Fluoroethylene Carbonate Additives to Render Uniform Li Deposits in Lithium Metal Batteries

Zhang, Xueqiang; Cheng, Xin‐Bing; Chen, Xiang; Yan, Chong; Zhang, Qiang

doi:10.1002/adfm.201605989

Cited by 1,237 publications

(919 citation statements)

References 81 publications

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“…The Li 1s spectra (Figure 3h,k) exhibit three characteristic peaks at 56.2, 55.3, and 54.5 eV ascribed to LiF, Li 2 CO 3 , and ROCO 2 Li, due to the reaction of carbonate electrolyte with Li metal. It is reported that LiF could contribute to the formation of a stable and uniform SEI layer and suppressing the Li dendrite growth, [16,37,38] resulting in stable Li plating/stripping cycling. [35,36] It can be seen that the relative amount of LiF is increased by the use of the hybrid electrolyte compared with the separator.…”

Section: Doi: 101002/advs201802353mentioning

confidence: 99%

High‐Rate and Large‐Capacity Lithium Metal Anode Enabled by Volume Conformal and Self‐Healable Composite Polymer Electrolyte

et al. 2019

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The widespread implementation of lithium‐metal batteries (LMBs) with Li metal anodes of high energy density has long been prevented due to the safety concern of dendrite‐related failure. Here a solid–liquid hybrid electrolyte consisting of composite polymer electrolyte (CPE) soaked with liquid electrolyte is reported. The CPE membrane composes of self‐healing polymer and Li + ‐conducting nanoparticles. The electrodeposited lithium metal in a uniform, smooth, and dense behavior is achieved using a hybrid electrolyte, rather than dendritic and pulverized structure for a conventional separator. The Li foil symmetric cells can deliver remarkable cycling performance at ultrahigh current density up to 20 mA cm −2 with an extremely low voltage hysteresis over 1500 cycles. A large areal capacity of 10 mAh cm −2 at 10 mA cm −2 could also be obtained. Furthermore, the Li|Li 4 Ti 5 O 12 cells based on the hybrid electrolyte achieve a higher specific capacity and longer cycling life than those using conventional separators. The superior performances are mainly attributed to strong adhesion, volume conformity, and self‐healing functionality of CPE, providing a novel approach and a significant step toward cost‐effective and large‐scalable LMBs.

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Section: Doi: 101002/advs201802353mentioning

confidence: 99%

High‐Rate and Large‐Capacity Lithium Metal Anode Enabled by Volume Conformal and Self‐Healable Composite Polymer Electrolyte

et al. 2019

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“…19 Another critical problem with Li-ions is that they may suffer the effect of plating instead of alloying with the Si, triggering the formation of dendrites, which might produce internal short circuits in the battery. 20 Over the years several investigations have been done on how to prevent the growth of dendrites in a battery, [21][22][23][24] but only a few theoretical studies of this phenomenon have been reported 25,26 and despite them, the exact mechanisms of growing dendrite are still elusive. 9,27 As mentioned before, Si anodes swell about 300% and hard SEI such as LiF most likely crack due to such expansion, allowing Li-ions to be reduced and then nucleate into the cracks forming dendrites.…”

Section: Introductionmentioning

confidence: 99%

Dendrite formation in silicon anodes of lithium-ion batteries

Selis

Seminario

2018

RSC Adv.

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Rechargeable lithium-ion batteries require a vigorous improvement if we want to use them massively for high energy applications. Silicon and metal lithium anodes are excellent alternatives because of their large theoretical capacity when compared to graphite used in practically all rechargeable Li-ion batteries.However, several problems need to be addressed satisfactorily before a major fabrication effort can be launched; for instance, the growth of lithium dendrites is one of the most important to take care due to safety issues. In this work we attempt to predict the mechanism of dendrite growth by simulating possible behaviors of charge distributions in the anode of an already cracked solid electrolyte interphase of a nanobattery, which is under the application of an external field representing the charging of the battery; thus, elucidating the conditions for dendrite growth. The extremely slow drift velocity of the Li-ions of $1 mm per hour in a typical commercial Li-ion battery, makes the growth of a dendrite take a few hours; however, once a Li-ion arrives at an active site of the anode, it takes an extremely short time of $1 ps to react. This large difference in time-scales allows us to perform the molecular dynamics simulation of the ions at much larger drift velocities, so we can have valuable results in reasonable computational times. The conditions before the growth are assumed and conditions that do not lead to the growth are ignored. We performed molecular dynamics simulations of a pre-lithiated silicon anode with a Li : Si ratio of 21 : 5, corresponding to a fully charged battery. We simulate the dendrite growth by testing a few charge distributions in a nanosized square representing a crack of the solid electrolyte interphase, which is where the electrolyte solution comes into direct contact with the LiSi alloy anode.Depending on the selected charge distributions for such an anode surface, the dendrites grow during the simulation when an external field is applied. We found that dendrites grow when strong deviations of charge distributions take place on the surface of the crack. Results from this work are important in finding ways to constrain lithium dendrite growth using tailored coatings or pre-coatings covering the LiSi alloy anode.

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“…These C-containing species could be derived from the reductions of TFSI − anions, DME, and FEC, [29,30] resulting in the formation of organic components as observed in TEM ( Figure S4a, Supporting Information). The interpeak distance shows a typical ∆metal = 6.0 eV, proving the presence of metallic Ag.…”

Section: Li-ag-lif Surface For LI Metal Protectionmentioning

confidence: 99%

Enhanced Stability of Li Metal Anodes by Synergetic Control of Nucleation and the Solid Electrolyte Interphase

Peng

Song

Huai

et al. 2019

Advanced Energy Materials

112

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Use of a protective coating on a lithium metal anode (LMA) is an effective approach to enhance its coulombic efficiency and cycling stability. Here, a facile approach to produce uniform silver nanoparticle‐decorated LMA for high‐performance Li metal batteries (LMBs) is reported. This effective treatment can lead to well‐controlled nucleation and the formation of a stable solid electrolyte interphase (SEI). Ag nanoparticles embedded in the surface of Li anodes induce uniform Li plating/stripping morphologies with reduced overpotential. More importantly, cross‐linked lithium fluoride‐rich interphase formed during Ag+ reduction enables a highly stable SEI layer. Based on the Ag‐LiF decorated anodes, LMBs with LiNi1/3Mn1/3Co1/3O2 cathode (≈1.8 mAh cm−2) can retain >80% capacity over 500 cycles. The similar approach can also be used to treat sodium metal anodes. Excellent stability (80% capacity retention in 10 000 cycles) is obtained for a Na||Na3V2(PO4)3 full cell using a Na‐Ag‐NaF/Na anode cycled in carbonate electrolyte. These results clearly indicate that synergetic control of the nucleation and SEI is an efficient approach to stabilize rechargeable metal batteries.

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Fluoroethylene Carbonate Additives to Render Uniform Li Deposits in Lithium Metal Batteries

Cited by 1,237 publications

References 81 publications

High‐Rate and Large‐Capacity Lithium Metal Anode Enabled by Volume Conformal and Self‐Healable Composite Polymer Electrolyte

High‐Rate and Large‐Capacity Lithium Metal Anode Enabled by Volume Conformal and Self‐Healable Composite Polymer Electrolyte

Dendrite formation in silicon anodes of lithium-ion batteries

Enhanced Stability of Li Metal Anodes by Synergetic Control of Nucleation and the Solid Electrolyte Interphase

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