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High-stability scandium oxide coated positive electrode material of manganese-based lithium ion battery and preparation method of positive electrode material

A technology for coating manganese-based lithium and lithium-ion batteries, which is applied in battery electrodes, secondary batteries, circuits, etc. problems, to achieve good cycle performance, reduce lithium ion consumption, and reduce the effect of interface resistance

Inactive Publication Date: 2016-11-16
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The lithium cobalt oxide material, which was first used in industrial production, has relatively stable electrochemical properties, good electrical conductivity, and good cycle performance, especially the compacted density can reach 4.0g / cm 3 , but its overcharge safety performance is poor
Although lithium manganese oxide has a high specific capacity, its structural stability is poor. Nickel-doped lithium manganate has a high energy density due to its high voltage platform, but its cycle performance at high temperatures is poor.
Ternary materials have the advantages of good thermal stability and high energy density, but poor cycle performance, compaction density, safety performance, etc.
Spinel LiNi 0.5 mn 1.5 o 4 and LiMn 2 o 4 materials, because the metal elements in manganese-based materials, especially Mn ions, are easy to dissolve and deposit on the surface of the negative electrode, which prevents the rapid diffusion of lithium ions and causes the battery to decay rapidly during the cycle.

Method used

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  • High-stability scandium oxide coated positive electrode material of manganese-based lithium ion battery and preparation method of positive electrode material
  • High-stability scandium oxide coated positive electrode material of manganese-based lithium ion battery and preparation method of positive electrode material
  • High-stability scandium oxide coated positive electrode material of manganese-based lithium ion battery and preparation method of positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Mass fraction 0.5% Sc 2 o 3 Preparation of coated lithium nickel manganese oxide

[0026] 2.09g LiCH 3 COO·2H 2 O, 2.13g Ni(CH 3 COO) 2 2H 2 O, 7.35g Mn(CH 3 COO) 2 4H 2 O was dissolved in 200mL deionized water, and 1.8g of oxalic acid was dissolved in 200mL deionized water to form an oxalic acid solution. The metal salt solution was quickly poured into the oxalic acid solution for 6 hours of stirring, and then evaporated at 80°C for 10 hours to obtain the precursor precipitation. Precipitate the precursor in the air at 900°C for 12h, and anneal at 700°C for 18h to obtain LiNi 0.5 mn 1.5 o 4 matrix. Weigh 0.09g Sc(NO 3 ) 3 ·6H 2 O was dissolved in 10 mL of deionized water to prepare scandium nitrate solution, LiNi 0.5 mn 1.5 o 4 Disperse the matrix powder into scandium nitrate solution, stir at room temperature for 0.5h with a magnetic stirrer, dry at 80°C for 10h, and then heat-treat at 600°C for 3h to obtain the target high-performance Sc 2 o 3 Co...

Embodiment 2

[0029] Mass fraction 1% Sc 2 o 3 Coated lithium-rich layered lithium-ion battery cathode material Li 1.2 Ni 0.25 mn 0.75 o 2 preparation of

[0030] 2.52g LiCH 3 COO·2H 2 O, 1.06g Ni(CH 3 COO) 2 2H 2 O, 3.67g Mn(CH 3 COO) 2 4H 2 O was dissolved in 200 mL of deionized water, and 1.98 g of oxalic acid was dissolved in 100 mL of deionized water to form an oxalic acid solution. The metal salt solution was quickly poured into the oxalic acid solution for 6 hours of stirring, and then evaporated at 80°C for 10 hours to obtain the precursor precipitation. The precursor was calcined at 820 °C for 18 h in air to prepare the lithium-rich layered material Li1.2 Ni 0.25 mn 0.75 o 2 matrix. Weigh 0.09g Sc(NO 3 ) 3 ·6H 2 O was dissolved in 10 mL of deionized water to prepare scandium nitrate solution, and Li 1.2 Ni 0.25 mn 0.75 o 2 The matrix powder was dispersed into scandium nitrate solution, stirred at room temperature for 0.5 h with a magnetic stirrer, dried at 9...

Embodiment 3

[0033] Mass fraction 2% Sc 2 o 3 Coated ternary material LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 preparation of

[0034] 2.09g LiCH 3 COO·2H 2 O, 1.4g Ni(CH 3 COO) 2 2H 2 O, 1.62g Mn(CH 3 COO) 2 4H 2 O, 1.41g Co(CH 3 COO) 2 4H 2 O was dissolved in 200 mL of deionized water, and 2.7 g of oxalic acid was dissolved in 100 mL of deionized water to form an oxalic acid solution. The metal salt solution was quickly poured into the oxalic acid solution for 6 hours of stirring, and then evaporated at 80°C for 10 hours to obtain the precursor precipitation. The precursor was calcined at 850 °C for 20 h in the air to prepare the ternary material LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 matrix. Weigh 0.19g Sc(NO 3 ) 3 ·6H 2 O was dissolved in 10 mL of deionized water to prepare scandium nitrate solution, LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Disperse the matrix powder into scandium nitrate solution, stir at room temperature for 0.5h with a magnetic stirrer, dry at 100°C for 9h, and then heat-treat ...

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Abstract

The invention discloses a metal oxide coated positive electrode material of a manganese-based lithium ion battery and a preparation method of the positive electrode material. The preparation method comprises the following steps of weighing corresponding acetate of a metal element according to a ratio of substances corresponding to the metal element of the positive electrode material of the manganese-based lithium ion battery, adding an oxalic acid precipitant during stirring at a room temperature to obtain an oxalate precursor, and sintering the oxalate precursor to obtain the positive electrode material; weighing Sc(NO<3>)<3>.6H<2>O, dispersing positive electrode material powder in a scandium nitrate solution, stirring and drying the solution to obtain a precursor of a Sc<2>O<3> coated positive electrode material of the lithium ion battery; and performing thermal processing on the precursor of the Sc<2>O<3> coated positive electrode material of the lithium ion battery to obtain the Sc<2>O<3> coated positive electrode material of the manganese-based lithium ion battery. By the preparation method, the corrosion of an electrolyte to the positive electrode material is reduced, and higher cycle performance is achieved; moreover, a compact and uniform coating layer is formed on a surface of an active material, the consumption of lithium ions is reduced, and the capacity and the rate performance are improved.

Description

technical field [0001] The invention belongs to the field of positive electrode materials of lithium ion batteries, and relates to a highly stable scandium oxide-coated manganese-based lithium ion battery positive electrode material and a preparation method. Background technique [0002] At present, the global energy problem is becoming more and more prominent. Governments of various countries actively promote the development of new energy vehicles mainly electric vehicles from the strategic height of improving the competitiveness of the national automobile industry in the future and maintaining sustainable economic and social development. The power battery system is an important part of electric vehicles, which directly affects the performance of electric vehicles such as starting, acceleration, and mileage. Therefore, lithium-ion batteries are receiving widespread attention as power energy batteries. With continuous development, lithium-ion batteries are required to have h...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/483H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 杨立铭樊少娟汪涛
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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