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A lithium-rich manganese-based material precursor and preparation method thereof, lithium-rich manganese-based positive electrode material and preparation method thereof, lithium battery

A lithium-rich manganese-based, cathode material technology, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve problems such as difficult removal, potential safety hazards of cathode materials, and complex processes, and achieve the effect of strong reactivity

Active Publication Date: 2021-04-06
桑德新能源技术开发有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The single crystal lithium-rich manganese-based positive electrode material prepared by this method can indeed improve the electrochemical performance of the material. However, an oxygen-enriched (higher oxygen concentration than air) atmosphere is required during the preparation process, and the calcination temperature is as high as 950-1200°C. The production cost is high, and the precursor needs to be pulverized and ball milled before calcination. The process is more complicated, and more importantly, the hardness of the carbonate precursor is low, and it is easy to be excessively pulverized to form fine slag during pulverization and ball milling. This kind of fine slag is not only small and irregular, but it is difficult to remove in actual production, and it will also leave a great safety hazard for the use of positive electrode materials.
Also, see figure 1 The SEM image of the single crystal lithium-rich manganese-based multi-component material prepared for this prior art, it is not difficult to see that the degree of single crystallization of the material prepared by this method is not high, and the electron microscope topography image obviously contains many fine particles <1 μm. These fine particles will also have many side reactions with the electrolyte, and there is a cohesive structure in the upper left corner of the figure (referred to as a single crystal in the industry), and the particle size is very uneven. Problems will affect and lead to the attenuation of battery performance

Method used

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  • A lithium-rich manganese-based material precursor and preparation method thereof, lithium-rich manganese-based positive electrode material and preparation method thereof, lithium battery
  • A lithium-rich manganese-based material precursor and preparation method thereof, lithium-rich manganese-based positive electrode material and preparation method thereof, lithium battery
  • A lithium-rich manganese-based material precursor and preparation method thereof, lithium-rich manganese-based positive electrode material and preparation method thereof, lithium battery

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Experimental program
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Embodiment 1

[0077] ① Preparation of mixed salt solution: MnSO 4 ·H 2 O, NiSO 4 ·6H 2 O and CoSO 4 ·7H 2 O was dissolved in deionized water to prepare a mixed salt solution with a total ion concentration of 2 mol / L.

[0078] ② Precipitating agent preparation: prepare an aqueous solution containing 2mol / L sodium carbonate;

[0079] ③ Prepare complexing agent: prepare ammonia water as complexing agent, the concentration ratio of ammonia water and sodium carbonate is 0.05.

[0080]④ Carbonate co-precipitation reaction: Add the mixed salt solution, precipitant, and complexing agent prepared in steps ① to ③ into the continuous stirred tank reactor at the same time through the peristaltic pump, the feeding rate is 5mL / min, and the reaction temperature is 50°C. The pH was controlled at 8.0, the stirring speed was 500rpm / min, and after the feeding was completed, the reaction was continued at a reaction temperature of 50°C for 2h, aged for 10h, washed with deionized water for 5 times, suction...

Embodiment 2

[0085] The difference between this embodiment and embodiment 1 is only in step 5 without adding any additives, and the operation is as follows:

[0086] According to lithium and step ①, the total molar ratio of metal ions in the mixed salt solution is 1.25:0.8, weigh lithium carbonate, dry ball mill and mix evenly. Lithium carbonate is added in excess of 0.05wt% (that is, added weighed amount*1.05wt%) to make up for the loss of lithium during high-temperature sintering.

[0087] Put the homogeneously mixed precursor and lithium carbonate mixture in a sagger, place it in a muffle furnace, pass in dry air, raise the temperature to 450°C at a rate of 3.5°C / min, sinter for 4h, and continue to heat up to 900°C. Sintered for 15 hours, cooled naturally, crushed, dissociated, and sieved to obtain a lithium-rich manganese-like cathode material Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 .

[0088] Observed by electron microscope, the grain shape can be seen in Figure 3b SEM image. Depe...

Embodiment 3

[0091] ① Preparation of mixed salt solution: MnSO 4 ·H 2 O, NiSO 4 ·6H 2 O and CoSO 4 ·7H 2 O was dissolved in deionized water to prepare a mixed salt solution with a total ion concentration of 3.5 mol / L.

[0092] ② Preparation of precipitant: preparation of an aqueous solution containing 3.5mol / L sodium carbonate;

[0093] ③ Prepare complexing agent: prepare ammonia water as complexing agent, the concentration ratio of ammonia water and sodium carbonate is 0.5.

[0094] ④ Carbonate co-precipitation reaction: Add the mixed salt solution, precipitant, and complexing agent prepared in steps ① to ③ into the continuous stirred tank reactor at the same time through the peristaltic pump, the feeding rate is 15mL / min, and the reaction temperature is 65°C. The pH is controlled at 8.5, the stirring speed is 1000rpm / min, after the feeding is completed, the reaction is continued at 65°C for 2h, aged for 5h, washed with deionized water for 5 times, suction filtered, dried in an oven...

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Abstract

The invention relates to a lithium-rich manganese-based material precursor, the lithium-rich manganese-based material precursor is a sheet-like lithium-rich manganese-based material carbonate precursor with a particle size of 1-7 μm and a specific surface area of 8~50m 2 / g. The lithium-rich manganese-based material carbonate precursor with sheet-like morphology is easy to prepare a lithium-rich manganese-based positive electrode material with a high degree of single crystallization. The present invention also relates to the preparation method of the lithium-rich manganese-based material carbonate precursor with sheet-like morphology, and the preparation method and application of the lithium-rich manganese-based positive electrode material with single crystal morphology. Therefore, the mechanical strength, stability and compaction density of the microstructure of the positive electrode material are improved, the capacity, the first efficiency and the voltage decay are suppressed.

Description

technical field [0001] The invention relates to the technical field of lithium battery materials, in particular to a lithium-rich manganese-based material precursor, its preparation method and application. Background technique [0002] In recent years, the field of use of lithium-ion batteries has been continuously expanding. From traditional 3C products to current electric vehicles and smart grids, the demand for lithium-ion batteries, especially high-energy-density lithium batteries, in the new energy industry is becoming more and more urgent. To meet this demand, a great deal of research effort has been devoted to finding and developing electrode materials with high specific capacity. Lithium-rich manganese-based cathode material aLi 2 MnO 3 ·(1-a)LiMO 2 [0<a<1, M=one or more of Ni, Co, Mn, Al, V, Cr, Fe] The discharge specific capacity exceeds 250mAh / g, and the working voltage is greater than 3.50V, because of its high specific capacity , good thermal stability...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/00H01M4/36H01M4/505H01M4/525H01M10/0525
CPCC01G53/006C01P2002/72C01P2004/04C01P2004/61C01P2006/12H01M4/362H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 张鹏陈橙苗力孝王伟刚
Owner 桑德新能源技术开发有限公司
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