MODIFIED PHENOLIC HYDROXYL GROUP-CONTAINING RESIN FOR SECONDARY BATTERY NEGATIVE ELECTRODE, CARBON MATERIAL FOR SECONDARY BATTERY NEGATIVE ELECTRODE, SECONDARY BATTERY NEGATIVE ELECTRODE ACTIVE SUBSTANCE, SECOND BATTERY NEGATIVE ELECTRODE, AND SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a modified phenolic hydroxyl group-containing resin for a secondary battery negative electrode, from which a secondary battery negative electrode carbon material capable of improving charge/discharge efficiency can be produced.SOLUTION: The modified phenolic hydroxyl group-containing resin for secondary battery negative electrode has a hydroxyl equivalent of 115 g/eq or more, in which a negative electrode active substance essentially comprising hard carbon is produced by calcining the above resin at 550°C in a nitrogen atmosphere to obtain a carbon material precursor, and then calcining the precursor at 1,200°C in a nitrogen atmosphere.EFFECT: The carbon material thus produced has an effect of suppressing increase in an electric resistance by charging/discharging of a lithium ion battery.SELECTED DRAWING: Figure 1