Lithium ion secondary battery, separator, battery pack and...

H - Electricity – 01 – M

Patent

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Details

H01M 10/0525 (2010.01) H01M 4/13 (2010.01) H01M 2/14 (2006.01) H01M 2/16 (2006.01) H01M 10/44 (2006.01)

Patent

CA 2373904

A lithium ion secondary battery comprising a positive electrode, a negative electrode, a separator and a nonaqueous electrolyte, wherein the separator consists essentially of a porous sheet, the positive electrode active material and the negative electrode active material can be reversibly doped and dedoped such that, where Qp (mAh) is an electric charge necessary for causing total lithium contained in the positive electrode to be dedoped and Qn (mAh) is an electric charge necessary for causing lithium to fully dope the negative electrode, Qp > Qn, and when the battery is charged at a charging current Ic (mA) in a range of 0.2Qn/h < Ic < 2Qn/h, in a range of an electric charge for charging Qc (mAh) of 1 < Qc/Qn < Qp/Qn, doping of the positive electrode by lithium is started through lithium particles produced on the negative electrode by charging of the battery and is continued up to Qc > Qp.

Pile secondaire à ions de lithium comprenant une anode, une cathode, un séparateur et un électrolyte non aqueux; le séparateur est sensiblement constitué d'une feuille poreuse, les matières actives de l'anode et de la cathode peuvent être dopés de façon réversible avec du lithium (le lithium peut aussi être enlevé), la quantité totale Qp (en mAh) de lithium dans l'anode et la quantité Qn (mAh) de lithium avec lequel on peut doper la cathode correspondant au rapport Qp>Qn. Le dopage de l'anode avec du lithium à travers l'espèce de lithium produite sur la cathode lorsque la pile est chargée commence au moment où le chargement est effectué avec un courant de chargement Ic (mA) avec la condition 0,2 Qn < Ic 2 Qn et quand la quantité d'électricité Qc (en mAh) est déterminée par 1<Qc/Qn<Qp/Qn; il se poursuit jusqu'à ce que Qc>Qp.

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