Electrode material, paste, electrode plate, and lithium ion battery
An electrode material includes Fe-containing olivine-structured Li x A y D z PO 4 (wherein A represents one or more elements selected from the group consisting of Co, Mn, Ni, Cu, and Cr; D represents one or more elements selected from the group consisting of Mg, Ca, Sr, Ba, Ti, Zn, B, Al, Ga, In, Si, Ge, Sc, Y, and rare earth elements; 0<x≤2; 0<y≤1; and 0≤z≤1.5) particles that are coated with a carbon coating film, in which an abundance of Fe is 0.01 to 0.1 mol with respect to 1 mol of Li x A y D z PO 4 , and an abundance ratio (Fe/(Fe+A+D)) of Fe on surfaces of the Li x A y D z PO 4 particles is 0.02 to 0.25.
1. An electrode material comprising
olivine-structured particles of the formula LiMnPO 4 , containing Fe on surfaces thereof, that are coated with a carbon coating film,
wherein an abundance of Fe is 0.03 to 0.1 mol with respect to 1 mol of LiMnPO 4 , and
an abundance ratio (Fe/(Fe+Mn) of Fe on surfaces of the LiMnPO 4 particles is 0.08 to 0.227.
2. The electrode material according to claim 1 ,
wherein the abundance of Fe is decreased from the surfaces of the LiMnPO 4 particles toward centers of the Li x Mn y PO 4 particles.
3. The electrode material according to claim 1 , comprising
aggregated particles that are obtained by allowing the LiMnPO 4 particles to aggregate.
4. A paste comprising:
the electrode material according to claim 1 ;
a conductive auxiliary agent; and
a binder.
5. An electrode plate which is obtained by forming an electrode on a principal surface of a current collector using the paste according to claim 4 .
6. A lithium ion battery comprising
the electrode plate according to claim 5 .
7. The electrode material according to claim 1 , wherein the power capacity, which is calculated from the result of measuring the current capacity at a discharge current of 0.1 C, is 576 m Wh/g or higher.
8. The electrode material according to claim 1 , wherein an abundance ratio (Fe/(Fe+Mn) of Fe on surfaces of the LiMnPO 4 particles is 0.08 to 0.20.