Abstract: This disclosure provides a composite positive electrode material and a preparation method and application thereof. The method includes the following steps: (1) mixing a first lithium source, a manganese source, an iron source, and a phosphorus source with a solvent to obtain a lithium manganese iron phosphate precursor, performing thermal treatment on the lithium manganese iron phosphate to obtain lithium manganese iron phosphate powder, mixing a nickel cobalt manganese hydroxide with a second lithium source, and performing sintering treatment to obtain a nickel-cobalt-lithium manganese oxide positive electrode material; (2) mixing the lithium manganese iron phosphate powder and lithium nickel cobalt manganese oxide positive electrode material obtained in step (1) with a metal-organic framework (MOF) material, and stirring to obtain mixed powder; and (3) performing calcination treatment on the mixed powder obtained in step (2) to obtain the composite positive electrode material.

Abstract: Provided in the present application is an electrolyte and lithium-ion battery, the electrolyte including a fluorosultones compound as shown in Formula 1. The electrolyte prepared in the present application is applied to lithium iron manganese phosphate batteries, which effectively suppresses the dissolution of manganese in lithium iron manganese phosphate materials, and significantly improves the high-temperature storage performance and high-temperature cycling performance of the batteries.

Abstract: Provided in the present application is an electrolyte and lithium-ion battery. The electrolyte includes a compound as shown in formula 1, in which R1 is selected from any one of C1-C6 fully or partially substituted fluoroalkyl, and R2 and R3 are independently selected from any one of a hydrogen atom, an alkane, a phenyl, an alkylbenzene, or a methoxysilane respectively.

Abstract: A modified lithium manganese iron phosphate positive electrode material and a preparation method and an application thereof are provided. The modified lithium manganese iron phosphate positive electrode material includes a doped lithium manganese iron phosphate core; and a coating layer disposed on a surface of the doped lithium manganese iron phosphate core. The doped lithium manganese iron phosphate core comprises an Nb element, and the coating layer comprises LiNbO3 and Nb2O5.

Abstract: The present invention discloses a lithium battery, which comprises of a positive electrode plate, a negative electrode current collector substrate, a separator and electrolyte between the positive electrode plate and the negative electrode current collector substrate. The positive electrode plate comprises a positive electrode collector, a positive electrode active material-containing positive electrode layer attached to the positive electrode collector and positive electrode tab welded to the positive electrode collector. The negative electrode current collector substrate comprises a negative electrode current collector and negative electrode tab welded to the negative electrode current collector. The negative electrode current collector substrate is a current collector substrate with 6˜60 ?m thickness having a planar or concavo-convex structure which is made from metal foil material or metal mesh with 6˜25 ?m thickness.

Abstract: The present invention discloses a lithium battery, which comprises of a positive electrode plate, a negative electrode current collector substrate, a separator and electrolyte between the positive electrode plate and the negative electrode current collector substrate. The positive electrode plate comprises a positive electrode collector, a positive electrode active material-containing positive electrode layer attached to the positive electrode collector and positive electrode tab welded to the positive electrode collector. The negative electrode current collector substrate comprises a negative electrode current collector and negative electrode tab welded to the negative electrode current collector. The negative electrode current collector substrate is a current collector substrate with 6˜60 ?m thickness having a planar or concavo-convex structure which is made from metal foil material or metal mesh with 6˜25 ?m thickness.