Mesoporous electrodes for electrochemical cells
An electrode, double-layer electrode technology, applied in the field of electrochemical cells
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Examples
Embodiment 1
[0043] This example serves to illustrate a cell with a relatively "flat" voltage profile, high volumetric charge storage capacity to electrode thickness ratio outside the range considered optimal by the prior art. The composition of the battery is shown in Table 1.
[0044] Table 1
[0045]
Ni electrode
thickness of
(μm)
C electrode
thickness of
(μm)
electrode body
Product ratio
(C:Ni)
Ni electrode capacity
(F / cc)
(at 2092mA / cm 3
under test)
C electrode capacity
(F / cc)
(at 2092mA / cm 3
under test)
Compare
Rate
20
250
12.5∶1
1635
106
15.4
[0046] Preparation of nickel-cobalt electrodes
[0047] Preparation of Liquid Crystal Mixtures
[0048] Novel mesoporous nickel-cobalt electrodes were fabricated by electrodepositing thin films on bare nickel substrates using liquid crystal surfactant templat...
Embodiment 2
[0066] Embodiment 2 (comparative example)
[0067] This example is used to illustrate a battery using an electrode thickness ratio outside the range claimed by the present invention.
[0068] The experimental details for preparing the battery are the same as in Example 1, except that the mesoporous positive electrode and the carbon negative electrode are relatively thin. The composition of the battery is shown in Table 2.
[0069] Table 2
[0070]
Ni electrode
thickness of
(μm)
C electrode
thickness of
(μm)
Volume ratio
(C:Ni)
Ni electrode capacity
(F / cc)
(at 2092mA / cm 3
under test)
C electrode capacity
(F / cc)
(at 2092mA / cm 3
under test)
Compare
Rate
10
80
8∶1
1635
62
26.3
[0071] After charging at 6mA, make the battery charge at 4984mA / cm 3 A constant current discharge was carrie...
Embodiment 3
[0073] Embodiment 3 (comparative example)
[0074] thick nickel electrodes
[0075] This example is used to illustrate the performance of the battery whose electrode volume ratio is within the optimum range considered by the prior art but within a range different from Example 2.
[0076] Here, a bi-cell structure in which two carbon electrodes are provided on both sides of a central nickel electrode is used. The thickness of the electrodes is listed in Table 3.
[0077] The nickel electrodes chosen were commercially available, but otherwise the cells were assembled and tested the same as in Examples 1 and 2, except that they were discharged at slightly different current densities (4986 mA / cm 3 ) under.
[0078] table 3
[0079]
Ni electrode
thickness of
(μm)
C electrode
thickness of
(μm)
Volume ratio
(C:Ni)
Ni electrode capacity
(F / cc)
(at 2092mA / cm 3
under test)
C ...
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