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Coated-modified lithium manganese positive electrode material and preparation method thereof

A positive electrode material, lithium manganese oxide technology, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as large specific surface area, inability to obtain high-temperature cycle performance, and difficulty in uniformly wrapping coating materials, etc., to achieve excellent high-temperature cycle performance, Improve high-temperature cycle performance and reduce the effect of dissolution

Active Publication Date: 2012-07-11
宁波富理电池材料科技有限公司
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  • Abstract
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Problems solved by technology

[0005] However, since the lithium manganate raw materials used in the above-mentioned literatures are composed of secondary particles formed by the agglomeration of primary particles, there are many pores of primary particles on the surface of lithium manganate raw materials, and the specific surface area is large, so it is difficult for the coating material to be uniform. Wrapped on the surface of lithium manganate raw material, so that the ideal high temperature cycle performance cannot be obtained

Method used

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  • Coated-modified lithium manganese positive electrode material and preparation method thereof
  • Coated-modified lithium manganese positive electrode material and preparation method thereof
  • Coated-modified lithium manganese positive electrode material and preparation method thereof

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[0035] Correspondingly, the present invention also provides a method for preparing a coated and modified lithium manganate positive electrode material, comprising the following steps:

[0036] Step a) After uniformly mixing the manganese source compound, the M source compound and the lithium source compound, sintering, crushing, and grading to obtain Li a mn 2-b m b o 4 particles, the Li a mn 2-b m b o 4 The particles have a spherical shape and the crystal planes are connected by curved surfaces without clear edges. M is Li, B, Mg, Ti, V, Cr, Fe, Mn, Co, Ni, Cu, Zn, Zr, Nb, Pd One or more of , Ce, Nd and Dy;

[0037] Step b) the Li a mn 2-b m b o 4 Granules, flux and A source compound are mixed to obtain a mixture, and A is one of Mg, Ti, V, Cr, Fe, Mn, Co, Ni, Cu, Zn, Zr, Nb, Pd, Ce, Nd and Dy or several, A source compound is one or more of A oxide, A phosphate, A silicate and A selenate, 0.9≤a≤1.2, 0≤b≤0.15;

[0038] Step c) roasting, cooling, and crushing the m...

Embodiment 1～10

[0050] According to the raw materials, dosage and conditions shown in Table 1, the coated modified lithium manganate cathode material was prepared according to the following steps:

[0051] Mix the manganese source compound, M source compound and lithium source compound evenly, roast, crush, and classify to obtain single crystal particles with a size of 0.1 μm to 20 μm, spherical shape, and crystal planes connected by curved surfaces without clear edges. Li a mn 2-b m b o 4 Particles are lithium manganese oxide cathode materials;

[0052] Mixing the lithium manganate positive electrode material, the melting agent and the oxide of element A, the phosphate of A, the silicate of A or the selenate of A to obtain a mixture;

[0053] The obtained mixture is sintered, cooled, and crushed to obtain a coated and modified lithium manganate positive electrode material.

[0054] Table 1 The formula and conditions for preparing coated and modified lithium manganate cathode materials i...

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Abstract

The invention discloses a coated-modified lithium manganese positive electrode material and the preparation method thereof. A manganese source compound, an M source compound and a lithium source compound are taken as raw material for preparing LiaMn2 -bMbO4 particles, and then are mixed with molten solvent and A-source compound, so as to obtain coated-modified lithium manganese positive electrode material. Compared with the prior art, the LiaMn2-bMbO4 particles are similar to spheres in shape and are in crystal face connection through curved surfaces which have no clear edges; on one hand, the LiaMn2 -bMbO4 particles have very small specific surface area, so that molten solvent and coating material are more evenly dispersed on the surfaces of the particles, and the control to average thickness of a coating is facilitated; on the other hand, the features have very small surface energy, the coating material is enabled to be more easily to be combined with the LiaMn2 -bMbO4 particles to form the coating. Therefore, the coated-modified lithium manganese positive electrode material has an excellent high temperature cycling performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a coated and modified lithium manganate cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high discharge voltage, good safety, long charge and discharge life, and environmental friendliness. They have been widely used in mobile phones, notebook computers, and digital products. At present, lithium-ion battery cathode materials that have been commercially produced on a large scale include lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, and nickel-cobalt lithium manganese oxide ternary materials. Among them, lithium cobalt oxide has a high discharge specific capacity but is expensive and expensive. Poor safety performance; lithium iron phosphate has good safety performance but poor material consistency; nickel-cobalt lithium manganate ternary material is moderately priced...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/505
CPCY02E60/122Y02E60/10
Inventor 刘兆平夏永高赛喜雅勒图
Owner 宁波富理电池材料科技有限公司
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