One-Step Synthesis of ZnNCN Nanoparticles with Adjustable Composition for an Advanced Anode in Lithium Ion Battery

Abstract

Designing an anode with a low-cost and simple preparation method is the key to developing the lithium ion battery. Here, ZnNCN nanoparticles are synthesized by one-step calcination of the mixture of melamine and zinc nitrate. By adjusting the reaction temperature, the pure ZnNCN with good crystalline character is obtained. The conversion-type mechanism of ZnNCN is proved by ex situ X-ray diffraction and electrochemical curves. More importantly, ZnNCN exhibits a high discharging capacity (405 mAh g −1 at 0.1 A g −1 ), an excellent rate property (140 mAh g −1 at 3 A g −1 ), and a long cyclic life (capacity fading per cycle of 0.025% during 700 cycles at 1.0 A g −1 ). Also, this work provides a new approach to prepare metal carbodiimides.

Bamboo-like Carbon Nanotubes with the Theoretical Upper-Limit N-Doping Concentration for Advanced Nonradical Oxidation

“…Also, as presented in the FT-IR spectra (Figure c), the vibration peaks of (NCN) 2 – located at 2046 and 671 cm –1 could be found in the FT-IR spectra of ZnNCN-5, P-700, and P-900 . With the increase of temperature, the vibration peaks of ZnNCN decreased and the characteristic vibration peak of Zn­(CN) 2 merged at 2216 cm –1 in the FT-IR spectrum of P-900 . This also confirmed the formation of Zn­(CN) 2 intermediates during the formation of BCNT-5.…”

“…20 With the increase of temperature, the vibration peaks of ZnNCN decreased and the characteristic vibration peak of Zn(CN) 2 merged at 2216 cm −1 in the FT-IR spectrum of P-900. 21 This also confirmed the formation of Zn(CN) 2 intermediates during the formation of BCNT-5. When the temperature was increased to 1000 °C, ZnNCN-5 was transformed into carbonaceous materials as only C�C and C−N peaks were observed.…”

“…When the temperature was increased to 1000 °C, ZnNCN-5 was transformed into carbonaceous materials as only CC and C–N peaks were observed. Moreover, in the Raman spectra, the characteristic peaks of ZnNCN-5 and P-700 at 120, 171, 210, 1289, and 1407 cm –1 were assigned to ZnNCN (Figure d) . However, two peaks located at 1347 (D band) and 1576 cm –1 (G band) were observed in P-900 and P-1000, which demonstrated the formation of carbonaceous materials .…”

“…Moreover, in the Raman spectra, the characteristic peaks of ZnNCN-5 and P-700 at 120, 171, 210, 1289, and 1407 cm −1 were assigned to ZnNCN (Figure 2d). 21 However, two peaks located at 1347 (D band) and 1576 cm −1 (G band) were observed in P-900 and P-1000, which demonstrated the formation of carbonaceous materials. 22 From the above results, it was confirmed that the formation of BCNT-5 experienced a three-stage process, in which Zn(CN) 2 was formed as the intermediate.…”

In Situ K Doped γ-LiV2O5 as Long-Life Anode and Cathode for Lithium Ion Battery

“…Then, resistances remain stable in subsequent cycles, demonstrating the good cyclic stability of K-LVO (Figure a and Table S1). In the first through the third cyclic voltammetry (CV) curves, there are three main oxidation and reduction peaks (Figure b). Redox peaks at 3.63/3.47 and 3.76/3.38 V are related to the Li + insertion/deinsertion reaction in the octahedral site, while peaks at 2.64/2.24 V match with lithiation and delithiation in the tetrahedral site. ,, The first through the third charge–discharge curves are displayed in Figure c.…”