Preparation method of ultralow-temperature long-cycle-life lithium vanadium phosphate battery

• Main Authors: XU DANJUN, LI WEI
• Format: Patent
• Language: Chinese; English
• Published: 23.09.2022
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention discloses a preparation method of an ultralow-temperature long-cycle-life lithium vanadium phosphate battery, which comprises the following steps: (1) mixing polyvinylidene fluoride, oily graphene and lithium vanadium phosphate with N-methyl pyrrolidone to obtain positive electrode slurry; wherein the mass ratio of the polyvinylidene fluoride to the oily graphene to the lithium vanadium phosphate is (3.0 to 5.5): (1.5 to 2.5): (92.0 to 95.5); (2) mixing sodium carboxymethyl cellulose, a binder, a conductive agent and lithium titanate with deionized water to obtain negative electrode slurry; wherein the mass ratio of the sodium carboxymethyl cellulose to the binder to the conductive agent to the lithium titanate is (1.0-2.0): (3.5-4.5): (2-3.5): (90.0-93.5); and (3) respectively coating and rolling the positive and negative electrode slurry to obtain a positive plate and a negative plate, and carrying out die cutting, powder brushing, combined winding with a diaphragm, packaging and the like to o