Composite negative electrode material for lithium metal battery

A technology for lithium metal batteries and negative electrode materials, applied in battery electrodes, lithium batteries, nitrogen-metal/silicon/boron binary compounds, etc. Problems such as the energy density of the metal negative electrode and the inability to realize the interaction of lithium ions better

Inactive Publication Date: 2021-10-15
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not consider that the larger pores between the random particles may not be able to achieve better interaction with lithium ions. In addition, the random high-density particles will reduce the energy density of the lithium metal negative electrode.
[0008] Therefore, the effective distance of the interaction force between nitrogen atoms and lithium ions is not considered in the above design, that is to say, only when the flow channels provided by lithium-friendly materials are small (nano-scale), nitrogen atoms and lithium ions will produce a stronger interaction. Interaction
In addition, most of the nitrogen-containing functional group materials currently prepared contain low nitrogen content, and the composite method with lithium metal is complicated.

Method used

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  • Composite negative electrode material for lithium metal battery
  • Composite negative electrode material for lithium metal battery
  • Composite negative electrode material for lithium metal battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 1) 7.92mmol melamine was dissolved in 40mL dimethyl sulfoxide (DMSO) (Aladdin, Pur≥99.0%); 7.92mmol cyanuric acid (Aladdin, Pur≥99.0%) was dissolved in 20mL DMSO;

[0052] 2) The two solutions were heated to 60°C, stirred and mixed for about 15 minutes, and filtered;

[0053] 3) wash the filtrate several times with ethanol and deionized water respectively, and dry at 80°C;

[0054] 4) Dry the obtained white powder under argon at 550°C at 2°C min -1 The heating rate was calcined for 4 hours. In addition, a small amount of oxygen (0.1%-2%) was introduced during the calcining process, and finally, yellow porous carbon nitride microsphere powder was obtained;

[0055] 5) Mix the prepared porous carbon nitride microsphere powder with polyvinylidene fluoride (PVDF) in a 1-methyl-2-pyrrolidone (NMP) solvent at a mass ratio of 1:1, and stir for 10 hours to form a stable and uniform The massfraction of the total material is the slurry of 10wt%;

[0056] 6) Coating the slurry ...

Embodiment 2

[0064] The preparation method is the same as in Example 1, the only difference being that the concentration of the slurry is 5%, a composite electrode is obtained, and the performance of the detection electrode is specifically as follows:

[0065] Image 6 It is the SEM photo of the composite electrode obtained by coating with different slurry concentrations, the left picture is the SEM photo of the 5% composite electrode, and the right picture is the SEM photo of the 10% composite electrode; Figure 7 The coulombic efficiency graph of the electrode obtained by coating under different slurry concentrations (PCNM+PVDF) in the lithium-copper half-cell test; Image 6 It can be seen that the slurry with a concentration of 5% is too diluted, the coated pole piece is very uneven, the surface presents a pitted structure, and there is obvious copper exposure, which is not conducive to the impact of carbon nitride microspheres on copper foil. / lithium foil for protection ( Image 6 ...

Embodiment 3

[0067] The preparation method is the same as that of Example 1, the only difference is that the thickness of the slurry is 100 μm, a composite electrode is obtained, and the performance of the electrode is tested, and the results are as follows:

[0068] As a result, it was found that the cross-section and surface of the electrode sheet obtained by the coating thickness of 100 μm were not smooth enough, and there was obvious copper exposure ( Figure 8 (a-b)); while the cross-section and surface of the electrode sheet obtained with a coating thickness of 200 μm are unconventional and uniform, and there is no obvious copper exposure ( Figure 8 (c-d)). from Figure 9 It can also be found that the coulombic efficiency of the electrode sheet with a coating thickness of 200 μm is better than that of the electrode sheet with a coating thickness of 100 μm.

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Abstract

The invention provides a composite negative electrode material for a lithium metal battery, the composite negative electrode material is composed of a negative electrode material and a buffer layer coated on the surface of the negative electrode material, and the buffer layer is prepared from slurry containing porous carbon nitride microspheres. According to the invention, porous carbon nitride microspheres are mainly coated on the surface of a negative electrode material to form an inorganic buffer layer with hierarchical pores; the buffer layer can provide a physical space for accommodating and guiding lithium deposition by means of the accumulation macropores; and meanwhile, due to the existence of abundant nanopores, the nanopores can fully interact with lithium ions, so that a better homogenization effect on lithium ion flow is realized.

Description

technical field [0001] The invention relates to the technical field of lithium metal batteries, in particular to a composite negative electrode material for lithium metal batteries. Background technique [0002] With the increasing popularity of portable electronic devices and electric vehicles, the energy density of conventional Li-ion batteries has been challenged. Lithium metal due to the low weight density (0.53g / cm 3 ), low redox potential (-3.04V vs standard hydrogen electrode), and high theoretical specific capacity (3860mAh / g), it is considered to be the most promising anode material for high energy density batteries. At the same time, lithium metal anodes are also considered as key components of next-generation energy storage systems such as lithium-oxygen or lithium-sulfur batteries. [0003] However, the practical application of lithium metal secondary batteries has been severely hindered, mainly due to the physical / chemical problems of lithium metal anodes duri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M10/052C01B21/06
CPCH01M4/62H01M4/382H01M4/38H01M10/052C01B21/0605C01P2004/03C01P2004/04Y02E60/10
Inventor 郭强周旭峰刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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