A kind of Wo3 coated lithium manganese oxide material and preparation method thereof

Abstract

The invention discloses a WO3-coated lithium manganate material which uses doped lithium manganate LiMn(2-x)MxO(4-delta)Ndelta as a core and WO3 as a coating layer, wherein X is equal to 0-0.15, and delta is equal to 0.01-0.04; M is one or more of Al, Mg, Ga, and Si elements, and N is one or more of F, S and Cl. The invention further discloses a preparation method of the WO3-coated lithium manganate material. The preparation method comprises the following steps: preparing doped lithium manganate LiMn(2-x)MxO(4-delta)Ndelta by using a high-temperature and solid-phase method, then adding prepared doped lithium manganate in an ammonium tungstate solution, uniformly mixing, sintering at a temperature of 350-600 DEG C for 2-10 hours, and cooling to obtain the WO3-coated lithium manganate material. The WO3-coated lithium manganate material disclosed by the invention has a stable lithium manganate interface reaction, and thus normal temperature and high temperature circle stability of lithium manganate is improved; by using WO3 as the coating material, the WO3-coated lithium manganate material does not absorb moisture; compared with zinc phosphate coating, the WO3 coating has the advantage that the hygroscopy is improved; the preparation method is simple in preparation process and convenient to operate; the large-scale production is easily realized.

Description

technical field

[0001] The present invention relates to a WO 3 A coated lithium manganese oxide material and a preparation method thereof belong to the technical field of lithium ion battery electrode materials. Background technique

[0002] Lithium-ion batteries are considered as the preferred batteries to solve energy and environmental problems because of their high charging and discharging voltage, long service life, safety and non-toxicity. Lithium manganese oxide has become one of the most promising cathode materials for lithium-ion batteries due to its abundant resources, low cost, no pollution, simple synthesis process, good safety, and good rate performance. Spinel lithium manganese oxide has a stable structure and has three-dimensional lithium ion channels, which can withstand high-current charging and discharging. It is an ideal power battery cathode material. Lithium-ion batteries that use it as the cathode material of lithium-ion batteries are used in electric b...

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