Page 165 - Handbook of Battery Materials

134 4 Electrochemistry of Manganese Oxides

4.2.5
Discharge Tests for Battery Materials
Testing various battery materials (MnO 2 ,MH, LiCoO 2 , etc.) requires a simple
and repeatable electrochemical test using 0.1–0.5 g of sample. Kozawa proposed
a plastic cell test [4] using a 100 mg MnO 2 sample mixed with a large amount of
graphite and discharging it at 1.0 mA. This method provides reproducible results for
open-circuit voltage (OCV), closed-circuit voltage (CCV), polarization, and capacity

Table 4.5 Composition and application of TABS available.

Teflon Acetylene black Surfactant Applications a
(%) (%) (%)

TAB-1 34 66 0 Gas-diffusion electrodes
TAB-2 33 66 1 Lithium battery electrodes
TAB-3 32 64 4 Aqueous battery electrodes

a
All three are available for research, in 100 g bag, from ITE, Aichi. Japan (Fax: (81)
586-81-1988).

100 mg sample TAB + sample
(MnO 2 , MH alloy etc) +
TAB (20, 30 or 40 mg)

(1) (2)
4 tons
(coated with
epoxy and
wrapped with
Teflon tape) steel block
(C) P.P. separator
(B) TAB + sample
Ni, Ti, or (A) metal screen
Stainless steel steel block
screen
(3) (4)
Figure 4.9 Procedure for the preparation of (2) the mixtureismadeintoa thin filmby
the test electrode for aqueous electrolytes grinding with a pestle in a ceramic mortar;
(9 mol L −1 KOH or ZnCl 2 solution). (1) The (3) the metal screen is prepared; and (4) the
sample is mixed by shaking in a plastic con- three layers (A, B, C) are pressed between
tainer 20 mm (diam.) × 40 mm (height); the steel blocks.