Bendable Network Built with Ultralong Silica Nanowires as a Stable Separator for High-Safety and High-Power Lithium-Metal Batteries

Du, Qingchuan; Yang, Ming-Tong; Yang, Jike; Zhang, Pei; Qi, Ju-Quan; Bai, Ling; Li, Zhuang; Chen, Jianyu; Liu, Ruiqing; Feng, Xiang; Huang, Zhen-Dong; Masese, Titus; Ma, Yanwen; Huang, Wei

doi:10.1021/acsami.9b09722

Cited by 37 publications

(24 citation statements)

References 43 publications

(55 reference statements)

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“…Recently, intensive investigations on separator modification have been realized and applied in Li‐metal protection. [ 51,163–176 ] An advanced separator with high mechanical strength can prevent Li dendrites from penetrating it. In addition, the narrow pore size distribution and functionalities of modified separators can regulate homogenous Li‐ion flux near the electrode surface and thus promote uniform Li nucleation and growth.…”

Section: Porous Separatorsmentioning

confidence: 99%

Recent Progress of Porous Materials in Lithium‐Metal Batteries

et al. 2021

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Lithium‐metal batteries (LMBs) are regarded as one of the best choices for next‐generation energy storage devices. However, the low Coulombic efficiency, lithium dendrite growth, and volume expansion of lithium‐metal anodes are dragging LMBs out of successful commercialization. Herein, the application of various porous materials in LMBs is focused on. First, several representative works are summarized to highlight the recent key progress of porous materials in LMBs, categorized into current collectors, thin 3D “hosts,” protection layers, and separators. Then, the existing challenges are discussed and future research needs to present more thorough characterizations of porous materials are advocated for, such as their porosity, electric conductivity, specific surface area, and mass density, to elaborate on their positive influence on electrochemical performance. Finally, future strategies with porous materials to build long‐cycle‐life, high‐energy‐density lithium‐metal full cells toward realistic performance targets are envisioned.

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Section: Porous Separatorsmentioning

confidence: 99%

Recent Progress of Porous Materials in Lithium‐Metal Batteries

et al. 2021

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“…As compared with results across the published reports, the devices with the BNNTMs separator exhibit excellent Li dendritesuppressing ability to enable exceptional small overpotential ( Supplementary Fig. 13) and cycling stability with a cumulative lifetime capacity exceeding 4,000 mAh cm -2 , exceeding the lifetime capacity of typical LIBs (typically < 2,000 mAh cm -2 ) 44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60 (Fig. 4j) (Details are shown in Supplementary Table S3).…”

Section: Lithium-ion Transference Number (T LImentioning

confidence: 72%

Super Electrolyte-Philic Boron Nitride Nanotube Membranes as Highly Robust Separators for Lithium Batteries

Duan¹,

Shen²,

Zhu³

et al. 2020

Preprint

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The widespread deployment of lithium ion (Li+) batteries with increasing energy density entails a worsening safety concern. Among many contributing factors, the typical polymer separators are plagued with poor thermal stability,limited mechanical strength and lower Li+ transference number, and are prone to catastrophic failure when subjected to local thermalor mechanical stress (e.g., pierced by lithium dendrites). Herein, we report an all-inorganicnonwoven boron nitride nanotube membrane featuring exceptional chemical stability, thermal stability, fire resistance and mechanical flexibility. The resulting membranes show superior wettability to electrolyte to endow excellent Li+ transport properties with the lowest ionic resistance and the highest Li+ transference number (0.86) when compared with all commercial separators. They can thus function as highly robust separators for Li/Li symmetriccells with ultralow overpotential (8.5 mV) and exceptional reversibility for repeated lithium plating/stripping cycles for over 8000 hours, and for practical LiFePO4/Li cell with unusually high temperature stability. Our study defines a unique class of super electrolyte-philic ceramic separators with favorable mechanical strength, thermal stability and ion transfer properties for advanced lithium batteries.

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“…[107][108][109] In addition to HAP NWs, Al 2 O 3 and SiO 2 NWs with high thermal stability and good electrochemical stability were also investigated for constructing high-safety LIB separators. [92,110,111] For example, He et al developed a pure inorganic separator for LIBs based on Al 2 O 3 NWs. [110] The Al 2 O 3 NWs separator was flexible and with a pore size around 100 nm.…”

Section: Fire-resistant Separators and Electrodesmentioning

confidence: 99%

“…In another work, a bendable porous separator made from ultralong SiO 2 NWs was prepared for LIBs. [111] Thermogravimetry analysis (TGA) results showed that the SiO 2 NWs separator showed no weight loss up to 700 °C. Moreover, the highly porous nature (≈73% in porosity) and polar surface enabled the inorganic separator with excellent Reproduced with permission.…”

Section: Fire-resistant Separators and Electrodesmentioning

confidence: 99%

Thermal‐Responsive and Fire‐Resistant Materials for High‐Safety Lithium‐Ion Batteries

Li¹,

Wang²,

Zhu³

et al. 2021

Small

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is due to their high specific energy density, long cycling lifespan, and portability. [7][8][9][10] Currently, state-of-the-art LIBs (without packaging materials) can achieve a high specific energy density of ≈250 Wh kg −1 . Next-generation LiS and Li-air systems can further increase the battery energy densities beyond 600 and 900 Wh kg −1 , respectively. [11,12] With the energy density increasing, more attention should be paid to the safety of LIBs, as the chemical energy can be abruptly released in the forms of fires and explosions once the battery is not properly handled. [13][14][15][16][17][18] Currently, the safety issues are also regarded as one of the significant challenging barriers that limit the widespread adoption of LIBs for modern electrical vehicles. [19,20] A typical lithium-ion cell is composed of an anode, a cathode, liquid electrolytes, and a separator, [1] as illustrated in Figure 1A. The active materials are mixed with polymer binders and conductive carbon additives and then coated onto aluminum and copper foil current collectors to make the cathode and anode, respectively. Layered, spinel, and polyanion-type lithium-transitional metal oxides and phosphates including LiCoO 2 , LiMn 2 O 4 , LiFePO 4 , and their derivatives (LiMn x Ni y O 4 , LiNi 1−y−z Mn y Co z O 2 , etc.) have been used as cathode materials for LIBs due to their high lithium intercalation capacity and potential. [5] Graphite is the most frequently used anode material for LIBs because of its high abundance, low cost, and good reversibility. [21,22] Other materials such as carbon, [23] silicon, [24][25][26] and transition metal oxides-based materials with various structures and compositions have been studied as anodes for LIBs. [27][28][29] Some of them show promising capacity but there are still many challenges in scaled-up productions and practical applications. [30,31] For details of studies on structural design and performance optimization of the LIB anode materials, readers may refer to a comprehensive review published recently. [32] The liquid electrolyte provides a medium for fast Li + ions transport. [33,34] The separator is applied to prevent direct contact between the cathode and anode while permitting the ion transfer. [35][36][37][38] During the charging process, Li + ions are deintercalated from the cathode host and insert into the anode. On discharge, Li + ions migrate reversely from the above process, and electrons pass through the external circuit, supplying electricity [1] (Figure 1A). A passivation layer of solid-electrolyte-interphase (SEI) is generated on the anode surface during the initial few charging cycles, As one of the most efficient electrochemical energy storage devices, the energy density of lithium-ion batteries (LIBs) has been extensively improved in the past several decades. However, with increased energy density, the safety risk of LIBs becomes higher too. The frequently occurred battery accidents worldwide remind us that safeness is a crucial requirement for LIBs, especially in environments ...

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Bendable Network Built with Ultralong Silica Nanowires as a Stable Separator for High-Safety and High-Power Lithium-Metal Batteries

Cited by 37 publications

References 43 publications

Recent Progress of Porous Materials in Lithium‐Metal Batteries

Recent Progress of Porous Materials in Lithium‐Metal Batteries

Super Electrolyte-Philic Boron Nitride Nanotube Membranes as Highly Robust Separators for Lithium Batteries

Thermal‐Responsive and Fire‐Resistant Materials for High‐Safety Lithium‐Ion Batteries

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