Porous carbon having connecting mesopores and electrode
AssigneeRicoh Company, Ltd.
InventorsNaoto Abe, Yoshio Itoh, Tatsuya Dan, Yuka Araki, Shuhei Takeshita
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Abstract
To provide a non-aqueous electrolyte electricity-storage element including a positive electrode including a positive-electrode active material capable of inserting and releasing anions, a negative electrode including a negative-electrode active material capable of inserting and releasing cations, and a non-aqueous electrolyte, wherein the positive-electrode active material is porous carbon having pores having a three-dimensional network structure, and wherein a changing rate of a cross-sectional thickness of a positive electrode film including the positive-electrode active material defined by Formula (1) below is less than 45%.
Claims6
An electrode film comprising a porous carbon having connecting mesopores which have a three-dimensional network structure,
- wherein a changing rate of a cross-sectional thickness of the electrode film including the porous carbon is less than 45%,
- wherein the changing rate of the cross-sectional thickness is measured by:
- mixing the porous carbon, acetylene black, an acrylate-based latex, and carboxymethyl cellulose in a mass ratio of the porous carbon, the acetylene black, the acrylate-based latex, and the carboxymethyl cellulose based on each of solid contents is 100:7.5:3.0:9.5, to obtain a mixture;
- adding water to the mixture to obtain a slurry;
- applying the slurry onto one side of an aluminum foil;
- drying the applied slurry;
- cutting the dried slurry into a circle having a diameter of 16 mm to obtain the electrode film;
- and measuring the changing rate of the cross-sectional thickness defined by Formula (1),
- Changing
-
-
- rate
-
-
- of
- cross
-
- -
-
- sectional
-
-
- thickness
-
-
- (
- %
- )
- =
- Film
-
-
- thickness
-
-
- after
-
-
- charge
-
- -
-
- discharge
- -
- Film
-
-
- thickness
-
-
- before
-
-
- charge
-
- -
-
- discharge
- Film
-
-
- thickness
-
-
- before
-
-
- charge
-
- -
-
- discharge
- ×
- 100
- ,
- Formula
-
-
- (
- 1
- )
- wherein the charge-discharge in the Formula (1) is 50 cycles charge-discharge where charge is performed with cut-off voltage of 4.5V and discharge is performed with cut-off voltage of 1.5V.
Dependencies are inferred from the claim text.