Methods are presented for synthesizing metal cyanometallate (MCM). A first method provides a first solution of A.sub.XM2.sub.Y(CN).sub.Z, to which a second solution including M1 is dropwise added. As a result, a precipitate is formed of A.sub.NM1.sub.PM2.sub.Q (CN).sub.R..sub.FH.sub.2O, where N is in the range of 1 to 4. A second method for synthesizing MCM provides a first solution of M2.sub.C(CN).sub.B, which is dropwise added to a second solution including M1. As a result, a precipitate is formed of M1[M2.sub.S(CN).sub.G].sub.1/T..sub.DH.sub.2O, where S/T is greater than or equal to 0.8. Low vacancy MCM materials are also presented.

Methods are presented for synthesizing metal cyanometallate (MCM). A first method provides a first solution of A.sub.XM2.sub.Y(CN).sub.Z, to which a second solution including M1 is dropwise added. As a result, a precipitate is formed of A.sub.NM1.sub.PM2.sub.Q (CN).sub.R..sub.FH.sub.2O, where N is in the range of 1 to 4. A second method for synthesizing MCM provides a first solution of M2.sub.C(CN).sub.B, which is dropwise added to a second solution including M1. As a result, a precipitate is formed of M1[M2.sub.S(CN).sub.G].sub.1/T..sub.DH.sub.2O, where S/T is greater than or equal to 0.8. Low vacancy MCM materials are also presented.

A system and method implementing and manufacturing transition metal cyanide coordination compounds (TMCCC) comprising Na, Fe, Mn, C, H, N, S, and O, wherein the TMCCC have 0-14% hexacyanometallate vacancies such as for application in electrochemical cells, including sodium ion secondary batteries; further including both sodium and potassium with and without sulfate.

A system and method implementing and manufacturing transition metal cyanide coordination compounds (TMCCC) comprising Na, Fe, Mn, C, H, N, S, and O, wherein the TMCCC have 0-14% hexacyanometallate vacancies such as for application in electrochemical cells, including sodium ion secondary batteries; further including both sodium and potassium with and without sulfate.

A system and method implementing and manufacturing transition metal cyanide coordination compounds (TMCCC) comprising Na, Fe, Mn, C, H, N, S, and O, wherein the TMCCC have 0-14% hexacyanometallate vacancies such as for application in electrochemical cells, including sodium ion secondary batteries.

A system and method implementing and manufacturing transition metal cyanide coordination compounds (TMCCC) comprising Na, Fe, Mn, C, H, N, S, and O, wherein the TMCCC have 0-14% hexacyanometallate vacancies such as for application in electrochemical cells, including sodium ion secondary batteries.

The present invention pertains to a double metal cyanide complex catalyst in a form of particles, wherein a 50% cumulative volume particle diameter determined from a cumulative volumetric particle size distribution obtained by a laser diffraction scattering method in the double metal cyanide complex catalyst is from 0.01 to 4.0 m, and a content of the particles having a particle diameter of 11 m or more with respect to the total volume of the double metal cyanide complex catalyst is 10% by volume or less.

The present invention pertains to a double metal cyanide complex catalyst in a form of particles, wherein a 50% cumulative volume particle diameter determined from a cumulative volumetric particle size distribution obtained by a laser diffraction scattering method in the double metal cyanide complex catalyst is from 0.01 to 4.0 m, and a content of the particles having a particle diameter of 11 m or more with respect to the total volume of the double metal cyanide complex catalyst is 10% by volume or less.