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Three-layer electrode structure for alloy anode of lithium ion battery

A lithium-ion battery, alloy negative electrode technology, applied in battery electrodes, structural parts, secondary batteries, etc., can solve the problems of lithium-ion battery alloy negative electrode structure less involved, not suitable for large-scale commercial production, harsh operating conditions, etc. Achieve the effects of low production cost, reduced process difficulty and cost, and no environmental pollution

Active Publication Date: 2014-10-15
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the prepared alloy negative electrode has excellent cycle performance, high charge and discharge capacity, and small initial irreversible capacity, the operating conditions are harsh, the cost is high, it is not suitable for large-scale commercial production, and the safety factor is low.
[0004] However, the current research only focuses on the microstructure of the electrode material itself, and the design of the lithium-ion battery alloy negative electrode structure rarely involves

Method used

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  • Three-layer electrode structure for alloy anode of lithium ion battery
  • Three-layer electrode structure for alloy anode of lithium ion battery
  • Three-layer electrode structure for alloy anode of lithium ion battery

Examples

Experimental program
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preparation example Construction

[0036] The preparation method of the deintercalated lithium active material layer is not limited, for example, it can be prefabricated by coating following the traditional lithium ion battery manufacturing process. Specifically, it can be prepared by mixing the lithium-deintercalation active material, the first conductive agent, the first binder, and a certain amount of solvent to form a slurry, coating it on the surface of the current collector layer, drying it in vacuum, and removing the solvent. Deintercalation of the lithium active material layer. Wherein the selection of the solvent is related to the first binder, if the first binder is an organic binder, an organic solvent, such as N-methylpyrrolidone, etc. can be used, if the first binder is a water-based binder, Water can be used as the solvent.

[0037] Using the traditional manufacturing process of lithium-ion batteries avoids the waste of resources, saves costs, and does not need to improve the equipment. The new p...

Embodiment 1

[0061] The preparation of the deintercalated lithium active material layer 2 is the same as that of Comparative Example 1. Mix polypyrrole nanowires, acetylene black, and sodium alginate pre-dissolved in water at a mass ratio of 9:0.5:0.5 to make a slurry, apply it to the deintercalation lithium active material layer 2, and dry it under vacuum at 70°C to make it inert The protective layer 4 is pressed into a three-layer electrode by 6MPa pressure. The battery assembly and test conditions are the same as in Comparative Example 1. The test results are shown in Table 1.

Embodiment 2

[0063] The preparation of the deintercalated lithium active material layer 2 is the same as that of Comparative Example 1. Polypyrrole nanowires, acetylene black and sodium alginate pre-dissolved in water are mixed to form a slurry at a mass ratio of 6:2:2. The preparation of the electrode is the same as Example 1. The battery assembly and test conditions are the same as in Comparative Example 1. The test results are shown in Table 1.

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Abstract

The invention relates to a three-layer electrode structure for the alloy anode of a lithium ion battery. The three-layer electrode structure comprises a current collector layer, a de-intercalation lithium active material layer and an inert material protecting layer, which are laminated sequentially, wherein the inert material protecting layer is provided with inert protective substances; the inert protective substances are macromolecule polymer fiber which does not perform de-intercalation lithium reaction and have elasticity and electrical conductivity within the circulating voltage range. According to the invention, for the inherent volume expansion effect of the alloy anode, and starting from the design aspect of a process structure, the three-layer electrode structure is adopted, the inert material protecting layer is positioned on the surface of the active material layer, and the fiber network structure of the inert material protecting layer is used, so that inner stress of the de-intercalation lithium alloy anode, which is produced due to the volume effect is effectively relieved, pulverization and crushing of electrode material are prevented, the integrity of the electrode is ensured, electrical contact of active materials and the current collector is maintained, meanwhile, the active material layer is isolated from being in direct contact with an electrolyte through the inert material protecting layer, and corrosion of the electrolyte to active materials is reduced.

Description

technical field [0001] The invention relates to a lithium ion secondary battery, in particular to a three-layer electrode structure for the lithium ion battery alloy negative electrode. Background technique [0002] The energy crisis is intensifying, and there is an urgent need for new energy sources with high power and high energy to replace fossil energy sources. Lithium-ion batteries have been attracting attention for their advantages such as high specific energy density, long cycle life, and no pollution. In the study of its negative electrode materials, a class that can form an alloy with Li and have a high specific capacity has aroused great interest, such as Sn, Sb, Si, Ge, etc. and their compounds (Li 4.4 Si, 4200mAh·g -1 ). However, this type of alloy negative electrode has a serious volume effect (>300%) in the process of electrochemically deintercalating lithium ions, and the mechanical stress generated will pulverize the active material of the alloy and rapi...

Claims

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Application Information

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IPC IPC(8): H01M4/134
CPCY02E60/122H01M4/134H01M4/623H01M4/625H01M10/0525Y02E60/10
Inventor 温兆银彭鹏刘宇
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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