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High-tap-density lithium-rich manganese-based positive electrode material and preparation method therefor

A positive electrode material and system technology, which is applied in the field of high tap density lithium-rich manganese-based positive electrode materials and its preparation, can solve the problems of low porosity, low tap density, and poor rate performance, and achieve low porosity and high tap density , Excellent electrochemical performance and processing performance

Active Publication Date: 2016-11-16
CHENGDU SCI & TECH DEV CENT CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of low tap density and poor rate performance in existing lithium-rich manganese-based positive electrode materials, and provide a high-tap density lithium-rich manganese-based positive electrode material and a preparation method thereof; the lithium-rich manganese-based positive electrode material Low porosity, high tap density and excellent electrochemical performance and processing performance, thereby increasing the compaction density of the corresponding battery pole piece, reducing the cost of battery preparation, and improving the volumetric energy density of the battery; this method does not need to add complexing agent (ammonia) And nitrogen protection, the precursor of secondary particles composed of micron-sized spherical primary particles and wide particle size distribution is prepared directly by co-precipitation method, and then mixed with lithium-containing compounds to prepare primary particles closely packed The secondary particles of the lithium-rich manganese-based cathode material, the preparation method of the invention is simple and reliable, and is suitable for large-scale and commercial production of high-tap density lithium-rich manganese-based cathode materials

Method used

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  • High-tap-density lithium-rich manganese-based positive electrode material and preparation method therefor
  • High-tap-density lithium-rich manganese-based positive electrode material and preparation method therefor
  • High-tap-density lithium-rich manganese-based positive electrode material and preparation method therefor

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Embodiment 1

[0030] Under air atmosphere, 2.0mol / L MSO 4 (M=Mn, Ni, Co, where Mn:Ni:Co molar ratio is 0.54:0.13:0.13) solution and 5.0mol / L NaOH solution were added dropwise to the reaction vessel at a rate of 0.5ml / min to control the pH value is 10.0, and the co-precipitation reaction temperature is controlled at 50°C. After the reaction, washing and drying are carried out to obtain the precursor of secondary particles composed of micron-sized spherical primary particles with a wide particle size distribution ( figure 2 A and b are the XRD pattern of the prepared precursor), and the dried precursor was mixed with LiOH·H 2 O mixed evenly, then placed in a tube furnace, heated at 3°C / min to 500°C and then held for 6 hours, then raised to 900°C at 3°C / min and held for 15 hours to obtain a manganese-based lithium-rich positive electrode with high tap density Material( figure 1 I-OLO is the XRD pattern of the prepared cathode material, image 3 A and b are the SEM images of the prepared po...

Embodiment 2

[0032] Under air atmosphere, 1.5mol / L MNO 3 (M=Mn, Ni, Co, where Mn:Ni:Co molar ratio is 0.5:0.2:0.1) solution and 5.0mol / L NaOH solution were added dropwise to the reaction vessel at a rate of 0.5ml / min to control the pH value is 10.0, and the co-precipitation reaction temperature is controlled to be 30°C. After the reaction, washing and drying are carried out to obtain a precursor of secondary particles composed of micron-sized spherical primary particles and a wide particle size distribution. The dried precursor with Li 2 CO 3 Mix evenly, then place in a tube furnace, raise the temperature at 3°C / min to 600°C and keep it for 5 hours, then raise the temperature to 900°C at 5°C / min and keep it for 15 hours to obtain a manganese-based lithium-rich cathode material with high tap density , assembled into a CR2032 button battery with this material, and tested the electrochemical performance.

Embodiment 3

[0034] Under air atmosphere, 2.5mol / L MSO 4 (M=Mn, Ni, where the molar ratio of Mn:Ni is 0.6:0.2) solution and 2mol / L KOH solution were added dropwise to the reaction vessel at a rate of 0.2ml / min, and the pH value was controlled to be 10.0 to control the co-precipitation reaction The temperature is 60°C. After the reaction, washing and drying are carried out to obtain the precursor of secondary particles composed of micron-sized spherical primary particles and with a wide particle size distribution. The dried precursor is mixed with LiNO 3 Mix evenly, then place in a tube furnace, raise the temperature at 5°C / min to 600°C and keep it for 4 hours, then raise the temperature to 850°C at 3°C / min and keep it for 18 hours to obtain a manganese-based lithium-rich cathode material with high tap density , assembled into a CR2032 button battery with this material, and tested the electrochemical performance.

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Abstract

The invention discloses a high-tap-density lithium-rich manganese-based positive electrode material and a preparation method therefor. The positive electrode material is prepared by two steps of precursor preparing, and mixing and calcining. The positive electrode material has relatively high tap density and relatively excellent electrochemical performance; according to the preparation method for the positive electrode material, nitrogen atmosphere protection and ammonium hydroxide which can be used as a complexing agent are not required; instead, the secondary particle precursor which comprises micron-level sphere-like primary particles and has relatively wide particle size distribution is prepared by a coprecipitation method directly; and then the secondary particle precursor and a lithium-containing compound are mixed and calcined to obtain the positive electrode material. The lithium-rich manganese-based positive electrode material is simple and reliable in preparation method and process, and suitable for large-scale and commercial production.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a lithium-rich manganese-based positive electrode material with high tap density and a preparation method thereof. Background technique [0002] Lithium-ion batteries have gradually become the most important secondary electrochemical batteries due to their high energy density, better safety performance and lower cost. At present, lithium-ion batteries have not only been successfully used in mobile devices such as mobile phones and tablet computers, but also in hybrid electric vehicles and pure electric vehicles. However, in the field of pure electric vehicle applications, it is still necessary to further increase the energy density of lithium-ion batteries, so as to increase the cruising range of pure electric vehicles. Since the cathode material provides the lithium source in the lithium-ion battery, the performance of the cathode material p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/364H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 刘国标周宇环刘昊梅军
Owner CHENGDU SCI & TECH DEV CENT CHINA ACAD OF ENG PHYSICS
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