Pre-sodium-modified positive pole piece, application of pre-sodium-modified positive pole piece, sodium-ion battery and preparation method of sodium-ion battery

A technology of sodium ion battery and positive pole piece, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of increasing the difficulty of industrialization and production efficiency, increasing polarization, and difficulty in high-performance sodium ion battery systems, etc. Achieve the effect of reducing material structure damage and side reactions, reducing polarization, and improving electrochemical kinetics
CN114649504APending Publication Date: 2022-06-21溧阳中科海钠科技有限责任公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
溧阳中科海钠科技有限责任公司
Publication Date
2022-06-21

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Abstract

The invention belongs to the technical field of battery materials. The invention provides a pre-sodium-modified positive pole piece. The pre-sodium-modified positive pole piece comprises high-voltage sodium ion positive pole slurry, high-capacity sodium ion positive pole slurry and a current collector, and the thickness of the high-voltage sodium ion positive electrode slurry is 10-15% of the sum of the thicknesses of the high-voltage sodium ion positive electrode slurry and the high-capacity sodium ion positive electrode slurry. Due to the effective use of the positive electrode sodium supplementing technology, the irreversible sodium loss of the hard carbon negative electrode is reduced, the dynamic performance of the sodium ion battery is improved, and the polarization is reduced; therefore, the high-performance sodium ion battery has the initial coulombic efficiency of more than 95%, the energy density of more than 150Wh / kg, the cycle life of more than 6000 weeks, the charge-discharge capacity at-40 DEG C and the continuous discharge capacity at 30C multiplying power, and the comprehensive electrochemical performance of the sodium ion battery is improved.
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Description

technical field

[0001] The invention relates to the technical field of battery materials, in particular to a pre-sodiumized positive electrode plate and its application, as well as a sodium ion battery and a preparation method thereof. Background technique

[0002] The performance advantages of lithium-ion batteries make them widely used in the field of 3C, energy storage and electric vehicles. However, the problems of uneven distribution of lithium resources, shortage of resources, high price, and a large amount of dependence on imports are becoming increasingly prominent. Therefore, the development of Alternative or complementary new energy storage devices have become particularly important. Na-ion batteries have gained extensive attention and research due to their abundant resources, low cost, and environmental friendliness. In addition, sodium and lithium belong to the same main group, and the two have similar electrochemical properties. Na-ion batteries and lithium-ion ...

Claims

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