Superior rate-capability and long-lifespan carbon nanotube-in-nanotube@Sb₂S₃ anode for lithium-ion storage

Abstract

It is vital to improve rate capability and cycling performance of Sb2S3 to promote its application in lithium-ion batteries. Herein, Sb2S3 is successfully anchored inside carbon nanotube-in-nanotube via a multi-step...

NiSe2 Nanoparticles Decorated on Carbon Nanosheet Arrays as Anodes for Sodium Storage

“…Using a similar approach, the contribution ratios of the pseudocapacitive process can be calculated to be 60.9, 64.5, 73.9, 80.9, and 87.4% at 0.2, 0.4, 0.6, 0.8, and 1 mV s –1 , respectively, as summarized in Figure D, reflecting the rapid sodium ion insertion and extraction in the composite at high scan rates, which can facilitate the enhanced rate capability of the NiSe 2 /C-2G-500 electrode. It is well known that the GITT as a powerful technique can be further utilized to analyze the diffusion coefficients of ions in solid phases. , The corresponding GITT curves of the NiSe 2 and NiSe 2 /C-2G-500 electrodes are presented in Figure E, and the detailed diffusion coefficients of Na + ( D Na + ) for these two electrodes can be derived according to the following equation where M B and m B refer to the molecular mass and mass loading of the active materials, respectively, , V m represents the molar volume, and A stands for the surface area of the electrode. Δ E s is the steady-state voltage change caused by the current pulse, while Δ E t is the voltage change within the current pulse excluding the IR drop. , Figure F displays the calculated D Na + for the NiSe 2 and NiSe 2 /C-2G-500 electrodes under different sodiation and desodiation states.…”

“…It is well known that the GITT as a powerful technique can be further utilized to analyze the diffusion coefficients of ions in solid phases. 71,72 The corresponding GITT curves of the NiSe 2 and NiSe 2 /C-2G-500 electrodes are presented in Figure 6E, and the detailed diffusion coefficients of Na + (D Na + ) for these two electrodes can be derived according to the following equation…”

Fast Charge Transfer Kinetics Enabled by Carbon‐Coated, Heterostructured SnO2/SnSx Arrays for Robust, Flexible Lithium‐Ion Batteries

“…Lithium-ion batteries (LIBs), as the most significant electrochemical storage technology, have received extensive attention, thanks to the merits of high energy density and long-term cycle life. [1][2][3][4][5][6] Meanwhile, emerging flexible/bendable electronic devices may substantially change our daily lives, where flexible LIBs are indispensable. [4,[7][8][9] However, the traditional manufacturing processes of LIBs hinder their applications in flexible and wearable devices.…”

Facile Fabrication of Highly Porous 3D Sponge‐Like Si@C Composites as High‐Performance Anode Materials for Lithium‐Ion Batteries

“…In addition to the aforementioned advantages, Si presents inherent drawbacks, such as less electronic conductivity, low lithium‐ion diffusion, and large volume expansion issue (approximately 300 %) during alloying‐dealloying with Li. These shortcomings result in low rate capability and rapid capacity decay of Si anodes during discharge‐charge cycling [5–7] …”

“…These shortcomings result in low rate capability and rapid capacity decay of Si anodes during discharge-charge cycling. [5][6][7] So far, numerous approaches have been implemented to control the volume expansionÀ contraction of commercial LIBs featuring Si anodes and to enhance the electrochemical behavior of the silicon-based anodes in term of rate capability, high capacity, and long cyclability. Si nano-structuring into nanotubes, nanoparticles, nanorods, nanofilaments, nanosheets, and porous interconnected nanoparticles has been predicted to boost the Li + storage performance of Si based anode materials.…”