Sanyo SEB-013SEB-013 Continued Backup Over One Year, Manganese Dioxide Rechargeable Lithium Batteries (ML series), ■Applications, Battery Structure, ■Battery Structure

Rechargeable Lithium Batteries

Manganese Dioxide Rechargeable Lithium Batteries (ML series)

Sanyo manganese dioxide rechargeable lithium batteries are high-capacity rechargeable coin-type batteries. These batteries have a high voltage of 3V compared to Ni-Cd button cells (1.2V). With a low self-discharge rate and superior charge/discharge cycle characteristics, they have an expected life of as much as 5 years at room temperature. They are suitable for use as memory backup power sources and can also be used in combination with solar cells.

〔Principles and Structure of Coin Type Manganese Dioxide Rechargeable Lithium Batteries〕

Manganese dioxide, with proven performance, is used as the active material for the positive electrode through Sanyo's developedtreatment. The active material in the negative electrode, lithium aluminum alloy, offers stable cyclic performance with a high discharge voltage.

The electrolyte is made by dissolving lithium salts in a mixed organic solvent. The charge/discharge reaction of the batteries is as follows:

	→		＋	＋e	－
● Anode reaction: (Li－AR)←AR＋Li
Ⅳ		＋	－→		Ⅲ	＋	)
● Cathode reaction: Mn	O2＋Li		＋e ←Mn			O2 (Li
	Ⅳ					→ Ⅲ		O2	＋	)＋AR
● Overall battery reaction: Mn		O2＋(Li－AR)←Mn							(Li

The cell voltage is approximately 3V.

■When the batteries are used with a contact system

●Use nickel-plated phosphor bronze or stainless steel for terminal materials to make contact with the batteries.

●For stable contact conditions, several N of contact pressure are recommended for the contact.

■Battery Structure

negative cap	negative current collector
	anode (Li－AR)
	separator＋electrolyte
	gasket
	cathode (MnO2)
	positive can

■Applications

●Memory backup power sources for computer, MD and portable cellular phones including PHS.

●Power source for portable equipment.

●Hybrid power source when combined with solar cells

●Memory backup power source for electronic equipment.

〔Features of Coin Type Manganese Dioxide Rechargeable Lithium Batteries〕

Continued Backup Over One Year

The ML2430, for example, offers one year back up under continuous discharge of 10μA at 23℃ when the battery is fully charged or when the battery capacity is the same as the shipment.

Stable Operating Voltage of 2.5V

Sanyo rechargeable lithium batteries offer a high discharge voltage of 2.5V, more than twice that of Ni-Cd button cells. So a single lithium battery can be used to replace two conventional batteries. They also offer a stable voltage over a long period, unlike the straight-line voltage drop of capacitors.

●Discharge

	3.5
	3.0
(V)	2.5
voltage
	2.0
cell
	1.5
	0

						ML2430
					load : 10μA
					temp: 23℃
					fully charged
			for shipment
100	200	300		400		500
	discharge time in days

11