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Lithium ion is the most popular rechargeable battery chemistry used today. Lithium-ion batteries power the devices we use every day, like our mobile phones and electric vehicles.
Lithium ion batteries consist of single or multiple lithium-ion cells, along with a protective circuit board. They are referred to as batteries once the cell, or cells, are installed inside a device with the protective circuit board.
Advantages of Lithium Ion Battery
Lightweight and compact design
Lithium ion batteries stand out with their lightweight and compact design, while still demonstrating exceptionally high energy density. With the capacity to deliver up to five times more power compared to conventional lead-acid batteries, they provide unparalleled efficiency, making them an ideal choice for portable energy storage solutions.
Long battery lifespan
Lithium ion batteries can endure approximately 2,000 charge-discharge cycles, providing a longer lifespan of 8-10 years.
High energy density
Lithium ion batteries offer superior energy density compared to other battery types. Their low self-discharge rate ensures minimal capacity loss, even during periods of inactivity.
Enhanced safety
Lithium ion batteries are manufactured to meet stringent international safety standards, making them resistant to water, explosions, and other hazards. They are widely used in transportation vehicles and electronic devices.
Faster charging times
Lithium ion batteries significantly reduce charging durations compared to lead-acid batteries. Provide battery swapping networks that can fully replace depleted lithium-ion batteries with fully charged ones in just 2 minutes, eliminating the need for extended charging times associated with traditional methods.
Characteristics of Lithium Ion Batteries
To compare and understand the capability of each battery, some important parameters are characteristic of each battery, also within a type of battery. These parameters are a reference when a battery is needed, and specific qualities are required since batteries are used in all types of devices and for infinite purposes.
Cell voltage
The voltage of electric batteries is created by the potential difference of the materials that compose the positive and negative electrodes in the electrochemical reaction. Almost all lithium-ion batteries work at 3.8 volts. In order to make current flow from the charger to the battery, there must be a potential difference.
Cut-off voltage
The cut-off voltage is the minimum allowable voltage. It is this voltage that generally defines the “empty” state of the battery. Li-ion battery has a higher cut-off voltage of around 3.2 V. Its nominal voltage is between 3.6 to 3.8 V; its maximum charging voltage can go to 4– 4.2 V max. The Li‑ion can be discharged to 3V and lower; however, with a discharge to 3.3V (at room temperature), about 92–98% of the capacity is used. Importantly, particularly in the case of lithium-ion batteries used in the vast majority of portable electronics today, a voltage cut-off below 3.2V can lead to chemical instability in the cell, resulting in a reduced battery lifetime.
Capacity
The coulometric capacity is the total amp-hours available when the battery is discharged at a certain discharge current from 100% to the cut-off voltage. Almost all lithium-ion batteries work at 3.8 volts.
C-rate of battery
C-rate is used to express how fast a battery is discharged or charged relative to its maximum capacity. It has units h−1. A 1c rate means that the discharge current will discharge the entire battery in 1 hour. Most Li-ion batteries can only withstand a maximum temperature of 60°c and are recommended to be charged at a maximum of 45°c under a 0.5c charge rate.
Self-discharge
Batteries gradually self-discharge even if not connected and delivering current. This is due to non-current-producing “side” chemical reactions that occur within the cell even when no load is applied. The rate increases with temperature and state of charge.
Degradation
Some degradation of rechargeable batteries occurs on each charge-discharge cycle. Degradation usually occurs because electrolyte migrates away from the electrodes or because active material detaches from the electrodes. Most modern 18650 lithium-ion batteries, which are common for laptop batteries, have a typical cycle life of 300 – 500 (charge, discharge cycles).
Depth of discharge
Depth of discharge is a measure of how much energy has been withdrawn from a battery and is expressed as a percentage of full capacity. For lithium-ion batteries, the cycle life of a cell strongly depends on the DOD. The loss of lithium ions and active electrode material is higher for larger DOD cycles. At high DODs, additional degradation mechanisms can occur, resulting in the decomposition and dissolution of cathode material and capacity fading.
Electrodes: The positively and negatively charged ends of a cell. Attached to the current collectors
Anode: The negative electrode
Cathode: The positive electrode
Electrolyte: A liquid or gel that conducts electricity
Current collectors: Conductive foils at each electrode of the battery that are connected to the terminals of the cell. The cell terminals transmit the electric current between the battery, the device and the energy source that powers the battery
Separator: A porous polymeric film that separates the electrodes while enabling the exchange of lithium ions from one side to the other.
6 Tips for Handling Lithium Ion Batteries
Never keep lithium ion batteries near heat sources or store them in areas with temperature extremes or high humidity.
Look for issues with your batteries, such as odor, leaks, or bulging.
Never ship batteries that are damaged or defective.
Be wary of cheap batteries. It is typically better to stick to name-brand options.
If you encounter a leaky battery, make sure no one in your house touches the spilled material. Wear personal protective equipment and handle it according to the manufacturer’s instructions.
If you are returning a product, make sure to inform the business of any issues you encountered with the batteries.
Applications of lithium ion batteries include:
● Mobile phones
● Laptops and tablets
● Wearable technology such as wireless headphones and smart watches
● Electric vehicles including automobiles, buses, rail, bicycles, scooters and hoverboards
● Portable and stationary power banks
● Renewable energy storage
● Implanted medical devices
● Cordless power tools
● Drones
● Satellites
Working Principles of Lithium Ion Batteries
During charging, lithium ions move from the cathode to the anode through the electrolyte
When you plug in your device or connect it to a charger, the process of charging a lithium ion battery begins. Inside the lithium ion battery, there are two electrodes: The cathode and the anode. The cathode is typically made up of lithium cobalt oxide, while the anode consists of graphite.
During charging, an external electrical current is applied to the lithium ion batteries. This causes lithium ions (positively charged particles) to migrate from the cathode to the anode through the electrolyte—a conductive medium that allows ion flow but not electron flow. This Li movement occurs due to electrochemical reactions within the cell.
During discharging, lithium ions move from the anode to the cathode through the electrolyte, creating a flow of electrons that can be harnessed as electrical energy
When you start using your device or disconnect it from a power source, discharging of lithium ion batteries takes place. The stored energy in a fully charged lithium ion battery is released as electrical energy during this process.
As you use your device, lithium ions move in reverse—from the anode back to the cathode—through the electrolyte. Simultaneously, electrons flow through an external circuit connected to your device powered by lithium ion batteries. This current flow creates a Li that powers your device's functions.
Reversible process allows for multiple charge-discharge cycles
One of the remarkable features of lithium ion batteries is their ability to undergo multiple charge-discharge cycles without significant loss in performance. This reversibility is crucial for their longevity and usability.
During charging and discharging, lithium ions shuttle back and forth between the cathode and the anode. This movement is enabled by the unique electrode architectures and materials used in lithium ion batteries. The graphite anode can efficiently intercalate lithium ions, while the cathode material allows for their release.
This reversible process ensures that lithium ion batteries can be recharged numerous times, making them a reliable source of power for our devices.
Common Types of Lithium Ion Batteries
There are several types of lithium ion batteries available in the market today, each with its own set of characteristics and applications. Here are three commonly used types:
Lithium cobalt oxide (LiCoO2):
This type of lithium ion battery is widely used in consumer electronics like smartphones and laptops. It offers a high energy density, allowing for compact designs, but it may have limitations in terms of safety and thermal stability.
Lithium iron phosphate (LiFePO4):
LiFePO4 batteries are known for their excellent thermal stability and safety features, making them suitable for applications where safety is paramount, such as electric vehicles and power tools. Lithium ion batteries have a lower energy density compared to LiCoO2 batteries but offer better cycle life and longevity.
Lithium nickel manganese cobalt oxide (LiNiMnCoO2):
Also known as NMC batteries, these offer a balance between energy density, power output, and lifespan. NMC batteries, which are a type of lithium ion battery, are commonly found in electric vehicles due to their ability to deliver high performance while maintaining a reasonable lifespan.
There are many tools around us that run on electricity. Taking advantage of the benefit that they are small and powerful, lithium ion batteries are incorporated into a variety of devices. In particular, products such as smartphones, PCS, and digital cameras became smaller, lighter, and longer lasting after they started using lithium ion batteries.
Electric vehicles were initially equipped with nickel metal hydride batteries. However, they now use lithium ion batteries because of their benefits in being powerful and having low self discharge and because they do not suffer from the non user friendly inability to allow top up charging like nickel metal hydride batteries.
Lithium ion batteries are also used for small home appliances such as cordless vacuum cleaners and irons, vehicles such as electric bicycles and electric motorcycles, and applications such as storing electricity generated during the day using a solar power generation system at home.
What Are the Tips and Precautions for Charging Products That Use Lithium Ion Batteries?
Just as lithium ion batteries have different characteristics from other batteries, they will last longer if you use them with an understanding of their characteristics. Understand the points and features of charging to maintain performance.
Top up charging is okay with lithium ion batteries.
One of the features of lithium ion batteries is their user friendliness. For example, with nickel metal hydride batteries and nickel cadmium batteries, if you try to add charge while capacity remains, the battery may not appear to be charged more than that remaining capacity. This is called the “memory effect,” and it basically does not happen with lithium ion batteries.
To prevent the memory effect in nickel metal hydride batteries and nickel cadmium batteries, it is recommended to charge them after using up all the electricity. Lithium ion batteries, in contrast, can be said to be more user friendly because you can top up their charge before running them down completely.
How to make lithium ion batteries last longer
Devices that use lithium ion batteries, such as smartphones and laptops, use circuits that do not allow charging beyond the battery's capacity even if the battery is used while always charged. So, there is no worry that the battery will be overburdened, but if you want a lithium ion battery to last longer, it is best to continue using it while charged up to about 50% and connected to a power supply. Some laptops can be set to not charge more than 50%.
Overcharging and over discharging should be avoided in lithium ion batteries.
Conversely, the thing to avoid with lithium ion batteries is using a device while maintaining a 100% charged state. If you continue to use a fully charged laptop while it is connected to a power supply, it will shorten the battery life.
On the other hand, leaving a device in inactive storage in an over discharged state where almost all the electricity is used up can also shorten the life of lithium ion batteries. In other words, avoid use in the extreme states of being overcharged and over discharged. This is similar to the way exercising in a state of fullness or hunger puts an undue burden on the body.
Remember to try to use lithium ion batteries at room temperature.
To get stable performance out of lithium ion batteries, it is best to use them at room temperature. You may have heard the rumor that they will last longer when cooled, but this is counterproductive because the battery's resistance value increases at low temperatures, increasing the load for charging and discharging. Moreover, cooling may cause condensation on the battery, and the circuits around the battery may short circuit.
Zhejiang Xinghai Energy Technology Co., LTD. (referred to as "Xinghai Energy") is a subsidiary of Headway Group, which is involved in the field of lithium-ion battery, optical cable and data cable etc. With a total asset of 1 billion Yuan and 1,500 employees (192 technical personnel included), Headway Group has currently become an international enterprise with an annual output over 1 billion Yuan. Domestic marketing & sales are mainly handled by Headway Group's North and South Business Divisions' branches / offices in Beijing, Shanghai, Chengdu, Hangzhou, Shenzhen, Guangzhou, Shijiazhuang, Zhengzhou, Xi'an, Jinan, Qingdao, Shenyang and other places; as to the international business which is led by Xinghai Energy's Sales Department and Headway Group branches in Beijing, Shenzhen and Germany.
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FAQ
Q: What is a lithium-ion battery?
Q: What is the difference between a lithium battery and a regular battery?
Q: What is the difference between lithium-ion and acid batteries?
Q: How do I know if my battery is lead-acid or lithium-ion?
Q: Which battery is better than lithium ion battery?
Q: What type of battery is better than lithium?
Q: Which battery is better lithium-ion or alkaline?
Q: Why are lithium-ion batteries banned?
Q: What is safer than lithium-ion batteries?
Q: Is it safe to store lithium batteries in the house?
Q: What household items have lithium batteries?
Q: What items have lithium batteries in them?
Q: Do all batteries have lithium ion?
Q: What are the applications of lithium primary battery?
Q: How long do lithium-ion batteries last?
Q: Can I overcharge my device if I leave it plugged in overnight?
Q: Are all lithium-ion batteries rechargeable?
Q: Can lithium-ion batteries catch fire or explode?
Q: Are there any eco-friendly alternatives to lithium-ion batteries?
Q: Are there lithium-ion batteries in AA format?
As one of the leading lithium ion batteries manufacturers and suppliers in China, we warmly welcome you to buy high-grade lithium ion batteries from our factory. All our products are with high quality and competitive price.
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