Multielement doped lithium phosphate anode material and preparation method

Abstract

The invention aims at providing a multielement doped lithium phosphate anode material which is good in conductivity and long in cycle life, and improves the energy density of an anode material for the existing power cell, and a preparation method of the anode material. According to the anode material and the preparation method, the conductivity and the cycle life of the lithium phosphate anode material are improved and prolonged successfully and / or the energy density of the anode material for the existing power cell is improved by selecting a doped element combination and strictly controlling the content of components of the combination. In a synthetic process of the anode material, little iron in lithium iron phosphate is substituted by doping metal ions (Ti<4+> and Mn<4+>) to improve the conductivity of a lithium iron phosphate material, and the conductivity of an LiFe1-x-yTi0.5xMn0.1-yPO4 / C composite material is improved mainly by adopting a method of performing carbon coating on the lithium iron phosphate material twice by blending twice and adding a carbon source twice, so that the high multiplying power charge and discharge energy of the anode material is further improved. The anode material and the preparation method are applicable to the field of cells.

Description

technical field [0001] The invention relates to a positive electrode material for a lithium ion battery and a preparation method thereof. More specifically, the invention relates to a multi-element doped lithium phosphate positive electrode material and a preparation method thereof. Background technique [0002] LiFePO with olivine structure 4 It has obvious advantages such as being friendly to the environment, high energy density, particularly excellent cycle performance, and the best safety performance, and its synthetic raw material resources are abundant and low in price, and it is unanimously recognized as a driving force for manufacturing high safety, low cost, and long life The best cathode material for lithium-ion batteries is one of the most potential new energy materials and has become a sought-after object in the battery industry and new energy material manufacturing industry. However, lithium iron phosphate has the defects of the material itself: low conductivit...

AI Technical Summary

Problems solved by technology

However, lithium iron phosphate has the defects of the material itself: low conductivity and poor rate performance, which greatly limit its wide application in the practical field; and the preparation process is relatively complicated (there are many types of raw materials, difficult to mix); synthesis The conditions are relatively harsh (inert gas protection); the requirements for equipment are relatively high (good airtightness), which further limits its large-scale industrialization

However, its preparation method is complicated and requires professional and technical personnel to complete the operation, and the labor cost is relatively high.

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