Sanyo SEB-013SEB-013 Manganese Dioxide Primary Lithium Batteries (CR, 〔Principles and Structure of Primary Lithium Batteries〕, ■Battery Structure

Primary Lithium Batteries

Manganese Dioxide Primary Lithium Batteries (CR

Sanyo manganese dioxide primary lithium batteries, developed in 1976, feature high energy density. Because they offer many unique features not found in either convetional dry cells or silver oxide batteries, Sanyo lithium batteries are currently used in a wide range of equipment such as electronic calculators, watches and cameras. In addition, they are used as a memory backup power source in microcomputer-controlled devices. By offering a wide range of lithium batteries, from coin cells to high-power cylindrical type cells (spiral structure) and high-capacity cylindrical type cells (bobbin structure), Sanyo has been able to meet the demands of a large and diversified market.

Sanyo is acquiring International Regulation ISO9001 approval which is a quality guarantee. Sanyo continues to implement thorough quality control.

〔Principles and Structure of Primary Lithium Batteries〕

Applying an original manufacturing process, Sanyo uses a manganese dioxide compound as the active material for the positive electrode (cathode). Lithium is used for the negative electrode (anode) to produce a cell with high voltage and high energy density. In addition, an organic electrolyte is employed to which lithium salts are added.

The discharge reaction of lithium batteries is as follows:

●Anode reaction: Li→Li＋＋e－

●Cathode reaction: MnⅣO2＋Li＋＋e－→MnⅢO2 (Li＋)

●Overall battery reaction: MnⅣO2＋Li→MnⅢO2 (Li＋)

The cell voltage is approximately 3V.

■Battery Structure

High-power cylindrical type lithium batteries are capable of producing a very high discharge current due to their spiral electrode structure. High-capacity cylindrical type lithium batteries have a bobbin structure which contains active material and can provide a high capacity.

In addition, the laser sealing technology ensures long-term reliability and a battery life of up to 10 years at room temperature.

Coin Type Primary Lithium Batteries (crimp-sealing)

negative cap	anode (lithium)
	separator＋electrolyte
	gasket
	cathode (MnO2)
	positive can

Cylindrical Type Primary Lithium Batteries

High-power (spiral structure)				High-capacity (bobbin structure)
Crimp-sealing		Laser-sealing			Laser-sealing
positive cap with safety vent	PTC device	negative cap	gasket	negative cap	gasket
		laser-sealed section			laser-sealed section
	gasket
			positive tab		negative current collector
	positive tab		negative tab
	anode (lithium)
					cathode (MnO2)
separator＋electrolyte			cathode (MnO2)
					separator＋electrolyte
		separator＋electrolyte
	cathode (MnO2)
			anode (lithium)		anode (lithium)
	insulator plate
			insulator sheet		positive can
negative tab	negative can	positive can with safety

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