Electrolyte suitable for lithium-ion battery of silicon-carbon system and lithium-ion battery

A lithium-ion battery, comprising an electrolyte, wherein the electrolyte comprises an organic solvent, an additive, and a lithium salt, and the additive comprises lithium trifluoromethyl triethyl borate, prop-1-ene-1,3-sultone, and fluoroethylene carbonate;

• a content of lithium trifluoromethyl triethyl borate accounts for 0.8 wt % to 2 wt % of a total mass of the electrolyte, a content of prop-1-ene-1,3-sultone accounts for 0.8 wt % to 3.5 wt % of a total mass of the electrolyte, and a content of fluoroethylene carbonate accounts for 9 wt % to 20 wt % of a total mass of the electrolyte;
• the additive further comprises at least one of succinonitrile, glycerol trinitrile, 1,3,6-hexanetricarbonitrile, and 1,2-bis(cyanoethoxy) ethane, and a content thereof accounts for 1 wt % to 5 wt % of a total mass of the electrolyte;
• and
• the lithium-ion battery further comprises a negative electrode plate, the negative electrode plate comprises a negative electrode active material layer, the negative electrode active material layer comprises a negative electrode active material, and the negative electrode active material is selected from a silicon-carbon negative electrode material composed of nano-silicon and/or SiOx (0.8≤x≤1.3) and graphite;
• and one or more of the nano-silicon and SiOx account for 1 wt % to 55 wt % of a total mass of the silicon-carbon negative electrode material.