Journal
MATERIALS CHEMISTRY FRONTIERS
Volume 5, Issue 6, Pages 2791-2797Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0qm01134g
Keywords
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Funding
- National Natural Science Foundation of China [21825501, 21808125, 21808121, U1801257]
- National Key Research and Development Program [2016YFA0202500, 2016YFA0200102]
- Tsinghua University Initiative Scientific Research Program
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The study demonstrates that the addition of glycolide (GL) electrolyte additive can prolong the cycle life of ultrathin Li metal anodes and improve the uniformity of Li deposition.
Stable lithium (Li) metal anodes are a foundation stone for practical Li metal batteries. An ultrathin Li metal anode (<50 mu m) is the premise to realize high-energy-density Li metal batteries. However, the uneven Li plating/stripping induced by the unstable solid electrolyte interphase (SEI) leads to the rapid depletion of active Li and electrolyte, resulting in a poor cycle life of ultrathin Li metal anodes. Herein, an electrolyte additive, glycolide (GL), is proposed to prolong the cycle life of ultrathin Li metal anodes. GL additives decompose on the Li metal anode to enrich the organic components in the SEI. The uniformity of Li deposition is improved with the introduction of GL additives. Under practical conditions with an ultrathin Li metal anode (50 mu m) and a high loading LiNi0.5Co0.2Mn0.3O2 (NCM523) cathode (3.0 mA h cm(-2)), 175 cycles were achieved in Li|NCM523 cells with GL additives compared with 86 cycles without GL additives. This work further promotes the design of electrolyte additives for stabilizing ultrathin Li metal anodes.
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