Journal of Energy Storage
·
2024
·
IF 8.9
Xiaohuan Meng,Haiping Liu,Liuyan Ji,Wenxiu Gao,Sifu Bi,Shanshan Fan,Chen Yang,Lixin Cao
As one of the main components of the cathode and electrolyte for Li thermal batteries (LTBs), conventional binders typically employ high thermal stability MgO to maintain LTBs structure stability, but MgO has the disadvantage of high resistance, which can result in a high resistance at the cathode-electrolyte interface. Thus, it is crucial to optimize the cathode-electrolyte interface for NiS 2 to achieve high performance LTBs. Herein, Li 7 La 3 Zr 2 O 12 (LLZO) with high thermal stability and excellent ionic conductivity was adopted in the cathode and electrolyte to replace the conventional binders, aiming to build a low resistance interface between the cathode and electrolyte, promoting the Li + transport kinetics. More importantly, LLZO also plays a vital role in reducing molten salt leakage and enhancing the stability of the cathode-electrolyte interface in LTBs, which contributed to increasing the discharge capacity of the NiS 2 cathode material. Consequently, LTB containing LLZO delivers a high discharge specific capacity of 635.1 mAh g −1 with a cut off voltage of 1.4 V at 100 mA cm −2 at 500 °C, retaining 72.8 % of the theoretical capacity of NiS 2 , which is 25.5 % higher than LTB with MgO. These findings indicate that optimizing the NiS 2 electrode and LLZO electrolyte interface would be an effective way to enhance the performance of LTBs.
研究领域:
材料科学
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电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Xuhui Wang,Xufeng Dong,Xinyi Song,Fangyuan Hu,Hao Huang,Min Qi
All solid-state battery (ASSB) as the breakthrough of the advanced lithium-ions battery owing to its superior energy density and safety. Solid electrolytes are required to possess excellent electrochemical and safety. However, the low ionic conductivity and the poor interfacial compatibility, respectively, limits the progress of polymer and ceramic electrolyte , which accelerate the development of composite solid electrolyte (CSE). Therefore, we demonstrate a hierarchy structure that PEO(polyethylene)-LLZO@NFPAN-SiO 2 , which consists of SiO 2 particles encapsulated nanofibers (in-situ hydrolyzed by TEOS) and flexible membrane of PEO-LLZO to synergistically elevate the performance of CSE. This CSE exhibits broad electrochemical window (6 V vs. Li) and strong ionic conductivity (3.3 × 10 −4 S cm −1 , 30 °C), and also shows robust strength (5.1 MPa). The assembled Li-symmetric cells exhibit superior cycling life of 1000 h, with an extremely modest over potential of 45 mV. The full cell exhibits excellent cycle stability, 102 mA h g −1 after 100 cycles at 0.5C, and a high initial Coulomb efficiency of 68 %. Skeleton-flesh structure is constructed by in-situ particle-embedded nanofiber and covered polymer, which strengthened mechanical capability, compatibility, inhibition of lithium dendrites , and introduced multi-Li + transport pathways, ensuring high safety and superior electrochemical performance for the applications of ASSBs.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Liyuan Li,Tao Li,Yifan Sha,Chi Zhang,Baozeng Ren,Lan Zhang,Suojiang Zhang
Silicon-based anode materials attract ever-increasing attention owing to their high theoretical capacity. However, their practical application is significantly hindered by the dramatic volume change during the charge/discharge process, during which not only the solid electrolyte interface (SEI) but also the electrode might be ruined. Here, we propose a H-bond network-regulated binder by introducing low-molecular-weight cross-linkers, lithium oxalate and α-cyclodextrin (α-CD), into alginate (Alg). The balance between the binding strength and Li ion diffusion is realized through the control of the ratio between them. Lithium oxalate and α-CD can effectively regulate the H-bond network of the binder by forming intermolecular dynamic H bonds with Alg and reducing the intramolecular ones. Although the hybrid binder shows lower adhesion force than Alg, better electrode integrity is obtained during the charge/discharge process. Meanwhile, Li+ transportation is facilitated due to extra Li+ supplied by lithium oxalate, thereby achieving better rate capability.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
MOLECULES
·
2023
·Vol. 29
·期 1
·234
·
IF 4.6
Fei Tang,Wei Jiang,Jingjing Xie,Deyang Zhao,Yanfeng Meng,Zhenglong Yang,Zhiqiang Lv,Yanbin Xu,Wenjuan Sun,Ziqiao Jiang
Heterostructured materials show great potential to enhance the specific capacity, rate performance and cycling lifespan of lithium-ion batteries owing to their unique interfaces, robust architectures, and synergistic effects. Herein, a polypyrrole (PPy)-coated nanotube-like Mo3S4/CoMo2S4heterostructure is prepared by the hydrothermal and subsequent in situ polymerization methods. The well-designed nanotube-like structure is beneficial to relieve the serious volume changes and facilitate the infiltration of electrolytes during the charge/discharge process. The Mo3S4/CoMo2S4heterostructure could effectively enhance the electrical conductivity and Li+transport kinetics owing to the refined energy band structure and the internal electric field at the heterostructure interface. Moreover, the conductive PPy-coated layer could inhibit the obvious volume expansion like a firm armor and further avoid the pulverization of the active material and aggregation of generated products. Benefiting from the synergistic effects of the well-designed heterostructure and PPy-coated nanotube-like architecture, the prepared Mo3S4/CoMo2S4heterostructure delivers high reversible capacity (1251.3 mAh g−1at 300 mA g−1), superior rate performance (340.3 mAh g−1at 5.0 A g−1) and excellent cycling lifespan (744.1 mAh g−1after 600 cycles at a current density of 2.0 A g−1). Such a design concept provides a promising strategy towards heterostructure materials to enhance their lithium storage performances and boost their practical applications.
研究领域:
材料科学
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能量存储
·
纳米技术
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
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2020
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IF 3.557
Yefeng Feng,Kaidan Wu,Xiaoqian Deng,Jin Ke,BingWen Yang,Huafeng Dong,Deping Xiong,Miao He
The SnO2/Li4Ti5O12/C compound was gained via hydrothermal, sintering, and ball milling methods. Nano-grained SnO2/Li4Ti5O12 are homogeneously wrapped in a sheet-like graphite. Li4Ti5O12 possesses cyclic stability and superior rate capacity. Meanwhile, the SnO2/Li4Ti5O12 hybrid can supply abundant active sites for absorption of Li+, mitigate chemical stress in cycling, and prevent the ultrathin graphite nanosheets from stacking. Besides, the sheet-like graphite could reduce volume variation in cycling and reduce transmission distance for the electron or Li+. Therefore, an outstanding electrochemical property of the SnO2/Li4Ti5O12/C composite can be obtained.
研究领域:
材料科学
·
电化学
·
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）