The invention relates to a
phosphate material having a mesoporous structure for
lithium secondary batteries and a preparation method thereof. The material having a mesoporous structure is secondary particles which have a mesoporous spherical or
spheroid shape and are formed by the agglomeration of primary particles; the
chemical composition of the material having the mesoporous structure is represented by the formula of LixAaMmBbPOzNn; the average particle
diameter of the primary particles is 10nm to 1mum, the average particle
diameter of the secondary particles is 100nm to 50mum, the average
pore diameter of mesopores is 2 to 500nm; and the material having the mesoporous structure also comprises a layer of 2 to 100nm thick
carbon coated outside the secondary particles and on the inner walls of the mesopores, wherein the content of the carbon accounts for 1 to 20 weight percent of the total weight of a substrate. The material is prepared by the steps of: firstly preparing pure-phase
phosphate LiMPO4 or doped LiMPO4
sol; secondly, forming dry gel through heat treatment; and finally, forming the
agglomerate secondary particles through
sintering at high temperature. The
phosphate material having the mesoporous structure can be directly used in secondary
lithium batteries as an
anode active material and can also be used by being mixed with the prior
anode material as an additive. The material having the mesoporous structure can improve the rate performance and
energy density of the prior
anode material and batteries. The secondary
lithium batteries containing the phosphate material having the mesoporous structure has
high power density and high safety.