Abstract: A secondary battery includes a non-aqueous electrolyte. The non-aqueous electrolyte includes: fluoroethyl propionate, where the fluoroethyl propionate is selected from the group consisting of 2,2-difluoroethyl propanoate, 2,2,2-trifluoroethyl propionate, and a combination thereof, and based on a total mass of the non-aqueous electrolyte, a mass percentage of the fluoroethyl propionate is 5% to 65%; and ethylene carbonate (EC) and propylene carbonate (PC), where based on the total mass of the non-aqueous electrolyte, the sum of the mass percentages of the ethylene carbonate (EC) and the propylene carbonate (PC) is less than or equal to 15%.

Abstract: A non-aqueous electrolyte includes a first substance and a second substance. The first substance includes at least one of dimethyl carbonate or ethyl acetate. Based on total mass of the non-aqueous electrolyte, a mass percentage of the first substance is M1%, where 50?M1?70. The second substance includes at least one of succinonitrile, glutaronitrile, or adiponitrile. Based on the total mass of the non-aqueous electrolyte, the mass percentage of the second substance is M2%, where 0.01?M2?3.

Abstract: A non-aqueous electrolyte includes chain carbonates and cyclic carbonates, where the chain carbonates include dimethyl carbonate, ethyl methyl carbonate, and diethyl carbonate, and the cyclic carbonates include at least one of ethylene carbonate and propylene carbonate; and based on a total mass of the non-aqueous electrolyte, a mass percentage of dimethyl carbonate is M1%, where 0.001?M1?0.1; a mass percentage of ethyl methyl carbonate is M2%, where 15?M2?60; a mass percentage of diethyl carbonate is M3%, where 5?M3?35; a mass percentage of ethylene carbonate is M4%, a mass percentage of propylene carbonate is M5%, and 20?M4+M5?40.

Abstract: An electrochemical device includes a positive electrode, a negative electrode, a separator, and an electrolyte. The positive electrode includes a positive active material. The positive active material includes aluminum. Based on a mass of the positive active material, a mass percentage of the aluminum is x %. The electrolyte includes carboxylate and fluoroethylene carbonate. Based on a mass of the electrolyte a mass percentage of the carboxylate is m %, and a mass percentage of the fluoroethylene carbonate is n %. The electrochemical device satisfies: (1) x falls within a range of 0.01 to 1.00; and (2) 0.3?m/n?55, and preferably 5?m/n?16.

Abstract: An electrochemical device includes a negative electrode and an electrolyte, where the negative electrode includes a negative electrode current collector and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector. The negative electrode current collector contains chromium, wherein based on a mass of the negative electrode current collector, a mass percentage of chromium is from 0.001% to 0.5%. The electrolyte includes an oxalate-based compound, where based on a mass of the electrolyte, a mass percentage of the oxalate-based compound is from 0.01% to 5%; and the oxalate-based compound includes at least one of a compound of formula I, a compound of formula II, a compound of formula III, a compound of formula IV, or a compound of formula V.

Abstract: An electrolyte including a compound of Formula I-A, a compound of Formula I-B, and a compound of Formula I-C: where based on a mass of the electrolyte, a percentage of the compound of Formula I-A ranges from 0.12% to 5.0%; a percentage of the compound of Formula I-B ranges from 0.12% to 5.0%; and a percentage of the compound of Formula I-C ranges from 0.12% to 3.0%.

Abstract: An electrochemical device including a positive electrode, a negative electrode and an electrolyte, wherein the negative electrode comprises a negative electrode active material layer, including a negative electrode active material, wherein the negative electrode active material includes a silicon-containing compound; and the negative electrode active material further includes, on the surface, a protective layer including a compound having an S?O bond.

Abstract: An electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator. The positive electrode plate includes a positive electrode current collector, a first positive electrode active material layer, and a second positive electrode active material layer. The negative electrode plate includes a negative electrode current collector, a first negative electrode active material layer, and a second negative electrode active material layer. The electrode assembly includes a flat region and a bent region. The negative electrode plate includes a first bent section and a second bent section. The positive electrode plate includes a third bent section. The first bent section, the third bent section, and the second bent section are sequentially disposed away from a winding center.

Abstract: An electrochemical apparatus including an electrode assembly, where the electrode assembly includes a positive electrode, a negative electrode, and tabs, and the tabs extend out of a housing in a first direction. A positive electrode active substance layer has a first positive electrode active substance layer side and a second positive electrode active substance layer side opposite to the first positive electrode active substance layer side in the first direction. A negative electrode active substance layer has a first negative electrode active substance layer side and a second negative electrode active substance layer side opposite to the first negative electrode active substance layer side in the first direction. The tabs includes a positive tab and a negative tab, the positive tab is provided at the first positive electrode active substance layer side and the negative tab is provided at the first negative electrode active substance layer side.

Abstract: An electrochemical device includes a positive electrode plate and an electrolyte. The electrolyte includes a compound represented by Formula I: where a is an integer from 1 to 5, the compound represented by Formula I contains at least 4 fluorine atoms, based on a total mass of the electrolyte, a mass percentage of the compound represented by Formula I in the electrolyte is A %, and 7?A?72. The positive electrode plate includes a positive current collector, a first material layer and a second material layer, the first material layer is disposed between the positive current collector and the second material layer, a coating mass of the first material layer is x mg over an area of 1540.25 mm2, a coating mass of the second material layer is y mg over an area of 1540.25 mm2, and 15.4?y/x?2530.

Abstract: An electrolyte includes diglycolic anhydride and a trinitrile compound, with which the cycle performance and the high-temperature stability under over-discharge conditions of lithium-ion batteries are significantly improved. The electrolyte includes a compound of Formula I; and at least one of a compound of Formula II or a compound of Formula III; R1, R2, R3 and R4 are each independently selected from hydrogen, halo, substituted or unsubstituted C1-C10 alkyl, substituted or unsubstituted C2-C10 alkenyl, substituted or unsubstituted C2-C10 alkynyl, substituted or unsubstituted C6-C12 aryl, substituted or unsubstituted C1-C10 alkoxy, or substituted or unsubstituted C6-C12 aryloxy, wherein when substituted, the substituent is halo, cyano, or C1-C10 alkyl; and a, d and f are each independently selected from an integer from 1 to 5, and b, c, e, g, h and i are each independently selected from an integer from 0 to 5.

Abstract: An electrochemical apparatus includes a positive electrode, a negative electrode, a separator, and an electrolyte. The electrolyte includes a diluent, an electrolytic salt, and a compound of formula III. The diluent is selected from a group consisting of a compound of formula I and a compound of formula II. A molar mass of the diluent is Mz, and based on a total weight of the electrolyte, a percentage of the diluent is z wt %; a molar mass of the electrolytic salt is Mx, and based on the total weight of the electrolyte, a percentage of the electrolytic salt is x wt %; and a molar mass of the compound of formula III is My, and based on the total weight of the electrolyte, a percentage of the compound of formula III is y wt %, satisfying: 0.4 : 1 ? y M ? y : x M ? x ? 4 : 1 ; and z M ? z y M ? y + x M ? x ? 1.5 .

Abstract: An electrolyte includes fluoroethylene carbonate, where a percentage a of the fluoroethylene carbonate is 0.01% to 5% based on mass of the electrolyte; the positive electrode includes a positive electrode active material, where the positive electrode active material contains element Mn, and a percentage of the element Mn is greater than or equal to 15% based on mass of the positive electrode active material; and the positive electrode active material has a unit reaction area c measured in m2/cm2, where a and c satisfy the following relationship: 0.0006?a/c?6.25, and the unit reaction area is a product of a weight W of the positive electrode active material per unit area and a specific surface area BET of the positive electrode active material.

Abstract: An electrochemical apparatus includes a positive electrode and an electrolyte. The electrolyte includes ethylene carbonate (EC), propylene carbonate (PC), and succinonitrile (SN). The positive electrode includes a positive electrode active material, where the positive electrode active material includes metal element A, and the metal element A includes at least one of the following elements: Mg, Zr, or Al. Based on a mass of the electrolyte, a mass percentage of SN is a %, a mass percentage of EC is b %, and a mass percentage of PC is c %, where k=b/c, 1.25?k?6, and a/k?0.2. Based on a mass of the positive electrode active material, a mass percentage of the metal element A is x %, where 0.01?x?1. The foregoing electrochemical apparatus exhibits excellent high-temperature cycling performance and high-temperature interval cycling performance.

Abstract: An electrochemical device includes a positive electrode, a negative electrode, a separator located between the positive electrode and the negative electrode, and an electrolytic solution. The positive electrode includes a positive current collector and a positive active material layer disposed on the positive current collector. The positive active material layer includes a positive active material. The positive active material includes an element A. The element A is selected from at least one of Al, B, Ca, Mg, Ti, Cu, Nb, Si, Zr, Y, or W. The electrolytic solution includes at least one of 1,3-propane sultone or a derivative thereof. A mass ratio of the element A in the positive active material to 1,3-propane sultone or a derivative is 1:0.2 to 1:50.

Abstract: An electrolytic solution includes a compound containing a —CN functional group and a compound containing a silicon functional group. M is C or Si. R11, R12, and R13 are each independently selected from a substituted or non-substituted C1-C12 alkylene group, a substituted or non-substituted C2-C12 alkenylene group, an O—R group, an R0—S—R group or an R0—O—R group, R0 and R are each independently selected from a substituted or non-substituted C1-C6 alkylene group. n is 0 or 1. R14 is H, fluorine, a cyano group, a substituted or non-substituted C1-C12 alkyl group, a substituted or non-substituted C2-C12 alkenyl group, an O—R1 group, an R0—S—R1 group, or an R0—O—R1 group. R0 is a substituted or non-substituted C1-C6 alkylene group, and R1 is a substituted or non-substituted C1-C6 alkyl group.

Abstract: An electrochemical apparatus, including a positive electrode, a negative electrode, an separator, and an electrolyte, wherein the positive electrode comprises a current collector and a positive active material layer, and the positive active material layer comprises a positive active material; and the electrolyte comprises a compound of Formula I: wherein R11, R12, R13, R14, R15 and R16 are each independently selected from: H, halogen, and the following substituted or unsubstituted groups: a C1-8 alkyl group, a C2-8 alkenyl group, a C2-8 alkynyl group, or a C6-12 aryl group; and an amount of the compound of Formula I required per 1 g of the positive active material is about 0.001 g to about 0.064 g. The present application can effectively improve high-temperature storage and high-temperature cycle performance of an electrochemical apparatus.

Abstract: The present application relates to an electrolyte and an electrochemical device including the same. The electrolyte includes a diboronic acid compound and a nitrile compound, so that the storage performance and cycle performance of the electrochemical device using the electrolyte can be remarkably improved.

Abstract: An electrochemical device includes a negative electrode and an electrolyte solution. The negative electrode includes a negative current collector and a negative electrode mixture layer. The negative electrode mixture layer includes a first section, a second section, and a third section arranged sequentially in a thickness direction. The first section, the second section, and the third section are of an identical thickness. A ratio of a porosity P1 of the first section to a porosity P2 of the third section is P. The electrolyte solution includes an additive A, which is at least one selected from a compound of Formula I or a compound of Formula II: Based on a total mass of the electrolyte solution, a mass percent of the additive A is w %, satisfying 1?w?60, P=P1/P2, and P/(w %+1)?50%.

Abstract: An electrolyte including an imidazolium salt compound and a pyridine compound. The electrolyte, includes a compound of Formula I and a compound of Formula II: where R1 is selected from halo, cyano, substituted or unsubstituted C1-C12 alkyl, substituted or unsubstituted C2-C12 alkenyl, substituted or unsubstituted C2-C12 alkynyl, substituted or unsubstituted C2-C12 alkoxy, substituted or unsubstituted C3-C12 cycloalkyl, and substituted or unsubstituted C6-C12 aryl; and R11, R12, R13, R14 and R15 are each independently selected from H, halo, cyano, substituted or unsubstituted C1-C12 alkyl, substituted or unsubstituted C2-C12 alkenyl, substituted or unsubstituted C2-C12 alkynyl, substituted or unsubstituted C2-C12 alkoxy, substituted or unsubstituted C3-C12 cycloalkyl, and substituted or unsubstituted C6-C12 aryl; when substituted, the substituent is halo or cyano.