METHOD OF PREDICTING CYCLE LIFE OF SECONDARY BATTERY COMPRISING CARBON BASED HYBRID NEGATIVE ELECTRODE

• Main Authors: YOON, HYO-JUNG, KIM, SO-YOUNG, SUNG, KI-WON, LEE, EUN-JU
• Format: Patent
• Language: English; Polish
• Published: 10.06.2024
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; TESTING

Disclosed is a method of predicting cycle life of a secondary battery comprising a carbon-based hybrid negative electrode, comprising: measuring a lattice d-spacing of a carbon based negative electrode active material of a target carbon-based hybrid negative electrode using an X-ray diffractometer during charging/discharging of a target secondary battery comprising the target carbon-based hybrid negative electrode comprising a carbon based negative electrode active material and a non-carbon based negative electrode active material, and plotting a graph of changes in lattice d-spacing value as a function of charge/discharge capacity (X axis); calculating a target slope difference corresponding to a difference in slope value changed with respect to an inflection point of the graph during discharging in the plotted graph; comparing the target slope difference with a reference slope difference corresponding to a difference in the slope value changed with respect to an inflection point in a graph showing changes in lattice d-spacing value as a function of charge/discharge capacity (X axis) of a reference secondary battery; and predicting if the cycle life of the target secondary battery is improved compared to the reference secondary battery from a result of the comparison.