Abstract: An electrolyte solution includes an electrolyte salt and an organic solvent, wherein the electrolyte salt includes lithium bis(fluorosulfonyl)imide (LiFSI), and the percentage mass content of the lithium bis(fluorosulfonyl)imide (LiFSI) in the electrolyte solution is 4.5%-11%; the organic solvent includes ethylene carbonate, and the percentage mass contents of the ethylene carbonate and the lithium bis(fluorosulfonyl)imide satisfy: 0.9?WLiFSI/(16.77%?WEC)?2.9. The electrolyte solution of the present disclosure can make the battery take lower cell internal resistance, excellent high temperature storage performance and high temperature cycling performance into account at the same time.

Abstract: The present application discloses an electrolyte for a lithium secondary battery, a secondary battery, and an electric device. The electrolyte for a lithium secondary battery includes a sulfate ester and difluorophosphate ions, a molar ratio of the sulfate ester to the difluorophosphate ions is (0.2 to 30):1, and a molar concentration of the sulfate ester is 0.04 mol/L to 0.16 mol/L.

Abstract: A non-aqueous electrolyte includes an electrolyte salt and a non-aqueous solvent. The electrolyte salt includes a first lithium salt, a second lithium salt, and a third lithium salt, and the content A1 of the first lithium salt, the content A2 of the second lithium salt, and the content A3 of the third lithium salt, based on a total mass of the non-aqueous electrolyte, satisfy that: A1+A2+A3 is below 1%, A1/A2 is from 0.016 to 40, and A1/(A2+A3) is from 0.006 to 13.5.

Abstract: An electrolyte solution of a lithium ion battery is provided by limiting a relative ratio of cyclic ester to lithium salt in the electrolyte solution of the lithium ion battery, the electrolyte solution simultaneously containing the cyclic ester and the lithium salt has good conductivity, oxidation resistance, system stability and proper viscosity, and conductivity of a negative interface film may be improved, such that the lithium ion battery containing the electrolyte solution has a remarkably improved high-temperature storage performance and high-temperature cycle performance, and meanwhile has a good power performance.

Abstract: The present application provides a secondary battery and an electric apparatus. The secondary battery includes a positive electrode plate, a negative electrode plate, and an electrolyte. The positive electrode plate includes a lithium-containing transition metal phosphate, where the lithium-containing transition metal phosphate includes submicron-scale and micron-scale particles. In addition, the electrolyte in the secondary battery includes a lithium salt and a film-forming stabilizer, where the lithium salt includes a first lithium salt and a second lithium salt; where the first lithium salt includes lithium hexafluorophosphate, and the second lithium salt includes one or both of lithium bis(fluorosulfonyl)imide and lithium bis(trifluoromethanesulfonyl)imide. The secondary battery designed in the present application is conducive to balancing the energy density, rate performance, and cycling performance of the battery.

Abstract: A method for preparing an SEI (solid electrolyte interphase)-like film component additive, and an electrolyte solution comprising the SEI-like film component additive prepared by the method are provided. Compared with a conventional electrolyte solution (electrolyte solution without adding SEI-like film component additive), the electrolyte solution of the present application can prevent the loss of the effective ingredients caused by the dissolution of the SEI film on the negative electrode in the electrolyte solution during battery storage and use, and the electrolyte solution of the present application can also timely supplement the lost or damaged SEI film with effective ingredients, so that the damaged parts of the SEI film are quickly and timely supplemented.

Abstract: Provided are a non-aqueous electrolyte and a preparation method thereof, and a secondary battery and an electric apparatus containing the same. The non-aqueous electrolyte contains a non-aqueous solvent and lithium ions, first cations, and first anions dissolved therein, where the first cation is a metal cation Men+ other than the lithium ion, n representing a chemical valence of the metal cation; the first anion is a difluoroxalate borate anion DFOB; mass concentration of the first cations in the non-aqueous electrolyte is D1 ppm, and mass concentration of the first anions in the non-aqueous electrolyte is D2 ppm, both based on total mass of the non-aqueous electrolyte; and the non-aqueous electrolyte satisfies that D1 is 0.5 to 870 and that D1/D2 is 0.02 to 2. The non-aqueous electrolyte in this application enables the secondary battery to have good cycling performance, safety performance, and kinetic performance.

Abstract: A lithium secondary battery and an electric device. The lithium secondary battery comprises an electrolyte and a negative electrode sheet, wherein the electrolyte comprises a chain carboxylic ester and a cyclic carbonate, and the negative electrode sheet comprises a negative electrode current collector and a negative electrode film layer located on at least one side of the negative electrode current collector. Based on the total mass of the electrolyte, the mass content W1 of the chain carboxylic ester and the mass content W2 of the cyclic carbonate satisfy: 0.1?W2/W1?2, and the mass content W1 of the chain carboxylic ester and the thickness H of the negative electrode film layer satisfy: 0.2?H/100W1?20, with the unit of H being ?m.

Abstract: This application provides a secondary battery and an electric apparatus containing the same. The secondary battery includes a positive electrode plate, a negative electrode plate, and an electrolyte. Porosity of the positive electrode plate is A, porosity of the negative electrode plate is B, and the electrolyte includes a first component. The first component includes one or more compounds represented by formula 1, and a weight percentage of the first component in the electrolyte is D1. The secondary battery satisfies 0.80?A/B?1.20 and 0.14?100D1/B?1.50. The secondary battery of this application can achieve a balance among high energy density, good cycling performance, and good power performance.

Abstract: An electrolytic solution, a battery cell, a preparation method therefor, a battery, and an electrical device. The electrolytic solution includes an electrolyte salt and an additive, the electrolyte salt includes a first electrolyte salt shown in formula (1), the additive includes a first additive shown in formula (2), the content by weight of the first electrolyte salt in the electrolytic solution is denoted as x, the content by weight of the first additive in the electrolytic solution is denoted as y, both of which are calculated based on the total weight of the electrolytic solution, and 50?x/y?500.

Abstract: An electrolyte includes a non-aqueous solvent and an electrolyte salt, where the non-aqueous solvent includes ethylene carbonate (EC), and a weight content of the EC in the non-aqueous solvent is denoted by x, based on a total weight of the non-aqueous solvent; the electrolyte salt includes a first electrolyte salt represented by formula (1) and a second electrolyte salt represented by formula (2), and a weight content of the first electrolyte salt in the electrolyte is denoted by y, and a weight content of the second electrolyte salt is denoted by z, based on a total weight of the electrolyte; R1 and R2 each independently include a fluorine atom or a C1-C6 fluoroalkyl group, R3 includes a fluorine atom or a C1-C6 fluoroalkyl group, and M1 and M2 each independently include one or more of Li, Na, and K; where 5%?x?25%, 0.75?x/y?5, and 120?x/z?3000.

Abstract: The present application discloses an electrolyte solution for a lithium secondary battery, a secondary battery, and an electrical device. The electrolyte solution for a lithium secondary battery includes a sulfate and fluorosulfonate ions, and a molar ratio of the sulfate to the fluorosulfonate ions is (8-223):1.

Abstract: A secondary battery and an electrical apparatus are described. The secondary battery of the present application comprises an electrolyte solution; the electrolyte solution comprises a solvent and an additive; the solvent comprises ethylene carbonate; the additive comprises 1,3-propane sultone and fluoroethylene carbonate; the percentage mass content of the ethylene carbonate in the electrolyte solution is x %, the percentage mass content of the 1,3-propane sultone in the electrolyte solution is y %, and the percentage mass content of the fluoroethylene carbonate in the electrolyte solution is z %; and the x, the y, and the z satisfy: 10?x/y?950 and 2?x/z?10.

Abstract: A lithium-ion secondary battery and an electric apparatus are provided. The lithium-ion secondary battery includes an electrolyte. The electrolyte includes alkali metal ions having an ionic radius greater than a radius of lithium ions and a film-forming additive. Based on a total mass of the electrolyte, a mass percentage A of the alkali metal ions and a mass percentage B of the additive satisfy 0.10?B/A?6×104.

Abstract: Provided are a non-aqueous electrolyte and a preparation method thereof, and a secondary battery and an electric apparatus containing the same. The non-aqueous electrolyte contains a non-aqueous solvent and lithium ions, first cations, and first anions dissolved therein, where the first cation is a metal cation Men+ other than the lithium ion, n representing a chemical valence of the metal cation; the first anion is a difluorooxalate borate anion DFOB?; mass concentration of the first cations in the non-aqueous electrolyte is D1 ppm, and mass concentration of the first anions in the non-aqueous electrolyte is D2 ppm, both based on total mass of the non-aqueous electrolyte; and the non-aqueous electrolyte satisfies that D1 is 0.5 to 870 and that D1/D2 is 0.02 to 2. The non-aqueous electrolyte in this application enables the secondary battery to have good cycling performance, safety performance, and kinetic performance.

Abstract: A battery pack includes at least a first battery cell and a second battery cell. The battery pack includes a region A and a region B. The region A is a region of a low thermal insulation capability and is located on all sides and/or at a bottom of the battery pack. A remaining region is the region B. A percentage of a number of the first battery cells among battery cells in the region A is 10% to 100%. A percentage of a number of the second battery cells among battery cells in the region B is 5% to 100%.

Abstract: This application relates to a lithium-ion battery, a battery, and an electric apparatus. The lithium-ion battery includes an electrolyte and a positive electrode plate. The electrolyte includes lithium salt, the lithium salt includes lithium hexafluorophosphate, and a mass proportion of the lithium hexafluorophosphate relative to a total mass of the electrolyte is 15% to 20%. The positive electrode plate includes a positive electrode current collector and a positive electrode film layer disposed on at least one side of the positive electrode current collector and containing a positive electrode active material. This application can improve cycling performance of the lithium-ion battery.

Abstract: The present application discloses an electrolyte solution, a battery and an electrical device. The electrolyte solution includes a first additive, a second additive and a third additive. The first additive includes a sulfate ester compound. The second additive includes: where Z1-Z4 each independently include an oxygen atom or a sulfur atom. The third additive includes at least one of fluorosulfonate, tetrafluoroborate, difluorophosphate, difluoro(oxalato)borate, bis(oxalato)borate and difluorobis(oxalato)phosphate. Based on the total mass of the electrolyte solution, content W1 of the first additive, content W2 of the second additive and content W3 of the third additive satisfy W1:W2:W3=1:(0.1-1.5):(0.02-2.5).

Abstract: A battery and an electrical apparatus. The battery includes a positive electrode plate and an electrolyte solution, in which, the positive electrode plate includes LixNi(1-y-z)CoyMzO2-b, and M includes at least one element from Mn, Al, Fe, Ti, Mg, Cr, Ga, Cu, Zn, Nb and Zr, 0<x?1.2, 0.18?y?0.25, 0?z?0.2, 1?y?z?0.55, and 0?b?0.2; and the electrolyte solution includes a nitrile compound, and based on the total mass of the electrolyte solution, the content of cyano groups in the electrolyte solution is w %, w>0, and 0.04?y/w?0.4.

Abstract: The present application provides a secondary battery and an electrical apparatus. The secondary battery includes a battery case having an accommodating cavity, a cell assembly disposed in the accommodating cavity, and an electrolyte. The electrolyte contains a chain carboxylate compound, where based on the total mass of the electrolyte, a mass percentage W of the chain carboxylate compound satisfies: 0.03?W/R?7. The secondary battery has excellent fast charge performance and long service life.