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Primary Batteries For Rfid Applications}

Wednesday, April 26th, 2017

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Submitted by: Battery Love

Contour Energys primary batteries deliver world-class performance where it counts most. Power and energy density. Longevity. Durability. And service life. Now available in cylindrical and coin cell form factors rivaling the performance of leading name brands. From RFID to life-enhancing medical applications, Contour delivers the next-generation of portable power.

Over the last decade, Radio Frequency Identification (RFID) technology has gained popularity due to its application in tracking mobile objects besides providing a means for wireless data transmission without human intervention.Typical RFID applications include asset tracking, manufacturing, retailing, toll payment, wild-life tracking, security and access control.

What is RFID?

earth Primary Batteries for RFID Applications

In an RFID system, data that is transmitted by a mobile or portable device is received by a reader and then processed by the specific application. The device that transmits RFID data is known as an RFID tag or transponder. The data is transmitted as radio waves and it is unique to the tagged object such as product details, location of the object or its identification. The concept is similar to optically scanning a bar code label, except that in RFID the data is transmitted using radio waves.

RFID tags can be passive (without a battery) or active (powered by a battery). Passive RFID tags work well over small distances. Shops commonly use passive RFID tags in the form of stickers that are attached to merchandise to prevent shop lifting.

Battery powered RFID tags have advanced features and they can transmit and receive data over large distances. They are common in RFID applications where mobility is a requirement.

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cr2032 Primary Batteries for RFID Applications

RFID solutions use non-rechargeable batteries that are also known as primary batteries. The battery requirements for RFID depend on the power requirements of the application, the operating environment, portability, size, weight and battery cost.

The most significant battery characteristics to consider when comparing primary battery types for RFID are the specific energy, energy density, voltage across the battery terminals when it is at full capacity and not supplying any current (i.e., open circuit voltage), lifespan of the battery, its continuous and pulse current capacity and the temperature range in which the battery can operate.

Lithium has been the most popular choice of material for primary RFID batteries because it is very light, non-gaseous and has a high negative potential. Lithium batteries have the highest specific energy and energy density in comparison with other types of primary batteries. Additionally, lithium batteries have a very wide operating temperature range.

The most common primary lithium batteries used for RFID tags today are Lithium/Manganese Dioxide, Lithium/Thionyl chloride, Lithium/Polycarbon Monofluoride and Lithium/CFx.

Lithium/Manganese Dioxide (Li/MnO2)

The low cost Li/MnO2 batteries have an operating temperature range of -20C to 60C. They are environmentally safe, have a high energy density and an open circuit voltage of about 3V. These batteries can maintain a fairly constant discharge voltage and can be stored safely for 5-10 years as they have low self-discharge. Since the minimum operating voltage of the electronics in RFID tags is 3V, at least two Li/MnO2 cells must be connected in series to ensure reliable operation. This adds to the weight and cost of the RFID tag and also impacts its reliability.

Li/MnO2 batteries are not suitable for RFID applications that require spiral shaped cathodes, because the adjacent layers of the cathode can come in contact with each other in the event of shocks or vibrations, and render the battery unusable.

Lithium/Thionyl Chloride (Li/SOCl2)

Li/SOCl2 batteries have an operating temperature range between -55C to 150C, high pulse power capability and a long shelf life of 10 to 15 years. They have a high open circuit voltage of 3.6V. For most RFID tag applications a single Li/SOCl2 battery is sufficient as long as it can maintain the voltage above 3.0V. Additionally, Li/SOCl2 batteries can deliver low continuous current as well as moderate pulse currents that RFID tag applications require. However, this type of battery suffers from passivation, generates toxic waste and is unsafe because of pressure build up during sustained high discharge.

Passivation is the phenomenon in lithium batteries wherein a layer of lithium chloride forms on the surface of the lithium anode. This layer prevents the battery from self-discharging when it is unused. However, when this type of battery is used in a circuit, the layer of lithium chloride causes the battery voltage to dip before rising to a peak value and then stabilizing. The dip in battery voltage can significantly impact the performance of the RFID tag.

Lithium/Polycarbon Monofluoride (Li/(CF)n)

The energy density and operating temperature range of Li/(CF)n batteries is similar to that of Li/MnO2 batteries. Li/(CF)n batteries have a longer shelf life, are reliable, stable and relatively safe to operate. However, they perform poorly at lower or elevated temperatures.

Lithium/Carbon Fluoride (Li/CFx)

Advancements in lithium battery manufacturing technology have resulted in production of Lithium/Carbon Fluoride (Li/CFx) batteries that have higher energy densities, higher reliability and stability, wider operating temperatures and relatively low self discharge, and are environmentally friendly. Another major advantage of the Li/CFx battery is that it delivers higher power density and maximum safe current without the problems exhibited by the other types of lithium batteries.

coincells Primary Batteries for RFID Applications

More significantly, the cathode in the Li/CFx batteries developed by Contour can be customized to meet application specific requirements, thereby changing the batterys properties to deliver optimum performance in the context of the specific application.

This new technology will address many existing and emerging application requirements.

Tags: primary batteries,Lithium batteries,primary lithium batteries.

About the Author: Dongguan Large Electronic Co., Ltd is one of the biggest professional lithium battery application supplier in mainland China that always committed to serving industrial users.pls visit

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