Method and apparatus for charging a secondary battery by supplying pulsed current as charging current
First Claim
1. A method for charging a secondary battery comprising a positive electrode, a negative electrode made of lithium, and an electrolyte, said method comprising the steps of:
- producing a pulsed current which has a predetermined repetition frequency from 50 Hz to 10 MHz, inclusive, and which has a positive pulse amplitude sufficient to produce a predetermined current density of from 1 μ
A/cm2 to 1 mA/cm2, inclusive, in said positive electrode, said pulsed current comprising a positive pulsed current followed by a negative pulsed current, said positive pulsed current having said positive pulse amplitude sufficient to produce said predetermined current density of from 1 μ
A/cm2 to 1 mA/cm2, inclusive, in said positive electrode, and said negative pulsed current having a negative pulse amplitude sufficient to produce a second current density less than said predetermined current density, said second current density not being greater than a quarter of said predetermined current density; and
supplying said pulsed current to said secondary battery to make the pulsed current flow between said positive electrode and said negative electrode through said electrolyte to thereby charge said secondary battery.
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Abstract
In a method for charging a secondary battery having a positive electrode, a negative electrode, and an electrolyte, a pulsed current is supplied to the secondary battery to make the pulsed current flow between the positive electrode and the negative electrode through the electrolyte to thereby charge the secondary battery. The pulsed current comprises positive pulse current which has a positive pulse amplitude corresponding to a first current density of 1 μA/cm2 to 100 mA/cm2 in the positive electrode. However, the pulsed current may include a negative pulse current following after each positive pulse and having a negative amplitude corresponding to a second current density not greater than a quarter of the first current density.
24 Citations
5 Claims
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1. A method for charging a secondary battery comprising a positive electrode, a negative electrode made of lithium, and an electrolyte, said method comprising the steps of:
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producing a pulsed current which has a predetermined repetition frequency from 50 Hz to 10 MHz, inclusive, and which has a positive pulse amplitude sufficient to produce a predetermined current density of from 1 μ
A/cm2 to 1 mA/cm2, inclusive, in said positive electrode, said pulsed current comprising a positive pulsed current followed by a negative pulsed current, said positive pulsed current having said positive pulse amplitude sufficient to produce said predetermined current density of from 1 μ
A/cm2 to 1 mA/cm2, inclusive, in said positive electrode, and said negative pulsed current having a negative pulse amplitude sufficient to produce a second current density less than said predetermined current density, said second current density not being greater than a quarter of said predetermined current density; andsupplying said pulsed current to said secondary battery to make the pulsed current flow between said positive electrode and said negative electrode through said electrolyte to thereby charge said secondary battery. - View Dependent Claims (2, 3, 4, 5)
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Specification