A Dynamic Structural Stabilization Strategy for Li-Doped Sodium-Ion Battery Cathodes.

Unfavorable phase transformations and limited practical capacity remain significant challenges to the widespread application of layered oxides in sodium-ion batteries. Lithium doping has emerged as an effective strategy to suppress phase transformations and activate oxygen redox reactions. However, solid-state NMR reveals that Li gradually deintercalates from the bulk of the cathode during repeated cycles, ultimately compromising the efficacy of Li-doping.

Stabilizing Interlayer Repulsion in Layered Sodium-Ion Oxide Cathodes via Hierarchical Layer Modification.

Layered sodium-ion oxides hold considerable promise in achieving high-performance sodium-ion batteries. However, the notorious phase transformation during charging, attributed to increased O─O repulsion, results in substantial performance decay. Here, a hierarchical layer modification strategy is proposed to stabilize interlayer repulsion.

Understanding the failure process of sulfide-based all-solid-state lithium batteries via operando nuclear magnetic resonance spectroscopy.

The performance of all-solid-state lithium metal batteries (SSLMBs) is affected by the presence of electrochemically inactive (i.e., electronically and/or ionically disconnected) lithium metal and solid electrolyte interphase (SEI), which are jointly termed inactive lithium.

Mitigating the Surface Reconstruction of Ni-Rich Cathode P2-Type Mn-Rich Oxide Coating for Durable Lithium Ion Batteries.

Ni-rich materials have received widespread attention as one of the mainstream cathodes in high-energy-density lithium-ion batteries for electric vehicles. However, Ni-rich cathodes suffer from severe surface reconstruction in a high delithiation state, constraining their rate capabilities and life span. Herein, a novel P2-type NaNiMnO (NNMO) is rationally selected as the surficial modification layer for LiNiCoMnO (NCM811) cathode, which undergoes a spontaneous Na-Li exchange reaction to form an O2-type LiNiMnO (LNMO) layer revealed by combining X-ray diffraction and solid-state nuclear magnetic resonance techniques.

Constructing a High-Energy and Durable Single-Crystal NCM811 Cathode for All-Solid-State Batteries by a Surface Engineering Strategy.

Single-crystal LiNiCoMnO (S-NCM811) with an electrochemomechanically compliant microstructure has attracted great attention in all-solid-state batteries (ASSBs) for its superior electrochemical performance compared to the polycrystalline counterpart. However, the undesired side reactions on the cathode/solid-state electrolyte (SSE) interface causes inferior capacity and rate capability than lithium-ion batteries, limiting the practical application of S-NCM811 in the ASSB technology. Herein, it shows that S-NCM811 delivers a high capacity (205 mAh g, 0.

High-Efficiency Lithium Metal Anode Enabled by a Concentrated/Fluorinated Ester Electrolyte.

Lithium (Li) metal anode (LMA) has received growing attention due to its highest theoretical capacity (3860 mA h g) and lowest redox potential (-3.04 V versus standard hydrogen electrode). However, practical application of LMA is obstructed by the detrimental side reactions between Li metal and organic electrolytes, especially when cycled in traditional carbonate ester electrolytes.

P2-Na Al Mn O : Cost-Effective, Stable and High-Rate Sodium Electrodes by Suppressing Phase Transitions and Enhancing Sodium Cation Mobility.

Sodium layered P2-stacking Na MnO materials have shown great promise for sodium-ion batteries. However, the undesired Jahn-Teller effect of the Mn /Mn redox couple and multiple biphasic structural transitions during charge/discharge of the materials lead to anisotropic structure expansion and rapid capacity decay. Herein, by introducing abundant Al into the transition-metal layers to decrease the number of Mn , we obtain the low cost pure P2-type Na Al Mn O (x=0.

Stable Cycling Lithium-Sulfur Solid Batteries with Enhanced Li/LiGePS Solid Electrolyte Interface Stability.

We herein explore a facile and straightforward approach to enhance the interface stability between the lithium superionic conducting LiGePS (LGPS) solid electrolyte and Li metal by employing ionic liquid such as 1 M lithium bis(trifluoromethanesulfonyl)imide (LiTFSI)/ N-methyl- N-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PYRTFSI) as the interface modifier. The results demonstrated the presence of 1 M LiTFSI/PYRTFSI ionic liquid; the interface stability at the electrode/solid electrolyte (i.e.

Identification of the Solid Electrolyte Interface on the Si/C Composite Anode with FEC as the Additive.

Silicon-based anodes have the potential to be used in next-generation lithium ion batteries owing to their higher lithium storage capacity. However, the large volume change during the charge/discharge process and the repeated formation of a new solid electrolyte interface (SEI) on the re-exposed Si surface should be overcome to achieve a better electrochemical performance. Fluoroethylene carbonate (FEC) has been widely used as an electrolyte additive for Si-based anodes, but the intrinsical mechanism in performance improvement is not clear yet.

Stabilizing LiSnPS/Li Interface via an in Situ Formed Solid Electrolyte Interphase Layer.

Despite the extremely high ionic conductivity, the commercialization of LiGePS-type materials is hindered by the poor stability against Li metal. Herein, to address that issue, a simple strategy is proposed and demonstrated for the first time, i.e.

Toward a stabilized lattice framework and surface structure of layered lithium-rich cathode materials with Ti modification.

Layered lithium-rich oxides have several serious shortcomings such as fast voltage fading and poor cyclic stability of energy density which greatly hinder their practical applications. Fabrication of a stable framework of layered lithium-rich oxides during charging-discharging is crucial for addressing the above problems. In this work, we show that Ti modification is a promising way to realize this target with bifunctional roles.