Promising ZnMn2O4 anode provides high capacity in Li-ion batteries and the capacity increase during cycling due to the reversible Li storage in SEI and the extra redox reaction of Mn(ii)/Mn(iii).

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The Li+ storage mechanism in a carbon composited zinc sulfide as an enhanced conversion-alloying anode material for Li+ ion batteries is studied by in situ methods. Further, it is found that the (de)lithiation processes are affected by a low charge transfer resistance, and the coated carbon can effectively improve the long-term cycling stability.

The chicken feather-derived N-doped porous carbons exhibit excellent electrochemical performance and high CO2 uptake.

In this work, a core-shell structure Fe2O3@C hollow nanospheres derived from metal-organic frameworks is used as anode material for Liion batteries. This material delivers reversible capacity of 928 mAh g-1 at 0.2 A g-1 in 1 M LiPF6 in ethylene carbonate: dimethyl carbonate=1:1. While1 M Lithium bis (trifluoromethane sulfonyl) imide is used as conductive salt, it delivers only 644 mAh g-1 at 0.2 A g-1. In operando synchrotron radiation diffraction revealed that the intermediate phases LixFe2O3 (R3 ̅ m, hexagonal) and LixFe2O3 (Fd3 ̅ m, Li-lean) form and subsequently convert to LixFe2O3 (Fd3 ̅ m, Li-rich), which finally transforms into Fe, Li2O, and LixFe2O3 (Fd3 ̅ m, X phase). During the de-lithiation process, the material does not return to the initial Fe2O3 structure. Instead, the partially de-lithiated Lix-1Fe2O3 (Fd3 ̅ m, X phase) and an amorphous metallic Fe phase remain. The Fe K-edge transition and the formation of Fe are confirmed by the in operando X-ray absorption spectroscopy measurement. Furthermore, the resistive contributions of this material in the two type of Li-salt are evaluated by electrochemical impedance spectroscopy, which highlight a different type of solid electrolyte interphase induced by the salt. This work provides fundamental insights on understanding the lithium-ion storage mechanism in conversion-type electrodes.

A sustainable nitrogen- and oxygen-doped carbon sheet was prepared from pigskin for supercapacitors with high capacitance and excellent rate capability.

The interest in exploring intercalation ions-based energy storage systems, which can be alternatives to the well-established Li + -based systems, is exponentially growing in the scientific community. This shift involves pure battery and hybrid battery-capacitor systems, which contains, at the same time, faradaic-type and double layer-type materials. In order to assess the feasibility of such hybrid system, the single materials have to be firstly analyzed independently. In this work, a commercial activated carbon is taken as an example of double layer-type material and is electrochemically investigated in several organic electrolytes with salts composed of various cations (Li + , Na + and K + ) and anions (PF 6 − , TFSI − and FSI − ). The adsorption of these cations/anions on the activated carbon and their kinetic properties are studied by means of cyclic voltammetry, galvanostatic cycling and electrochemical impedance spectroscopy. Finally, the effect of the different cations on ageing mechanism of symmetric capacitors is studied. The results reveal that the ageing mechanism induced by the Li-salts is different from those achieved with analogue salts containing Na and K cations.

Replacing liquid electrolytes with solid ones can provide advantages in safety, and all‐solid‐state batteries with solid electrolytes are proposed to solve the issue of the formation of lithium dendrites. In this study, a crosslinked polymer composite solid electrolyte was presented, which enabled the construction of lithium batteries with outstanding electrochemical behavior over long‐term cycling. The crosslinked polymeric host was synthesized through polymerization of the terminal amines of O,O‐bis(2‐aminopropyl) polypropylene glycol‐block‐polyethylene glycol‐block‐polypropylene glycol and terminal epoxy groups of bisphenol A diglycidyl ether at 90 °C and provided an amorphous matrix for Li+ dissolution. This composite solid electrolyte containing Li+ salt and garnet filler exhibited high flexibility, which supported the formation of favorable interfaces with the active materials, and possessed enough mechanical strength to suppress the penetration of lithium dendrites. Ionic conductivities higher than 5.0×10−4 S cm−1 above 45 °C were obtained as well as a wide electrochemical stability window (>4.51 V vs. Li/Li+) and a high Li+ diffusion coefficient (≈16.6×10−13 m2 s−1). High cycling stability (>500 cycles or 1000 h) was demonstrated.