Method of charging a lithium-sulphur cell
View Patent ↗A method for charging a lithium-sulphur cell, said method comprising: •determining the discharge capacity, Q n , of the cell during a charge-discharge cycle, n, •calculating the value of a*Q n, where a=1.05 to 1.4, and, •in a later charge-discharge cycle, n+x, where x is an integer of 1 to 5, charging the cell to a capacity Q n+x that is equal to a*Q n .
1. A method for charging a lithium-sulphur cell, said method comprising:
coupling the lithium-sulphur cell to a battery management system, wherein the battery management system comprises a means for charging the cell, and a means for determining the discharge capacity,
wherein the discharge capacity is determined by:
determining the discharge capacity, Q n , of the lithium-sulphur cell during a charge-discharge cycle, n,
calculating the value of a*Q n , where a=1.05 to 1.4, and,
in a later charge-discharge cycle, n+x, where x is an integer of 1 to 5, charging the lithium-sulphur cell to a discharge capacity, Q n+x , that is equal to a*Q n
determining a threshold discharge capacity, Q t , of the cell, wherein the threshold capacity is the discharge capacity at the 5th cycle or sooner, and
when the discharge capacity of the cell, Q m , falls below 0.8 Q t , charging the cell to (i) b*Qt, when b is 1.05 to 1.3, or to (ii) 2.45V, whichever is lower.
2. The method of claim 1 , wherein x is an integer selected from 1, 2 or 3.
3. The method of claim 1 , wherein x is 1.
4. The method of claim 1 , wherein a is a value selected from 1.1 to 1.3.
5. The method of claim 1 , wherein a is selected from 1.1 to 1.2.
6. The method of claim 1 , wherein the threshold capacity of the lithium-sulphur cell is the capacity during its first discharge cycle.
7. The method of claim 1 , wherein b is 1.1 to 1.2.