Noble-metal-free bifunctional cathode catalysts, which can promote both the oxygen reduction reaction (ORR) and evolution (OER), are quite necessary for lithium–air batteries. In this study, we propose a novel strategy to improve catalytic performance of CoO through integration with dotted carbon species vacancies. We have successfully prepared carbon-dotted defective vacancies (CoO/C) by sintering pink precursors obtained from ethanol-mediated Co(Ac)2·4H2O. comparison commercial or...

High-voltage LiCoO2 delivers a high capacity but sharp fading is critical issue, and the decay mechanism also poorly understood. Herein, we clarify that escape of surface oxygen Li-insulator Co3 O4 formation are main causes for 4.6 V . We propose inhibition achieving stable by tailoring Co3d O2p band center enlarging their gap with MgF2 doping. This enhances ionicity Co-O bond redox activity Co improves cation migration reversibility. The suppresses maintains structure integrity. Mg acts as...

Oxygen release and irreversible cation migration are the main causes of voltage fade in Li-rich transition metal oxide cathode. But their correlation is not very clear decay still a bottleneck. Herein, we modulate oxygen anionic redox chemistry by constructing Li

Sulfide electrolytes with high ionic conductivity hold great promise for all-solid-state lithium batteries. However, the parasitic redox reactions between sulfide electrolyte and Li metal result in interfacial instability rapid decline of battery performance. Herein, a redox-resistible Li6 PS5 Cl (LPSC) is created by regulating electron distribution LPSC Mg F incorporation. The introduction triggers agglomeration around S atom, inhibiting acceptance from Li, generates self-limiting...

In this work, the catalytic efficiency of ionic liquid (IL) choline chloride/urea supported on molecular sieves for reactions CO2 and epoxides was studied under different conditions. It demonstrated that biodegradable green catalyst is very active selective, chloride urea showed a synergetic effect in promoting these reactions. After reaction, solid products could be separated easily because IL insoluble products, reusable. The origin high reaction mechanism were also discussed.

Co substitution has been extensively used to improve the electrochemical performances of cathode materials for sodium-ion batteries (SIBs), but role not well understood. Herein, we have comprehensively investigated effects Ni on structure and Na0.7Mn0.7Ni0.3-xCoxO2 (x = 0, 0.1, 0.3) as SIBs. In comparison with Co-free sample, high-rate capability cycle performance greatly improved by Co, some new insights into proposed first time. With Co(3+) Ni(2+) lattice parameter a decreases; however, c...

Li-rich Mn-based oxides (LRMO) are promising cathode materials to build next-generation lithium-ion batteries with high energy density exceeding 400 W h kg-1 . However, due a lack of in-depth understanding oxygen redox chemistry in LRMO, voltage decay is not resolved thoroughly. Here, it demonstrated that the could be tuned by modulating cation arrangement. It declares Li/Ni disorder and Li vacancies can inhibit formation OO dimers. Because chemical activity, dimers accelerate lattice...

We propose new insights into designing high-rate performance cathode materials for sodium-ion batteries through enlarging the interplanar spacing.

Li 3 VO 4 is a potential anode for Li‐ion batteries owing to its safe discharge plateau and high capacity, but the reported reversible capacity still far from theoretical value (592 mAh g −1 ). Here, first time, with approaching value. aggregates hybridized carbon (Li /C) are fabricated, then dramatically transform into well dispersed nanocrystals (NCs) anchoring on nanoflakes (NFs) by electrochemical reconstruction. In /C NC‐on‐NF structures, small‐sized NCs, flexible NFs, good dispersity...

Ni-rich layered cathodes have attracted great interest due to the high specific capacity, but they suffer from structure deterioration and resultant poor cyclability inferior storage performance. Herein, we propose a novel facile strategy in situ generate an integrated hierarchical spinel layer on surface of LiNi0.8Co0.1Mn0.1O2 (SC-LNCMO) through pH modulation induced gradient change Mn ions valence precursor. The self-forming this is tightly into phase by atom-scale interfacial junctions,...

A novel synchronous lithiation route has been successfully used to coat Li+-conductive Li2ZrO3 on the surface of LiNi1/3Co1/3Mn1/3O2 (Li2ZrO3@LNCMO). In this strategy, layer and host simultaneously form from ZrO2@Ni1/3Co1/3Mn1/3C2O4·xH2O precursor. compared bare LNCMO, reversible capacity, cycling performance, thermal stability, rate capability, polarization Li2ZrO3@LNCMO have all greatly improved. At 0.1 10 C, specific capacity is 192 106 mAh g–1, respectively, while they are 178 46 g–1 for...

The effects of Li substitution for Ti on the structure and electrochemical performances Co-free Na0.67Mn0.55Ni0.25Ti0.2–xLixO2 (x = 0, 0.1, 0.2) layered cathode materials sodium ion batteries have been comprehensively investigated. X-ray diffraction Rietveld refinement results demonstrate that mainly occupies TM (TM transition metal) sites in crystal to maintain P2 majority a small amount atoms enter Na generate some O3 phase. discharge voltage, reversible capacity, rate capability, cycling...

High-capacity Li-rich Mn-based oxide cathodes show a great potential in next generation Li-ion batteries but suffer from some critical issues, such as, lattice oxygen escape, irreversible transition metal (TM) cation migration, and voltage decay. Herein, comprehensive structural modulation the bulk surface of is proposed through simultaneously introducing vacancies P doping to mitigate these improvement mechanism revealed. First, elongates OO distance, which lowers energy barrier enhances...

We propose the triggering of reversible anion redox chemistry in O3-NaMn 1/3 Fe Ni O 2 cathode by tuning Na/Mn anti-site defects with Ho doping.

High-voltage LiCoO2 (LCO) attracts great interest because of its large specific capacity, but it suffers from oxygen release, structural degradation, and quick capacity drop. These daunting issues root the inferior thermodynamics kinetics triggered anion redox (OAR) at high voltages. Herein, a tuned mechanism with almost only Co is demonstrated by atomically engineered high-spin LCO. The network reduces Co/O band overlap, eliminates adverse phase transition O3 → H1-3, delays exceeding O 2p...

Abstract Garnet‐type solid‐state electrolyte (SSE) Li 6.5 La 3 Zr 1.5 Ta 0.5 O 12 attracts great interest due to its high ion conductivity and wide electrochemical window. But the huge interfacial resistance, dendrite growth, low critical current density (CCD) block practical applications. Herein, a superlithiophilic 3D burr‐microsphere (BM) interface layer composed of ionic conductor LiF‐LaF is constructed in situ achieve high‐rate ultra‐stable lithium metal battery. The 3D‐BM with large...

Garnet solid electrolytes have attracted great interest due to their wide electrochemistry window and high ion conductivity. However, the lithiophobic Li2CO3 generated on garnet surface results in a huge interfacial resistance interface incompatibility. Herein, different from extensive removal or conversion strategies, of Li6.5La3Zr1.5Ta0.5O12 (LLZTO) is directly used as layer suppress Li dendrite growth, lithophilic Li-In-F composite anode. The symmetrical half-cell with interlayer stably...

The synergetic modification mechanism in Li₂ZrO₃-coated Li-rich Li_1.2Mn_0.6Ni_0.2O₂<italic>via</italic> a synchronous lithiation strategy has been proposed.

NiV₃O₈/natural graphite anodes show excellent electrochemical performance <italic>via</italic> a novel <italic>in situ</italic> reconstruction.

Nickel-rich LiNi_0.90Co_0.07Mg_0.03O₂ cathode material with concentration gradient structure exhibits superior high capacity, high-rate capability and cycling stability.