Positive electrode material for lithium ion cell, its preparing method and lithium ion cell

Abstract

The disclosed electrode piece of LiMn2O4 is modified by polymer, which contains functional group of possessing complexation capability with Mn ion. The electrode piece solves issue of difficulties for cladding oxide and thin grains in LiMn2O4 material modified by conductive polymer as well as issue of easy dropping-out clad caused by regrinding. Since effects of complexation and valence bond between polar group of polymer and Mn ions at surfaces of LiMn2O4 grains, oxygenolysis ability of Mn4+ ions for electrolyte and disproportionation degree happened in Mn3+ ions are reduced so as to prevent digestion and migration of lithium ions and increase cyclical stability in high temperature of lithium cell by using LiMn2O4 as positive pole. Features of preparing technique are: simple, feasible and value of industrialization.

Description

technical field

[0001] The invention relates to a lithium ion battery cathode material, in particular to a lithium manganate cathode material. Background technique

[0002] In today's information society, chemical power sources are increasingly valued by people. Among them, lithium-ion batteries have become the energy source of many portable electronic devices and electric vehicle power systems due to their high operating voltage, high energy density, and low environmental pollution. The earliest commercialized lithium-ion battery, that is, the positive electrode material used by most of the current market is LiCoO 2 . Because cobalt resources are scarce, expensive, and harmful to the environment, people are urgently looking for an alternative to LiCoO 2 positive electrode material. Spinel LiMn 2 o 4 Due to the advantages of abundant resources, low price, environmental friendliness and simple synthesis, it has always been a research hotspot, and is considered to be the ...

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