonate solvent and a fluorine-based cyclic carbonate solvent.

The present application provides an electrolytic solution, a secondary battery, and a power consumption apparatus. The electrolytic solution may include a solvent and an additive; the solvent may include a compound of formula I, and a mass percentage of the compound of formula I in the solvent may be 35% or more; in formula I, R.sub.1 and R.sub.2 are each independently selected from any one of a hydrogen atom, a C1-C3 chain alkyl group, and a C2-C3 alkenyl group; and the additive may include a compound of formula II, and in formula II, R.sub.3, R.sub.4, and R.sub.5 are each independently selected from any one of a hydrogen atom, a fluorine atom, a phenyl group, a cyano group, a C1-C6 chain alkyl group, a C3-C6 cyclic alkyl group, and a C2-C6 alkenyl group.

##STR00001##

The present disclosure provides an additive for an electrolyte for a lithium battery, an electrolyte, and an electrochemical device. The additive includes a compound represented by the following formula I, wherein R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are identical to or different from each other, and are independently selected from a group consisting of hydrogen, halogen, substituted or unsubstituted C.sub.1-C.sub.20 alkyl, and substituted or unsubstituted C.sub.6-C.sub.18 aryl, and a substituent of the substituted or unsubstituted C.sub.1-C.sub.20 alkyl or the substituted or unsubstituted C.sub.6-C.sub.18 aryl can be halogen, C.sub.1-C.sub.20 alkyl, or C.sub.6-C.sub.18 aryl; wherein denotes a single bond or a double bond; and wherein n is 1 or 2.

##STR00001##

An electrochemical device including an electrolyte. The electrolyte includes a non-fluorinated cyclic carbonate and an ether multi-nitrile compound. The non-fluorinated cyclic carbonate includes ethylene carbonate. Based on a mass of the electrolyte, a content of the ethylene carbonate is X %, and a content of the ether multi-nitrile compound is A %. The electrochemical device further includes a positive electrode. The positive electrode includes a positive electrode active material layer and a positive current collector. The positive electrode active material layer includes a positive electrode active material. The positive electrode active material includes an element M. The element M includes at least one of Al, Mg, Ti, Zr, or W. Based on a mass of the positive electrode active material, a content of the element M is C ppm, 1000≤C≤22000, X+A≤15, and 133≤C/A≤22000.

Electrode for an energy storage device which comprises a powder of particles (26) comprising amorphous, micro- or nano-crystalline coated or uncoated silicon oxynitride having a chemical formula SiN.sub.xO.sub.y, where 0.03≤x+y<1.3, whereby nitrogen makes up 10-99% of said x+y value with the balance being oxygen.

The present invention relates to a lithium secondary battery, the lithium secondary battery comprising: a cathode containing a cathode active material, an anode containing an anode active material; and an electrolyte containing a non-aqueous organic solvent, a lithium salt, and an additive represented by Chemical Formula 1, wherein the lithium secondary battery has a volume of 16 cm.sup.3 to 84 cm.sup.3.

This disclosure relates generally to battery cells, and more particularly, electrolyte additives for use in lithium ion battery cells.

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.