A cation-anion synergetic additive achieving long-term stability of lithium metal anode
2022; Elsevier BV; Volume: 451; Linguagem: Inglês
10.1016/j.cej.2022.138580
ISSN1873-3212
AutoresZhipeng Jiang, Chen Li, Jisheng Mo, Hanxu Yang, Haiwen Li, Qingan Zhang, Yongtao Li,
Tópico(s)Advanced Battery Technologies Research
ResumoLithium metal anode (LMA) has been regarded as the “Holy grail” among next-generation anode materials, which are severely enslaved to its poor cycling stability. Many problems such as Li dendrites and dead Li are involved in the cycling process, thus a protection strategy with a single function is difficult to achieve long-term stability of LMA. Herein, we developed a cation-anion synergetic additive, cesium triiodide (CsI3), to inhibit Li dendrite growth and eliminate dead Li. The addition of Cs+ could play a role in electrostatic shielding to homogenize the deposition progress of Li+, and the further introduction of I3− could react with the inactive Li2O on the surface of the Li to revitalize dead Li. The CsI3-added carbonate or ether electrolyte exhibited excellent cycling stability in a series of electrochemical performance tests, such as the Li-Cu half cell (over 600 cycles), Li-LiFePO4 (LFP, 11.5 mg cm−2, 50 μm Li, 1 μL mg−1 electrolyte) full cells (82% retention over 450 cycles), and Cu-LFP anode-free cells (80% retention over 110 cycles).
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