Quick formation method of lithium titanate battery

Abstract

The invention discloses a quick formation method of a lithium titanate battery. The quick formation method comprises the following steps of 1, performing constant-current charging on a battery at a temperature of T<1> by a current I<1> until a voltage U<1> is reached, and then performing constant-voltage charging at U<1> until the current is less than I<2>; 2, performing standing on the battery ata temperature of T<2> for the time of t<1>, and after the standing is completed, performing decompression and air exhausting; 3, performing constant-current discharging on the battery at the temperature of T<1> at a current of I<3> until a voltage U<2> is reached, then performing constant-current charging at the current I<3> until the voltage U<1> is reached, and performing constant-voltage charging at U<1> until the current is less than I<4>, and executing the charging-discharging procedures repeatedly for n<1> times; 4, performing standing on the battery at a temperature of T<3> for the time of t<2>, and after standing is completed, performing decompression and air exhausting; and 5, performing constant-current discharging on the battery at the temperature of T<1> at a current of I<5> until the voltage U<2> is reached, then performing constant-current charging at the current I<5> until the voltage U<1> is reached, and performing constant-voltage charging at U<1> until the current isless than I<6>, and executing the charging-discharging procedures repeatedly for n<2> times. By virtue of the quick formation method, the formation time is shortened, the formation efficiency is improved, and the prepared lithium ion battery is excellent in electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a rapid formation method for lithium titanate batteries. Background technique [0002] Lithium titanate material has been considered as an ideal negative electrode material to replace graphite due to its zero strain, high potential for lithium and nanometer size, which makes it have long life, high safety and fast charging. However, lithium titanate material is easy to Water-absorbing and highly active, it is easy to react with the electrolyte in the battery system and cause flatulence. Therefore, during the formation stage of lithium titanate batteries, a stable passivation film needs to be formed on the surface of the negative electrode to prevent further gas production during subsequent use. Therefore, the formation process directly affects the electrochemical performance of lithium titanate batteries; the traditional formation method uses a small current for formati...

AI Technical Summary

Problems solved by technology

[0002] Lithium titanate material has been considered as an ideal negative electrode material to replace graphite due to its zero strain, high potential for lithium and nanometer size, which makes it have long life, high safety and fast charging. However, lithium titanate material is easy to Water-absorbing and highly active, it is easy to react with the electrolyte in the battery system and cause flatulence. Therefore, during the formation stage of lithium titanate batteries, a stable passivation film needs to be formed on the surface of the negative electrode to prevent further gas production during subsequent use. Therefore, the formation process directly affects the electrochemical performance of lithium titanate batteries; the traditional formation method uses a small current for formation, aging for 7 days, and the formation cycle is about 14 days, which has the problems of long formation time and low efficiency.