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A kind of composite electrode material and its preparation method and application

A composite electrode and composite material technology, applied in the direction of negative electrode, battery electrode, active material electrode, etc., to achieve the effects of improving cycle life, improving performance of lithium metal batteries, and facilitating preparation

Active Publication Date: 2022-05-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high activity, large volume deformation, and lithium dendrites of lithium metal have always been obstacles that limit the application of lithium metal anodes.
At present, there are few related reports on obtaining energy storage performance and stable cycle life by maintaining the dynamic stability of SEI.

Method used

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  • A kind of composite electrode material and its preparation method and application
  • A kind of composite electrode material and its preparation method and application
  • A kind of composite electrode material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] SMA and (R)-(2,2-dimethyl-1,3dioxolan-4-yl)methylamine (DMDOL) were added to DMF at a ratio of 1:2 (MAn unit: DMDOL), Placed in a 60°C oil bath for 24 hours under vacuum, the product was recrystallized with toluene and the filtrate was dried to obtain (R)-(2,2-dimethyl-1,3dioxolane-4 -yl) methylamine pendant styrene ring-opened maleic anhydride (SMA-DMDOL), product molecular weight M n =4319, M w =7769.

[0040]The prepared SMA-DMDOL was dissolved in anhydrous DMF, configured into a 5 M solution, and the thick lithium sheet was soaked in the solution for 30 minutes, then taken out and dried in a vacuum oven to obtain (R)- (2,2-Dimethyl-1,3-dioxolan-4-yl)methylamine pendant polystyrene ring-opened maleic anhydride interfacially modified lithium metal anode with artificial solid electrolyte.

[0041] All the above operations were performed in a glove box.

[0042] The modified lithium metal anode was mixed with commercially pure lithium in the electrolyte (1M LiPF 6 ...

Embodiment 2

[0045] This embodiment carries out similar parallel test with embodiment 1, and the difference is that lithium metal is changed into 84Li-B alloy, and other preparation methods are exactly the same as embodiment 1, obtains containing (R)-(2,2-dimethyl -1,3-dioxolan-4-yl)methylamine pendant polystyrene ring-opened maleic anhydride artificial solid electrolyte modified lithium boron alloy anode.

[0046] The modified lithium-boron alloy negative electrode and the bare lithium-boron alloy negative electrode were mixed in the electrolyte (1M LiPF 6 , EC:EMC:FEC=3:7:1 (v / v)) for electrochemical tests at 1 mA / cm 2 The current density of 1 mAh / cm 2 Under the condition of specific area specific capacity, the symmetrical battery can reach 400 hours of long-term cycle and still maintain a low polarization voltage (less than 50 mV). Test results such as figure 2 shown.

Embodiment 3

[0048] This embodiment and embodiment 1 carry out similar parallel test, the difference is that lithium metal is changed to Li-B-Ag alloy, and other preparation methods are exactly the same as embodiment 1, and the obtained compound containing (R)-(2,2-di Methyl-1,3-dioxolan-4-yl)methylamine pendant polystyrene ring-opened maleic anhydride interfacially modified Li-B-Ag alloy anode with artificial solid electrolyte.

[0049] The modified Li-B-Ag alloy negative electrode and the bare Li-B-Ag alloy negative electrode were mixed in the electrolyte (1M LiPF 6 , EC:EMC:FEC=3:7:1 (v / v)) for electrochemical tests, at 1 mA / cm 2 The current density of 10 mAh / cm 2 Under the condition of specific area specific capacity, the symmetric battery can reach 800 hours of long-term cycle and still maintain a low polarization voltage (less than 40 mV). Test results such as image 3 shown.

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Abstract

The invention provides a composite electrode material and its preparation method and application. The composite electrode material includes a pole piece base and an artificial solid electrolyte layer coated on the surface of the pole piece base. The artificial solid electrolyte layer is composed of a first polymer The structure of the first polymer is shown in formula I: (formula I); wherein, n=10~1000; the pole piece matrix is ​​at least one of lithium metal or a composite material containing metal lithium. The present invention protects the electrode matrix by coating the ether-containing side group copolymer on the surface of the electrode matrix as an artificial solid electrolyte layer. The interface of the solid electrolyte layer has high ion conductivity and strong lithium affinity, and induces uniform deposition of lithium ions At the same time, it prevents the reaction between the electrolyte and the electrode matrix, stabilizes the interface of the electrode matrix, and reduces the consumption of the electrolyte.

Description

technical field [0001] The invention relates to the field of composite electrode preparation, and more specifically, to a composite electrode material and its preparation method and application. Background technique [0002] With the rapid development of society, the demand for electric vehicles and consumer electronics products is increasing day by day. Finding new energy materials to replace the original petrochemical materials has become an important issue in the development of the new era. Lithium metal as a battery anode material can provide a very high specific capacity (3860mAh / g) and a larger working voltage window (reduction electrode potential -3.04V), which is an effective next-generation new energy material. However, the high activity, large volume deformation, and lithium dendrites of lithium metal have always been obstacles that limit the application of lithium metal anodes. At present, the main problems of metal lithium as the negative electrode of lithium ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/40H01M4/62H01M10/052
CPCH01M4/366H01M4/382H01M4/405H01M4/628H01M10/052H01M2004/021H01M2004/027
Inventor 陈立宝娜仁托雅旷桂超
Owner CENT SOUTH UNIV
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