An ultra-stable lithium plating process enabled by the nanoscale interphase of a macromolecular additive

2020 ◽  
Vol 8 (45) ◽  
pp. 23844-23850
Author(s):  
Mengmin Jia ◽  
Yawei Guo ◽  
Haiyan Bian ◽  
Qipeng Zhang ◽  
Lan Zhang ◽  
...  
Keyword(s):  
High Temperature ◽  
Functional Groups ◽  
Lithium Salt ◽  
Physical Barrier ◽  
Electrolyte Additive

A nanostructured macromolecular lithium salt electrolyte additive is reported. It can serve as a flexible physical barrier between Li/electrolyte interphase and provide extra Li+. Some of its functional groups can absorb HF, reducing parasitic reactions at high temperature.

1-(2-Cyanoethyl)pyrrole enables excellent battery performance at high temperature via the synergistic effect of Lewis base and CN functional groups

2020 ◽  
Vol 56 (60) ◽  
pp. 8420-8423
Author(s):  
Kaijia Duan ◽  
Jingrong Ning ◽  
Lai Zhou ◽  
Wenjia Xu ◽  
Chuanqi Feng ◽  
...  
Keyword(s):  
High Temperature ◽  
Synergistic Effect ◽  
Lithium Ion Batteries ◽  
Functional Groups ◽  
High Performance ◽  
Lithium Ion ◽  
Lewis Base ◽  
Electrolyte Additive

1-(2-Cyanoethyl)pyrrole electrolyte additive via a capturing strategy enables high-performance of lithium-ion batteries at high temperature.

scholarly journals Influence of Biochar Composition and Micro-Structure on the Denitration of Flue Gases at High Temperature

2020 ◽  
Vol 10 (6) ◽  
pp. 1920
Author(s):  
Yali Wang ◽  
Nannan Qin ◽  
Suping Cui ◽  
Xiaoyu Ma ◽  
Siyu Peng
Keyword(s):  
High Temperature ◽  
Functional Groups ◽  
Rice Husk Ash ◽  
No Reduction ◽  
Fixed Bed ◽  
Flue Gases ◽  
Composition And Structure ◽  
O2 Concentration ◽  
Denitration Rate ◽  
Positive Effect

Biochar materials are good reducers of nitrogen oxides. The composition and structure of biochar affect significantly its ability to reduce C–NO. In order to study the denitration of flue gases by biochar at high temperature, three kinds of biochar (bamboo charcoal (BC), rice husk ash (RHA), and straw charcoal (SC)) were mixed with cement raw meal in a fixed-bed quartz reactor at the temperature of 800–900 °C and O2 concentration of 0.5%–2%. The results showed that the initial denitration rate of BC was higher than that of RHA, and that of SC was the lowest. RHA had the largest specific surface area, and BC the smallest. The elements C, N, and O and the functional groups of the three types of biochar had a greater influence on the denitration rate than their structures. The denitration rate decreased faster as the O/C ratio increased, and the increase in the relative content of the N element induced the formation of nitrogen-containing functional groups catalyzing C–NO reduction. The content of the C–C bond affected directly the rate of denitration, and both (NCO)x and C–O bonds had a positive effect on the reduction capability of biochar. It can be concluded that the composition of biochar has an important effect on the reduction of C–NO.

Modification of Activated Carbon and its Application on Adsorption of UDMH Gas

2013 ◽  
Vol 634-638 ◽  
pp. 1026-1030 ◽  
Author(s):  
Huan Chun Wang ◽  
Xiao Li Gou ◽  
Xiao Meng Lv
Keyword(s):  
Activated Carbon ◽  
High Temperature ◽  
Transition Metal ◽  
Surface Structure ◽  
Functional Groups ◽  
Room Temperature ◽  
Activated Carbons ◽  
Metal Solution ◽  
Modified Activated Carbons

Two kinds of modified activated carbons were prepared by dipping with Zn(NO3)2 solution and by reducing in the atmosphere of N2 at high temperature respectively, which were characterized by FTIR,DSC,SEM and EDS. The surface structure was strongly changed in the process, along with the changes of chemical functional groups. The results of adsorption experiments revealed that the adsorbent capacities of UDMH gas at room temperature were enhanced obviously by modification compared with the raw activated carbon, especially dipped by transition metal solution. The mechanism probably involved was also discussed.

Lithium-Ion Capacitors and Hybrid Lithium-Ion Capacitors—Evaluation of Electrolyte Additives Under High Temperature Stress

MRS Advances ◽  
2019 ◽  
Vol 4 (49) ◽  
pp. 2641-2649
Author(s):  
Jonathan Boltersdorf ◽  
Jin Yan ◽  
Samuel A. Delp ◽  
Ben Cao ◽  
Jianping P. Zheng ◽  
...  
Keyword(s):  
High Temperature ◽  
Lithium Iron Phosphate ◽  
Extreme Environments ◽  
Lithium Ion ◽  
High Temperature Stress ◽  
Design Factor ◽  
Electrolyte Additive ◽  
Electrolyte Additives ◽  
Additive Formulation ◽  
Composite Cathodes

ABSTRACTLithium-ion capacitors (LICs) and Hybrid LICs (H-LICs) were assembled as three-layered pouch cells in an asymmetric configuration employing Faradaic pre-lithiated hard carbon anodes and non-Faradaic ion adsorption-desorption activated carbon (AC) cathodes for LICs and lithium iron phosphate (LiFePO4-LFP)/AC composite cathodes for H-LICs. The room temperature rate performance was evaluated after the initial LIC and H-LIC cell formation as a function of the electrolyte additives. The capacity retention was measured after charging at high temperature conditions, while the design factor explored was electrolyte additive formulation, with a focus on their stability. The high temperature potential holds simulate electrochemical energy materials under extreme environments and act to accelerate the failure mechanisms associated with cell degradation to determine robust electrolyte/additive combinations.

scholarly journals Improved High-Temperature Performance and Surface Chemistry of Graphite/LiMn2O4 Li-Ion Cells by Fluorosilane-Based Electrolyte Additive

2015 ◽  
Vol 160 ◽  
pp. 347-356 ◽  
Author(s):  
Kiyofumi Yamagiwa ◽  
Daichi Morita ◽  
Naoaki Yabuuchi ◽  
Tatsuya Tanaka ◽  
Mika Fukunishi ◽  
...  
Keyword(s):  
High Temperature ◽  
Surface Chemistry ◽  
Electrolyte Additive ◽  
Temperature Performance ◽  
Li Ion

scholarly journals High Temperature Vacuum Annealing and Hydrogenation Modification of Exfoliated Graphite Nanoplatelets

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Xiaobing Li ◽  
Sanjib Biswas ◽  
Lawrence T. Drzal
Keyword(s):  
High Temperature ◽  
Functional Groups ◽  
Vacuum Annealing ◽  
Atmospheric Oxygen ◽  
Graphite Nanoplatelets ◽  
Highly Active ◽  
Oxygen Functional Groups ◽  
Defect Sites ◽  
Capacitance Characteristics ◽  
Oxygen Groups

Highly active defect sites on the edges of graphene automatically capture oxygen from air to form various oxygen groups. A two-step procedure to remove various oxygen functional groups from the defect sites of exfoliated graphene nanoplatelets (GNPs) has been developed to reduce the atomic oxygen concentration from 9.5% to 4.8%. This two-step approach involves high temperature vacuum annealing followed by hydrogenation to protect the reduced edge carbon atoms from recombining with the atmospheric oxygen. The reduced GNPs exhibit decreased surface resistance and graphitic potential-dependent capacitance characteristics compared to the complex potential-dependent capacitance characteristics exhibited by the unreduced GNPs as a result of the removal of the oxygen functional groups present primarily at the edges. These reduced GNPs also exhibit high electrochemical cyclic stability for electrochemical energy storage applications.

scholarly journals Improving the Stability of High-Voltage Lithium Cobalt Oxide with a Multifunctional Electrolyte Additive: Interfacial Analyses

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 609
Author(s):  
Xing-Qun Liao ◽  
Feng Li ◽  
Chang-Ming Zhang ◽  
Zhou-Lan Yin ◽  
Guo-Cong Liu ◽  
...  
Keyword(s):  
High Temperature ◽  
Cobalt Oxide ◽  
High Voltage ◽  
Electrode Materials ◽  
High Energy ◽  
High Energy Density ◽  
Side Reactions ◽  
Lithium Cobalt Oxide ◽  
Electrolyte Additive ◽  
Lithium Cobalt

In recent years, various attempts have been made to meet the increasing demand for high energy density of lithium-ion batteries (LIBs). The increase in voltage can improve the capacity and the voltage platform performance of the electrode materials. However, as the charging voltage increases, the stabilization of the interface between the cathode material and the electrolyte will decrease, causing side reactions on both sides during the charge–discharge cycling, which seriously affects the high-temperature storage and the cycle performance of LIBs. In this study, a sulfate additive, dihydro-1,3,2-dioxathiolo[1,3,2]dioxathiole 2,2,5,5-tetraoxide (DDDT), was used as an efficient multifunctional electrolyte additive for high-voltage lithium cobalt oxide (LiCoO2). Nanoscale protective layers were formed on the surfaces of both the cathode and the anode electrodes by the electrochemical redox reactions, which greatly decreased the side reactions and improved the voltage stability of the electrodes. By adding 2% (wt.%) DDDT into the electrolyte, LiCoO2 exhibited improved Li-storage performance at the relatively high temperature of 60 °C, controlled swelling behavior (less than 10% for 7 days), and excellent cycling performance (capacity retention rate of 76.4% at elevated temperature even after 150 cycles).

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