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Modified lithium manganate positive pole material and preparation method thereof

A cathode material, lithium manganate technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problem that high temperature cycle performance is not significantly improved, and achieve the effect of improving normal temperature cycle performance, reducing dissolution, and good high temperature performance.

Active Publication Date: 2014-12-24
宁波富理电池材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can improve the normal temperature cycle performance of the material, its high temperature cycle performance has not been significantly improved.

Method used

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  • Modified lithium manganate positive pole material and preparation method thereof
  • Modified lithium manganate positive pole material and preparation method thereof
  • Modified lithium manganate positive pole material and preparation method thereof

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preparation example Construction

[0066] The present invention also provides a method for preparing the modified lithium manganate positive electrode material described in the above technical solution, comprising the following steps:

[0067] a) Preheating after mixing manganese-containing compound, lithium-containing compound and A-containing compound to obtain the first sintered body, wherein A is Li, Na, Mg, Ti, V, Cr, Fe, Mn, Co, Ni, One or more of Cu, Zn, Zr, Nb, Ce, Nd and Dy;

[0068] b) mixing the first sintered body obtained in step a) with a compound containing M and then firing to obtain a second sintered body, wherein M is one or more of B, Al, Ga and In;

[0069] c) Annealing the second sintered body obtained in the step b) to obtain a modified lithium manganate positive electrode material.

[0070] In the present invention, the manganese-containing compound, the lithium-containing compound and the A-containing compound are firstly preheated, so that A replaces part of the Mn element to form a ma...

Embodiment 1～10

[0091] According to the raw materials, dosage and conditions shown in Table 1, the lithium manganate material was prepared according to the following steps:

[0092] Uniformly mixing manganese-containing compound, lithium-containing compound and A-containing compound, preheating, cooling, and grinding to obtain the first sintered body; mixing the obtained first sintered body with M-containing compound, roasting, cooling, and grinding to obtain the first sintered body A second sintered body: annealing the obtained second sintered body, and cooling to room temperature to obtain a modified lithium manganate positive electrode material.

[0093] Table 1 The formula and conditions for preparing the modified lithium manganate cathode material in Examples 1-10 of the present invention

[0094]

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Abstract

The invention provides a modified lithium manganate positive pole material which comprises a main body material and oxide particles which are discontinuously distributed on the surface of the main body material, wherein the main body material is composed of a compound disclosed as Formula (I) in specific atomic ratio; the chemical formula of the oxide is disclosed as Formula (II); and the mol ratio of the oxide particles to the main body material is y, and 0<y<=0.5. The invention also provides a preparation method of the modified lithium manganate positive pole material. In the modified lithium manganate positive pole material provided by the invention, the oxide particles on the surface first react with trace amounts of HF in the electrolyte to reduce the dissolution of the element manganese in the main body material, so that the lithium ion battery has favorable high temperature property and filling property. The oxide particles are discontinuously distributed on the surface of the main body material, but not coated on the surface of the main body material, thereby avoiding impedance increase due to the existence of the coating layer.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a modified lithium manganate cathode material and a preparation method thereof. Background technique [0002] As a reusable secondary battery, 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. With the country's emphasis on green energy and people's deepening awareness of the energy crisis, lithium-ion power batteries, as a key component of electric vehicles and hybrid vehicles, have become the focus of attention. [0003] The performance of lithium-ion batteries depends critically on the performance of its positive electrode materials. The commercialized positive electrode materials include lithium cobaltate, lithium manganate, lithium iron phosphate, etc. Among them, lithium cobaltate has the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/1397
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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