Fluorinating Solid Electrolyte Interphase by Regulating Polymer–Solvent Interaction in Lithium Metal Batteries

Synergetic regulation of SEI mechanics and crystallographic orientation for stable lithium metal pouch cells

“…The stability of high-areal-capacity Li metal is critically associated with a stable SEI. The LiF-rich SEI exhibits tremendous potential in prolonging the cycling lifespan of the Li metal anode by suppressing continuous side reactions and enabling planar Li deposition rather than Li dendrite growth 23,38 . More importantly, the advantage of YP layer in our study is the spontaneous generation of LiF by in-situ chemical/ electrochemical reduction of YF 3 with deposited Li metal.…”

“…It is well known that LiF with high interfacial energy, high chemical stability, and low Li + diffusion barrier is generally regarded as an ideal SEI component to regulate Li deposition 22 . Therefore, constructing a LiF-rich SEI on the Li metal is a common strategy, and can promote uniform deposition [23][24][25][26] . However, the LiF-rich SEI is brittle, and has poor mechanical stability, which facilitating its rupture and causing huge volume fluctuation during repeated cycles.…”

Solid Electrolyte Interphase on Lithium Metal Anodes

“…This film can withstand the volume expansion of lithium anode while suppressing dendrite growth, resulting in stable long‐term cycling of large capacity LMBs (Figure 8 a). The LiFePO 4 |Li coin cell exhibits a capacity retention of 66.7 % after 600 cycles at 1 C, while the LiNi 0.8 Co 0.1 Mn 0.1 O 2 |Li pouch battery shows an initial capacity as high as 137.6 mAh g −1 and maintains 90.2 % of the initial capacity after 100 cycles at 0.2 C. By utilizing electrospinning technology, Jia‐Qi Huang's group fabricated a segmented polymer coating on the surface of lithium metal using polyacrylonitrile and 2‐(N‐3‐sulfopropyl‐N,N‐dimethylammonium)ethyl methacrylate [132] . The uniformly distributed polar functional groups in this coating interact with intermediate decomposition products of FEC, thereby promoting LiF formation.…”

A novel asymmetrical multilayered composite electrolyte for high-performance ambient-temperature all-solid-state lithium batteries

“…Generally, the SEI and CEI can be regulated by adding some trace additives to the electrolyte. 27,28 However, the polymer used in the SCE usually comprises polar functional groups that have potential to react with the additives and produce byproducts. [28][29][30] Therefore, a more rened approach involves the in situ generation of an ideal CEI and SEI via reactions between the SCE and cathode/anode.…”

“…27,28 However, the polymer used in the SCE usually comprises polar functional groups that have potential to react with the additives and produce byproducts. [28][29][30] Therefore, a more rened approach involves the in situ generation of an ideal CEI and SEI via reactions between the SCE and cathode/anode. For example, LiZr 2 (PO 4 ) 3 has been applied in ASSLBs to interact with the Li anode to generate a SEI lm containing Li 8 ZrO 6 and Li 3 P which wets the Li anode and electrolyte in turn, and thus the LiFePO 4 (LFP)//Li ASSLBs with this design show good cyclability and rate capability.…”