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Lithium zinc silicate (Li 3 Zn 0.5 SiO 4 ) is a structural analog of the lithium superionic conductor (LISICON) family. In this study, we synthesized a LISICON-type lithium zinc silicate, namely Li 3 Zn 0.5 SiO 4 , from an aqueous solution and found that the electrical conductivity was improved after loading the silicate with 0 to 0.10 mol % Cr, Co, or Ni. X-ray diffraction (XRD) analysis revealed that single-phase Li 3 Zn 0.5 SiO 4 was obtained at 900 °C for 5 h. The Li 3 Zn 0.5 SiO 4 exhibited a similar phase to that of basic Li 3 Zn 0.5 SiO 4 when loaded with less than 0.05 mol % of Cr, Co, or Ni. The electrical conductivity of the synthesized Li 3 Zn 0.5 SiO 4 was found to be 3.12 © 10 ¹7 and 2.13 © 10 ¹2 S•cm ¹1 at 50 and 300 °C, respectively. The addition of Cr, Co, or Ni to the Li 3 Zn 0.5 SiO 4 further enhanced the electrical conductivity. Li 3 Zn 0.45 Ni 0.05 SiO 4 exhibited an electrical conductivity of 7.54 © 10 ¹6 and 4.35 © 10 ¹2 S•cm ¹1 at 50 and 300 °C, respectively.

Sodium manganese oxide for a cathode material of sodium-ion secondary battery was rapidly synthesized in 5 15 min by an improved microwave heating method with boron addition. Although prepared cathode materials included three types of Na X MnO 2 , it exhibited good electrochemical performance and delivered an initial discharge capacity of 200 mA h g ¹1 at second discharge. Electrochemical activation of ¢-NaMnO 2 to ¡-NaMnO 2 during chargedischarge process was indicated by X-ray diffraction results.