High-density lithium manganate anode material and preparation method thereof

A high-density lithium manganate, cathode material technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of seldom use, high cost, complex process, etc., and achieve volume specific capacity improvement, small investment, and safety. good performance

Inactive Publication Date: 2010-12-08
GAOYAO CATHODE MATERIAL OF BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the above-mentioned methods all have the disadvantages of complicated process and high cost, so they are rarely used in large-scale production at present.

Method used

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  • High-density lithium manganate anode material and preparation method thereof
  • High-density lithium manganate anode material and preparation method thereof
  • High-density lithium manganate anode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Adopt the following steps to prepare lithium manganate cathode material:

[0039] (1) select the lithium carbonate that selects purity as 99.5%, the electrolytic manganese dioxide that purity is 92% as raw material, analyze pure Sb 2 o 5 and nano Al 2 o 3 As the dopant M1, according to the molar ratio of Li: Mn: Sb: Al = 1.12: 1.9: 0.05: 0.05, mix evenly by dry ball milling;

[0040] (2) Put the mixed raw material into a high-temperature furnace to heat up, keep it warm at 920°C for 4 hours, and cool down with the furnace;

[0041] (3) Take out the above-mentioned once-synthesized material, add 0.5wt% Nb 2 o 5 and 0.3wt% CuO as the dopant M2, the materials are mixed uniformly by dry ball milling;

[0042] (4) Place the uniformly mixed material in a high-temperature furnace, heat up to 800°C, keep it warm for 8 hours, and then cool with the furnace;

[0043] (5) The secondary synthesis material is crushed and sieved to obtain the lithium manganate positive electro...

Embodiment 2

[0048] Adopt the following steps to prepare lithium manganate cathode material:

[0049] (1) select the lithium carbonate that selects purity as 99.5%, the electrolytic manganese dioxide that purity is 92% as raw material, analyze pure Sb 2 o 5 , Nano Al 2 o 3 and analytically pure Co 3 o 4 As the dopant M1, according to the molar ratio of Li: Mn: Sb: Al: Co = 1.12: 1.87: 0.05: 0.04: 0.04, mix evenly by dry ball milling;

[0050] (2) Put the mixed raw material into a high-temperature furnace to heat up, keep it warm at 940°C for 3 hours, and cool down with the furnace;

[0051] (3) Take out the above-mentioned once-synthesized material, add 0.6wt% Nb 2 o 5 and 0.3wt% CuO as the dopant M2, the materials are mixed uniformly by dry ball milling;

[0052] (4) Place the uniformly mixed material in a high-temperature furnace, heat up to 850°C, keep it warm for 8 hours, and then cool with the furnace;

[0053] (5) The secondary synthesis material is crushed and sieved to obt...

Embodiment 3

[0056] Lithium manganate cathode material is prepared according to the method and steps of Example 1, but there are following differences:

[0057] The dopant M1 in step (1) is TiO 2 、Cr 2 o 3 And cerium oxide, its molar ratio is Li: Mn: M1=0.96: 1.99: 0.012;

[0058] In step (2), put it into a high-temperature furnace to heat up, keep the temperature at 900° C. for 6 hours, and cool down with the furnace;

[0059] Add V in step (3) 2 o 5 , CuO, and ZnO are used as the dopant M2, and the dopant M2 added accounts for 2.0wt% of the lithium manganese oxide powder;

[0060] In step (4), the uniformly mixed material is placed in a high-temperature furnace, heated to 750° C., kept for 8 hours, and then cooled with the furnace.

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Abstract

The invention discloses a high-density lithium manganate anode material and a preparation method thereof. The lithium manganate anode material comprises a dopant M1 and a dopant M2, wherein the dopant M1 is selected from at least one of TiO2, Sb2O5, Cr2O3, Al2O3, Co3O4 and rare earth oxide, and the molar ratio of Li:Mn:M1 in the lithium manganate anode material is (0.95-1.15):(1.85-2):(0.005-0.15); the dopant M2 is selected from at least two of V2O5, Nb2O5, CuO and ZnO, and the dopant M2 accounts for 0.05-3 wt% of the lithium manganate anode material in weight percent. In the invention, the solid-phase synthesis process which is simple and easy to control and has wide process range and low production cost is adopted; and the lithium manganate material has obviously increased volume specific capacity, excellent high-temperature performance and high safety and reliability.

Description

technical field [0001] The invention relates to a lithium manganate cathode material and a preparation method thereof, more specifically, the invention relates to a high-density lithium manganate cathode material and a preparation method thereof. Background technique [0002] Lithium batteries are a new generation of secondary batteries developed rapidly in the 1990s. Compared with nickel-metal hydride batteries and nickel-cadmium batteries, lithium-ion batteries have high operating voltage, large specific energy, long cycle life, low self-discharge rate, and no memory. Effect, the advantages of small environmental pollution. China is a major producer and exporter of lithium batteries in the world, and has maintained a momentum of overall growth in the export volume, export value and export unit price of various lithium batteries for several consecutive years. [0003] The performance of lithium batteries mainly depends on the structure and performance of the materials insi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 王登国冯森华胡博李树军
Owner GAOYAO CATHODE MATERIAL OF BATTERY
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