Lithium Batteries

Niobium Rechargeable Lithium Batteries (NBL series)

Sanyo niobium rechargeable lithium batteries are high-capacity coin-type batteries that can be recharged at 2.0V. These batteries are specially designed for use with low-voltage equipment. Similarly with the ML- series manganese dioxide rechargeable lithium batteries, the NBL-series features a low self-discharge rate, thus offering an expected life of 5 years at room temperature. These batteries are optimized for use as memory backup power sources and can also be used in combination with solar cells.

〔Principles and Structure of Coin Type Niobium Rechargeable Lithium Batteries〕

These batteries use niobium pentoxide as the active material for the positive electrode by employing Sanyo's original treatmentprocess. In turn, the active material for the negative electrode is made from lithium aluminum alloy. This allows stable cyclic performance to be maintained at a low 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: ● Anode reaction: (Li－AR)←AR＋Li

＋e

 

 

 

 

 

 

 

Ⅴ

＋

 

－→

Ⅳ

(2Li

＋

)

 

 

● Cathode reaction: Nb 2O5＋2Li

＋2e ←Nb 2O5

 

 

 

Ⅴ

 

 

 

→

Ⅳ

2O5 (2Li

＋

)＋2AR

● Overall battery reaction: Nb

2O5＋2(Li－AR)←Nb

 

The cell voltage is approximately 2V.

Rechargeable

■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 (Nb2O5)

 

positive can

■Applications

●Memory backup power sources for pagers 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 Niobium Rechargeable Lithium Batteries〕

Stable Operating Voltage of 1.2V

With a discharge voltage of 1.2V, Sanyo niobium rechargeable lithium batteries maintain stable voltage characteristics over a prolonged period.

Charge/Discharge Characteristics

The NBL621 can withstand 3,000 cycles under discharge conditions of 0.2mAh (discharge depth of 5%)

Wide Operating Temperature Range

The use of an organic electrolyte gives an extended operating temperature range: －20℃ to ＋60℃.

Charging Possible with 1.8V

Even a charging voltage as low as 1.8V ensures high charge efficiency.

Small Self-Discharge Rate Assures Durability

● Discharge

 

 

 

 

 

 

 

 

NBL621

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

load

:

 

～

 

 

 

 

 

 

 

 

100kΩ（＝13μA）

 

 

 

 

 

 

 

temp: 23℃

 

 

(V)

2.0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

voltagecell

1.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

fully charged

 

1.0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

for shipment

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

100

200

300

400

 

 

 

 

 

discharge time in hours

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Greater Safety (UL approved)

The self-discharge rate of approx. 2% per year at room

Since Sanyo niobium rechargeable lithium batteries do not

temperature is much lower than that of Ni-Cd button cells. Even

contain toxic materials, noxious liquids or gases, they pose no

after five years of storage at room temperature, you can expect

major pollution problems. They are UL recognized components

about 90% of the original capacity.

(File No. MH12383).

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