Rechargeable lithium battery and a method of making a rechargeable lithium battery

A method of making a rechargeable lithium battery comprising:

• mixing a Li raw material, an Al raw material, an M raw material and a PO4 raw material in a predetermined ratio to prepare a first product;
• heating the first product to obtain a second product;
• pulverizing the second product to obtain a third product;
• heating the third product to obtain a fourth product;
• pulverizing the fourth product to obtain a fifth product;
• precipitating the fifth product to obtain a sixth product;
• mixing the sixth product with a lithium metal oxide to obtain a seventh product;
• and heating the seventh product to obtain a positive active material;
• coating the positive active material on a positive collector preparing a positive electrode;
• providing a separator comprising a porous substrate and a coating layer comprising a ceramic material disposed on at least one side of the porous substrate;
• combining a negative electrode with the positive electrode and the separator,
• wherein the separator is disposed between the positive electrode and the negative electrode, and
• wherein M is at least one selected from Ti, Cr, Ga, Fe, Sc, In, Y, Mg, and Si.