The principle of 18650 2200mah battery, 18650 2200mah battery technology has unlimited potential

　　The principle of 18650 2200mah battery, 18650 2200mah battery technology has unlimited potential. In fact, the main driving force for the rapid expansion of the battery industry in recent years comes from the demand of the power battery industry. Therefore, the most important thing to consider in the development and practicalization of battery technology is the needs of power batteries. At this time, The extreme polarization of lithium-air batteries even at low rates will inevitably lead to very unsatisfactory energy efficiency and rate performance, which is also an important obstacle to overcome for its practical use in the field of power batteries. The following describes the principles of lithium-air batteries and their technological potential.

　　What is lithium air battery

　　18650 2200mah battery, commonly known as metal fuel cell, is a lithium battery that uses metallic lithium as the negative electrode and oxygen as the positive electrode. Its advantage lies in its high specific energy, which is theoretically close to gasoline. Lithium-air batteries have higher energy density than lithium-ion batteries because the cathode (mainly porous carbon) is light and oxygen is obtained from the environment rather than stored in the battery. The disadvantage of lithium-air batteries is that the reaction is poorly reversible and requires a catalyst.

　　The principle of lithium air battery

　　18650 2200mah battery is a battery that uses lithium as the anode and oxygen in the air as the cathode reactant. Lithium-air batteries have higher energy density than lithium-ion batteries because the cathode is light and oxygen is obtained from the environment rather than retained in the battery. Lithium-air batteries use lithium as the negative active material and porous gas diffusion layer electrodes as the positive material. According to the electrolyte system, it is mainly divided into organic electrolyte liquid (non-aqueous electrolyte system), aqueous electrolyte system, mixed electrolyte system and all-solid state electrolyte system.

　　Discharge process: Lithium in the anode releases electrons and becomes lithium cations (Li+). Li+ passes through the electrolyte material and combines with oxygen and electrons flowing from the external circuit at the cathode to form lithium oxide (Li2O) or lithium peroxide (Li2O2). and remain at the cathode. The open circuit voltage of lithium-air batteries is 2.91V.

　　The concept of lithium-air batteries was first proposed by Lockheed, and the electrolyte is an alkaline aqueous solution. Oxygen undergoes an oxygen reduction reaction at the air electrode to form hydroxide. The discharge reaction equation is: 4Li+O2+2H2O→4LiOH(1-1).

　　During the discharge process, Li, H2O and O2 are consumed, forming a protective film on the surface of Li, which hinders the rapid progress of the electrochemical reaction. In the open circuit or low power state, the self-discharge rate of Li is very high, accompanied by the corrosion reaction of Li: Li+H2O→LiOH+1/2H2(1-2).

　　In aqueous electrolytes, metal Li reacts easily with water, so there are high requirements for the water resistance of lithium-ion separators, and there are currently no commercial products. Considering practicality and safety, aqueous lithium-air batteries are not the first choice for final practical applications.

　　18650 2200mah battery technology has unlimited potential

　　18650 2200mah battery is a very promising high-specific-capacity battery technology. It utilizes the reversible reaction of lithium metal and oxygen. Its theoretical energy density upper limit reaches 11,000Wh/kg, which is far higher than the current actual energy density of 200+Wh/kg. Therefore, It has been enthusiastically welcomed by academia and industry and is widely regarded as a future disruptive technology in the battery field. However, the research on lithium-air batteries has always been met with a lot of doubts in the industry. Many people believe that the definition of lithium-air batteries is unclear (should be called lithium oxygen), the reaction mechanism is complex, the polarization efficiency is high, the cycle life is poor, It is not a reliable development direction for the battery industry in the future (where power battery demand is an important industry driving force). Of course, during this process, researchers continued to work hard and produced many results, and discussions on the prospects of this direction were also in-depth.

　　Recently, American scientists have achieved a breakthrough in the research of lithium-air batteries. They published a paper in "NATURE" and successfully made a battery that can cycle more than 700 times in an air-like atmosphere. This is a good solution to the problem that many previous systems could only be combined with The problem of pure oxygen reactions and poor cycle life (often only a few dozen times) has made significant progress at the scientific level in this field. Here, the author will briefly introduce the research progress of this article and briefly look forward to the future industrialization and practical prospects of 18650 2200mah battery technology.

　　18650 2200mah battery technology has always been a hot technology that has attracted people's attention. Its high theoretical energy density has been unanimously expected by everyone. However, there have always been many problems and challenges with this technology. Many people in the industry pointed out: "Lithium-air batteries combine the shortcomings of fuel cells and lithium-ion batteries" and "too many side reactions" and a series of problems. Here, the author also wants to briefly look forward to the prospects of 18650 2200mah battery technology based on the progress of this article and the industry’s expectations for battery technology.

　　The main problems that 18650 2200mah battery technology needs to solve are: preventing chronic leakage of separators using two electrolytes; increasing the usable temperature of organic electrolytes; finding catalysts that can replace the currently used gold and platinum; and how to replace lithium fuel. Prevent explosions caused by water vapor intrusion; how to recycle unused lithium and lithium hydroxide; how to reduce the energy consumption of circulating lithium hydroxide.

　　Generally speaking, there is a large proportion of irreversible components in the reaction products of lithium-air batteries. This is a problem that cannot be avoided by various technical routes and must be solved head-on. Lithium-air batteries may subvert the battery field in the future, and there is still a long way to go for industrial practicality.

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