Polymer Chemistry
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2024
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IF 4.1
Haomin Wu,Wencan Ma,Xin Huang,Yifeng Cai,Junheng Li,Qiaobo Liao,Kai Xi,Qiuhong Zhang,Xudong Jia
Single-ion quasi-solid-state electrolytes (SIQSSEs) attract increasingly attention recently, due to their ability in suppressing the growth of lithium dendrite and offering higher safety. However, the low ionic conductivity is still the major bottleneck for preventing the practical application. Covalent organic frameworks (COFs) are considered as potential candidates for quasi-solid-state electrolytes (QSSEs) due to their high porosity and ordered structures. Herein, we demonstrate a series of crystalline covalent organic frameworks with sulfonimide groups as a new class of single-ion electrolytes. Owing to the directional lithium transport pathway and adequate binding site for lithium-ions, these COF-based electrolytes deliver good ionic conductivity (4.3×10-4 S cm-1) at 298 K, with high lithium transference number (LTN, ~0.90) and a low activation energy (0.24 eV). We also find both strong electron-withdrawing substituent and delocalized substituent could promote lithium-ion transportation. Furthermore, the Li||LiFePO4 (LFP) cells based on the sulfonimide-functionalized covalent organic framework (SF-COF) electrolytes deliver outstanding rate performance with long cycle life (99% capacity retention after 100 cycles at 0.2 C). Our work demonstrates that crystalline covalent organic frameworks show great potential for application as building blocks of solid electrolytes in lithium metal batteries.
研究领域:
材料科学
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电化学
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能量存储
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Yuanjun Zhao,Mengqiu Gao,Yanyang Qin,Xinyu Da,Xuetian Deng,Xin Jia,Kai Xi,Yaqiong Su,Shujiang Ding,Qiang Rong,Xiangpeng Kong,Guoxin Gao
Fabricating flexible composite polymer electrolytes (CPEs) with vertically aligned ion transport pathways is necessary for the application of solid-state lithium metal batteries (LMBs), yet the orientation of polymer matrix usually is disorder, thus the improvement in ionic conductivity is unsatisfied. Herein, we develop a simple electric field induced molecular orientation strategy to fabricate the flexible CPEs with vertically aligned ion transport pathways. Driven by direct current (DC) electric field (e.g. 1.5 MV m −1 ), the polar 15C5-Li + dipoles and monomer molecules are oriented regularly and cured to form flexible three dimension (3D) cross-linked structure. As a result, numerous vertically-aligned ion transport pathways have been generated in the vertically oriented arrangement CPEs, thus presenting highly enhanced ionic conductivities, mechanical strength and superb inhibition ability to lithium dendrite growth. When used as CPEs for Li||LiFePO 4 (LFP) batteries, the vertically oriented CPEs exhibit excellent rate and long-term cycle stability with a reversible discharge capability of 124.9 mAh g −1 after 350 cycles at 1C and 60 °C. However, the randomly oriented CPEs deliver much poor cycle and rate performance at the same conduction. It can also be compatible with NCM811|Li batteries at 30 °C. Therefore, our simple DC electric field induced molecular orientation strategy holds a great application promise to construct the fast ion transport channels for the all-solid-state LMBs.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
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2020
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IF 2.029
Wanwan Wang,Zhiqiang Fang,Ming Zhao,Yan Peng,Jiujun Zhang,Shiyou Guan
In this work, composite membranes consisting of triethylmethylammonium bis(fluorosulfonyl)imide (N 1222 FSI), poly(ethylene oxide) (PEO) and lithium bis(fluorosulfonyl) imide (LiFSI) have been produced as solid polymer electrolytes (SPEs). The composite SPEs provide good mechanical property, high ionic conductivity at 50 °C, high electrochemical and thermal stability as well as superior interfacial compatibility with lithium metal. Moreover, Li/LiFePO 4 cells containing the best-performing SPE exhibit high discharge capacity and excellent cycling performance. The results show that the novel composite SPEs might be promising electrolytes applied in all-solid-state lithium 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
产品关联
DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-10
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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
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电池技术
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DOI
高影响因子
POLYMER
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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
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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
危险品化学品经营许可证（带存储）