Positive electrode active material for lithium secondary battery, preparation method thereof, and lithium secondary battery

A positive electrode active material, lithium secondary battery technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of life characteristics decline, lithium secondary battery life characteristics, poor thermal stability and reliability, etc., and achieve expansion characteristics Improvement, high temperature and room temperature life characteristics improvement, thermal stability improvement effect

Active Publication Date: 2020-08-07
权镐真
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the performance is evaluated by increasing the charging voltage of the positive electrode active material, the higher the charging voltage, the higher the discharge capacity, but on the contrary, the phenomenon of sharp decline in life characteristics appears, and the higher the charging voltage, the lower the thermal stability (Thermal stability) Stability: the characteristics directly related to the stability of the battery) the worse
And, compared with room temperature, the above phenomenon is more serious at high temperature
That is, if a lithium secondary battery that is charged at a high voltage by increasing the charging voltage is used, the higher the charging voltage, the better the life characteristics, thermal stability, reliability, etc. of the lithium secondary battery at high temperatures than at normal temperature. Difference

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  • Positive electrode active material for lithium secondary battery, preparation method thereof, and lithium secondary battery
  • Positive electrode active material for lithium secondary battery, preparation method thereof, and lithium secondary battery
  • Positive electrode active material for lithium secondary battery, preparation method thereof, and lithium secondary battery

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preparation example Construction

[0061] Moreover, the present invention provides a method for preparing a positive electrode active material for a lithium secondary battery. The method for preparing a positive electrode active material for a lithium secondary battery includes: step a, preparing a lithium-containing compound; step b, preparing a compound selected from Al(OH) 3 solution, a surface treatment solution of two or more solutions in the group consisting of a B-containing compound solution and a Si-containing compound solution; and step c, adding the lithium-containing compound prepared in the above step a to the lithium-containing compound prepared in the above step b After the surface treatment solution is mixed and dried.

[0062] First, in order to prepare a positive electrode active material for a lithium secondary battery, a lithium-containing compound is prepared (step a). The above-mentioned lithium-containing compound has been explained as above.

[0063] Next, in order to prepare a positive...

Embodiment 1

[0078] Under the condition of Li / Me(=Ni+Co+Mn)=1.03~1.05, mix Ni 0.5 co 0.2 mn 0.3 (OH) 2 Precursor (manufacturer: Bangpu) and Li 2 CO 3 (Manufacturer: Lockwood) After that, Li x Ni 0.5 co 0.2 mn 0.3 o 2 . When using a winnowing machine to crush Li x Ni 0.5 co 0.2 mn 0.3 o 2 Thereafter, lithium-containing compound L-1 was prepared by filtering (sieve) through 400 mesh.

[0079] In the separate preparation of Al(OH) 3 Aqueous solution (manufacturer: Snow Chemicals, China) (Al(OH) 3 Concentration (w / w) = 1000ppm), B 2 o 3 Aqueous solution (manufacturer: pure chemical) (B 2 o 3 Concentration (w / w) = 300ppm) and n-SiO 2 Aqueous solution (manufacturer: Aladdin) (n-SiO 2 After concentration (w / w) = 500 ppm), the above-mentioned ingredients were mixed in the same weight ratio to prepare a surface treatment solution S-1.

[0080] After that, use figure 1 The shown device slowly adds the lithium-containing compound L-1 to the surface treatment solution S-1 and s...

Embodiment 2

[0083] In the separate preparation of Al(OH) 3 Aqueous solution (manufacturer: Snow Chemicals, China) (Al(OH) 3 Concentration (w / w) = 1000ppm), B 2 o 3 Aqueous solution (manufacturer: pure chemical) (B 2 o 3 Concentration (w / w) = 500ppm) and n-SiO 2 Aqueous solution (manufacturer: Aladdin) (n-SiO 2 After concentration (w / w) = 300 ppm), the above-mentioned ingredients were mixed in the same weight ratio to prepare a surface treatment solution S-2.

[0084] Afterwards, using the figure 1 The shown device slowly adds the lithium-containing compound L-1 to the surface treatment solution S-2 and stirs until the weight ratio of the surface treatment solution S-2 and the lithium-containing compound L-1 is 1:2, after the addition is completed , and additional stirring was performed for about 1 hour. Thereafter, mixing and drying were performed at a temperature of 100° C. for 4 to 6 hours. Thereafter, after performing an additional heat treatment at a temperature of 300° C. fo...

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Abstract

The invention relates to a positive active material for a lithium secondary battery, a preparation method thereof, and the lithium secondary battery, wherein the positive active material includes a lithium containing compound; a surface process layer formed on the lithium containing compound; the surface process layer includes, freely, more than two selected from Al(OH)3, a boron-containing compound, and a silicon-containing compound.

Description

technical field [0001] The invention relates to a cathode active material for a lithium secondary battery, a preparation method thereof, and a lithium secondary battery containing the same. Background technique [0002] In the fields of IT, electric vehicles, and energy storage devices, lithium secondary batteries are currently the most attractive energy devices. Since Sony first commercialized lithium secondary batteries in 1990, it has achieved remarkable development in the past 25 years. The initial field of application was limited to mobile devices such as notebook computers, but it is now applicable not only to electric vehicles, but also to large-scale energy storage devices. In particular, with emphasis on environmental protection and efficiency, the fields of application of lithium secondary batteries have been expanded to electric vehicles and energy storage devices as new industrial fields, and the fields of application are rapidly expanding. [0003] Lithium sec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/38H01M4/48H01M10/0525
CPCH01M4/366H01M4/386H01M4/483H01M4/58H01M10/0525Y02E60/10
Inventor 权镐真
Owner 权镐真
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