Can lithium battery generally be used for a few years?

“Lithium battery” is a type of battery using a lithium metal or a lithium alloy as a negative electrode material and using a nonaqueous electrolyte solution. Lithium metal batteries were first proposed and studied by Gilbert N. Lewis in 1912. In the 1970s, M.S.W hittingham proposed and began to study lithium-ion battery. Due to the very active chemical properties of lithium metal, the processing, storage and use of lithium metal are very demanding on the environment. Therefore, lithium batteries have not been used for a long time. With the development of science and technology, lithium batteries have become the mainstream.

Lithium battery can be roughly divided into two categories: lithium battery and lithium ion batteries. Lithium ion battery does not contain lithium metal state, and can be recharged. The fifth generation of rechargeable battery product lithium battery was born in 1996, its security, specific capacity, self-discharge rate and cost performance is better than that of lithium ion batteries. Because of its high technical requirements limit, now only a few countries in the production of this kind of lithium battery.

Battery life

Lithium ion battery can charge and discharge 500 times?

Believe that the vast majority of consumers have heard of, the life of the lithium battery is "500", more than this number of times, the battery will "die", many friends in order to be able to extend battery life, each time to charge when the battery run out completely, so really have a longer effect on battery life? The answer is no. The life of a lithium battery is "500 times", which means not the number of times of charging, but a period of charging and discharging.

A charge cycle means that all of the battery's charge is from full to empty, and then from empty to full, which is not the same as charging. For example, a lithium battery used only half of its electricity on the first day and then fully charged it. If it is still the next day, it will be charged in half, and it will be charged twice in total. This can only be counted as one charging cycle, not two. Therefore, it is usually possible to complete a cycle after several charges. The battery capacity is reduced a little every time a charge cycle is completed. However, this power reduction is very small. After a high-quality battery is charged for many cycles, it still retains 80% of the original capacity. Many lithium-powered products are still used after two or three years. Of course, the lithium battery life needs to be replaced after the end.

The so-called 500 times is refers to the vendor in the constant depth of discharge (e.g., 80%), the number of rechargeable 625 times or so, to 500 charge cycles.

(80% * 625 = 500) (Ignoring factors such as lithium battery capacity reduction)

Due to the various effects of real life, especially the depth of discharge during charging is not constant. The "500 charging cycle" can only be used as a reference battery life.

In 1746, Mason Brock of the University of Leiden in the Netherlands invented the "Leyden Bottle" for collecting electric charge. Because he saw that the electricity that was hard to collect was easily disappeared in the air, he wanted to find a way to save electricity. One day, he hung in the air with a barrel, connected with a motor and a barrel, and a copper wire was taken from the barrel and immersed in a glass bottle filled with water. He gave an assistant a Holding the glass bottle in hand, Mason Brock swayed the motor from the side. At this time his assistant accidentally touched the other hand with the barrel. He suddenly felt a strong electric shock and shouted. Mason Brock then exchanged with the assistant, let the assistant shake the motor, he took the water bottle in one hand and the gun in the other.

In 1780, the Italian anatomist galvanic (Luigi Galvani) when doing the frog dissection, hands holding a different metal devices, inadvertently touch on frog's legs at the same time, the frog leg muscle twitches and immediately as if by the stimulation of current, and if only a metal instrument to touch the frog, there is no such reaction. Galvanic thinks, appear this kind of like now because of the animal body internally generated a electricity, what he called a "hybrid".

Galvanic found caused physicists have great interest, they compete to repeat cangue cutting experiment, trying to find a way to generate an electric current, Italian physicist v after the experiment many times that the galvanic "the bioelectricity" is not correct, the muscles of the frog can generate an electric current, is probably some kind of liquid in muscle at work. In order to demonstrate their point of view, and v the two different pieces of metal is immersed in all kinds of test in the solution. Results show that these two kinds of sheet metal, as long as there is a kind of chemical reaction happened and solution, can produce electric current between sheet metal.

In 1799, the Italian physicist Volt dipped a zinc plate and a tin plate in salt water and found that a current was passed through the wires connecting the two metals. Therefore, he flattened a lot of flax or paper soaked in salt water between the zinc sheets and the silver sheets. When you touch both ends by hand, you will feel strong current stimulation. In this way, Volt succeeded in making the world's first battery, the "Volt Stack." This "volt stack" is actually a battery pack in series. It became an early electrical experiment, the power of the telegraph machine to the battery source.

In 1836, Daniel of the United Kingdom improved the "Volt Stack". He used dilute sulfuric acid as the electrolyte to solve the problem of battery polarization, and produced the first zinc-copper battery that was not polarized and could maintain a balanced current. Since then, these batteries have a problem that the voltage decreases with the use of time.

When the voltage drops after the battery is used for a period of time, it can be given a reverse current to make the battery voltage rise. Because this battery can be recharged, it can be used repeatedly, so it is called "battery".

Also in 1860, France's George Leclanche also invented the predecessor of the world's widely used battery (carbon zinc battery). Its negative electrode is an alloy rod of zinc and mercury (the negative electrode of a zinc-volt prototype battery, which proves to be one of the best metals for the negative electrode material), and its positive electrode is a crushed two in a porous cup. a mixture of manganese oxide and carbon. A carbon rod was inserted into the mixture as a current collector. Both the negative electrode rod and the positive electrode cup were immersed in an ammonium chloride solution as an electrolytic solution. This system is called a "wet battery." The battery made by Lakeland was simple but cheap, so it was not until 1880 that the "dry battery" was replaced. The negative electrode is modified into a zinc can (i.e., the outer casing of the battery), and the electrolyte becomes a paste rather than a liquid, which is basically the carbon zinc battery that we now know.

In 1887, the Englishman Hellerson invented the earliest dry battery. The electrolyte of the dry battery is paste-like, does not leak, and is easy to carry, and thus has been widely used.

In 1890 Edison (Thomas Edison) iron nickel invention of rechargeable batteries.

Battery means a space in a cup, tank or other container or composite container containing an electrolyte solution and a metal electrode to generate electrical current, a device capable of converting chemical energy into electrical energy. It has a positive electrode and a negative electrode. As technology advances, batteries are broadly referred to as small devices that generate electrical energy, such as solar cells. The performance parameters of the battery mainly include electromotive force, capacity, specific energy and resistance. By using the battery as an energy source, it is possible to obtain a current with stable voltage, stable current, stable power supply for a long time, and little influence from the outside, and the battery has a simple structure, is convenient to carry, and is easy to operate in charge and discharge, and is free from external climate and temperature, stable and reliable performance, in all aspects of life in modern society play a large role.

Lithium batteries have a service life of only two to three years.

Lithium batteries are generally capable of charging and discharging 300-500 times. It is best to partially discharge the lithium battery instead of completely discharging it, and try to avoid frequent full discharge. Once the battery is off the production line, the clock begins to move. Lithium batteries last for only two to three years, whether you use them or not.

1. Shelf life refers to the period of time from the production of the product to the general quality of the product. It is also possible that some of the product quality will remain normal after the time period, so there is uncertainty. Buyers are passive during the warranty period.

2. Validity period means that certain items (things) can be used or made within a certain period of time, with a clear time limit. The user has the initiative during the validity period.

3. Batteries are usually printed shelf life, instead of writing production date, should from the shelf life prediction about delivery time, such as "02-01" valid for in February 2001, generally:

(1) The shelf life of alkaline batteries is 3 years;

(2) The shelf life of the P-type battery is 2 years;

(3) The shelf life of ordinary batteries is 1 year;

(4) Foreign brands print more shelf life than domestic brands for 1-2 years, so the above different types of batteries should be added.

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