Page 598 - Book Hosokawa Nanoparticle Technology Handbook

APPLICATIONS 36 DEVELOPMENT OF A HIGH-PERFORMANCE SECONDARY BATTERY

50
Gmax16kV/cm
Gmax14kV/cm
45 Gmax12kV/cm 1 Audible noise level (dB(A))
2 Super-hydrophilic
40
3 Hydrophilic
35 4 Hydrophobic
1
5 Super-hydrophobic
30
6 Contact angle (degree)
2
25
3 4 5

20 0 30 60 90 120 150 180
6

Figure 35.6
Experimental results.

method is titanium oxide thermal spraying, since even environment-compatible type that are not affected by
the characteristics can be maintained over a long the natural environment.
period of time due to the photocatalytic function and
a film having superior durability can be obtained, it is
considered to be excellent as a method of reducing References
audible noise in transmission lines.
Only about two water droplets are present per meter [1] Committee to Investigate Technology Countermeasures
on a titanium oxide thermal-sprayed power line, for Audible Noise and Aeolian Noise Overhead
which is smaller than the aged power line shown in Transmission Lines: Technology countermeasures for
Fig. 35.2. At present the super-hydrophilic power audible noise and aeolian noise in overhead transmis-
lines using titanium oxide are considered to be the sion lines, Institute of Electrical Engineers of Japan
surface improvement method superior in corona char- Technical Report, No. 976, 5–6, (2004).
acteristics and durability. [2] K. Miyajima, K. Tanabe: Reduction of audible noise by
Various parts are sometimes affixed to AC overhead super-water-repellent treatment of transmission line
transmission lines for the purpose of suppressing the surfaces: Trans. IEE Jpn., 121-B (1), 136–137 (2001)
wind roar of the lines during strong winds or of sup- (in Japanese).
pressing snow accumulation. However, these accumu-
late rainwater during rainfall and often cause increase [3] K. Tsujii: Super water- and oil-repellent surfaces result-
in the audible noise. We intend to suppress the audi- ing from fractal structure. Hyomen (Surface), 35 (12),
ble noise by carrying out surface improvement of 629–639 (1997) (in Japanese).
these fixtures other than the power lines, and to [4] A. Fujishima, K. Hashimoto and T. Watanabe: The
develop transmission lines of the completely Optical Clean Revolution, CMC, Tokyo, 8–12, (1997).

APPLICATION 36

36 DEVELOPMENT OF A HIGH-PERFORMANCE SECONDARY BATTERY BY
CONTROLLING THE SURFACE STRUCTURE

Since the electrochemical reaction takes place at the through various kinds of surface modification. There is
surface of the electrode active material, modification of considerable research relating to this concept and some
the surface of the electrode active material must have a research concerning improvements to the anodes and
significant effect on the battery performance and it cathodes of nickel hydrogen and lithium ion batteries by
would be possible to improve the electrode performance surface modification has been mentioned in this chapter.

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