METHOD FOR MANUFACTURING NEGATIVE ELECTRODE MATERIAL FOR LITHIUM ION SECONDARY BATTERY, AND NEGATIVE ELECTRODE MATERIAL FOR LITHIUM ION SECONDARY BATTERY

To provide a method for manufacturing a negative electrode material for a lithium ion secondary battery capable of manufacturing a negative electrode for a lithium ion secondary battery excellent in input characteristics, output characteristics, high temperature storage characteristics and initial efficiency.SOLUTION: A method for manufacturing a negative electrode material for a lithium ion secondary battery includes a step of preparing an activated carbonaceous substance A that has been treated to increase the BET specific surface area by 2% to 50% with respect to a carbonaceous substance A, a step of mixing the activated carbonaceous substance A with a carbonaceous substance precursor that is a source of the carbonaceous substance B different from the carbonaceous substance A, and a step of heat-treating the mixture to obtain a fired product.SELECTED DRAWING: None 【課題】入力特性、出力特性、高温保存特性及び初期効率に優れるリチウムイオン二次電池用負極を製造可能なリチウムイオン二次電池用負極材の製造方法を提供する。【解決手段】リチウムイオン二次電池用負極材の製造方法は、炭素性物質Ａに対してＢＥＴ比表面積を２％〜５０％増加させる処理を施した賦活化炭素性物質Ａを準備する工程と、前記賦活化炭素性物質Ａと、前記炭素性物質Ａとは異なる炭素性物質Ｂの元となる炭素性物質前駆体とを混合して混合物を得る工程と、前記混合物を熱処理して焼成物を得る工程と、を有する。【選択図】なし