Positive Electrode Precursor

Abstract

This positive electrode precursor includes: a positive electrode active material containing a carbon material and an alkali metal compound, wherein 5≤A≤35, when A (g/m 2 ) is a weight of the alkali metal compound in the positive electrode active material layer at one surface of the positive electrode precursor, 10≤B≤100 as well as 0.20≤A/B≤1.00, when B (g/m 2 ) is a weight of the positive electrode active material in the positive electrode active material layer, and 1≤C≤20, when C (m 2 /cm 2 ) is a specific surface area per unit area as measured by the BET method at one surface of the positive electrode precursor.

What is claimed is: 
     
         1 . A nonaqueous hybrid capacitor comprising an electrode laminated body,
 wherein the electrode laminated body comprises:
 a positive electrode precursor; 
 a negative electrode; and 
 a separator, 
   wherein the positive electrode precursor comprises:
 a positive electrode active material containing a carbon material; and 
 an alkali metal compound, 
   wherein the positive electrode precursor has one surface and another surface, and a positive electrode active material layer is present at the one surface or both the one surface and the other of the positive electrode precursor,   wherein 5≤A≤35, when A (g/m 2 ) is a weight of the alkali metal compound in the positive electrode active material layer at the one surface of the positive electrode precursor,   wherein 10≤B≤100 as well as 0.20≤A/B≤1.00, when B (g/m 2 ) is a weight of the positive electrode active material in the positive electrode active material layer,   wherein 1≤C≤20, when C (m 2 /cm 2 ) is a specific surface area measured by the BET method using nitrogen as an adsorbate at the one surface of the positive electrode precursor per unit area of the one surface of the positive electrode precursor,   wherein A/G 1  is equal to or larger than 1.0 (g/Ah) and equal to or smaller than 2.0 (g/Ah), when G 1  (Ah/m 2 ) is a Capacitance Per Unit Area of the One Surface of the Negative electrode.   
     
     
         2 . The nonaqueous hybrid capacitor according to  claim 1 , wherein A/G 1  is equal to or larger than 1.49 g/Ah and equal to or smaller than 1.91 g/Ah. 
     
     
         3 . The nonaqueous hybrid capacitor according to  claim 1 , wherein 0.116≤C/B≤0.5. 
     
     
         4 . The nonaqueous hybrid capacitor according to  claim 1 , wherein the separator includes a polyolefin film. 
     
     
         5 . The nonaqueous hybrid capacitor according to  claim 4 , wherein the polyolefin film includes polyethylene or polypropylene. 
     
     
         6 . The nonaqueous hybrid capacitor according to  claim 1 , wherein the alkali metal compound is at least one selected from the group consisting of an alkali metal carbonate salt, lithium oxide, and lithium hydroxide. 
     
     
         7 . The nonaqueous hybrid capacitor according to  claim 1 , wherein 5≤X≤50, when X % by weight is a weight ratio of the alkali metal compound in the positive electrode active material layer of the positive electrode precursor, and
 wherein 5≤S 1 ≤60, and 0.50≤S 1 /X≤2.00, when S 1 % is an area of oxygen mapping whose luminance values are binarized based on the average luminance value in the oxygen mapping of the one surface of the positive electrode precursor measured by a scanning electron microscope—an energy-dispersive X-ray spectroscopy (SEM-EDX). 
 
     
     
         8 . The nonaqueous hybrid capacitor according to  claim 7 , wherein 5≤S 2 ≤60, and 0.50≤S 2 /X≤2.00, when S 2 % is an area of oxygen mapping whose luminance values are binarized based on the average luminance value in the oxygen mapping obtained by SEM-EDX measurement of a cross section of the positive electrode precursor where the cross section is prepared by irradiating the positive electrode precursor with a broad ion beam (BIB). 
     
     
         9 . The nonaqueous hybrid capacitor according to  claim 1 , wherein 0.3≤D≤5.0 and 0.5≤E≤10 are satisfied, when D (μL/cm 2 ) is the mesopore volume of the positive electrode precursor per a unit area derived from fine pores having a diameter of equal to or larger than 20 Å and equal to or smaller than 500 Å of the one surface of the positive electrode precursor, the diameter is calculated by the BJH method at the one surface of the positive electrode precursor, and E (μL/cm 2 ) is the micropore volume per unit area derived from fine pores having a diameter of smaller than 20 Å, the volume of which is calculated by the MP method. 
     
     
         10 . The nonaqueous hybrid capacitor according to  claim 1 , wherein the alkali metal compound is in the form of particles, and the average particle diameter of the particles of the alkali metal compound is equal to or larger than 0.1 μm and equal to or smaller than 10 μm. 
     
     
         11 . A production method for the nonaqueous hybrid capacitor according to  claim 1 , comprising the following steps of:
 (1) a step of accommodating the electrode laminated body into a casing;   (2) a step of pouring into the casing a nonaqueous electrolytic solution containing electrolytes including lithium ions; and   (3) a step of decomposing the alkali metal compound by applying a voltage between the positive electrode precursor and the negative electrode, wherein the voltage is equal to or higher than 4.2 V.   
     
     
         12 . The production method for the nonaqueous hybrid capacitor, according to  claim 11 , wherein the nonaqueous electrolytic solution comprises:
 Lewis acid in an amount of equal to or more than 0.5% by weight and equal to or less than 5% by weight; and/or   a crown ether in an amount of equal to or more than 1.0% by weight and equal to or less than 10.0% by weight.   
     
     
         13 . A storage module comprising the nonaqueous hybrid capacitor according to  claim 1 .