How does the amount of electrolyte affect battery performance?

Different anode materials are to choose the appropriate electrolysis system, does not guarantee battery has good electrochemical properties, but also according to the different anode material needs to determine the appropriate amount of electrolyte.

1. The amount of electrolyte demand standard of judgment

Electrolyte for lithium ion migration and charge transfer medium, in order to ensure the active substances are fully used, require batteries core winding the gap filled with electrolyte.The compaction density is not the same as the anode material, the demand for electrolyte volume difference between each other.General situation is the compaction density cobalt acid electrolyte of lithium battery anode materials demand is small, low compaction density of three yuan and manganese acid lithium anode system battery electrolyte needs the most.

2. The quantity will affect the performance of the battery electrolyte

(1) the amount of electrolyte influence on battery capacity

From figure 1 add few electrolyte charge-discharge curve is not normal, charging capacity than other values, discharge capacity is far less than other values.Capacity increases with the increased amount of electrolyte, the best battery capacity is just the diaphragm.Visible electrolyte amount is insufficient, inadequate positive plate infiltration, the diaphragm not infiltrate, lead to internal resistance is big, low capacity to play.The increased amount of electrolyte is conducive to make full use of the capacity of the active material.Therefore, battery capacity have a great relationship with the amount of electrolyte, battery capacity increases with the increased amount of electrolyte, but in the end the basic tend to be constant.

(2) the amount of electrolyte effect the performance of the cell cycle

From figure 1 with the increase of ratio capacity difference is more apparent, the cycle of the battery performance.Quantity is less, electrolyte conductivity decreased, after loop resistance increase fast, accelerate cell local electrolyte decomposition or volatile, gathered speed is cell cycle performance deterioration.The excessive electrolyte batteries side effects is also relatively increase, gas production is more, resulting in a decline in the cycle performance of the batteries.Moreover, excess waste electrolyte.Thus amount of electrolyte on the cycle of the battery performance influence is very obvious, the electrolyte too little or too much, go against the cycle performance of battery.

(3) the amount of electrolyte on the battery safety performance

Battery safety performance is good is mainly use don't appear in the process of drum shell and explosions.Battery explosion of one of the reasons is the fluid injection rate cannot meet the technical requirements.When the electrolyte, the quantity is too small battery internal resistance is big, fever.Temperature rapid decomposition gas in the electrolyte, the diaphragm to melt, gassing short circuit battery explosion.When the electrolyte and anode materials are adopted by the side effects are too much, gas production can be by adding an appropriate amount of electrolyte infiltration agent to reduce the amount of electrolyte, thereby reducing gas problem too much, increasing the safety of the battery.And when excessive amounts of liquid electrolyte, in the process of charging and discharging gas quantity is big, the battery internal pressure big, shell burst, cause the electrolyte leakage.The electrolyte at higher temperature, air and fire.

The electrolyte is lithium ion batteries an indispensable important part of lithium ion battery for high voltage, high energy density, high cycle performance advantages, such as the necessary conditions. The amount of electrolyte for electrochemical performance of battery, the safety performance has important influence, too much or too little is appropriate, determine the need to experiment with anode materials are appropriate to the amount of electrolyte, the diaphragm.

The page contains the contents of the machine translation.