Stable cycling of lithium-sulfur batteries by optimizing the cycle condition

摘要: Abstract Lithium-sulfur (Li–S) batteries suffer from poor utilization of active material and short cycle life due to the complicated multi-step reaction mechanisms. Herein, three conditional cycling methods, i.e. asymmetrical cycling, constant voltage (CV) discharge partial are designed in order increase cyclability Li–S batteries. It is found that solid deposition process takes place during lower plateau major limiting step for achieving high capacity retention, cathode surface coverage can be deferred by applying an optimal discharge/charge rate CV cycling. The renders a specific ca. 700 mAh g−1 after 200 cycles, 30% higher than under symmetrical while enables full retention target 800 over 50 cycles. with low number phase transformation steps reduced at end also enhances cyclability. This work paves way understanding improving performance without increasing cost electrode design or changing configuration cell.