| abstract |
The invention provides a negative electrode active material for a secondary battery and a manufacturing method thereof, which have excellent charge-discharge capacity and cycle characteristics with improved capacity retention. The present invention relates to a negative electrode active material for a lithium ion secondary battery and a manufacturing method thereof. The negative electrode active material is formed by containing silicon oxide represented by the general formula SiOxHy (1<x<1.8, 0.01<y<0.4), which is suitable for The hydrogen silsesquioxane polymer obtained by performing condensation reaction after hydrolyzing the Si compound represented by formula (1) is obtained by heat-treating under an inert gas environment, contains Si, O and H, and in the infrared spectrum, 820cm- Ratio I 1 /I 2 of intensity I 1 of peak 1 originating from Si-H between 1 and 920 cm-1 to intensity I 2 of peak 2 originating in Si-O-Si between 1000 cm -1 and 1200 cm -1 in the range of 0.01 to 0.35. HSi(R) 3 (1) (wherein, R is a group selected from hydrogen, an alkoxy group having 1 to 10 carbons, and the like). |