Slurry containing dispersed acetylene black, and lithium-ion secondary battery

4:

• The slurry according to claim 1, wherein the dispersion medium comprises N-methyl-2-pyrrolidone.

5:

• The slurry according to claim 1, further comprising:
• a dispersibility imparting agent.

6:

• The slurry according to claim 5, wherein the dispersibility imparting agent comprises a nonionic polymer resin.

7:

• The slurry according to claim 6, wherein the nonionic polymer resin comprises a cellulose-type polymer or a butyral-type polymer.

8:

• The slurry according to claim 6, wherein the nonionic polymer resin has a weight average molecular weight of 1,000 to 1,000,000.

9:

• The slurry according to claim 8, wherein the nonionic polymer resin has a weight average molecular weight of 5,000 to 300,000.

11:

• A lithium ion secondary battery, comprising:
• a positive electrode of lithium ion secondary battery obtained by the method according to claim 10.

12:

• A method of producing an acetylene black-dispersed slurry, comprising:
• dispersing acetylene black in a dispersion medium such that a content of the acetylene black in the acetylene black-dispersed slurry is from 10% by mass to 30% by mass,
• wherein the dispersing comprises controlling at least one of (i) a shear rate at which a viscosity becomes a minimum value, (ii) a viscosity measured by a B-type viscometer, and (iii) a concentration dependence of admittance and a phase difference obtained from an alternating current impedance measurement.

13:

• The method according to claim 12, wherein the dispersing is conducted until the viscosity measured by a B-type viscometer falls within a range of from 100 mPa·s to 5,000 mPa·s.

14:

• The method according to claim 12, wherein the dispersing is conducted until the shear rate at which the viscosity becomes a minimum value falls within a range of from 100 to 1,000 s−1.

15:

• The method according to claim 12, wherein the dispersing is conducted until the concentration dependence of admittance reaches 1.0 μS/mass % or less, and the phase difference falls within a range of from 5° to 20°, at the impressed frequency of 1,000 Hz, as obtained by the alternating current impedance measurement.

17:

• A lithium ion secondary battery, comprising:
• a positive electrode of lithium ion secondary battery obtained by the method according to claim 16.

20:

• A method of producing the slurry according to claim 1, comprising:
• dispersing the acetylene black in the dispersion medium such that the acetylene black is included in the slurry in an amount of from 10% by mass to 30% by mass,
• wherein the dispersing comprises controlling the viscosity measured by a B-type viscometer to be in a range of from 100 mPa·s to 5,000 mPa·s.