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[Concept]
Generally use lithium element-containing material is used as the electrode of the battery.
Representative of the modern high-performance batteries.
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[History]
1970s Exxon MSWhittingham uses titanium sulfide as the cathode material, lithium metal as the anode material, made the first lithium battery.
1982 University of Illinois (the Illinois Institute of Technology) RRAgarwal and JRSelman found lithium ion embedded graphite characteristics over
The process is rapid, and reversible.
At the same time, the use of lithium metal battery made of lithium, its security risks of concern, so people try to take advantage of the characteristics of the lithium ion embedded graphite production of rechargeable batteries.
Successful trial available lithium-ion graphite electrode by Bell Labs.
The 1983 M.Thackeray, J.Goodenough manganese spinel cathode material is excellent, cheap, stable and excellent conductivity and conductivity of lithium performance.
Its decomposition temperature is high, and the oxidation resistance is far lower than the lithium cobalt oxide, even if there is a short circuit, overcharge, the combustion can be avoided, the danger of explosion.
In In 1989, A.Manthiram J.Goodenough found polymerization anion positive electrode will generate a higher voltage.
1991 Sony released the first commercial lithium-ion battery.
Subsequently, the lithium-ion batteries revolutionized the face of consumer electronics products.
Such a lithium cobalt oxide as the cathode material of batteries, is still the main power of the portable electronic device.
1996 Padhi and Goodenough found phosphates with olivine structure, such as lithium iron phosphate (LiFePO4), more security than traditional cathode materials, especially high temperature resistance to overcharge performance far more than traditional lithium-ion battery materials. Has become the current mainstream large current discharge power lithium battery cathode material.
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[Confusion]
The lithium-ion battery is easy to confuse the two batteries:
(1) Lithium Battery: Lithium single mass.
(2) lithium ion polymer battery: polymer to replace liquid organic solvent.
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[Security]
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1. Emphasis on short-circuit condition]
About the safety of the lithium-ion battery, please friends seriously. The lithium-ion battery charging process is very prone to short-circuit condition.
Although most of the lithium-ion battery with protected against short circuit, explosion-proof line. But in many cases, this circuit in a variety of circumstances, will not necessarily function. The explosion-proof line can play a role is also very limited.
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[Charging not too filling]
Lithium-ion battery, both previously developed, or in recent years developed polymer lithium-ion battery, lithium iron batteries, etc., are very afraid of overcharge.
The lithium-ion battery charging time is too long, will increase the possibility of explosion.
Lithium chemical properties are very active, and very easy to burn, when the battery charge and discharge, the internal battery continues to heat up, the expansion of the gas generated in the activation process, so that the internal pressure of the battery increase. Pressure reaches a certain level, such as shell injuries that may rupture, causing leakage, fire, or explosion.
Therefore, we use lithium-ion batteries to be very aware of safety.
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Early lithium battery 3. []
The lithium-ion battery (Li-ion Batteries) lithium batteries evolved. So before you introduce the Li-ion, first introduced lithium battery.
For example, in terms of the previous camera button battery is a lithium battery.
Lithium battery cathode material is manganese dioxide or thionyl chloride, and the negative electrode is lithium. Battery assembled battery voltage, without charge. Such batteries can be charged, but poor cycle performance in the process of charge-discharge cycle, it is easy to form lithium crystallization, resulting in the battery internal short-circuit, so under normal circumstances, this battery is prohibited charging.
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4. Lithium-ion battery: Carbon Materials lithium battery]
Later, Sony Corporation of Japan the invention carbon materials for the anode, the lithium-containing compounds as the positive electrode of lithium battery, the process of charging and discharging, no lithium metal, only the lithium-ion, lithium-ion battery.
When charging the battery, the positive electrode of the battery, lithium ions generated, the resulting lithium ion movement through the electrolyte to the negative electrode. As a carbon of the negative electrode was a layered structure, it has a lot of pores, reaching the negative electrode of lithium ions embedded into the porous carbon layer, embedded in a lithium ion is more, the higher the charging capacity.
Similarly, when the discharge of the battery (ie battery), embedded in the the negative carbon layer in the lithium-ion prolapse, and movement back to positive. Back to the positive electrode of a lithium ion, the more the higher discharge capacity.
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5. [Li-ion Batteries: rocking chair type battery]
We usually said battery capacity refers to the discharge capacity.
Li-ion charge-discharge process, lithium-ion is positive → negative → positive state of motion.
Li-ion Batteries is like a rocking chair, rocking chair both ends of the poles of the battery, the lithium ions in a rocking chair like athlete running back and forth. Battery Li-ion Batteries also known as a rocking chair.
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【Article is excerpted from: Baidu Encyclopedia】
【Network reprint / Just reference】
【Translation is by Goolge】
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