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Author ：Iflowpower – Portable Power Station Supplier
The lithium ion battery principle The lithium ion battery is composed of a positive electrode, an anode, a diaphragm, and an electrolyte. The positive and negative electrode layer is tightly rolled together, and the layer and the layer are separated from the insulator, and the positive and negative is immersed in the electrolyte . Cylindrical batteries and square batteries have been used as a lithium ion battery structure battery composed of two different lithium-insertic compounds, respectively.
The positive electrode material is tightly transition metal oxide, metal oxide, metal sulfide, and the like . commercial The positive electrode material commonly used in lithium-ion batteries is the most widely used anode material for transition metal oxides. The anode material is tightly inorganic non-metallic materials, metal-non-metallic composites, metal oxides, and the like .
lithium iron phosphate positive and negative material The electrode electrode material is formed on the conductive material determines the voltage and capacity electrolyte of the battery as a tight part of the lithium ion battery, and plays a desire for current transmission during battery charge and discharge. In order to prevent the positive and negative electrode material immersed in the electrolyte in the electrolytic solution, the positive and negative electrode material is separated from the positive and negative electrode material that is immersed in the electrolyte. The LI is taken from the positive electrode, and the negative electrode is embedded into the negative electrode, the positive electrode is in a lithium state, the compensation charge of the electrons is supplied by the external circuit to ensure the balance of charge.
The discharge is related to the discharge, and Li is removed from the negative electrode and is embedded into the cathode material by the electrolyte. Under normal charging and discharging conditions, lithium ions are embedded and removed between layered carbon materials and layered structures, which typically only causes changes in the spacing of the material layer without damaging their crystal structure. During the charge and discharge process, the chemical structure of the negative electrode material is basically unchanged.
The ion reaction equation is increasingly impossible to add security measures inside the battery, as it is pursuing higher capacity to increase battery life. From the 1991 lithium-ion battery commercialization to this chartered, the power capacity of lithium-ion batteries added a mechanism of four or five times lithium-ion battery explosion. So we understand how it works, so we can understand what the original caused Lithium ion battery explosion .
Charge and discharge of lithium branch crystal growth battery is the return transfer of lithium ions. During charging, lithium ions are reduced to metal lithium embedded in the negative electrode. In general, lithium can be embedded in the interlayer structure, which may grown in the surface of the electrode due to the uncertainty of growth, and the growth layer has the same stabbed structure as the branch, which can damage the diaphragm of the battery, resulting in short circuit inside the battery.
And battery explosion. If the battery is defective, the metal particles connect the positive negative electrode through the battery's insulating layer, change the direction of the current, causing the internal material to degrade, so that the chemical reaction is loses control, release more heat, ignit the battery package battery Charging our current battery has a protection system, feedback battery voltage, with alert over charge, which may cause overcharge, battery protection system or battery charger damage When charging occurs, the lithium ion left in the cathode material Continued to be removed and embedded in the negative electrode material. If the maximum lithium embedded in the carbon negative electrode is reached, the excess lithium will deposit on the negative electrode material in the form of lithium metal, greatly reduced the stability performance of the battery.
Even the explosion is related to the lithium-ion battery, not only is the battery capacity is an improvement, but the safety performance can not be ignored. Today, some battery manufacturers have a high safety standard, even to detect batteries. We understand that when the nail penetrates the battery, it will connect directly to the positive negative, which will cause internal short circuit.
The gel electrolyte and polymer electrolyte are also in further exploration, especially the development of the polymer electrolyte, there is no liquid organic electrolyte volatilization in the battery, which greatly improves the safety of the battery.
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