ST EFL700A39 User Manual

EnFilm™ - rechargeable solid state lithium thin film battery

Features

■ All solid-state

■ Ultra thin

■ Fast recharge

■ Long cycle life

■ RoHS compliant

■ UL file number: MH47669

Applications

Device is intended to be used in following
applications:

■ Sensors and sensor networks

■ Smart card

■ RF ID tags

■ Energy storage for energy harvesting devices

■ Non implantable medical applications

■ Backup power

Description

The EFL700A39 is a thin film rechargeable lithium
battery. The battery has a LiCoO
LiPON ceramic electrolyte and a lithium anode.
This device has a footprint of 25.4 x 25.4 mm.

cathode,

2

EFL700A39

Datasheet − preliminary data

EnFilm

®

EFL700A39
700µAh/3V9

Table 1. Device summary

Symbol Value

Capacity 0.7 mAh

V

nominal

V

op

R

int

I

p

Dimension 25.4 x 25.4 mm

Thickness 200 µm

3.9 V

3.6 to 4.2 V

100 ohm

10 mA

TM: EnFilm is a trademark of STMicroelectronics

April 2012 Doc ID 17370 Rev 2 1/10

This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to
change without notice.

www.st.com

10

Characteristics EFL700A39

1 Characteristics

Table 2. Absolute ratings

Symbol Parameter Value Unit

V

T

T

C

1. Pulsing conditions: 100 ms on, 0.9 s off

2. 1/100 C discharge at -40 °C: operating at 60 °C reduces the cycle life

3. 1C discharge rate: 50% depth of discharge, cycle at room temperature

Table 3. Electrical characteristics

Operating voltage 3.6 – 4.2 V

op

I

Maximum continuous discharge current 5 mA

c

(2)

(1)

(3)

- 40 to 60 °C

1000 cycle

Maximum pulsed discharge current

I

p

Storage temperature range - 40 to 60 °C

stg

Operating temperature range

op

Cycle life (to minimum of 80% of initial capacity)

lfe

10 mA

Symbol Parameter Test conditions Min Typ Max Unit

T = 30 °C

C Nominal capacity (minimum)

Discharge @ 1 mA

0.7 - - mAh

Cut-off voltage = 3.6 V

R

Internal resistance T= 30 °C - 100 120 ohm

int

C

Charge time to 80% of full capacity Constant voltage= 4.2 V - - 20 mn

t

total self discharge
(recoverable and

Room temperature - - 18 %/year

non-recoverable)

Disch

Self
discharge

-- 5

% first

year

S

non-recoverable Room temperature

-- 15

% over

5 years

2/10 Doc ID 17370 Rev 2

EFL700A39 Characteristics

Figure 1. Typical discharge curve Figure 2. Typical pulsed discharge curve

Voltage(V)

Voltage(V)

4.2

4.1

4

3.9

3.8

3.7

3.6
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Discharge capacity(mAh)

Battery tested at 30 °C

70 µA
350 µA

0.7 mA
1mA

1.4 mA

3.5 mA
5 mA

4.5

4

3.5

3

2.5

2

Pulse conditions:
10 mA, 100 msec on 900 msec off, tested at 30 °C

Discharge capacity(mAh)

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9

0

1

Figure 3. Typical charge curve

Charge capacity (%)

100.0

90.0

80.0

70.0

60.0

50.0

40.0

30.0

20.0

10.0

0.0

10 20 30 40

Charge done at constant
voltage of 4.2 V at 30 °C

Charge time (min.)

1.1 1.2

Doc ID 17370 Rev 2 3/10