公开(公告)号：US20160285091A1

公开(公告)日：2016-09-29

申请号：US14442141

申请日：2013-10-28

Applicant: NEC CORPORATION

Inventor： Jiro IRIYAMA ,  Daisuke KAWASAKI ,  Emiko FUJII ,  Shin SERIZAWA ,  Hiroo TAKAHASHI

IPC: H01M4/485 ,  H01M4/04 ,  H01M10/0525

CPC classification number: H01M4/485 ,  H01M4/0445 ,  H01M4/0459 ,  H01M4/1391 ,  H01M10/0525 ,  H01M2004/027

Abstract: A negative electrode active material comprising silicon oxide satisfying the following Equation 1 and Equation 2 when solid state NMR (29Si-DDMAS) of silicon is measured for the silicon oxide after performing charging at least once is excellent in the performance as a negative electrode active material for a lithium secondary battery; 0.42≦S1/(S1+S2+S3)≦0.55  (Equation 1) 0.21≦S3/(S1+S2+S3)≦0.26,  (Equation 2) in which S1 is a sum of peak areas of a group of signals assigned to Si having a Si—Si bond and having peaks at 0 to −15 ppm, −55 ppm, −84 ppm and −88 ppm, S2 is a sum of peak areas of a group of signals assigned to Si having a Si(OH)4-n(OSi)n (n=3, 4) structure and having peaks at −100 ppm and −120 ppm, and S3 is a sum of peak areas of a group of signals assigned to Si having a Si(OLi)4-n(OSi)n (n=0, 1, 2, 3) structure and having peaks at −66 ppm, −74 ppm, −85 ppm and −96 ppm.

Abstract translation: 其中S1是分配给具有Si-Si键的Si并且在0至-15ppm，-55ppm，-84ppm和-88ppm具有峰值的一组信号的峰值面积之和，S2是 分配给具有Si（OH）4-n（OSi）n（n = 3,4）结构并在-100ppm和-120ppm具有峰值的Si的一组信号的峰值面积，S3是峰值 分配给具有Si（OLi）4-n（OSi）n（n = 0,1,2,3）结构并具有在-66ppm，-74ppm，-85ppm的峰和 -96ppm。