KTi (PO ) Electrode with a Long Cycling Stability for Potassium-Ion Batteries.

In this work, rhombohedral KTi (PO ) is introduced to investigate the related theoretical, structural, and electrochemical properties in K cells. The suggested KTi (PO ) modified by electro-conducting carbon brings about a flat voltage profile at ≈1.6 V, providing a large capacity of 126 mAh (g-phosphate) , corresponding to 98.

Nature-Derived Cellulose-Based Composite Separator for Sodium-Ion Batteries.

Sodium-ion batteries (SIBs) are emerging power sources for the replacement of lithium-ion batteries. Recent studies have focused on the development of electrodes and electrolytes, with thick glass fiber separators (~380 μm) generally adopted. In this work, we introduce a new thin (~50 μm) cellulose-polyacrylonitrile-alumina composite as a separator for SIBs.

Layered KMnO·0.15HO as a Cathode Material for Potassium-Ion Intercalation.

Here, we present KMnO·0.15HO, which has a two-dimensional open framework, as an intercalation host for potassium ions. KMnO·0.

The Conversion Chemistry for High-Energy Cathodes of Rechargeable Sodium Batteries.

Herein, the CuPO/carbon-nanotube nanocomposite is reported as a cathode material based on a conversion reaction for rechargeable sodium batteries (RSBs). The nanocomposite electrode exhibits the large capacity of 355 mAh g, which is consistent with the 4 mol Na storage per formula unit determined by first-principles calculation. Its average operation voltage is approximately 2.

Cycling Stability of Layered Potassium Manganese Oxide in Nonaqueous Potassium Cells.

Potassium-ion batteries have emerged as an alternative to lithium-ion batteries as energy storage systems. In particular, KMnO has attracted considerable attention as a cathode material because of its high theoretical capacity and low cost. In this study, partial substitution of Mn in P3-type KMnO with divalent Ni is performed, resulting in a first discharge capacity of approximately 121 mAh (g-oxide) with 82% retention for 100 cycles.

New Insight into Ethylenediaminetetraacetic Acid Tetrasodium Salt as a Sacrificing Sodium Ion Source for Sodium-Deficient Cathode Materials for Full Cells.

Sacrificing sodium supply sources is needed for sodium-deficient cathode materials to achieve commercialization of sodium-ion full cells using sodium-ion intercalation anode materials. Herein, the potential of ethylenediaminetetraacetic acid tetrasodium salt (EDTA-4Na) as a sacrificing sodium supply source was investigated by intimately blending it with sodium-deficient P2-type Na[AlMn]O. The EDTA-4Na/Na[AlMn]O composite electrode unexpectedly exhibited an improved charge capacity of 177 mA h (g-oxide) compared with the low charge capacity of 83 mA h (g-oxide) for bare Na[AlMn]O.

Unraveling the Role of Earth-Abundant Fe in the Suppression of Jahn-Teller Distortion of P'2-Type NaMnO: Experimental and Theoretical Studies.

Layered NaMnO suffers from capacity loss due to Jahn-Teller (J-T) distortion by Mn ions. Herein, density functional theory calculations suggest Na[Fe Mn]O suppresses the J-T effect. The Fe substitution results in a decreased oxygen-metal-oxygen length, leading to decreases in the b and c lattice parameters but an increase in the a lattice constant.

Synthesis and Electrochemical Reaction of Tin Oxalate-Reduced Graphene Oxide Composite Anode for Rechargeable Lithium Batteries.

Unlike for SnO, few studies have reported on the use of SnCO as an anode material for rechargeable lithium batteries. Here, we first introduce a SnCO-reduced graphene oxide composite produced via hydrothermal reactions followed by a layer-by-layer self-assembly process. The addition of rGO increased the electric conductivity up to ∼10 S cm.