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Cathode materials and applications for improving the interfacial stability of sulfide electrolytes

A sulfide electrolyte and positive electrode material technology, applied in the field of materials, can solve the problems of unstudied material optimization and modification of the performance of all-solid-state sulfide batteries, so as to reduce the electrochemical side reactions at the interface, increase the capacity, and reduce the interface impedance Effect

Active Publication Date: 2022-04-26
YANGTZE RIVER DELTA PHYSICS RES CENT CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But existing studies are all about LiNi 0.5 mn 1.5 o 4 Coating of materials, there is no research on optimizing and modifying the material itself to improve its performance in all-solid-state sulfide batteries

Method used

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  • Cathode materials and applications for improving the interfacial stability of sulfide electrolytes
  • Cathode materials and applications for improving the interfacial stability of sulfide electrolytes
  • Cathode materials and applications for improving the interfacial stability of sulfide electrolytes

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] This embodiment is used to compare raw material LiNi 0.5 mn 1.5 o 4 , LiNi protected by the present invention 0.5 mn 1.5 S x o 4-x (x=0.1,0.15,0.2), and excessive doping of S element LiNi beyond the scope of the present invention 0.5 mn 1.5 S x o 4-x (x=0.7) characteristics of the positive electrode material.

[0057] First illustrate the test equipment and test conditions of the present embodiment:

[0058]X-ray diffraction measurements were performed on a Bruker AXSD8 laser with copper Kα radiation of λ = 1.54178 in the range 10° ≤ 2θ ≤ 80°. Scanning electron microscopy tests were performed using a Hitachi S4800 scanning electron microscope, and elemental surface scans of the test surfaces were performed using energy dispersive X-ray spectroscopy (EDX). Fourier Transform Infrared Spectroscopy (FTIR) tests were performed using a Nicolette 8700 infrared spectrometer. The functional groups of all samples were tested using Fourier transform infrared spectrosco...

Embodiment 2

[0078] This embodiment provides the positive electrode material LiNi with cation doping on the basis of the LNMOS0.15 of the above-mentioned embodiment 1. 0.415 mn 1.245 Cu 0.05 Mg 0.02 Y 0.01 B 0.01 Fe 0.1 S 0.15 o 3.85 .

[0079] This embodiment selects nickel-manganese precursor Ni 0.25 mn 0.75 (OH) 2 , the lithium source is Li 2 CO 3 , the sulfur source is sulfur powder.

[0080] Put the nickel-manganese precursor, an excess of 5% lithium source, sulfur powder, copper oxide, magnesium oxide, iron oxide, boric acid, and yttrium oxide in a mortar and grind for 2 hours according to the required molar ratio, so that the lithium source powder and the sulfur source The powder is uniformly mixed with the nickel-manganese precursor to obtain a mixed material. During batch preparation, the material can also be placed in a ball mill tank with a rotating speed of 230-400 rpm, a mixing time of 2-6 hours, and a material filling efficiency of 55% in the equipment to obtain...

Embodiment 3

[0089] This embodiment provides the positive electrode material LiNi with cation doping on the basis of the LNMOS0.15 of the above-mentioned embodiment 1. 0.45 mn 1.35 Al 0.06 Fe 0.1 Ti 0.03 Nb 0.01 S 0.15 o 3.85 .

[0090] This embodiment selects nickel-manganese precursor Ni 0.25 mn 0.75 (OH) 2 , the lithium source is Li 2 CO 3 , the sulfur source is sulfur powder.

[0091] Put the nickel-manganese precursor, an excess of 5% lithium source, sulfur powder, niobium pentoxide, iron oxide, titanium oxide, boric acid, and aluminum oxide in a mortar and grind for 2 hours according to the required molar ratio to make the lithium source powder, The sulfur source powder is uniformly mixed with the nickel-manganese precursor to obtain a mixed material. During batch preparation, the material can also be placed in a ball mill tank with a rotating speed of 230-400 rpm, a mixing time of 2-6 hours, and a material filling efficiency of 55% in the equipment to obtain a mixed mat...

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Abstract

The invention relates to a positive electrode material and application for improving the interface stability of a sulfide electrolyte. The general chemical formula of the cathode material is: Li 1‑z Z z Ni a mn b M1 c M2 d M3 e S x o 4‑x ; where 0≤z<1, 0<a≤0.5, 0<b≤1.5, 0≤c<2, 0≤d≤2, 0≤e≤2, 0.01≤x<0.65, a+b+c+ d+e=2; wherein, Z is a cation doped with a Li site, and the valence is +1; M1, M2, and M3 are respectively cations doped with a transition metal site; S is sulfur. The doping of anion S can effectively suppress the serious space charge layer effect and interdiffusion of elements between the sulfurized electrolyte and the layered oxide cathode material, reduce the electrochemical side reaction at the interface, thereby increasing the capacity, reducing the interface impedance, and optimizing the electrical conductivity of the material. chemical properties.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a positive electrode material for improving the interface stability of a sulfide electrolyte and its application. Background technique [0002] Due to high voltage, high energy density, long cycle life, and stable battery chemistry, lithium-ion batteries are widely used in mobile devices, emergency power systems, and hybrid electric vehicles (HEV), etc., and have become a leader in various energy storage applications . At present, traditional lithium-ion batteries are limited by the low theoretical capacity of electrode materials, and there is limited room for further improvement of energy density, which makes it difficult to support the requirements of next-generation electronic devices for high-energy-density energy storage systems. In addition, the liquid electrolyte used in conventional lithium-ion batteries has safety risks such as flammability, explosion and leakage. Es...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 吴凡王玥李泓
Owner YANGTZE RIVER DELTA PHYSICS RES CENT CO LTD
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