ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 34
·期 4
·2306399
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IF 19
Haoyang Jiang,Junqing Liu,Bin Tang,Zhendong Yang,Xinghui Liang,Xinyu Yu,Yirong Gao,Jinping Wei,Zhen Zhou
The practical implementation of garnet-type solid electrolytes, such as Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (LLZTO), faces the significant challenge of Li dendrites. Though artificial interfacial strategies are effective in dendrite suppression, further investigation is needed to understand the mechanism of homogeneous Li deposition and its practicability under real-world conditions. Herein, a bilayer interface is constructed to address these issues. Such a bilayer interface consists of one conformal Li 2 O-rich layer, generated by rubbing LLZTO pellets inside molten Li with low-dose In 2 O 3 , and another Li 2 O layer deposited through atomic layer deposition (ALD). The regulatory effect of the initial Li 2 O-rich layer on achieving uniform Li deposition is explored, and the critical current density is enhanced to 2.4 mA cm −2 . However, simple interfacial strategy is insufficient to prevent anodic degradation for cycling at room temperature without stack pressure, leading to increased current leakage and directly reducing Li + within the electrolyte. After insulating it with a second ALD-Li 2 O layer that minimally hampers ionic conduction, the Li/Li symmetric cells achieve long cycling life exceeding 1000 h at 0.5 mA cm −2 and maintain stable operation even at 2 mA cm −2 . This work provides valuable insights for interfacial strategies towards practical solid-state batteries.
研究领域:
材料科学
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电化学
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电池技术
✓ 已验证
DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2024
·
IF 4.7
Liu-bin SONG,Tian-yuan LONG,Min-zhi XIAO,Min LIU,Ting-ting ZHAO,Yin-jie KUANG,Lin JIANG,Zhong-liang XIAO
A composite solid electrolyte comprising a Cu−Al bimetallic metal-organic framework (CAB), lithium salt (LiTFSI) and polyethylene oxide (PEO) was fabricated through molecular grafting to enhance the ionic conductivity of the PEO-based electrolytes. Experimental and molecular dynamics simulation results indicated that the electrolyte with 10 wt.% CAB (PL-CAB-10%) exhibits high ionic conductivity (8.42×10 −4 S/cm at 60 °C), high Li + transference number (0.46), wide electrochemical window (4.91 V), good thermal stability, and outstanding mechanical properties. Furthermore, PL-CAB-10% exhibits excellent cycle stability in both Li−Li symmetric battery and Li/PL-CAB- 10%/LiFePO 4 asymmetric battery setups. These enhanced performances are primarily attributable to the introduction of the versatile CAB. The abundant metal sites in CAB can react with TFSI − and PEO through Lewis acid–base interactions, promoting LiTFSI dissociation and improving ionic conductivity. Additionally, regular pores in CAB provide uniformly distributed sites for cation plating during cycling.
研究领域:
材料科学
·
电化学
·
电池技术
·
聚合物科学
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2022
·
IF 13.599
Shan Yi,Zhe Su,Wanyu Zhang,Hongli Chen,Yayun Zhang,Bo Niu,Donghui Long
Lithium metal batteries are among the strong contenders to satisfy the ever-increasing needs of energy storage systems, which however suffer from poor composition of the solid electrolyte interphase (SEI) layer and uncontrolled Li dendrites formation. In this regard, we report on the design of an ion-released MgI 2 -doped polyacrylonitrile (PAN) based nanofiber (MPANF) separator, which can lead to conducive SEI layer and dendrite-free Li anode. The combination of the lithophilic MgI 2 nanoparticles with polarized PAN matrix comprehensively functions as a high-compatible interpenetrating network to homogenize ionic transportation and confront dendrite growth. The released I ions introduce the high-ion-conductivity LiI into SEI layer, which could induce the formation of favorable and protective interface layer in the early stage, as embodied in the enrichment of advantageous components such as LiN x O y , Li 2 O, LiF, and Li 3 N. Profited from the high-affinity MPANF separator, the Li||Li symmetric cell achieves an ultra-low voltage hysteresis of 46 mV with an extended lifespan of 580 h. And a prolonged lifetime of 590 cycles with an enhanced specific capacity of 140.1 mAh g −1 and the Coulombic efficiency of 96.2% at 1 C can be obtained in full cells. This work may offer a facile and high-affinity alternative to traditional polymeric separators for high-performance and dendrite-free Li metal batteries.
研究领域:
能源存储系统
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材料科学
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电池技术
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电化学
✓ 已验证
产品关联
DOI
高影响因子
NEW CARBON MATERIALS
·
2023
·
IF 5.7
Xian-lan Ke,Yu-heng Lu,Jin-lun Wu,Ding-cai Wu
We report the fabrication of vulcanized cross-linked polystyrene grafted on carbon nanotubes (CNTs) for use as an advanced three-dimensional Li host. First, polystyrene was grafted from Br-modified CNTs to form brush-like structure by surface-initiated atom-transfer radical polymerization. Polystyrene grafted on carbon nanotubes was then cross-linked using a Friedel-Crafts reaction and finally vulcanized with sulfur. Vulcanized cross-linked polystyrene grafted on carbon nanotubes was used as a support for the Li metal, and its macro-, meso- and microporous structure increased Li ion transport, buffered the volume changes of the Li anode, and provided a high specific surface area to reduce local current density, which assisted rapid and uniform Li plating/stripping. At the same time, the homogenously distributed sulfur in the support reacted with Li to produce a Li 2 S-containing SEI layer, while the CNTs provided conductive pathways for the rapid transmission of electrons. As a result, a Li|Li symmetric cell using this anode material and a Cu current collector had a stable cycling performance of more than 500 h at a current density of 1 mA cm −2 . When LiFePO 4 was used as the cathode, a full cell had a high discharge capacity of 101 mAh g −1 with a capacity retention of 77% after 600 cycles at 1 C.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
Energy Storage Materials
·
2023
·
IF 20.4
Xiaoyu Zhang,Jinhuan Wang,Dongqi Hu,Wei Du,Chuanxin Hou,Huiyu Jiang,Yuting Wei,Xiao Liu,Fuyi Jiang,Jianchao Sun,Hua Yuan,Xiaoyu Huang
The large scale application of solid state lithium metal batteries based on NASICON-type Li 1+x Al x Ti 2-x (PO 4 ) 3 (LATP) electrolyte has been hindered by insufficient ion conductivity and interface instability due to the spontaneous Ti 4+ reduction reaction between Li metal and LATP. To address these issues, Li 1.7 Al 0.3-x Bi x Ti 1.7 (PO 4 ) 3 (0 ≤ x ≤ 0.03) (LABTP) electrolytes were prepared, and the influence of Bi substitution on the microstructure and conductivity of LATP were investigated. Suitable amount of Bi substitution accelerates densification and improves the ionic conductivity . Furthermore, unlike commonly used polyethylene oxide (PEO) and polyvinylidene difluoride (PVDF), polyvinylbutyral (PVB)-based quasi-solid electrolytes with LABTP is first-time proposed to improve the compatibility and stability of the LATP/Li interface. The synergistic effect of Bi doping and PVB reduces the reduction reaction of Ti 4+ . Small voltage hysteresis is observed in the corresponding Li||Li symmetric cells. The solid-state Li|LABTP@PVB|LiFePO 4 full cell can deliver a high capacity of 146.2 mAh g −1 and a stable cycling performance without reduction after 200 cycles.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）