Metal ion doping and carbon coating jointly modified lithium ion battery anode material

Abstract

The invention relates to a battery anode material and discloses a metal ion doping and carbon coating jointly modified lithium ion battery anode material, which comprises a lithium iron phosphate anode substrate synthesized by using LiOH.H2O and FePO4.4H2O, and is characterized in that: the lithium iron phosphate anode substrate contains at least one metal ion which may be Mn<2+>, Ni<2+>, Co<3+>, Cu<2+>, Zn<2+>, Zr<4+>, Al<3+>, Sn<4+>, Nb<5+>, Mg<2+> or Ti<4+>; and the surface of the lithium iron phosphate anode substrate is uniformly coated with carbon. In the lithium ion battery anode material, the metal ion is doped at the lithium position to produce a lithium ion vacancy in the crystal lattice of the lithium iron phosphate, so the electron conductivity and ionic diffusion coefficient of the lithium ion battery anode material are improved and the discharge capacity and the circulation stability of the lithium ion battery anode material are improved. The method for manufacturing metal ion doping and carbon coating jointly modified lithium ion battery anode material is simple, easy to implement, obvious in effect and low in cost.

Description

technical field

[0001] The invention relates to a battery positive electrode material, in particular to a modified lithium ion battery positive electrode material which improves electron conductivity and ion diffusion coefficient. Background technique

[0002] Lithium-ion batteries have the advantages of high specific energy, high power, long service life, and good safety performance. They have been widely used in portable devices such as mobile phones, cameras, and notebook computers, and have shown good application prospects in the field of electric vehicles. , has received increasing attention.

[0003] The development of new cathode materials with low cost, high specific energy, environmental friendliness and long life has become the mainstream research direction of lithium-ion batteries. The cathode materials of lithium-ion batteries mainly include lithium cobaltate, lithium manganese oxide and lithium iron phosphate; Compared with other lithium-ion battery cathode mat...

Images