What is A Lithium Battery

Every day, millions of people rely on lithium-ion batteries to power their devices. From laptops and cell phones to hybrid and electric vehicles, this innovative technology has become an integral part of our daily lives. Lithium batteries are known for their high energy density and economy per cycle, setting them apart from other types of batteries. However, it is important to note that “lithium battery” is a vague term. There are six common lithium battery chemical components, each with advantages and disadvantages. In terms of renewable energy uses, lithium iron phosphate (LiFePO4) is the most commonly used chemical. This lithium battery has excellent safety features, including thermal stability, high current rating, long cycle life and abuse resistance.

Lithium-ion batteries are rechargeable (or secondary) lithium batteries. Lithium-ion batteries are a rapidly evolving field, with an increasing number of new products based on slightly different chemistries. At the same time, the actual construction methods have evolved, allowing for increased flexibility in shape and wording so that the battery cells can be bent without damage.

What is a Lithium Battery?

Lithium batteries are a type of rechargeable battery that utilizes the unique properties of lithium, the lightest of all metals. They have metallic lithium as an anode material, making them distinctly different from other batteries with high cost per unit and energy density. The principle of intercalation and deintercalation of lithium ions from a positive and negative electrode material is what makes a lithium battery operate, with the most popular type being the Lithium-ion battery. Lithium-ion batteries have become increasingly popular over the years because of their widespread use and high efficiency.

What Is the Difference Between Lithium and Lithium-Ion Batteries?

One key distinction between lithium cells and lithium-ion cells is that lithium-ion batteries can be recharged, whereas lithium batteries cannot. Lithium-ion cells can undergo charge and discharge cycles repeatedly, potentially up to thousands of times. In the event that these battery types are left unused and sitting on a shelf, lithium-ion batteries can maintain their lifespan for approximately two to three years, while lithium batteries can last up to 10 to 12 years.

Basic structure of a Lithium-Ion battery

At a very basic level a Lithium Ion battery is made up of:

An anode positive plate.
A cathode negative plate
A separator to ensure the plates do not touch but porous enough to allow chemical reactions between the two via an electrolyte solution

The above picture is for illustration only and it should be noted that the plates and separator are usually wound much tighter while the electrolyte is sometimes simply impregnated into the separator or can itself be a dry powder.

How Do Lithium-Ion Batteries Work?

As stated above, the separator in lithium batteries moves lithium ions from the cathode to the anode and vice versa through the electrolyte.

As the lithium ions move, it activates free electrons in the anode, which creates a charge at the positive current collector. Then, there is a flow of that electric current through the powered device (cell phones, laptops, etc.) to the negative current collector. The flow of electrons inside the battery is blocked by the separator.

When you plug in your electronic devices to charge, the cathode releases lithium ions and they are received by the anode to ensure the battery is recharged. While during the discharge process, lithium ions are released by the anode and received by the cathode, resulting in the generation of a flow of electrons from one end to the other.

Internal Components of a Li-ion Battery

If you dismantle a lithium battery (not recommended), you will see the following;

Li-ion cells: They can either be prismatic, cylindrical cells, or pouch cells (aka lithium polymer).
Battery Charge State Monitor: This is a small computer that controls the charging process of the battery.
Voltage tap: Tasked with monitoring the energy capacity of individual cells of the batteries.
Notebook Connector: Allows smooth flowing of information and power in and out of the battery.
Regulator Circuit and Voltage Converter: They maintain safe levels of current and voltage.
Temperature sensors: For monitoring the temperature of the battery.

What are Lithium Batteries Used for?

Manufacturers use lithium batteries to power a wide range of products and for varied applications. These include:

Portable consumer electronics: Products like smartphones, laptops, tablets, and other portable electronic devices take advantage of the most power density possible to reduce the volume taken up by these batteries.
Electric vehicles (EVs): Automakers almost exclusively use lithium-ion batteries in electric vehicles and manufacture these cells in the highest quantities—driving innovation. Cells in these applications require long life, stability, and the ability to charge as quickly as possible.
Renewable energy storage systems: These store energy from solar panels and wind turbines for use during peak demand times. It also allows for energy use when new energy creation isn’t possible (at night or when the wind dies down).
Portable medical devices: We see lots of lithium batteries used in pacemakers, hearing aids, and other medical devices where size is key. Batteries in these applications typically feature low self-discharge rates and long lifespans.
Aerospace: Lithium-ion batteries find ample use in spacecraft and satellites due to their high energy density and reliability.
Military and defense: Unmanned aerial vehicles utilize lithium batteries so they can run more quietly. We also see lithium batteries in night vision devices and portable communications equipment.

While we expect lithium batteries to continue to mature—and even get replaced by new materials and technology—they certainly power a wide variety of products that would not have been possible just a few decades ago.

Why Lithium-Ion Batteries Beat of the Technology?

Lithium-ion batteries have emerged as the preferred choice for several reasons. Firstly, they boast a superior energy and power density compared to their counterparts, pound for pound and inch for inch. For instance, imagine carrying a lead-acid-powered phone in your pocket! Additionally, heavy batteries are counterproductive for hybrid and fully electric cars. However, to achieve optimal performance, high-quality lithium cobalt oxide (or a similar alternative) is crucial.

Secondly, lithium batteries have a distinct advantage in that they can be recharged repeatedly with minimal memory effect. This means that their maximum energy capacity does not diminish over time like the NiCd or NiMH batteries. They can also charge faster and hold the charge for an extended period when not in use.

What Is the Difference Between a Lithium Battery and a Regular Battery?

Lithium-ion batteries may appear similar to regular batteries, but they differ in terms of safety and performance. These batteries have a higher energy density, allowing them to hold more energy in the same size as regular batteries. While this improves their performance, it can also create safety concerns if the stored energy is released explosively.

Moreover, lithium-ion batteries have a low self-discharge rate, which contributes to their longer battery life compared to other rechargeable batteries. Unlike regular batteries, lithium-ion batteries are rechargeable and suitable for use in portable electronic devices, such as MP3 players, digital cameras, and mobile phones, due to their high working voltage.

What are the Different Types of Lithium Batteries?

Electronics use lithium batteries, but they do not all use the same type because each device has a battery that is compatible with it.

We will be looking into six different types of lithium batteries. The many types of lithium batteries depend on chemical reactions and specific unique materials to store energy. The following are the lithium battery types we have;

Lithium Titanate: Unlike other chemistries, these batteries substitute the graphite in the anode with lithium titanate and utilize NMC or LMO as the cathode chemistry. This creates a battery that has a faster charging process and a longer life.
Lithium Nickel Cobalt Aluminum Oxide: These batteries have a long life cycle and deliver high specific energy with an appropriate specific power. Typically, they can maintain the delivery of large amounts of current for longer times.
Lithium Nickel Manganese Cobalt Oxide: This type of battery pack has three elements as its cathode materials (cobalt, manganese, and nickel). Manganese has a low specific energy, but it is extremely stable, while nickel has high specific energy but is not stable. So, the combination of these two creates stable chemistry with a high specific energy.
Lithium Manganese Oxide (LMO): This battery has lithium manganese oxide as its cathode material. With this chemistry, it is able to create a 3-d structure that increases current handling, lowers internal resistance, and bolsters ion flow, all while increasing thermal stability and safety.
Lithium Cobalt Oxide: The lithium cobalt oxide battery has low specific power and high specific energy. This implies that they can operate and deliver power for long periods but are limited when it comes to high-load applications.
Lithium Iron Phosphate: The lithium iron phosphate (lifepo4) battery utilizes a graphitic carbon electrode as the anode and phosphate as the cathode material. These batteries have longer-lasting life, good electrochemical performance, and thermal stability.

How Long Do Lithium Batteries Last?

Firstly, we will talk about how long the lithium cell can last on the shelf. There are various factors that impact the life of a Li-ion battery pack, including the charge state it was in, the battery temperature, and where it will be stored. However, there is a nice range for how long a li-ion battery can last. If you used the suggested guidelines to take care of your battery, it should have 2/3 years shelf life.

You can also keep some things in mind to help your li-ion batteries last longer. They include;

The lithium-ion chemistry doesn’t fancy a deep discharge; instead, it prefers a partial discharge. Among battery chemistries, lithium-ion chemistry is one of the best as it doesn’t have a memory effect, which means you don’t impact the battery efficiency with a partial discharge.
Since lithium-based batteries don’t age well with time, if you are buying a new battery, ensure it is really new so you can be sure of the energy capacity.
Ensure you keep the li-ion batteries away from heat as high temperatures are known to drain and harm the battery pack.

Do Lithium Batteries Last Longer Than Alkaline Batteries?

When it comes to rechargeable batteries, alkaline and li-ion batteries are two popular options. Alkaline batteries are known to lose some of their voltage with each recharge, while li-ion batteries have better durability and can outlast alkaline batteries for up to 10 cycles. Although alkaline batteries may be more cost-effective, they don’t last as long as li-ion batteries in use.

What Are the Benefits of Lithium Batteries?

Lithium-ion batteries are more widely used than other cells as they boast a fair number of salient advantages over their fellow technologies. These include:

They were developed to handle lots of charge and discharge cycles.
They are known to retain their charge. A lithium-ion battery pack has only a 5% loss of its charge each month, compared to the nickel-metal hydride (NiMH) batteries that loses about 20% of their charge monthly.
Generally, the lithium battery is lighter than other batteries of identical size. The reason they are this light is that their electrodes are made of lightweight carbon and lithium.
Lithium batteries have a remarkably high energy density – 150 watt-hours can be stored in just one kilogram of battery. In contrast, a lead-acid battery of the same weight can only store 25 watt-hours, meaning that it would take six kilograms of lead-acid technology to store the same amount of energy as a single kilogram of li-ion battery. Meanwhile, nickel-metal hydride (NiMH) battery packs can store around 70 watt-hours per kilogram of battery.

Do Lithium Batteries Have Any Disadvantages?

There are some risks and concerns with the li-ion batteries that everyone should be aware of;

There is a slight possibility that if it falls onto a solid surface with immense speed, it is likely to catch fire.
Discharging the li-ion battery completely could get it ruined.
High temperature is detrimental to its lifespan. Storing these batteries in hot temperatures would cause them to degrade at a quicker rate.
Their degradation starts immediately after they are shipped out of the factory. So, most lithium batteries are expected to last only two to three years from their date of manufacture.
There is a flammable electrolyte in these batteries capable of causing battery fires to occur on a small scale. This was seen in the Samsung Note 7, and it caused the manufacturers to stop further manufacturing and production.
Lithium batteries are not allowed on planes because there’s the possibility that they might produce bizarre heat levels and could lead to an inextinguishable fire. That’s the reason for the ban on li-ion batteries by aviation authorities.

Choose the Right Lithium Battery for Your Job

As you can see, there are many different types of lithium batteries. Each one has pros and cons and various specific applications they excel in. Your application, budget, safety tolerance, and power requirements will determine which lithium battery type is best for you.

Frequently Asked Questions

Can lithium batteries be used in place of alkaline?

Although lithium batteries are more costly, their higher voltage capacity makes them a superior option to traditional alkaline batteries in terms of performance.

Do lithium batteries ever leak?

There is no issue with storing lithium batteries as they do not leak. Lithium ignites when in contact with air or water. They are less likely to leak because off-gassing is not a problem for the liquid electrolyte present.

Do lithium batteries need ventilation?

Lithium batteries do not produce gas in a similar manner as other batteries, but to avoid thermal runaway, you need to give them proper ventilation.

What temperature do lithium-ion batteries explode?

It can be dangerous if a lithium battery is heated for a long time. Li-ion batteries have so much energy, and when they get hot, they vent the organic solvent used as electrolytes; this heat can cause them to explode and take the whole pack with it. Short circuits that happen when the battery terminals come in contact with metals can also lead to an explosion. Lithium batteries explode at 538 degrees.

How do you tell if a battery is alkaline or lithium?

Alkaline batteries are labeled with the code LR or words like “Alkaline.” The two-letter markings are common on button cells, and longer words are often found on bigger batteries. If you ever want to check the chemistry of a button cell battery, look for the standard code – C R for lithium and L R for alkaline.