Powering today's technology
Many consumer products on the market today use their lithium batteries as a selling point. Is this a real selling point? Are lithium-powered products really better than those using other battery types? The short answer to both questions is, yes, lithium batteries have great advantages and very few disadvantages compared to other battery types. Here we'll look at the pros and cons of lithium batteries and look at some of the products that have been improved by incorporating lithium technology.
What is a lithium battery?
Basically, a lithium battery is a battery that uses lithium ions as a key component of its electrochemistry. In a lithium battery, lithium atoms are ionized and separated from their electrons. The lithium ions then move from the anode through the electrolyte until they reach the cathode, where they reassemble with the electrons.
higher energy density
One of the biggest advantages of lithium batteries is that they have higher energy density than other rechargeable battery technologies. Energy density is the amount of energy stored in a given volume or weight, usually expressed as Wh/kg (Watt-hours per kilogram). Lithium-ion batteries currently in use have the highest energy density of all battery technologies, typically ranging from 100-265 Wh/kg. [1] Some of the latest lithium electric vehicle batteries under development have even higher energy densities, up to 315 Wh/kg, and can be charged to 80% in as little as 10 minutes. [2] In comparison, lead-acid batteries have an energy density of 30-50 Wh/kg, nickel-cadmium batteries have an energy density of 45-80 Wh/kg, and nickel-metal hydride batteries have an energy density of 60-120 Wh/kg. Kilogram. [3]
Lighter and more compact
Due to their higher energy density, lithium-ion batteries are lighter and more compact than other battery types. In fact, they make many of today's technologies feasible. Imagine if a smartphone weighed 10 pounds. (4.5 kg) instead of 6.07 oz. (172 grams) iPhone 14 weight. [4] Will they be as ubiquitous as they are now? Without small, lightweight lithium batteries, everyone's life would be very different. So if you've ever carried a battery-powered device in your pocket, purse, backpack, or glove box, this was possible in large part due to the development of lithium-ion batteries.
Ideal for high power applications
Lithium-ion battery technology also has advantages for high-power applications where the battery needs to deliver large amounts of current, such as jump-starting vehicles. Lithium-ion batteries can provide up to 3.6 volts, which is three times the voltage provided by nickel-cadmium or nickel-metal hydride batteries. [5]
Charges faster and lasts longer
If you want a device that charges quickly and holds a charge for months or years, look for one that's powered by a lithium battery. The chemistry of lithium-ion batteries allows them to receive electrical current at a faster rate, allowing them to charge much faster than other battery types. [6] For example, charging a lead-acid battery can take more than 10 hours, whereas a lithium battery can be charged in 3 hours or even minutes, depending on the size of the battery.
Over time, all types of batteries lose charge or self-discharge. However, lithium-ion batteries have an extremely low discharge rate of only 1.5% to 2% per month. By comparison, lead-acid batteries will lose about 5% of their charge in a month, while nickel-based batteries will lose 10% to 15% of their charge in the first 24 hours and 10% to 15% each month thereafter. power. [7] In practical terms, this means that if you charge a lithium battery pack and then store it in a drawer for the next year, the pack will retain 76% to 82% of its full charge by the end of the year.
Extended service life
Although all batteries degrade over time and lose effectiveness as they age, the lifespan of a battery can vary significantly. Typically measured by battery cycling, longevity or cycle life is the number of complete charges and discharges a battery can go through before it can no longer be charged. [8] Therefore, discharging the battery to 50% and then charging it to 100% only counts as half of the battery cycle. For example, consider marine batteries. If you compare an SLA battery (a type of lead-acid battery commonly used on boats) to a lithium iron phosphate (LiFePO4) battery, you will get a very different number of total charge cycles. The chemical differences between SLA and LiFePO4 batteries will cause SLA batteries to last 50 to 500 cycles, while LiFePO4 batteries will last 1,000 to 10,000 cycles. [9] Many affordable lithium-ion batteries used in consumer products ranging from flashlights to speakers can last at least 300 to 500 full discharge/charge cycles before the battery capacity drops below 80%. [10]
The lack of memory effect also extends the service life of lithium batteries. For example, nickel-based rechargeable batteries will gradually lose their ability to store energy if they are only partially discharged. The "memory" of partial discharge can negatively impact battery life by reducing the capacity of future chargers.
Lithium batteries also have the advantage of depth of discharge, which is the percentage of battery power that can be safely drained without causing damage to the battery. [11] Lithium batteries can be safely discharged to 85% of their total capacity, while lead-acid batteries cannot be discharged beyond 50% without negatively affecting the battery's service life. [12]
All of these factors combine to easily give lithium batteries a lifespan of 10-15 years, compared to 3 to 12 years for lead-acid batteries. [13]
Disadvantages of lithium batteries
For all their advantages, lithium batteries do have some significant disadvantages, namely increased fire risk and higher cost.
Because lithium batteries contain more energy, they also have more energy to release when something goes wrong. In fact, the higher the energy density of a battery, the more potentially dangerous it is.
One of the biggest risks with lithium-ion batteries is their susceptibility to thermal runaway. When thermal runaway occurs, lithium batteries will enter an uncontrollable self-heating state, leading to extremely high temperatures, fires and even explosions. [14] Depending on the chemistry of lithium batteries, some are more dangerous than others. For example, lithium iron phosphate (LiFePO4) batteries are less likely to overheat than other lithium battery chemistries. [15]
The liquid electrolytes used in lithium batteries are highly volatile, increasing the risk of fires and exacerbating the threat of thermal runaway reactions. This is why most lithium batteries have built-in safety features and self-limit their energy density.
Another major disadvantage of lithium batteries is the higher upfront cost compared to lead-acid and other battery types. However, the cost advantages of other battery types may disappear when usage patterns and battery life are considered
It’s time to switch to lithium batteries
First developed in 1859, lead-acid batteries have been popular for more than 160 years. [16] The first viable lithium-ion battery was patented more than a century later, in 1976. [17] Since the advent of the first lithium battery, the sales of lithium batteries have been growing, and lithium batteries have become an indispensable part of our daily lives. They power our smartphones, laptops and even our homes. In addition, their efficiency, longevity and safety are improving year by year, while the associated costs are also decreasing. Today's lithium batteries are superior to other commercially available battery types in almost every way. With this in mind, why would you choose any other battery?
