Recently however, questions have been raised about the role of LiF in the growth of columnar lithium , with similar structures also being observed in (non-hydrolysing) LiTFSI and LiNO3 electrolytes. As the bulk of the aforementioned references advocate the formation of a LiF rich SEI mediated by HF present in the electrolyte as the cause for columnar growth, a more complete understanding of the mechanism responsible for columnar lithium growth is required for further optimization for lithium metal anodes.