Production method of high-capacity high-compaction lithium iron phosphate anode material

Abstract

The invention discloses a production method of a high-capacity high-compaction lithium iron phosphate anode material. The high-capacity high-compaction lithium iron phosphate anode material is prepared by adopting a multi-time compaction and sintering method, a purpose for improving the compaction density, the electrochemical gram capacity and cycling performance of the lithium iron phosphate can be effectively realized, a lithium iron phosphate primary crystalline phase is formed through the primary sintering, titanium, magnesium and manganese crystals are fused into the lithium iron phosphate crystalline structure through the secondary doping sintering, the lithium iron phosphate nanometer crystal is completely coated with carbon through the tertiary sintering after the carbon-cladding, and the conductivity of the lithium iron phosphate monocrystal is improved. A produced lithium iron phosphate lithium-ion battery has the advantages of high charging-discharging efficiency, good cycling stability, high compaction density, large electrochemical gram capacity, good cycling performance and the like, the production cost of a power battery can be greatly reduced, and the lithium iron phosphate is enabled to be an optimal anode material for the power lithium-ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery cathode material processing, in particular to a lithium iron phosphate (LiFePO 4 ) A method for producing a high-capacity and high-compression lithium iron phosphate cathode material by compacting and sintering the cathode material. Background technique [0002] Cathode materials are an important part of lithium-ion batteries. At present, the widely used cathode materials for lithium-ion batteries include metal oxides such as LiMO with a layered structure. 2 (M=Co Ni) and spinel lithium manganese oxide (LiMn 2 o 4 ), of which lithium cobaltate (LiCoO 2 ) are expensive, resource-poor and highly toxic, lithium nickelate (LiNiO 2 ) is difficult to prepare and has poor thermal stability, LiMn 2 o 4 The capacity is low and the cycle stability is poor. The development of high-performance and low-cost lithium-ion battery cathode materials has become a hot topic in the field of lithium-i...

AI Technical Summary

Problems solved by technology

[0002] Cathode materials are an important part of lithium-ion batteries. At present, the widely used cathode materials for lithium-ion batteries include metal oxides such as LiMO with a layered structure. 2 (M=Co Ni) and spinel lithium manganese oxide (LiMn 2 o 4 ), of which lithium cobaltate (LiCoO 2 ) are expensive, resource-poor and highly toxic, lithium nickelate (LiNiO 2 ) is difficult to prepare and has poor thermal stability, LiMn 2 o 4 The capacity is low and the cycle stability is poor. The development of high-performance and low-cost lithium-ion battery cathode materials has become a hot topic in the field of lithium-ion battery material research.

[0003] Lithium iron phosphate has been widely studied and applied due to its high charge and discharge efficiency, good cycle stability, more durable battery, high safety, low price and abundant resources. And the tap density is small, which greatly limits the application of this zero-pollution cathode material