Hierarchical Carbon Nanosheet Assembly with SiO_x Incorporation and Nitrogen Doping Achieves Enhanced Lithium Ion Storage Performance

Abstract

Lithium ion batteries (LIBs) have dominated the markets of portable electronics due to the merits of a low self‐discharge rate, high voltage platform, environmental friendliness, and portability. However, the limited theoretical capacity of the current commercial anode material causes unsatisfied energy density of LIBs, which falls behind the ever‐increasing demands of society. Herein, a hierarchical porous carbon nanosheet assembly is successfully constructed with simultaneous SiOx incorporation and nitrogen doping (denoted as HPCNA‐(N, Si)) through a supramolecular assembly–based one‐pot strategy followed by a calcination process. Benefitting from the unique morphology, highly porous feature, and the synergy of SiOx incorporation and nitrogen doping, the HPCNA‐(N, Si) exhibits largely enhanced Li+ storage performance when evaluated as anode material for LIBs. Specifically, it can deliver a high specific capacity of 583.0 mA h g−1 at 500 mA g−1 with a stable cycling capability (700 cycles with an average attenuation rate of 0.32% at 1000 mA g−1). The possible origins of the promising Li+ storage behavior for HPCNA‐(N, Si) are unraveled based on the cyclic voltammetry (CV) curves, where a fair capacitive contribution of 63.6% at 0.9 mV s−1 could imply fast ion transfer kinetics for superior rate and cycling performance.

Printable and Free-Standing Silicon-Based Anode for Current Collector-Free Lithium-Ion Batteries

“…The values indicate the respective contributions of two charge storage mechanisms: (i) the diffusion-controlled reactions and (ii) the capacitive-controlled reactions (Figure b) . The b -value can be calculated using eq i = k 1 v + k 2 v 1 / 2 = a v b where k 1 , k 2 , and a are the constants, v represents the scan rate, and b is a value ranging from 0.5 to 1.0, suggesting the contributions of diffusion-controlled reaction and capacitive-controlled reaction.…”

Versatile Inorganic/Polymer Composite Electrolyte Added with 2-Methylsuccinic Anhydride via a Solvent-Free Preparation Method for High-Performance All-Solid-State Li-Metal Batteries: High Voltage, Long Cycle Life, and Room-Temperature Operation

“…Li-ion batteries (LIBs) have been successfully commercialized for decades in various fields, such as portable electronics, electric vehicles, as well as large-scale energy-storage systems . However, current LIBs, which use a liquid electrolyte (LE), suffer from safety issues owing to hazardous solvent leakage and fire risks, which can be addressed appropriately by replacing the conventional LE with a solid-state electrolyte (SSE). – The inherently high shear modulus of the SSEs can efficiently suppress Li dendrite growth, which is easily induced in LE-based Li-metal batteries (LMBs). , As a result, a lithium metal anode can be practically utilized in solid-state batteries to construct LMBs with high voltage and energy density characteristics owing to its lowest electrochemical potential of −3.04 V vs H/H + and an ultrahigh theoretical capacity of 3860 mA h g –1 . , …”

“…Li-ion batteries (LIBs) have been successfully commercialized for decades in various fields, such as portable electronics, electric vehicles, as well as large-scale energy-storage systems. 1 However, current LIBs, which use a liquid electrolyte (LE), suffer from safety issues owing to hazardous solvent leakage and fire risks, which can be addressed appropriately by replacing the conventional LE with a solid-state electrolyte (SSE). 2−4 The inherently high shear modulus of the SSEs can efficiently suppress Li dendrite growth, which is easily induced in LE-based Li-metal batteries (LMBs).…”