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Single crystal lithium-rich manganese-based anode material, preparation method thereof, lithium ion battery

A lithium-rich manganese-based, positive electrode material technology, applied in the direction of battery electrodes, secondary batteries, circuits, etc., can solve the problems of low single crystallization degree of materials, uneven particle size, battery performance attenuation, etc., to achieve good power The effects of chemical properties, increased hardness, and reduced melting point

Inactive Publication Date: 2018-09-28
桑德新能源技术开发有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method needs to be carried out in an oxygen-enriched atmosphere, the production cost is high, and during the 16-26h calcination period, there is no interference such as breaking the calcined object, resulting in a certain degree of agglomeration during the high-temperature sintering process Phenomenon
See figure 1 , the SEM image of the single-crystal lithium-rich manganese-based multi-element cathode material prepared by this existing scheme, it is not difficult to see that the degree of single crystallization of the material prepared by this method is not high, and there are obviously many fine particles <1um in the electron microscope topography image Particles, 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 (often referred to as a single crystal in the industry), and the particle size is also very large. Uneven, these problems will affect and lead to the attenuation of battery performance

Method used

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  • Single crystal lithium-rich manganese-based anode material, preparation method thereof, lithium ion battery
  • Single crystal lithium-rich manganese-based anode material, preparation method thereof, lithium ion battery
  • Single crystal lithium-rich manganese-based anode material, preparation method thereof, lithium ion battery

Examples

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Effect test

Embodiment 1

[0069] ① Prepare a mixed salt solution of nickel sulfate, cobalt sulfate, and manganese sulfate with a molar ratio of Mn, Co, and Ni at 4:1:1, and the total metal ion concentration is 2moL / L.

[0070] ②Prepare a mixed solution of sodium hydroxide and ammonia, the concentration of sodium hydroxide is 2mol / L, and the concentration of ammonia is 3mol / L.

[0071] ③Add 25% by volume of deionized water in the reactor to the reactor, and pass the mixed solution of sodium hydroxide and ammonia into the reactor under the protection of an inert atmosphere such as nitrogen, and control the inlet flow rate of the metal salt solution to 0.5L / h. Adjust the flow rate of the mixed solution of sodium hydroxide and ammonia so that the pH of the system is maintained at 10.2, the process control reaction temperature is 55 degrees, the stirring speed is 600 rpm / min, after the feeding, continue to stir and age for 10 hours, and then filter the precipitated product , Washing, drying, sieving through a 4...

Embodiment 2

[0076] ① Prepare a mixed salt solution of nickel sulfate, cobalt sulfate, and manganese sulfate with a molar ratio of Mn, Co, and Ni at 4:1:1, and the total metal ion concentration is 2moL / L.

[0077] ②Prepare a mixed solution of sodium hydroxide and ammonia, the concentration of sodium hydroxide is 2mol / L, and the concentration of ammonia is 3mol / L.

[0078] ③Add 25% by volume of deionized water in the reactor to the reactor, and pass the mixed solution of sodium hydroxide and ammonia into the reactor under the protection of an inert atmosphere such as nitrogen, and control the inlet flow rate of the metal salt solution to 0.5L / h. Adjust the flow rate of the mixed solution of sodium hydroxide and ammonia so that the pH of the system is maintained at 10.2, the process control reaction temperature is 55 degrees, the stirring speed is 600 rpm / min, after the feeding, continue to stir and age for 10 hours, and then filter the precipitated product , Washing, drying, sieving through a 4...

Embodiment 3

[0083] The difference between this example and Example 2 is only in the additives mixed in step ④. The additives are titanium oxide and boron oxide. The operation is as follows: the precursor obtained by co-precipitation in step ③ is calcined at 520°C for 8 hours, then cooled, After crushing and dispersing, it is passed through a 300-mesh sieve to obtain the oxide of the lithium-rich manganese-based material precursor with a smaller particle size (about 0.3um-6um), and then 100g of the precursor oxide and 0.5g of nano-TiO 2 , 0.2g B 2 O 3 And 71.4g of lithium carbonate (molar ratio Li / Me=1.2 / 0.8, Me is the molar sum of metal ions in the mixed salt solution) after mixing in a high-mixer, sintering at 920℃ for 12h, after crushing 400 mesh sieve, 0.5Li with single crystal morphology 2 MnO 3 ·0.5LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 Lithium-rich manganese-based cathode material, observed with an electron microscope, its crystal grain shape is figure 2 very close.

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Abstract

The invention relates to a preparation method of a single crystal lithium-rich manganese-based anode material. In the process of preparing a single crystal lithium-rich manganese-based anode materialby calcining a lithium-rich manganese-based material precursor, the method comprises the following steps: S1, firstly, pre-sintering the lithium-rich manganese-based material precursor, and carrying out crushing treatment to obtain scattered oxide of the lithium-rich manganese-based material precursor; S2, uniformly mixing the oxide of the lithium-rich manganese-based material precursor with a lithium source and then sintering to obtain the oxide of the lithium-rich manganese-based material precursor. More preferably, a small amount of additive is mixed while mixing lithium after pre-sinteringand crushing; and the mixed additive may induce crystal growth and grain boundary fusion, which is favorable for forming a single crystal and improving the structure of the crystal; pre-sintering andcrushing can reduce the particle diameter to a relatively desirable range, so that the sintered body has better kinetic performance and achieves better mixing uniformity when mixing lithium and mixing the additive, to promote the formation of the single crystal. By means of such a preparation method, a lithium-rich manganese-based anode material having a high degree of single crystallization anda uniform particle diameter can be obtained.

Description

Technical field [0001] The invention relates to the technical field of lithium battery materials, in particular to a preparation method and application of a single crystal lithium-rich manganese-based positive electrode material. Background technique [0002] Compared with other secondary batteries, lithium-ion batteries have the advantages of higher energy density, higher working voltage, good cycle performance, and environmental friendliness. They are widely used in portable power banks, energy storage base stations, electric vehicles and other fields. The development demand for light weight and long battery life puts forward an urgent need for the improvement of battery energy density. The capacity of the cathode material is one of the most important factors that affect the energy density of the battery. The current commercial cathode materials for lithium-ion batteries include lithium cobalt oxide (LCO), ternary materials (NCM, NCA), and lithium manganate (LMO) , Lithium iro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M10/0525
CPCH01M4/485H01M4/505H01M10/0525Y02E60/10
Inventor 陈橙张鹏苗力孝
Owner 桑德新能源技术开发有限公司
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