Factors affecting the fast charging capability of lithium batteries from the perspective of battery composition -Lithium - Ion Battery Equipment
Factors affecting the fast charging capability of lithium-ion batteries are analyzed from the perspective of battery structure.
Under different state parameters and environmental parameters, the charging current value of each lithium-ion battery is optimal. So, from the perspective of battery structure, what are the factors that affect the optimal charging value?
Microscopic charging process
Lithium-ion batteries are known as rocking chair batteries, in which charged ions move between the positive and negative electrodes, ending the charge transfer to power or charge external circuits. During the specific charging process, external voltage is applied to the north and south poles of the battery, and lithium ions detonate from the positive electrode into the electrolyte. The remaining electrons are generated together and move toward the negative electrode through the positive electrode collection fluid and the external circuit. Lithium ions travel from the positive electrode to the negative electrode in the electrolyte and reach the negative electrode through the gap; they are embedded in the graphite layer structure of the anode through the SEI film on the outer surface of the anode and combine with electrons.(Lithium - Ion Battery Equipment)
Throughout the working process of ions and electrons, the battery structure that affects charge transfer, whether electrochemical or physical, will affect the fast charging function.
Fast charging requires all parts of the battery
Regarding the battery, assuming the trip power function requires overall efforts in every aspect of the battery, first including the positive electrode, negative electrode, electrolyte, gap and structural planning.
anode
In fact, a wide variety of anode materials can be used to make almost all fast-charging batteries, first to ensure demand functions including conductance (reduce internal resistance), March (guaranteed reaction kinetics), stature (don't clarify), safety (don't clarify) ,Appropriate processing functions (product appearance is not too large to ,reduce side ,security services). Of course, with respect to ,each specific data set, the problem to be solved may be ,different, but public positive data sets can be ,optimized to satisfy These requirements, however, vary between different datasets:
A. Lithium iron phosphate may focus more on conductivity and low temperature issues. Carbon coating, moderate nanonization (note, moderate, of course not the simple logic of finer is better), and dealing with the formation of ionic conductors on the outside of the particles are the most typical strategies.
B. The conductivity of ternary data itself is now better, but the reactivity is too high, so ternary nano is a rare job (nanomedicine is not a snake oil type information function, especially in the field of batteries and sometimes many reactions), more and more attention is being paid Safety and Bay (electrolyte) are actually a triple curse of safety. The recent frequent safety accidents in batteries have put forward higher requirements.
C. Lithium manganate is more about lifespan. There are also many lithium manganate fast-charging batteries on the market.
cathode
When a lithium-ion battery is charged, lithium moves toward the negative electrode. And the high current of fast charging may cause the negative electrode potential to be more negative, the negative pressure sensitive to receive lithium becomes larger, and the lithium dendrites tend to become larger, so fast charging, when the cathode is not only able to meet the dynamic demand of lithium dysfunction, but also more Dealing with the formation of lithium dendrites often aggravates safety issues. Therefore, it is the core difficulty of fast charging and the important technology of lithium ion embedding in the cathode.
, the control position negative data on the market is still graphite (accounting for about 90% of the market share), without its basic reason, cheap (you feel the battery is expensive every day, exclamation mark!), and graphite induction processing function, energy density is relatively Nice, relatively few flaws. Of course, there are also problems with the graphite cathode. Its appearance is relatively sensitive to the electrolyte, and the intercalation response of lithium has a strong directionality. Therefore, after the graphite surface is treated, its structure develops stably, which promotes the loosening of lithium ions. On this basis, the direction important sexual needs.
Under different state parameters and environmental parameters, the charging current value of each lithium-ion battery is optimal. So, from the perspective of battery structure, what are the factors that affect the optimal charging value?
Microscopic charging process
Lithium-ion batteries are known as rocking chair batteries, in which charged ions move between the positive and negative electrodes, ending the charge transfer to power or charge external circuits. During the specific charging process, external voltage is applied to the north and south poles of the battery, and lithium ions detonate from the positive electrode into the electrolyte. The remaining electrons are generated together and move toward the negative electrode through the positive electrode collection fluid and the external circuit. Lithium ions travel from the positive electrode to the negative electrode in the electrolyte and reach the negative electrode through the gap; they are embedded in the graphite layer structure of the anode through the SEI film on the outer surface of the anode and combine with electrons.(Lithium - Ion Battery Equipment)
Throughout the working process of ions and electrons, the battery structure that affects charge transfer, whether electrochemical or physical, will affect the fast charging function.
Fast charging requires all parts of the battery
Regarding the battery, assuming the trip power function requires overall efforts in every aspect of the battery, first including the positive electrode, negative electrode, electrolyte, gap and structural planning.
anode
In fact, a wide variety of anode materials can be used to make almost all fast-charging batteries, first to ensure demand functions including conductance (reduce internal resistance), March (guaranteed reaction kinetics), stature (don't clarify), safety (don't clarify) ,Appropriate processing functions (product appearance is not too large to ,reduce side ,security services). Of course, with respect to ,each specific data set, the problem to be solved may be ,different, but public positive data sets can be ,optimized to satisfy These requirements, however, vary between different datasets:
A. Lithium iron phosphate may focus more on conductivity and low temperature issues. Carbon coating, moderate nanonization (note, moderate, of course not the simple logic of finer is better), and dealing with the formation of ionic conductors on the outside of the particles are the most typical strategies.
B. The conductivity of ternary data itself is now better, but the reactivity is too high, so ternary nano is a rare job (nanomedicine is not a snake oil type information function, especially in the field of batteries and sometimes many reactions), more and more attention is being paid Safety and Bay (electrolyte) are actually a triple curse of safety. The recent frequent safety accidents in batteries have put forward higher requirements.
C. Lithium manganate is more about lifespan. There are also many lithium manganate fast-charging batteries on the market.
cathode
When a lithium-ion battery is charged, lithium moves toward the negative electrode. And the high current of fast charging may cause the negative electrode potential to be more negative, the negative pressure sensitive to receive lithium becomes larger, and the lithium dendrites tend to become larger, so fast charging, when the cathode is not only able to meet the dynamic demand of lithium dysfunction, but also more Dealing with the formation of lithium dendrites often aggravates safety issues. Therefore, it is the core difficulty of fast charging and the important technology of lithium ion embedding in the cathode.
, the control position negative data on the market is still graphite (accounting for about 90% of the market share), without its basic reason, cheap (you feel the battery is expensive every day, exclamation mark!), and graphite induction processing function, energy density is relatively Nice, relatively few flaws. Of course, there are also problems with the graphite cathode. Its appearance is relatively sensitive to the electrolyte, and the intercalation response of lithium has a strong directionality. Therefore, after the graphite surface is treated, its structure develops stably, which promotes the loosening of lithium ions. On this basis, the direction important sexual needs.
