| abstract |
Provided are a negative electrode active material for a secondary battery, having an excellent charging and discharging capacity and cycle performance in which a capacity retention ratio is improved, and a method for producing the same. The negative electrode active material for the lithium ion secondary battery contains silicon oxide that is obtained by heat-treating, under an inert gas atmosphere, a hydrogen silsesquioxane polymer (HPSQ) obtained by allowing hydrolysis of a silicon compound represented by formula (1) and then a condensation reaction of the resulting material, contains Si, O and H, and has, in an infrared spectrum, a ratio (I 1 /I 2 ) in the range of 0.01 to 0.35 with regard to intensity (I 1 ) of peak 1 at 820 to 920 cm -1 due to a Si-H bond to intensity (I 2 ) of peak 2 at 1000 to 1200 cm -1 due to a Si-O-Si bond, and is represented by general formula SiOxHy (1 < x < 1.8, 0.01 < y < 0.4): nHSi(R) 3 (1) nin which R is groups selected from hydrogen, alkoxy having 1 to 10 carbons and the like. |