Positive electrode active material and electrochemical cell comprising the positive electrode active material
A positive electrode active material includes a plurality of lithium nickel phosphate nanoparticles having an olivine structure and having an exposed surface that is a {111} crystal plane. The positive electrode active material can be used in a positive electrode for an electrochemical cell.
1. A positive electrode active material comprising:
a plurality of lithium nickel phosphate nanoparticles having an olivine structure and having an exposed surface that is a {111} crystal plane;
wherein the {111} crystallographic plane is 20% to 95% of a total surface area of the nanoparticles.
2. The positive electrode active material of claim 1 , wherein the nanoparticles comprise a (010) surface, and a ratio of the total area of the (010) crystal plane to the {111} crystal plane is 1:9 to 9:1.
3. The positive electrode active material of claim 1 , wherein the nanoparticles comprise a (201) surface, and a ratio of the total area of the (201) crystal plane to the {111} crystal plane is 1:9 to 9:1.
4. The positive electrode active material of claim 1 , wherein the plurality of lithium nickel phosphate nanoparticles has an average particle diameter of less than 100 nanometers.
5. The positive electrode active material of claim 1 , wherein the {111} crystal plane is a (111) crystal plane.
6. The positive electrode active material of claim 1 , wherein the lithium nickel phosphate nanoparticles comprise LiNi(PO 4 ).
7. A positive electrode comprising the positive electrode active material of claim 1 .
8. An electrochemical cell comprising
the positive electrode of claim 7 ;
a negative electrode; and
a separator between the positive electrode and the negative electrode.
9. An electrochemical cell comprising
the positive electrode of claim 7 ;
a negative electrode; and
a solid electrolyte between the positive electrode and the negative electrode.