Abstract: This application provides 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 the 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 tetrafluoroborate anion BF4?; 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 0.1 to 1250 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: This application provides a positive electrode active material. Surface of a first lithium salt is coated with a coating layer containing a second lithium salt, which not only blocks the corrosive decomposition of the first lithium salt by the electrolyte but also allows the second lithium salt to form CEI films in situ on surfaces of the first lithium salt particles, thereby improving the film structure and avoiding the decomposition of active components in the electrolyte. Additionally, the second lithium salt contains both elements fluorine and phosphorus, which makes the composition of the film formed as consistent as possible with the composition of the film formed by lithium hexafluorophosphate in the electrolyte, thereby reducing the consumption of active lithium in the electrolyte. The positive electrode active material of this application can significantly improve the power performance and cycle life of batteries.

Abstract: The present application provides a secondary battery and an apparatus containing the same. The secondary battery includes: a negative electrode plate including a negative electrode current collector and a negative electrode film disposed on at least one surface of the negative electrode current collector, the negative electrode film including a negative active material; and an electrolyte including an electrolyte salt, an organic solvent, and an additive; wherein the negative active material includes a silicon-based material; the additive includes an additive A and an additive B; the additive A is selected from one or more of the compounds shown in Formula 1; the additive B is selected from one or more in the compound shown in Formula 2; the additive B has melting point of below or equal to 5° C.

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: Provided are a lithium-ion battery, a battery module, a battery pack, and an electrical apparatus. The lithium-ion battery provided in the present application comprises one or more of additives shown in formula (I) in its electrolyte solution, and a ratio of a percentage mass content W0 of the additives shown in formula (I) in the electrolyte solution to a specific surface area X1 of a negative electrode active material in the negative electrode active material layer of the lithium-ion battery satisfies W0/X1=0.1?10. The additives shown in formula (I) are first reduced to a film on a surface of a negative electrode of the lithium-ion battery.

Abstract: A non-aqueous electrolyte and a secondary battery, a battery module, a battery pack and an electrical device containing the same. The non-aqueous electrolyte includes an electrolyte salt, a non-aqueous solvent, and a first additive, wherein the electrolyte salt includes lithium bis(fluorosulfonyl)imide, lithium tetrafluoroborate, and lithium difluoro(oxalate)borate, and wherein the first additive includes fluoroethylene carbonate, and wherein based on the total mass of the non-aqueous electrolyte, lithium bis(fluorosulfonyl)imide is present in a mass content of A1, lithium tetrafluoroborate is present in a mass content of A2, lithium difluoro(oxalate)borate is present in a mass content of A3, fluoroethylene carbonate is present in a mass content of B1. The secondary battery simultaneously has good cycling performance, storage performance, hot box safety performance and kinetic performance.

Abstract: A secondary battery, a battery module, a battery pack and an electrical device containing the same are described. The secondary battery comprises a positive electrode plate, a negative electrode plate, and a non-aqueous electrolyte, wherein the non-aqueous electrolyte comprises a compound shown in Formula 1, based on the total mass of the non-aqueous electrolyte, the compound shown in Formula 1 is present in an amount of A1% by mass; the negative electrode collector has a thickness of H1 ?m, the negative active material layer has a compaction density of P1 g/cm3, and the secondary battery satisfies: H1 is from 3 to 7, A1/H1 is from 0.003 to 0.40 and P1/A1 is from 1 to 90. The secondary battery with a thinned negative electrode collector has low cost, high energy density, high power performance and high safety performance at the same time.

Abstract: A secondary battery includes a positive electrode plate and a non-aqueous electrolyte. The non-aqueous electrolyte includes a compound shown in Formula 1. Based on a total mass of the non-aqueous electrolyte, the compound shown in Formula 1 is present in an amount of A1% by mass. The positive electrode collector has a thickness of H ?m. The positive active material layer has an elongation at break of Q %. the positive active material layer has a compaction density of P g/cm3. The secondary battery satisfies: H is from 4 to 14, A1/H is from 0.0015 to 0.20, Q+/A1 is from 1 to 4, and P/A1 is from 2 to 340.

Abstract: A secondary battery may comprise an electrolyte solution and a positive electrode plate, wherein the positive electrode plate may comprise a layered material with a molecular formula of LiaNibCocM1dM2eOfAg, M1, M2, A, a, b, c, d, e, f, and g being as defined herein respectively; and the electrolyte solution may comprise lithium difluoro(oxalato)borate, based on the total mass of the electrolyte solution, the percentage mass content of the lithium difluoro(oxalato)borate being x %, with 0<x?1.0, and the secondary battery satisfies c+x/10?0.10.

Abstract: A secondary battery and a battery module, a battery pack, and an electric apparatus containing the secondary battery are provided. The secondary battery includes a positive electrode plate and an electrolyte. The positive electrode plate includes a positive electrode current collector and a positive electrode film layer arranged on at least one surface of the positive electrode current collector, and the positive electrode film layer includes one or more of olivine-structured lithium-containing phosphate and its modified compound. The electrolyte includes an organic solvent, and the organic solvent includes a first solvent represented by Formula 1. R11 and R12 in Formula 1 each are independently one of C1-C4 alkyl and C1-C4 haloalkyl. The secondary battery satisfies: mass of first solvent/rated capacity of secondary battery is ?0.7 g/Ah; and mass of electrolyte/rated capacity of secondary battery is ?3.5 g/Ah.

Abstract: A secondary battery, including a positive electrode, a negative electrode, a separator sandwiched between the positive electrode and the negative electrode, and an electrolyte are provided. In some embodiments, the positive electrode includes a positive electrode current collector having two main surfaces, the negative electrode includes a negative electrode current collector having two main surfaces, and at least one of the positive electrode current collector and the negative electrode current collector includes at least one recess structure extending from at least one main surface into interior of the current collector, where the recess structure has a recess depth h1 in microns, the electrolyte has a conductivity ? in Siemens/meter, and numerically, ? and h1 satisfy the following relationship: 8tanhh1+0.2h1???10tanh(h1)2+2+0.1h1. This application further provides a battery module including the foregoing secondary battery, a battery pack, and an electric apparatus.

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: A secondary battery includes an electrolyte solution and a positive electrode plate. The positive electrode plate includes a layered material with a molecular formula of LiaNibCocM1dM2eOfAg, where M1, M2, A, a, b, c, d, e, f, and g are defined herein. The electrolyte solution includes a compound including a phosphorus-oxygen double bond that includes one or more of lithium difluorophosphate, diethyl (2-cyanoethyl)phosphonate, tripropyl phosphoric anhydride, diethyl acetyl phosphate, and triphenyl phosphate. Based on a total mass of the electrolyte solution, a percentage mass content x % of the compound including a phosphorus-oxygen double bond satisfies 0<x?1.0. The secondary battery satisfies c+x/10?0.10.

Abstract: The present application discloses a lithium-ion battery, which has a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte solution comprising a lithium salt and a solvent, wherein based on the total weight of the electrolyte solution, the percentage by mass of the lithium salt in the electrolyte solution is a %, and the lithium ion battery satisfies 5?a?10; and the load on single side of the negative electrode sheet is W grams per 1540.25 mm2, and a and W satisfy 25?a/W?50; and the solvent comprises dimethyl carbonate. The lithium ion battery has good safety and high-temperature cycling performance, and also has good kinetic performance.

Abstract: The present application provides an electrolyte solution, a secondary battery and a power consuming device. The electrolyte solution may contain a solvent, an additive and a lithium salt. The solvent may include a first solvent and a second solvent, the first solvent being a cyclic ester solvent, and the second solvent being a linear carboxylic ester solvent. The additive may include a film forming additive. Based on the total mass of the electrolyte solution, the lithium salt may have a mass fraction of W1, the film forming additive may have a mass fraction of W2, and the second solvent may have a mass fraction of W3, which may satisfy the following relationship: 0.2?(W1+W2)/W3?0.4.

Abstract: The application provides a secondary battery and a device including the same. The second battery includes: a negative electrode plate, the negative electrode plate including a negative active material; a separation film, the separation film including a base material and a coating arranged on at least one surface of the base material; and an electrolyte, the electrolyte including an organic solvent, where the negative active material includes a silicon-based material and a carbon material; thickness of the base material of the separation film is 7 ?m˜12 ?m; and the organic solvent includes ethylene carbonate, and a weight ratio of the ethylene carbonate in the organic solvent is ?20%. The secondary battery and the device including the same, which are provided by the application, in the premise of having high energy density, can also have good high-temperature cycle performance, good high-temperature storage performance, and low low-temperature direct current resistance.

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: A secondary battery, including a positive electrode, a negative electrode, a separator sandwiched between the positive electrode and the negative electrode, and an electrolyte are provided. In some embodiments, the positive electrode includes a positive electrode current collector having two main surfaces, the negative electrode includes a negative electrode current collector having two main surfaces, and at least one of the positive electrode current collector and the negative electrode current collector includes at least one recess structure extending from at least one main surface into interior of the current collector, where the recess structure has a recess depth h1 in microns, the electrolyte has a conductivity ? in Siemens/meter, and numerically, ? and h1 satisfy the following relationship: 8tanhh1+0.2h1???10tanh(h1)2+2+0.1h1. This application further provides a battery module including the foregoing secondary battery, a battery pack, and an electric apparatus.

Abstract: A secondary battery, and a battery module, a battery pack, and an electric apparatus containing the same are provided. The secondary battery includes: an electrolyte having a specific percentage of a low-viscosity solvent, a specific percentage of a high-dielectric-constant solvent, and a negative electrode having a negative electrode active material layer, and the secondary battery satisfies the relational expression: 1 × 10 - 4 ? 4 ? B × C × P ? OI × CW ? 1 × 10 - 3 where B is the percentage of the low-viscosity solvent in total solvent in the electrolyte by mass; C is a percentage of an electrolyte salt in the electrolyte by mass; P is a porosity of the negative electrode active material layer; CW is a coating weight of the negative electrode active material layer, measured in mg/cm2; and OI is an orientation index of the negative electrode active material layer.

Abstract: 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, R1 and R2 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, R3, R4, and R5 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.