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Aqueous sodium-based mixed ion secondary battery

A hybrid ion and secondary battery technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of small reversible capacity of positive and negative electrode materials, small choice of positive and negative electrode materials, and low energy density of batteries, etc., to achieve Good cycle performance, high energy density, high specific capacity effect

Active Publication Date: 2020-07-31
北京恩力动力科技有限公司 +3
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aqueous sodium-ion batteries rely on the intercalation and extraction of metal ions in the positive and negative electrode materials to store and release electrical energy. However, since the battery is limited to the intercalation and extraction of single ions, there are the following deficiencies in practical applications: First, it has a suitable intercalation ion potential The choice of positive and negative electrode materials is small; secondly, limited by the ion intercalation mechanism, the reversible capacity of the positive and negative electrode materials is small, resulting in low energy density of the battery

Method used

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Experimental program
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Effect test

Embodiment 1

[0029] The positive electrode formula is 50wt.% sodium manganate Na x MnO 2(X=0.2~1.0) powder, 30wt.% AC and 10wt.% SP mixed conductive carbon material and 10wt.% PTFE as binder; negative electrode formula is 80wt.% zinc oxide powder, 12% SP conductive Carbon materials and 8% PTFE are used as binders; according to the positive and negative electrode formulas, the positive electrode electrode sheet and the negative electrode electrode sheet are prepared respectively by kneading and smelting thick film forming process, and the electrolyte is dissolved with saturated zinc oxide with a solubility of 6mol / L sodium hydroxide solution, the diaphragm is selected as 0.2mm thick non-woven fabric + hydrophilic PP composite diaphragm, and assembled into a water-based sodium-based mixed-ion secondary battery A according to this, and the battery A is tested for 40 cycles at a rate of 1C. The capacity retention rate after the cycle, the results are as follows figure 1 shown.

Embodiment 2

[0031] The positive electrode formula is 85wt.% sodium manganate Na x MnO 2 (X=0.2~1.0) powder, 8wt.% of AC and 2wt.% of SP mixed conductive carbon material and 5wt.% of PVA as binder; the negative electrode formulation is 92wt.% of zinc oxide powder, 3wt.% of SP and 2wt.% AC mixed conductive carbon material and 3wt.% CMC as a binder; according to the positive and negative electrode formulas, the positive electrode and the negative electrode are prepared by the coating process, and the electrolyte is dissolved with saturated oxidation 8mol / L sodium hydroxide solution of zinc; the diaphragm is selected as 0.2mm thick non-woven fabric + hydrophilic PP composite diaphragm, and assembled into a water-based sodium-based mixed-ion secondary battery B according to this, and its 1C rate is measured for battery B The capacity retention rate after 40 cycles of the next cycle, the results are as follows figure 2 shown.

Embodiment 3

[0033] The positive electrode formula is 70wt.% sodium manganate Na x MnO 2 (X=0.2~1.0) powder, 10wt.% of AC and 10wt.% of SP mixed conductive carbon material and 10wt.% of PTFE as binder; the negative electrode formulation is 73wt.% of zinc oxide powder, 10wt.% of SP and 5wt.% AC mixed conductive carbon material and 12wt.% PTFE were used as binders; according to the positive and negative electrode formulas, the positive electrode pole piece and the negative pole pole piece were prepared by kneading and kneading thick film forming process, and the electrolyte was 4mol / L sodium hydroxide solution with saturated zinc oxide dissolved, the diaphragm is selected as 0.2mm thick non-woven fabric + hydrophilic PP composite diaphragm, and assembled into a water-based sodium-based mixed-ion secondary battery C according to this, and the battery C is measured Its capacity retention rate after 40 cycles at 1C rate, the results are as follows image 3 shown.

[0034] Table 1 Example 1 t...

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Abstract

The invention provides an aqueous sodium-based mixed ion secondary battery. A positive electrode active material of the battery is sodium manganate NaxMnO2 (X is equal to 0.2 to 1.0); a negative electrode active material of the battery is a metal oxide; an electrolyte is a sodium hydroxide solution dissolved with the saturated metal oxide; and a diaphragm is a composite diaphragm of non-woven fabric and hydrophilic PP; the positive electrode comprises a positive electrode active material (45 to 85 wt.%), a first conductive carbon material (10 to 45 wt.%) and a first binder material (5 to 10 wt.%); and the negative electrode comprises a negative electrode active material (73 to 92 wt.%), a second conductive carbon material (5 to 15 wt.%) and a second binder material (3 to 12 wt.%). The capacity retention ratio of the aqueous sodium-based mixed ion secondary battery is 92.6% after the aqueous sodium-based mixed ion secondary battery is cycled for 40 circles at the rate of 1C, and the aqueous sodium-based mixed ion secondary battery has good charge-discharge cycling stability.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an aqueous sodium-based mixed ion secondary battery. Background technique [0002] Aqueous ion batteries have the characteristics of high safety, no pollution, low cost and long life, and can meet the requirements of large-scale energy storage applications. As one of the key technologies for the development and utilization of renewable energy (light energy and wind energy, etc.) and the construction of smart grids , its research and industrialization are getting more and more attention. At present, the application of lithium transition metal oxides in aqueous ion batteries as cathode materials is the earliest and most widely studied, and it is also the closest to industrialization. [0003] However, in fact, the lithium resources on the earth are difficult to support the application requirements of large-scale energy storage systems, not to mention the growing demand for lithi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/62H01M10/36
CPCH01M4/362H01M4/505H01M4/625H01M4/485H01M10/36Y02E60/10
Inventor 丁波杨鹏曹翊李昌盛罗刚国车勇戴翔
Owner 北京恩力动力科技有限公司
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