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Positive electrode active material and lithium secondary battery including the same

A cathode active material, secondary particle technology, applied in secondary batteries, lithium storage batteries, active material electrodes, etc., can solve the problems of reducing cycle, difficult synthesis, battery expansion, etc., to improve life and stability, reduce part Strain, the effect of reducing strain

Pending Publication Date: 2021-02-23
ECOPRO BM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Among the above cathode active materials, although LiCoO with excellent lifetime characteristics and charge-discharge efficiency is widely used 2 , but the above-mentioned materials are limited in terms of price competitiveness due to limited resources of cobalt used as raw materials and high prices
[0006] LiMnO 2 、LiMN 2 o 4 Although lithium manganese oxide has the advantages of good thermal stability and low price, it has problems such as small capacity and poor high temperature characteristics.
In addition, LiNiO 2 Although the positive electrode active material has battery characteristics of high discharge capacity, it is very difficult to synthesize due to the problem of cation mixing between Li and transition metals, and there is a big problem in rate characteristics.
[0007] In addition, according to the deepening degree of the above-mentioned cation mixing, a large amount of Li by-products are produced, and because most of the Li by-products are composed of LiOH and Li 2 CO 3 The composition of the compound has the problem of gelation during the production of the positive electrode slurry and the production of gas with the progress of charge and discharge after the production of the electrode.
Residual Li 2 CO 3 By increasing the swelling phenomenon of the battery, it not only reduces the cycle, but also causes the swelling of the battery

Method used

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  • Positive electrode active material and lithium secondary battery including the same
  • Positive electrode active material and lithium secondary battery including the same
  • Positive electrode active material and lithium secondary battery including the same

Examples

Experimental program
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experiment example 1

[0149] (1) Preparation of cathode active material

Embodiment 1

[0151] Synthesis of spherical Ni by co-precipitation method 0.92 Co 0.08 (OH)2 hydroxide precursor. In a 90L-level reactor, a 1.5M concentration of metal aqueous solution was continuously fed into the reactor at a rate of 3.0kg / hr, and a 30 wt% concentration of ammonia solution was continuously fed into the reactor at a rate of 0.2kg / hr for 20- For 40 hours, the above metal aqueous solution was passed through the NiSO 4 ·7H 2 O and CoSO 4 ·7H 2 O was mixed in a molar ratio of 92:8. In addition, in order to maintain the pH in the reactor at 11.5, a 20% by weight aqueous sodium hydroxide solution was supplied at a rate of 2 kg / hr. The reactor temperature at this time was kept at 60°C, and N as an inert gas was 2 put into the reactor to prevent oxidation of the prepared precursor. After the synthesis stirring, washing and dehydration were carried out using a filter press (F / P) equipment to obtain Ni 0.92 Co 0.08 (OH) 2 Hydroxide precursor.

[0152] Using a mixer to mi...

Embodiment 2

[0154] The positive electrode active material obtained in Example 1 was mixed with the W-containing raw material material (WO 3 ) mixed and then kept O in the same calciner 2 atmosphere and increase the temperature by 2°C per minute, hold for 5 hours at a heat treatment temperature of 600°C, and then naturally cool. Next, heat treatment and cooling were further performed once under the same conditions as above. It can be confirmed that the positive electrode active material prepared in Example 2 has Li 1.010 Ni 0.903 Co 0.078 Al 0.014 W 0.005 O 2 composition. The cross-sectional SEM image of the above-mentioned positive electrode active material is shown in Figure 5 middle.

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Abstract

The present invention relates to a positive electrode active material and a lithium secondary battery comprising the same, in which primary particles included in secondary particles have an aspect ratio gradient in which the aspect ratio gradually increases from the center of the secondary particles toward the surface of the secondary particles.

Description

technical field [0001] The present invention relates to a positive electrode active material and a lithium secondary battery using a positive electrode including the above positive electrode active material, wherein primary particles included in the secondary particles exhibit an aspect ratio from the center portion of the secondary particle toward the surface of the secondary particle A gradually increasing aspect ratio gradient at the top. Background technique [0002] Batteries store electricity using substances that can electrochemically react at the positive and negative electrodes. A representative example of such a battery is a lithium secondary battery that stores electrical energy by changes in chemical potential during intercalation / deintercalation of lithium ions of the positive and negative electrodes. [0003] The above-mentioned lithium secondary battery is fabricated by using a material that reversibly intercalates or deintercalates lithium ions as a positive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M10/0525H01M2004/028C01G53/42C01P2004/03Y02E60/10H01M4/366H01M4/62H01M10/052
Inventor 崔文豪许京宰庾炫钟崔胜铉千裕敬
Owner ECOPRO BM CO LTD