揭示电池寿命的隐藏因素

Two new descriptors enable precise evaluation of rechargeable lithium-metal battery performance Bing Joe Hwang1,2,3 A lithium-metal electrode holds nearly 10 times the theoretical capacity (the maximum amount of electric charge per mass) of a graphite anode in traditional rechargeable lithium-ion batteries, promising electric vehicles that can go twice as far with much lighter batteries. However, a pure lithium-metal or lithium–metal alloy electrode is chemically unstable and has an unpredictable cycle life—that is, the total number of charge and discharge cycles (moving electrons and ions between electrodes) that a battery can perform before its capacity drops below a threshold. Consequently, commercialization of rechargeable lithium-metal batteries has not been achieved. On page 1314 of this issue, Li et al. …