Electrode materials

摘要

A process for forming a surface-treatment layer on an electroactive material includes heating the electroactive material and exposing the electroactive material to a reducing gas to form a surface-treatment layer on the electroactive material, where the surface-treatment layer is a layer of partial reduction of the electroactive material.

主权项

1. A process of forming a positive active material or a negative active material, the process comprising:
heating an electroactive material under an inert atmosphere; and exposing the electroactive material to H2; wherein:
the exposing is conducted at a temperature of 200° C. to 400° C.;the electroactive material is the positive active material or the negative active material;the positive active material comprises a spinel, LiNi1-xCoyMetzO2, LiMet0.5Mn1.5O4, LiMet0.5Mn1.5O4, Li1+x′NiαMnβCoγMet′δO2-z′Fz′, or An′B2(XO4)3;the negative active material comprises Li4Ti5O12, TiO2, LiMOx, nitrides, phosphides, intermetallic compounds, or a metal oxide;M and M′ are metals;Met is Al, Mg, Ti, B, Ga, Si, Mn, or Co;Met′ is Mg, Zn, Al, Ga, B, Zr, or Ti;A is Li, Ag, Cu, Na, Mn, Fe, Co, Ni, Cu, or Zn;B is Ti, V, Cr, Fe, or Zr;X is S, Si, W, or Mo;a+b>0; and0≦a≦2, 0≦b≦2, 0≦x≦0.3, 0≦y≦0.5, 0≦z≦0.5; 0≦x′≦0.4, 0≦α≦1, 0≦β≦1, 0≦γ≦1, 0≦δ≦0.4, and 0≦z′≦0.4; and 0≦n′≦3.