Application of iron phosphate and iron phosphate composite as anode in lithium ion battery

Abstract

The invention relates to application of iron phosphate and iron phosphate composite as an anode in a lithium ion battery. The iron phosphate composite is prepared from an iron phosphate doping material and a coating material of the iron phosphate doping material or an iron phosphate coating material. The iron phosphate doping material is LixFePO4, FexM[1-x]PO4 or LiFeMPO4, wherein M is a metal ornonmetal element except Li, and x is less than 1. The iron phosphate coating material is N@FePO4, wherein N is a metal or nonmetal element coating the surface of the FePO4 material. The coating material of the iron phosphate doping material is N@LixFePO4, N@FexM[1-x]PO4 or N@LiFeMPO4, wherein N is a metal or nonmetal element coating the surface of the material LixFePO4, FexM[1-x]PO4 or LiFeMPO4. The iron phosphate and iron phosphate composite provided by the invention have a function of storing lithium ions and converting the lithium ions into lithium iron phosphate or lithium iron phosphate composite; the lithium iron phosphate or lithium iron phosphate composite is converted into iron phosphate or iron phosphate composite through removal of lithium ions; thus, the iron phosphate and ironphosphate composite have a function of storing lithium ions.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to the application of iron phosphate and iron phosphate composite materials as negative electrodes in lithium ion batteries. Background technique [0002] In recent years, the energy crisis has become increasingly serious, and the demand for new energy has become increasingly urgent. Research and development of new alternative energy sources and energy conservation and emission reduction has important developmental strategic significance. As a green and environmentally friendly new energy source, lithium-ion batteries have attracted more and more attention. A new type of lithium-ion battery with high capacity, long life and high safety has become the goal pursued by people. [0003] The anode material of lithium ion battery is an important part of the battery, and the anode material plays a pivotal role in the development of the battery. The current anode material...

AI Technical Summary

Problems solved by technology

But Li 4 Ti 5 o 12 Anode materials have the following two disadvantages: first, the price and cost of titanium elements are relatively high, and the synthesis cost is also high, which affects the large-scale industrialization of materials; second, Li 4 Ti 5 o 12 Negative electrode materials are prone to over-discharge and over-charge phenomena, and produce a large amount of gas, which seriously affects the battery cycle performance

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