553-91-3Relevant articles and documents
REDUCTION OF CARBON DIOXIDE TO OXALATE BY LITHIUM ATOMS: A MATRIX ISOLATION STUDY OF THE INTERMEDIATE STEPS
Manceron, L.,Loutellier, A.,Perchard, J. P.
, p. 115 - 124 (1985)
The codeposition of lithium atoms and carbon dioxide molecules in a krypton matrix at 9 K produces infrared absorptions attributable to five different species.Concentration effects, photosensitivity, annealing and isotopic substitutions provide information on the structure of each of these complexes, which have 1/1, 1/2 and 2/2 Li/CO2 stoichiometry.The two major reaction products have been identified as two isomers of LiCO2.In each case, vibrational data are consistent with a bent structure of the CO2 groups, indicating that, by analogy with the structure of CO2- anion in the gas phase, these complexes are stabilized by a strong transfer of the lithium valence electron to the CO2 group.Addition of another CO2 molecule produces two other intermediate steps to further reduction of carbon dioxide, achieved in the final high-stoichiometry product identified as lithium oxalate, Li2C2O4.
A nanorod-like Ni-rich layered cathode with enhanced Li+diffusion pathways for high-performance lithium-ion batteries
Li, Fangkun,Liu, Zhengbo,Shen, Jiadong,Xu, Xijun,Zeng, Liyan,Zhang, Binghao,Zhu, He,Liu, Qi,Liu, Jun,Zhu, Min
, p. 2830 - 2839 (2021)
Ni-rich LiNixCoyMn1?x?yO2(x≥ 0.6) layered oxide cathodes are among the most promising cathode materials for lithium-ion batteries (LIBs) owing to their superior capacity, prominent energy density and low cost. However, the large volume change caused by phase transition and poor diffusion kinetics limits their application. Herein, a nanorod-like Ni-rich layered LiNi0.6Co0.2Mn0.2O2cathode is synthesizedviaa facile surfactant-free co-precipitation route. Due to the unique nanorod morphology, more {010} electrochemically active planes are exposed. As a result, structural stability and diffusion kinetics are greatly improved. In terms of performance, it exhibits outstanding structural stability (the volume change is as small as 2.12% in the processes of charging and discharging) and rate performance (achieving a high discharge capacity of 152.2 mA h g?1at 5C). Such rationally designed cathode could meet the high high-energy requirements of next generation LIBs.
Preparation of LiBOB via rheological phase method and its application to mitigate voltage fade of Li1.16[Mn0.75Ni0.25]0.84O2 cathode
Lian, Fang,Li, Yang,He, Yi,Guan, Hongyan,Yan, Kun,Qiu, Weihua,Chou, Kuo-Chih,Axmann, Peter,Wohlfahrt-Mehrens, Margret
, p. 86763 - 86770 (2015/11/03)
Lithium bis(oxalato)borate (LiBOB) was synthesized via a novel rheological phase reaction method without any recrystallization procedure. The purity of the as-obtained LiBOB has been identified in comparison with the commercial sample and our sample prepared from solid-state reaction method. The results of XRD, ICP, and 11B NMR demonstrate that high pure LiBOB has been synthesized via rheological phase reaction method with significantly simplified synthetic process. Moreover, LiBOB sample has been investigated as electrolyte additive to improve the electrochemical performances of high-energy lithium-rich layered oxide. The cycling performances imply that 0.03 M and 0.05 M LiBOB additive can mitigate discharge voltage fade and enhance the cycle stability of Li1.16[Mn0.75Ni0.25]0.84O2 material. The CV, EIS and XPS data indicate that LiBOB oxidizes at ～4.3 V (vs. Li/Li+) on the cathode surface during the first charge to form a specific SEI layer with larger amount of organic species and fairly less content of LiF, which decreases the interfacial polarization and protects the active material from surface degradation, thereby mitigates the voltage-fade of Li-rich cathode.
