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A lithium-aluminum double-ion rechargeable battery

A rechargeable battery and dual-ion technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of large ionic radius, difficult ion insertion, and difficult breakthrough, and achieve excellent performance, increase energy density, and effective charge and discharge. Effect

Active Publication Date: 2021-04-13
JIANGXI DIBIKE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In recent years, the application potential of lithium-ion secondary batteries with high energy density is increasing, but limited by the monovalent lithium ions that lithium-ion batteries rely on when working, there is a serious bottleneck in the improvement of the energy density of lithium-ion secondary batteries.
In view of this, the introduction of multivalent ions can effectively increase the energy density in theory; however, it has been difficult to make breakthroughs in practical applications.
The main reason is that the ionic radius of multivalent ions is large, which makes it difficult for ions to intercalate into graphite or other carbon-based materials; at the same time, due to the existence of solid electrolyte interfacial film (SEI), multivalent ions cannot reach the negative electrode surface through SEI for the next reduction reaction.

Method used

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  • A lithium-aluminum double-ion rechargeable battery
  • A lithium-aluminum double-ion rechargeable battery
  • A lithium-aluminum double-ion rechargeable battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Make a single-ion lithium embedded sample battery to demonstrate the characteristic parameters such as working voltage and capacity of existing lithium-ion batteries. Positive electrode components include: 28% (diameter 20-60nm) V 2 o 5 , 6% conductive carbon black, 15% PVDF binder, 23% DBP plasticizer and 28% acetone. After the positive electrode component was dried at 22°C for 0.5 hours, a stable film was formed, and then a 1cm area was cut from the film. 2 The circular positive pole piece, and then use ether to extract the plasticizer in the positive pole piece. A typical positive electrode sheet contains 5-20mg of V 2 o 5 active substance.

[0032] The production process of the negative pole piece is similar to that of the positive pole piece, except that silicon powder is used instead of V 2 o 5Lithium-silicon alloy Li is formed by covering the dry and purified silicon powder film on the metal lithium foil. x Si negative electrode sheet, and finally cut the...

Embodiment 2

[0035] Using the same manufacturing process as in Example 1, make another dual-ion battery as a comparison group test: the active materials of the positive and negative electrodes are V 2 o 5 and MoS x , the formulation of the electrolyte is 0.5M Y(ClO 4 ) 3 , EC (ethylene carbonate): DMC (dimethyl carbonate) = 2:1. Test the assembled battery according to the same conditions in Example 1 and record the data: as figure 2 Y in 3+ As shown in the first discharge characteristic curve, the first discharge capacity of the battery is increased to 200mAh / g.

Embodiment 3

[0037] Using a similar manufacturing process and active material as in Example 2, the double ion battery in the specific embodiment of the present invention is made: at least one ion in the double ion is Al 3+ . Specifically, although the active materials of the positive and negative electrodes are the same as in Example 1, the active cations in the electrolyte are different: the formula of the electrolyte is 0.5M Al(ClO 4 ) 3 , EC (ethylene carbonate): DMC (dimethyl carbonate) = 2:1. Such as figure 2 Al in 3+ As shown in the first discharge characteristic curve, the first discharge capacity of the battery has been significantly improved, reaching 300mAh / g.

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Abstract

The invention relates to a lithium-aluminum double-ion rechargeable battery, comprising a positive pole piece, a negative pole piece, a diaphragm located between the positive pole piece and the negative pole piece, and an electrolyte solution, wherein the electrolyte solution is composed of polyvalent aluminum ion solute and a non-aqueous solvent The positive pole piece is composed of an active material capable of reversibly extracting and intercalating multivalent cations, and the negative pole piece is composed of an active material capable of reversibly intercalating and deintercalating a second ion from the above solvent, and the second ion is an alkali metal ion. The separator has electronic insulation and ion permeability; the electrolyte contains non-aqueous solvents and can provide polyvalent aluminum ions Al 3+ And will not produce solutes for electrochemical deposition. It can charge and discharge more efficiently, change the migration mechanism of multivalent ions between the positive and negative plates, and effectively improve the energy density of the battery.

Description

technical field [0001] The invention relates to a rechargeable battery with high platform voltage and high energy density, in particular to a lithium-aluminum double-ion rechargeable battery. Background technique [0002] In recent years, the application potential of lithium-ion secondary batteries with high energy density is increasing, but limited by the monovalent lithium ions that lithium-ion batteries rely on to work, there is a serious bottleneck in the improvement of the energy density of lithium-ion secondary batteries. In view of this, the introduction of multivalent ions can effectively increase the energy density in theory; however, it has been difficult to make a breakthrough in practical applications. The main reason is that the ionic radius of multivalent ions is large, which makes it difficult for ions to intercalate into graphite or other carbon-based materials; at the same time, due to the existence of solid electrolyte interfacial film (SEI), multivalent io...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0587H01M10/0568H01M4/48H01M4/58H01M4/583H01M4/38H01M4/40
CPCH01M4/381H01M4/382H01M4/40H01M4/405H01M4/483H01M4/5815H01M4/582H01M4/583H01M10/0568H01M10/0587H01M2300/0025Y02E60/10Y02P70/50
Inventor 胡以轩
Owner JIANGXI DIBIKE
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