Lithium-manganese-aluminum oxygen anode material and preparation method thereof

A lithium manganese aluminum oxide cathode and cathode material technology, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as lattice defects, poor rate performance of lithium manganate materials, and inability to effectively block corrosion, so as to avoid crystal lattice defects. The formation of lattice defects, the improvement of high temperature cycle performance, and the effect of improving rate performance

CN102683667AActive Publication Date: 2012-09-19NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2012-09-19

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Abstract

The invention provides a lithium-manganese-aluminum oxygen anode material, which has the atomic ratio of LiaMn2-x-yAlxMyO4; the concentration of A1 is in a gradient distribution presenting gradually risen from the inner part of the lithium-manganese-aluminum oxygen anode material to the surface; the concentration of Mn is in a gradient distribution presenting gradually decreased from the inner part of the lithium-manganese-aluminum oxygen anode to the surface. The invention further provides a preparation method of lithium-manganese-aluminum oxygen anode material. By adding solution or turbid liquid of aluminum source compound in the precipitation process, the aluminum element replaces the position of a manganese element in the formed lithium-manganese-aluminum material, so that the spinel structure of the lithium-manganese-aluminum material is stabilized, the forming of the lattice defect is avoided and the well high-temperature circulating performance of the lithium-manganese-aluminum material is guaranteed, the dissolution of manganese in the electrolyte is reduced and the high-temperature circulating performance of the lithium-manganese-aluminum oxygen anode material is further improved.
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Description

technical field

[0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium-manganese-aluminum-oxygen cathode material and a preparation method thereof. Background technique

[0002] As a new type of energy storage system, lithium-ion batteries have the advantages of good safety, high discharge specific energy, and long charge and discharge life. They have been widely used in digital products, electric tools, and electric bicycles. Lithium cobalt oxide, lithium manganese oxide and lithium iron phosphate have been commercially produced as positive electrode materials for lithium ion batteries. However, lithium cobalt oxide is expensive and has poor safety performance; lithium iron phosphate has poor filling performance and low volume specific energy Although lithium manganate has the advantages of high discharge voltage, low price, abundant reserves, and high safety performance, its high-temperature cycle performance is poor, which...

Examples

preparation example Construction

[0040] Correspondingly, the present invention also provides a preparation method of lithium manganese aluminum oxygen cathode material, comprising the following steps:

[0041] Mix manganese source compound, M source compound with the first solvent to obtain the first solution or suspension, M is Li, Mg, Ti, V, Cr, Fe, Mn, Co, Ni, Cu, Zn, Zr , one or more of Nb, Pd, Ce, Nd and Dy;

[0042] mixing the aluminum source compound with a second solvent to obtain a second solution or a second suspension;

[0043] Add a precipitating agent to the first solution or the first suspension for precipitation, add the second solution or the second suspension during the precipitation process, and gradually increase the amount of the second solution or the second suspension After stirring, a precipitate with a gradient distribution of aluminum elements is formed, and a precursor is obtained after drying, and the precipitating agent is an alkali metal hydroxide solution, an alkali metal carbon...

Embodiment 1～10

[0061] According to the raw materials, dosage and conditions shown in Table 1, the lithium manganese aluminum oxide cathode material precursor with gradient structure was prepared according to the following steps:

[0062] Manganese source compound, M source compound and the first solvent are mixed to obtain the first solution or the first suspension; the aluminum source compound is mixed with the second solvent to obtain the second solution or the second suspension; Add a precipitant to the first solution or the first suspension, add the second solution or the second suspension during the precipitation process, gradually increase the amount of the second solution or the second suspension, and form a gradient distribution of aluminum after stirring Elemental precipitates; drying or roasting the obtained precipitates to obtain precursors.

[0063] Table 1 The formula and conditions for preparing the lithium manganese aluminum oxygen precursor with gradient structure in Examples...