Carbon coated NaLi0.2Mn0.8O2 as a superb cathode material for sodium ion batteries

Chemical Preintercalation of H2V3O8‐reduced Graphene Oxide Composites for Improved Na‐ and Li‐ion Battery Cathodes

“…Similar to previous studies, the CVs show four redox pairs for Li + intercalation, labeled O 1Li ‐O 4Li and R 1Li ‐R 4Li , and two redox pairs for Na + intercalation (O 1Na , O 2Na, R 1Na , R 2Na ) respectively [30,36] . For both Li + and Na + intercalation and for all measured rates HVO‐rGO composites show higher integrated current densities in comparison to HVO (see Table S5), which was already shown in literature for HVO and other materials [4,28] . This results probably from the fact that a larger fraction of the active material is electrochemically more easily accessible, since rGO composite formation improves the interconnectivity of the HVO fibers, as shown by SEM (see Figure 2).…”

“…However, Li is listed as critical material since few countries primarily control the Li reserves. In addition the increasing demand of Li causes its price to raise [4–6] . Therefore, alternatives are desirable exhibiting properties similar to Li in terms of low redox potential, but featuring higher accessibility and lower cost.…”

Multiphase layered transition metal oxide positive electrodes for sodium ion batteries

“…The simplicity of the liquid‐based coating technique is an additional benefit. Coatings (including, but not limited to) of NaPO 3 , 90,114,115 NaTi 2 (PO 4 ) 3 , 86,116 Na 2 Ti 6 O 13 , 117 NaCaPO 4 , 87 AlPO 4 , 89 Al 2 O 3 , 73,118 carbon, 112 Mg 1− x Ni x O 88 have all been demonstrated using liquid based coating techniques to enhance the electrochemical properties of various LTMOs as positive electrodes for SIBs.…”

“…110 These nanoscale coatings can improve air stability, structural and thermal stability, suppress TM dissolution, enhance sodium ion transport, and modify reaction with the electrolyte. 22,[70][71][72]74,94,111 Surface coating methods such as sol-gel and wet chemical process, 73,86,89,112 meltimpregnation, 90 and magnetron sputtering 113 can all provide significant performance benefits, but may not achieve the high degree of conformality and thickness uniformity provided by more complex techniques such as atomic layer deposition (ALD). [70][71][72]94 Surface phases may also spontaneously (partially) segregate from the bulk.…”

Synthesis of Na ion‐electron mixed conductor Na3Zr2Si2PO12 by doping with transition metal elements (Co, Fe, Ni)

“…23,24 The coating materials should have properties such as chemical stability, electrochemical stability, mechanical stability, good ionic conductivity, and electronic conductivity. Oxides (Al 2 O 3 , ZrO 2 , Co 3 O 4 ), 15,24,25,26 phosphates (NaPO 3 , AlPO 4, FePO 4 ), [27][28][29] and conductive carbon 30,31 have been used as coating materials, and the cycle stability of cathode materials is effectively improved. Among them, graphite has high electronic conductivity, which can increase the surface conductivity of the cathode material.…”