CATHODE MATERIAL USING ACTIVE PARTICLES IN A VISCOSITY-CONTROLLED PASTE,CATHODE USING THIS MATERIAL, AND LITHIUM-ION SECONDARY BATTERY USING THIS CATHODE

摘要

A cathode material for a lithium-ion secondary batteryincluding: active material particles including central particlesrepresented by general formula LixAyDzPO4 (here, A representsat least one element selected from the group consisting of Co,Mn, Ni, Fe, Cu, and Cr, D represents at least one element selectedfrom the group consisting of Mg, Ca, Sr, Ba, Ti, Zn, B, Al, Ga,In, Si, Ge, Sc, and Y, 0.9x1.1, 0y=1, 0=z1, and 0.9y+z1.1)and a carbonaceous film that coats surfaces of the centralparticles, wherein, when a mixture of the active materialparticles, a conductive auxiliary agent and a binder in whicha mixing ratio thereof is 94:1:5 in terms of a mass ratio isdissolved in a solvent to form paste having a total solid contentamount of 45% by mass, a viscosity of the past is 5,000 mPa.cndot.sor less at a shear rate of 4.0 [1/s] .