JOURNAL OF POWER SOURCES
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2022
·
IF 9.794
Yifeng Cai,Caixia Liu,Zhiao Yu,Haomin Wu,Yaoda Wang,Wencan Ma,Qiuhong Zhang,Xudong Jia
A series of flexible and highly conductive quasi-solid single-ion polymer electrolytes (abbreviated as PU-TFMSI) based on lithium sulfonimide are presented. Owing to the crosslinked structure with three types of segments (hard segment, soft segment and Li rich segment), PU-TFMSI displays a stretchability of 1350% and toughness of 13.6 MJ m −3 . These PU-TFMSI single-ion electrolytes deliver high ionic conductivity over 1.3 × 10 −4 S cm −1 at ambient temperature, a wide electrochemical stability window (up to 5.0 V vs Li + /Li), a high lithium transfer number (LTN ∼ 0.9), and good compatibility with electrodes. The LiFePO 4 /PU-TFMSI-2/Li coin cell exhibits stable cycling with an average Coulombic efficiency of 99.58% and superior rate performance. Furthermore, the LiFePO 4 //Li soft pouch cell with PU-TFMSI-2 single-ion electrolyte maintains functionality under bending. The flexible single-ion polymer electrolytes designed in this study have the potential to be applied in flexible devices and stretchable 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
Journal of Energy Storage
·
2024
·
IF 8.9
Jian Ma,Yueyue Wu,Lei Dong,Mengyue Yu,Zhendong Zhu,Le Zhang,Linchao Zhang,Hongfa Xiang
Cathode–electrolyte integration via in-situ polymerization is an effective strategy to reduce interfacial resistance in solid-state/quasi-solid-state lithium batteries ; however, ion conduction in the fraction of polymer electrolyte is still to be enhanced. Herein, we demonstrate a separator-free cathode–electrolyte integrated structure employing a novel poly(di(ethylene glycol) ethyl ether acrylate)-based quasi-solid polymer electrolyte (LiTFSI-poly(DEGA)-FEC QSPE, denoted as PDEGA-QSPE), prepared via UV-assisted in-situ polymerization. Poly(DEGA) as a linear polymer contains abundant ethylene oxide (EO) segments in its branched chain, exhibiting excellent flexibility and high adhesion. Benefited from the flexible molecular structure, PDEGA-QSPE exhibits a glass transition temperature ( T g ) as low as around −68 °C and a good room-temperature ionic conductivity of 2.3 × 10 −4 S cm −1 , and it also shows an oxidative potential up to 4.7 V. The LiFePO 4 |PDEGA-QSPE|Li battery possesses an initial capacity of 149.2 mAh g −1 and a capacity retention of 92.5 % after 300 cycles at 0.2 C under room temperature, and poly(DEGA)-based QSPE also has the potential to be applied to the high-voltage NCM811||Li battery. Compared with widely-employed monomers for in-situ polymerization such as poly(ethylene glycol) diacrylate (PEGDA), poly(DEGA) possesses remarkably improved flexibility and ion conduction capability, exhibiting broad research and application prospects.
研究领域:
材料科学
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电化学
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能源存储
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电池技术
✓ 已验证
DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-10
·
IF 16.6
Jin Chengbin,Huang Yiyu,Li Lanhang,Wei Guoying,Li Hongyan,Shang Qiyao,Ju Zhijin,Lu Gongxun,Zheng Jiale,Sheng Ouwei,Tao Xinyong
Reactive negative electrodes like lithium (Li) suffer serious chemical and electrochemical corrosion by electrolytes during battery storage and operation, resulting in rapidly deteriorated cyclability and short lifespans of batteries. Li corrosion supposedly relates to the features of solid-electrolyte-interphase (SEI). Herein, we quantitatively monitor the Li corrosion and SEI progression (e.g., dissolution, reformation) in typical electrolytes through devised electrochemical tools and cryo-electron microscopy. The continuous Li corrosion is validated to be positively correlated with SEI dissolution. More importantly, an anti-corrosion and interface-stabilizing artificial passivation layer comprising low-solubility polymer and metal fluoride is designed. Prolonged operations of Li symmetric cells and Li | |LiFePO 4 cells with reduced Li corrosion by ~74% are achieved (0.66 versus 2.5 μAh h −1 ). The success can further be extended to ampere-hour-scale pouch cells. This work uncovers the SEI dissolution and its correlation with Li corrosion, enabling the durable operation of Li metal batteries by reducing the Li loss.
研究领域:
材料科学
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电化学
·
电池技术
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Di Zhang,Mengmeng Zhang,Yingsong Yu,Shuting Liang,Yi Hu
Composite electrolyte membranes with 3D nanofiber network structure, which can adjust internal stress to achieve cyclic stability, has been proved to play an important role in the cycle process of lithium metal batteries . However, its application is greatly impeded by the inherent instability interface. Here, we have created an excellent ion transport system through simple interface engineering design. The system weakens the interaction between PEO and Li + via a direct interfacial driving mechanism that establishes the ion bonds (Li-O/Zn-O) between LLZO/ZnO and PEO respectively, thereby achieving stable ion transport. As a result, Li | LPZ-5 CSE | Li battery displays highly stable Li plating/stripping cycling for over 1000 h at 0.1 mA cm −2 . In addition, lithium metal batteries (LMBs) based on LiFePO 4 cathode can stably cycle for 250 cycles with a specific capacity of 151.9 mAh g −1 (50 °C, 0.2 C). This work provides a straightforward and effective strategy that employs the stable ion transfer process at molecular-level to construct a self-supported membrane, which is positive to the development of long-cycle-life LMBs.
研究领域:
材料科学
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电化学
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电池技术
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纳米技术
✓ 已验证
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
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电化学
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电池技术
✓ 已验证
DOI
高影响因子
Science China-Technological Sciences
·
2022
·Vol. 65
·期 10
·2369-2379
·
IF 3.903
Zhang WenJing,Li SenLin,Zhang YuRong,Wang XingHui,Liu JingDong,Zheng YuanHui
The practical applications of solid-state electrolytes in lithium-ion batteries (LIBs) are hindered by their low ionic conductivity and high interfacial resistance. Herein, an ethoxylated trimethylolpropane triacrylate based quasi-solid-state electrolyte (ETPTA-QSSE) with a three-dimensional (3D) network is prepared by a one-step in-situ photopolymerization method. The 3D network is designed to overcome the contradiction between the plasticizer-related ionic conductivity and the thickness-dependent mechanical property of quasi-solid-state electrolytes. The ETPTA-QSSE achieves superb room-temperature ionic conductivity up to 4.55×10 −3 S cm −1 , a high lithium ion transference number of 0.57, along with a wide electrochemical window of 5.3 V ( vs. Li + /Li), which outperforms most ever of the reported solid-state electrolytes. Owing to the robust network structure and the cathode-electrolyte integrated electrode design, Li metal symmetrical cells show reduced interface resistance and reinforced electrode/ electrolyte interface stability. When applying the ETPTA-QSSE in LiFePO 4 ∥Li cells, the quasi-solid-state cell demonstrates an enhanced initial discharge capacity (155.5 mAh g −1 at 0.2 C) accompanied by a high average Coulombic efficiency of greater than 99.3%, offering capacity retention of 92% after 200 cycles. Accordingly, this work sheds light on the strategy of enhancing ionic conductivity and reducing interfacial resistance of quasi-solid-state electrolytes, which is promising for high-voltage LIBs.
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
POLYMER
·
2018
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IF 3.483
Hao Xu,Ailian Wang,Xu Liu,Di Feng,Shi Wang,Jie Chen,Yan An,Liaoyun Zhang
The trade-off between ionic conductivity and mechanical strength is still a great challenge for all-solid-state polymer electrolyte . Herein, a novel structure-controlled fluorine-containing star-branched polymer (HBPS-(PTFEMA- b -PPEGMA) 27 ) with a hyperbranched polystyrene core and polytrifluoroethyl methacrylate-block-poly (ethylene glycol) methyl ether methacrylate arms is synthesized by atom transfer radical polymerization . Combining the good mechanical strength of fluorine-containing segments and flexible property of PEG segments, the prepared HBPS-(PTFEMA- b -PPEGMA) 27 /LiTFSI solid polymer electrolyte can form flexible transparent self-standing membrane and exhibits the high ionic conductivity of 2.4 × 10 −5 S cm -1 at 25 °C, as well as good thermal stability with the thermal decomposition temperature of 374.7 °C. It also possesses a wide electrochemical window of 4.9 V and good interfacial compatibility. Moreover, the Li/LiFePO 4 cell based on this solid state star-branched polymer electrolyte membrane delivers a high discharge capacity of 147.2 mAh g −1 under a current density of 0.1C at 60 °C.
研究领域:
材料科学
·
电化学
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聚合物化学
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能源存储
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jingshun Wang,Yongquan Zhang,Zengxu Chen,Shuo Fan,Qihui Zhang,Yue Zhang,Tiandong Zhang,Changhai Zhang,Qingguo Chi
Polymer electrolytes have become widely popular on account of their low expenses, reduced weight, simple processing, and excellent safety features. However, polymer electrolytes have yet to find use in commercial batteries because of their limited mechanical durability and poor ionic conductivity . In this paper, an ultra-stable cycles and interfaces blending polymer electrolyte (BPE) suitable for all solid-state Li metal batteries was prepared by blending three polymers: polymethyl methacrylate (PMMA), polyvinylidene fluoride hexafluoropropylene (PVDF-HFP), and polyethylene oxide (PEO). Microstructure characterization showed numerous amorphous areas with strong interfacial strength of the BPE. The BPE3 exhibited a maximum of 15.65 MPa in tensile strength. BPE2 have excellent electrochemical performance, such as wide electrochemical windows (up to 4.7 V vs Li/Li + ), high lithium ion transference numbers (up to 0.75), high ion conductivity (up to 1.87 × 10 -4 S cm −1 at 60 °C), and excellent interface stability. By assembling all state-solid LiFePO 4 /BPE2/Li batteries for electrochemical testing, BPE2 exhibit high electrochemical characteristics. BPE2 discharge specific capacity is as high as 154.7 mAh g −1 at 1C. The BPE2 underwent 200 cycles at 0.5C and 400 cycles at 1C, with capacity retention rates of 95.7 % and 96.6 %, respectively. BPE is a promising electrolyte candidate for flexible lithium metal batteries.
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
危险品化学品经营许可证（带存储）