Abstract: The disclosure provides a coated positive electrode active material particle including an active material having the general chemical formula AxMyEz(XO4)q, wherein A is an alkali metal or an alkaline earth metal, M includes cobalt, E is a non-electrochemically active metal, a boron group element, or silicon or any alloys or combinations thereof, X is phosphorus or sulfur or a combination thereof, 0<x?1, y>0, z?0, q>0, and the relative values of x, y, z, and q are such that the general chemical formula is charge balanced. The disclosure provides a method of attritor-mixing the active material. The disclosure provides an alkali metal or alkaline earth metal rechargeable battery including an electrolyte including an ionic liquid and an alkali metal salt or alkaline earth metal salt. The battery includes a pressure application system that applies pressure to at least a portion of the electrode surfaces contacting the electrolyte.

Abstract: The disclosure provides an alkali metal or alkaline earth metal rechargeable battery including an electrolyte including an ionic liquid and an alkali metal salt or alkaline earth metal salt. The battery also includes a negative electrode including a surface that contacts the electrolyte. The negative electrode also includes a negative electrode active material. The battery further includes a positive electrode including a surface that contacts the electrolyte. The positive electrode also includes a positive electrode active material. The battery also includes an electronically insulative separator between the positive electrode and the negative electrode and a casing surrounding the electrolyte, electrodes, and separator. The battery additionally includes a pressure application system that applies pressure to at least a portion of the electrode surfaces contacting the electrolyte.

Abstract: A positive electrode material having a nominal stoichiometry Li1+y/2Co1?x?y?z?dSizFexMyM?d(PO4)1+y/2 where M is a trivalent cation selected from at least one of Cr, Ti, Al, Mn, Ni, V, Sc, La and/or Ga, M? is a divalent cation selected from at least one of Mn, Ni, Zn, Sr, Cu, Ca and/or Mg, y is within a range of 0<y?0.10 and x is within a range of 0?x?0.2. The use of double compositional modification to LiCoPO4 increases the discharge capacity from ˜100 mAh/g to about 130 mAh/g while retaining the discharge capacity retention of the singly Fe-substituted LiCoPO4. Additional compositional modification to include Si increases the cycle life and greatly improved the coulombic efficiency to between 97-100% at a C/3 cycle rate.

Abstract: A positive electrode material having a nominal stoichiometry Li1+y/2Co1?x?y?z?dSizFexMyM?d(PO4)1+y/2 where M is a trivalent cation selected from at least one of Cr, Ti, Al, Mn, Ni, V, Sc, La and/or Ga, M? is a divalent cation selected from at least one of Mn, Ni, Zn, Sr, Cu, Ca and/or Mg, y is within a range of 0<y?0.10 and x is within a range of 0?x?0.2. The use of double compositional modification to LiCoPO4 increases the discharge capacity from ˜100 mAh/g to about 130 mAh/g while retaining the discharge capacity retention of the singly Fe-substituted LiCoPO4. Additional compositional modification to include Si increases the cycle life and greatly improved the coulombic efficiency to between 97-100% at a C/3 cycle rate.

Abstract: A positive electrode material having a nominal stoichiometry Li1+y/2Co1?x?y?z?dSizFexMyM?d(PO4)1+y/2 where M is a trivalent cation selected from at least one of Cr, Ti, Al, Mn, Ni, V, Sc, La and/or Ga, M? is a divalent cation selected from at least one of Mn, Ni, Zn, Sr, Cu, Ca and/or Mg, y is within a range of 0<y?0.10 and x is within a range of 0?x?0.2. The use of double compositional modification to LiCoPO4 increases the discharge capacity from ˜100 mAh/g to about 130 mAh/g while retaining the discharge capacity retention of the singly Fe-substituted LiCoPO4. Additional compositional modification to include Si increases the cycle life and greatly improved the coulombic efficiency to between 97-100% at a C/3 cycle rate.

Abstract: A positive electrode material having a nominal stoichiometry Li1+y/2Co1?x?y?z?dSizFexMyM?d(PO4)1+y/2 where M is a trivalent cation selected from at least one of Cr, Ti, Al, Mn, Ni, V, Sc, La and/or Ga, M? is a divalent cation selected from at least one of Mn, Ni, Zn, Sr, Cu, Ca and/or Mg, y is within a range of 0<y?0.10 and x is within a range of 0?x?0.2. The use of double compositional modification to LiCoPO4 increases the discharge capacity from ˜100 mAh/g to about 130 mAh/g while retaining the discharge capacity retention of the singly Fe-substituted LiCoPO4. Additional compositional modification to include Si increases the cycle life and greatly improved the coulombic efficiency to between 97-100% at a C/3 cycle rate.

Abstract: A positive electrode material having a nominal stoichiometry Li1+y/2Co1?x?y?z?dSizFexMyM?d(PO4)1+y/2 where M is a trivalent cation selected from at least one of Cr, Ti, Al, Mn, Ni, V, Sc, La and/or Ga, M? is a divalent cation selected from at least one of Mn, Ni, Zn, Sr, Cu, Ca and/or Mg, y is within a range of 0<y?0.10 and x is within a range of 0?x?0.2. The use of double compositional modification to LiCoPO4 increases the discharge capacity from ˜100 mAh/g to about 130 mAh/g while retaining the discharge capacity retention of the singly Fe-substituted LiCoPO4. Additional compositional modification to include Si increases the cycle life and greatly improved the coulombic efficiency to between 97-100% at a C/3 cycle rate.

Abstract: A positive electrode material having a nominal stoichiometry Li1+y/2Co1?x?y?z?dSizFexMyM?d(PO4)1+y/2 where M is a trivalent cation selected from at least one of Cr, Ti, Al, Mn, Ni, V, Sc, La and/or Ga, M? is a divalent cation selected from at least one of Mn, Ni, Zn, Sr, Cu, Ca and/or Mg, y is within a range of 0<y?0.10 and x is within a range of 0?x?0.2. The use of double compositional modification to LiCoPO4 increases the discharge capacity from ˜100 mAh/g to about 130 mAh/g while retaining the discharge capacity retention of the singly Fe-substituted LiCoPO4.