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CN104781959B 负极活性物质、其制备方法和锂二次电池 有权

负极活性物质、其制备方法和锂二次电池
Abstract:
本发明涉及一种负极活性物质，其作为锂二次电池用负极活性物质在性能方面是优异的，其包含当对进行至少一次充电后的硅氧化物进行硅的固态NMR(29Si‑DDMAS)测定时满足以下式1和式2的硅氧化物；(式1)0.42≤S1/(S1+S2+S3)≤0.55(式2)0.21≤S3/(S1+S2+S3)≤0.26，其中S1为归属于具有Si‑Si键且具有在0ppm～‑15ppm、‑55ppm、‑84ppm和‑88ppm处的峰的Si的一组信号的峰面积的总和，S2为归属于具有Si(OH)4‑n(OSi)n(n＝3，4)结构且具有在‑100ppm和‑120ppm处的峰的Si的一组信号的峰面积的总和，S3为归属于具有Si(OLi)4‑n(OSi)n(n＝0，1，2，3)结构且具有在‑66ppm、‑74ppm、‑85ppm和‑96ppm处的峰的Si的一组信号的峰面积的总和。
Abstract(English):

A negative electrode active material comprising silicon oxide satisfying the following Equation 1 and Equation 2 when solid state NMR ( 29 Si-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 ‰¤ S �¢ 1 / S �¢ 1 + S �¢ 2 + S �¢ 3 ‰¤ 0.55 0.21 ‰¤ S �¢ 3 / S �¢ 1 + S �¢ 2 + S �¢ 3 ‰¤ 0.26 , 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.

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