
1. The charging and discharging rate performance of lithium ion batteries
is directly related to the mobility of lithium ions in positive and negative
electrodes, electrolyte and its interface. All the factors that affect the speed
of lithium ion migration (which can be equivalent to the internal resistance of
a battery) affect the charge and discharge rate of a lithium ion battery. In
addition, the heat dissipation rate inside the battery is also an important
factor affecting the rate performance. If the heat dissipation speed is slow,
the heat accumulated during the charging and discharging of large-capacity
batteries cannot be transferred, which seriously affects the safety and service
life of lithium-ion batteries. Therefore, it is of great significance to study
and improve the charge-discharge ratio performance of lithium ion batteries,
improve the migration speed of lithium ions and the internal heat dissipation
rate of batteries. For the internal resistance of lithium ion batteries,
conductive agents are usually added inside the active material of the positive
electrode to reduce the contact resistance between the active material and
between the active material and the collector of the positive electrode matrix,
and improve the conductivity (ionic and electronic conductivity) to improve the
utilization and performance of the positive electrode material. Different
materials and different shapes of conductive agents will affect the internal
resistance of lithium-ion batteries, and then affect their amplification
performance. The positive and negative collectors (lugs) are carriers of energy
transfer between lithium-ion batteries and the outside world. The resistance of
the collector also has a great influence on the amplification performance of the
battery. Therefore, the rate performance and cycle life of Li-ion batteries can
be improved by changing the material, size, extraction method and connection
process of the collector.
2. In addition, the absorption rate and porosity of the isolation membrane
also have a great impact on the passability of lithium ions, and will also
affect the rate performance of lithium ion batteries to a certain extent
(relatively small). The penetration degree of electrolyte and anode material of
lithium ion battery will affect the contact resistance of electrolyte and
electrode interface, thus affecting the magnification performance of battery.
The total amount of electrolyte, viscosity, impurity content and pores of anode
and cathode materials will change the contact impedance between electrolyte and
electrode, which is an important research direction to improve the amplification
performance. The ionic conductivity of electrolytes The ionic conductivity of
electrolytes is the same as the resistance of water, which has a great influence
on the swimming speed of lithium ions. At present, organic electrolytes, both
liquid and solid, used in lithium-ion batteries are not very ionic conductive.
Electrolyte resistance has become an important part of the whole battery
resistance, and its influence on the high rate performance of lithium ion
batteries cannot be ignored. In addition to improving the ionic conductivity of
the electrolyte, we should also pay attention to the chemical and thermal
stability of the electrolyte. When charging and discharging at a large rate, the
electrochemical window of the cell has a wide range. If the chemical stability
of the electrolyte is not good, it is easy to oxidize and decompose on the
surface of the cathode material, affecting the ionic conductivity of the
electrolyte. The spread of the positive and negative lithium ion battery
capacity lithium ion battery embedded embedded and the rate of the anode cathode
active material, the lithium ions from the positive cathode active material in
escape velocity, or are they from the positive and negative surface active
material to find a stable speed, is an important factor to influence than to
charge and discharge.
Read recommendations:
deep cell marine battery wholesaler
solar generator for camping
LiFePo4 Battery Pack 12V 350Ah
Explanation of the Development Trends of the Global Lithium Battery Industry.portable power station solar
3.6V lithium battery.deep cycle battery for sale