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A polymeric composite protective layer for stable Li metal anodes
Guo Suogang,Wang Li,Jin Yuhong,Piao Nan,Chen Zonghai,Tian Guangyu,Li Jiangang,Zhao Chenchen,He Xiangming 나노기술연구협의회 2020 Nano Convergence Vol.7 No.21
Lithium (Li) metal is a promising anode for high-performance secondary lithium batteries with high energy density due to its highest theoretical specific capacity and lowest electrochemical potential among anode materials. However, the dendritic growth and detrimental reactions with electrolyte during Li plating raise safety concerns and lead to premature failure. Herein, we report that a homogeneous nanocomposite protective layer, prepared by uniformly dispersing AlPO 4 nanoparticles into the vinylidene fluoride-co-hexafluoropropylene matrix, can effectively prevent dendrite growth and lead to superior cycling performance due to synergistic influence of homogeneous Li plating and electronic insulation of polymeric layer. The results reveal that the protected Li anode is able to sustain repeated Li plating/stripping for > 750 cycles under a high current density of 3 mA cm −2 and a renders a practical specific capacity of 2 mAh cm −2 . Moreover, full-cell Li-ion battery is constructed by using LiFePO 4 and protected Li as a cathode and anode, respectively, rendering a stable capacity after 400 charge/discharge cycles. The current work presents a promising approach to stabilize Li metal anodes for next-generation Li secondary batteries.
Chenchen Li,Dongmei Lu,Chao Wua 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.98 No.-
Most studies on SO2 capture using ionic liquids (ILs) have been carried out under mild conditions (e.g.,about 1 bar of SO2 and 20–40 C). However, these ILs only exhibit a fraction of their original SO2 uptakeunder harsher conditions, i.e., much lower SO2 partial pressure and evidently higher temperature (e.g.,0.2 mbar of SO2 and110 C). In this work, we screen 127 reported ILs for multi-molar SO2 absorptionunder the harsher conditions, covering nearly all the chemical space explored of the SO2 capturing IL. Aunique cooperative anion-SO2 interaction mode with two forms (the insertion adduct and the ringedadduct) has been identified for branched anions, where SO2 acts as both acid and base to attack differentreactive sites on anions. The simulated Langmuir isotherms further help screen out potential sorbents(amino-based branched singly charged anions with an Al atom as the center and carboxyl-based divalentanions) with both high overall capacity and high per-cycle absorption capacity. The energies of thereacting orbitals of the anions are linearly correlated to their SO2 binding energies. This work providesnew insights for the design of task-specific ILs under harsh conditions.
Xu Li,Si Li,Ying Liu,Chenchen Ma,Haoxiong He 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.5
Multi-hop Ad-hoc networks is an important organization way for Internet of Things. Through the simulation and analysis in high data load conditions, it can be seen that packet loss is not mainly caused by the change of data links,but the data collisions in MAC layer. What's more, the data collisions affect the routing constructions in NET layer. Therefore, packet loss is not only related to the routing algorithm, but also closely connected with point-to-point transmission performance in MAC layer. So we proposed a cross-layer scheme between the MAC layer and the NET layer. Through the simulation and analysis, it can be proved that this scheme improves the packet delivery, decreases the end-to-end delay and reduces the routing cost, applies to low speed mobile net-works and high data load scene.
Chenchen Wang,Zhitong Li,Hongliang Xin 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.1
The neutral-point (NP) voltage of three-phase three-level NP-clamped converters is needed for balance. To maintain NPpotential and suppress ripple, a novel NP voltage balancing strategy is proposed in this work. The mechanism of NP voltagevariation is studied first. Then, the relationship between the disassembly of zero level (O level) and NP current is studiedcomprehensively. On these bases, two methods for selecting one of three output phases for the disassembly of its O level arepresented. Finally, simulation and experimental results verify the validity and practicability of the proposed algorithms.
Wang, Chenchen,Li, Zhitong,Xin, Hongliang The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.1
The neutral-point (NP) voltage of three-phase three-level NP-clamped converters is needed for balance. To maintain NP potential and suppress ripple, a novel NP voltage balancing strategy is proposed in this work. The mechanism of NP voltage variation is studied first. Then, the relationship between the disassembly of zero level (O level) and NP current is studied comprehensively. On these bases, two methods for selecting one of three output phases for the disassembly of its O level are presented. Finally, simulation and experimental results verify the validity and practicability of the proposed algorithms.
Shuguo Qu,Chenchen Zhang,Minhui Li,Yan Zhang,Lunbo Chen,Yushuai Yang,Bo Kang,Yiwei Wang,Jihai Duan,Weiwen Wang 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.12
Making inexpensive proton exchange membrane with high proton conductivity for the proton exchange membrane fuel cell (PEMFC) is still a challenging problem. Graphene oxide (GO) nanoparticles grafted with (3-aminopropyl) triethoxy silane (APTES) were prepared and then incorporated into sulfonated poly(ether ether ketone) (SPEEK) matrix by solution casting to make the composite proton exchange membrane. The obtained nanoparticles and composite membranes were characterized by XRD, FT-IR, Raman, TGA, SEM, and UTM. GO treated with the silane coupling agent improved the dispersion stability and compatibility of GO in SPEEK, which decreased the agglomeration of GO nanoparticles in the SPEEK membrane. The prepared nanocomposite membranes exhibited better water retention properties and proton conductivity. The proton conductivity of the SPEEK membrane with 2wt% amine functionalized GO (AGO) reached 11.32mS/cm at 120oC, which was 2.45-times higher than that of the pristine SPEEK membrane. The reason was that AGO nanoparticles disperse uniformly in the SPEEK membranes, which provides new channels for proton transfer. The potential application of this composite membrane in the PEMFC was indicated.
Yongqiang Ma,Chenchen Li,Weiye Xiu,Xin Wang 한국식품과학회 2023 Food Science and Biotechnology Vol.32 No.6
This study evaluates the stability of lycopene in the presence of the prepared nanostructured lipid carriers (NLCs) under different environments and food systems and the in vitro and in vivo antioxidant activity of the lycopene nanostructured lipid carriers (Lyco-NLCs) was studied. As observed in the stability experiment, Lyco-NLCs have good storage stability within 30 days. Food additives have little effect on its stability except for metal ions. Compared with free lycopene, Lyco-NLCs showed an improved antioxidant property. In in-vitro experiments, the DPPH radical scavenging rate, hydroxyl radical scavenging capacity, and ferric reducing capacity of Lyco-NLCs increased by 90.47%, 47.43%, and 45.12%, respectively. The animal experiments showed that the activities of catalase in the kidney, superoxide dismutase in the heart, and glutathione peroxidase in the liver increased by 31.48%, 42.50%, and 21.47%, respectively. The content of malondialdehyde in serum decreased by 14.13%. The results have some significance for the practical application of lycopene.