3results about How to "High Capacity Features" patented technology

The application discloses a preparation method of a polyanionic sodium ion battery positive electrode material, and comprises the following steps: S1, preparation of a precursor solution: a transition metal M source, an acid solution and a complexing agent are mixed and dissolved to form a precursor solution; S2, preparation of a pre-oxidized precursor solution: an oxidizing agent is added to the solution to generate a pre-oxidized precursor solution; S3, preparation of M(OH)x precipitation: a pH value of the pre-oxidized precursor solution is adjusted so that transition metal ions in the solution are precipitated in the form of M(OH)x; S4, preparation of a precursor powder: the M(OH)x precipitation, a sodium source, a phosphorus source and a carbon source are mixed wetly to obtain a precursor slurry; S5, drying of the precursor powder: the precursor slurry is dried and separated to obtain a dried precursor powder; and S6, high-temperature sintering: the precursor powder is sintered at a high temperature to obtain a polyanionic material. The polyanionic sodium ion battery positive electrode material has the characteristics of excellent electrochemical performance, high compaction density and low cost.

The present invention relates to a method for activating a lithium secondary battery comprising a positive electrode, a negative electrode, and an electrolyte, in which the lithium secondary battery comprises a positive electrode active material made of a lithium metal oxide containing manganese in an amount of 50 mol% or more but less than 100 mol% based on the total metal content excluding lithium, the method includes activating the lithium secondary battery by a CC-CV charging method in which constant current (CC) charging is performed until a specified state of charge (% SOC) is reached, and then constant voltage (CV) charging is performed, in which the CC-CV charging of the activation step ends at a point in time at which an activation charging depth defined by the following mathematical formula 1 becomes 5.17% to 15.00%, [Mathematical formula 1] Depth of charge for activation (%) = (charge capacity for CV charge interval / total charge capacity for activation step) * 100.