| abstract |
The present invention provides a kind of cathode size compositions, it comprises binding resin, water-soluble polymer and negative electrode active material, wherein, described binding resin comprise gel content be 70～98% and Measurement of Dynamic Viscoelasticity in (A) styrene-butadiene-copolymer latex that glass transition temperature is 30 DEG C～60 DEG C and gel content be 70～98% and Measurement of Dynamic Viscoelasticity in (B) acrylic polymer latex that glass transition temperature is 100 DEG C～0 DEG C, described negative electrode active material comprises carbon system active substance and silicon system active substance. |