Nanocomposite intermediate layers formed by conversion reaction of SnO2 for Li/garnet/Li cycle stability

Chen, Yue; He, Minghui; Zhao, Ning; Fu, Jingming; Huo, Hanyu; Zhang, Tao; Li, Yiqi; Xu, Fangfang; Guo, Xiangxin

doi:10.1016/j.jpowsour.2019.02.085

Cited by 69 publications

(40 citation statements)

References 34 publications

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“…Cross-sectional SEM images of LLZTO show a transgranular fracture morphology without obvious grain boundaries, leading to a high relative density of over 99.5% (Supplementary Fig. 1a ) 37 . The X-ray diffraction (XRD) pattern, shown in Supplementary Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The impedance spectrum of the Li/LLZTO/Li cell exhibits one large semicircle. The starting point of the spectrum corresponds to the bulk resistance of the LLZTO, while the semicircle corresponds to the interfacial resistance between LLZTO and Li metal 37 . In an ideal situation, the charge transfer across two Li/LLZTO interfaces should be identical in a symmetric cell.…”

Section: Resultsmentioning

confidence: 99%

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A flexible electron-blocking interfacial shield for dendrite-free solid lithium metal batteries

et al. 2021

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Solid-state batteries (SSBs) are considered to be the next-generation lithium-ion battery technology due to their enhanced energy density and safety. However, the high electronic conductivity of solid-state electrolytes (SSEs) leads to Li dendrite nucleation and proliferation. Uneven electric-field distribution resulting from poor interfacial contact can further promote dendritic deposition and lead to rapid short circuiting of SSBs. Herein, we propose a flexible electron-blocking interfacial shield (EBS) to protect garnet electrolytes from the electronic degradation. The EBS formed by an in-situ substitution reaction can not only increase lithiophilicity but also stabilize the Li volume change, maintaining the integrity of the interface during repeated cycling. Density functional theory calculations show a high electron-tunneling energy barrier from Li metal to the EBS, indicating an excellent capacity for electron-blocking. EBS protected cells exhibit an improved critical current density of 1.2 mA cm−2 and stable cycling for over 400 h at 1 mA cm−2 (1 mAh cm−2) at room temperature. These results demonstrate an effective strategy for the suppression of Li dendrites and present fresh insight into the rational design of the SSE and Li metal interface.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

A flexible electron-blocking interfacial shield for dendrite-free solid lithium metal batteries

et al. 2021

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“…Cross-sectional scanning electron microscope (SEM) images of LLZTO show a transgranular fracture morphology without obvious grain boundaries, leading to a high relative density of over 99.5% (Fig. S1a) 38 . The XRD pattern shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…at 25 o C. The impedance spectrum of the Li/LLZTO/Li cell exhibits one large semicircle. The starting point of the spectrum corresponds to the bulk resistance of the LLZTO, while the semicircle corresponds to the interfacial resistance between LLZTO and Li metal38 . In an ideal situation, the charge transfer across two Li/LLZTO interfaces should be identical in a symmetric cell.…”

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confidence: 99%

A Flexible Electron-blocking Interfacial Shield for Dendrite-free Solid Lithium Metal Batteries

Huo

Gao

Zhao

et al. 2020

Preprint

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Solid-state batteries (SSBs) are considered to be the next-generation lithium-ion battery technology due to their enhanced energy density and safety. However, the high electronic conductivity of solid-state electrolytes (SSEs) leads to Li dendrite nucleation and proliferation. Uneven electric-field distribution resulting from poor interfacial contact can further promote dendritic deposition and lead to rapid short circuiting of SSBs. Herein, a flexible electron-blocking interfacial shield (EBS) is proposed to protect garnet electrolytes from the electronic degradation. The EBS formed by an in-situ substitution reaction can not only increase lithiophilicity but also stabilize the Li volume change, maintaining the integrity of the interface during repeated cycling. Density functional theory calculations show a high electron-tunneling energy barrier from Li metal to the EBS, indicating an excellent capacity for electron-blocking. EBS protected cells exhibit an improved critical current density of 1.2 mA cm-2 and stable cycling for over 400 h at 1 mA cm-2 (1 mAh cm-2) at room temperature. These results demonstrate an effective strategy for the suppression of Li dendrites and present fresh insight into the rational design of the SSE and Li metal interface.

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“…The other group is materials that can react with Li metal, therefore increasing the wettability of Li. The materials include Al 2 O 3 , [46] ZnO, [42] SnO 2 , [75] SnF 2 , [76] MoS 2 , [77] AgNO 3 , [78] Cu 3 N, [79] and Cu 6 Sn 5 . [80] They play a similar role in increasing the wettability, so here we take Al 2 O 3 as an example.…”

Section: Artificial Interlayermentioning

confidence: 99%

Interfaces in Garnet‐Based All‐Solid‐State Lithium Batteries

Wang

Zhu

et al. 2020

Advanced Energy Materials

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liquid electrolytes. ASSLBs exhibit overwhelming advantages as follows: 1) No electrolyte leakage. The most obvious advantage of ASSLBs is the avoidance of electrolyte leakage, and related issues such as fire hazard, electrical short circuit and corruption. In addition, ASSLBs do not need advance sealants, pressurizing electrolyte, and flame retardant failsafe. [1,2] 2) No thermal runaway. Thermal runaway will cause the rise of internal temperature, pressure, and vent of flammable gases in conventional LIBs, at a risk of explosion and shrapnel. [3,4] ASSLBs avoid the use of organic electrolytes and prevent the thermal runaway for a large extent. [5] 3) High resistance to lithium dendrite. The lithium dendrite may form during deposition process and penetrate through the separator, potentially cause a short circuit in conventional LIBs. [6] ASSLBs using solid electrolytes (SEs) with high shear modulus are expected to prevent/alleviate the dendrite penetration and extend the cell life. 4) Higher energy density. [7] The conventional LIBs are not suitable for the application of high voltage cathode and lithium metal anode because of narrow electrochemical window of liquid electrolytes, as well as failure in preventing lithium dendrite. ASSLBs facilitate the application of high voltage cathode materials and high energy density lithium metal anode, therefore increasing the energy density of the whole cell. Figure 1 shows the scheme of a typical ASSLB. Similar with conventional LIBs, the main components of ASSLB are cathode, SE, and anode. The distinctive component is SE, and its properties support the great advantages of ASSLBs. These properties include stability at ultrahigh and ultralow temperature, high mechanical strength, [8] wider electrochemical window (with passivation), and so on. [9-11] According to the category of SE, ASSLBs are divided into polymer-based, oxide-based, and sulfide-based systems, corresponding to the polymer, oxide, and sulfide electrolytes, respectively. Therein, oxide electrolytes exhibit moderate ionic conductivity, high shear modulus, and better stability with atmosphere and electrodes, are promising candidates for ASSLB. Specifically, oxide electrolytes are classified into LISICON (Li 14 ZnGe 4 O 16), NASICION (LiTi 2 (PO 4) 3), perovskite (Li 3x La 0.67-x □ 0.33-2x TiO 3), garnet (Li 3-7 LnMO 12 , Ln = Y, Pr, Nd, La, Sm-Lu, M = Zr, Sb, W, etc.), and so on based on their structure. Without reductive Ge, Ti elements in the composition, garnets are normally considered most promising among oxide electrolytes. [12,13] Garnet-type electrolytes in the formula of Li 3-7 Ln 3 M 2 O 12 , show a space group 3 Ia d. Lithium content ranges from 3 to 7 based on the substitution elements at Ln and M sites. [14,15] All-solid-state lithium batteries (ASSLBs) are considered to be the nextgeneration energy storage system, because of their overwhelming advantages in energy density and safety compared to conventional lithium ion batteries. Among various systems, garnet-based ASSLBs are one of the most promis...

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Nanocomposite intermediate layers formed by conversion reaction of SnO2 for Li/garnet/Li cycle stability

Cited by 69 publications

References 34 publications

A flexible electron-blocking interfacial shield for dendrite-free solid lithium metal batteries

A flexible electron-blocking interfacial shield for dendrite-free solid lithium metal batteries

A Flexible Electron-blocking Interfacial Shield for Dendrite-free Solid Lithium Metal Batteries

Interfaces in Garnet‐Based All‐Solid‐State Lithium Batteries

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