Secondary lithium battery and method for manufacturing the same

Abstract

The invention relates to a lithium-ion secondary battery and a manufacturing method thereof. The battery comprises a positive electrode flake, a negative electrode flake, a diaphragm, electrolyte and a packaging shell body; positive electrode materials of the positive electrode flake comprise lithium salt with the positive electrode reversible extraction of lithium ions, a carbon conductive agent and a binding agent; the weight percentage of the three positive electrode materials is as follows, the lithium salt is 80 percent-98 percent, the carbon conductive agent is 0.5 percent-18.5 percent, and the binding agent is 1.5 percent-19.5 percent; negative electrode materials of the negative electrode flake comprise one of the lithium salt with the negative electrode reversible extraction of lithium ions, oxides with reversible extraction of lithium ions and sulfides with reversible extraction of lithium ions or the combination thereof, the carbon conductive agent and the binding agent; the weight percentage of the three negative electrode materials is as follows, the lithium salt is 80 percent-98 percent, the carbon conductive agent is 0.5 percent-18.5 percent, and the binding agent is 1.5 percent-19.5 percent; the electrolyte of electrolyte fluid is soluble lithium salt or lithium hydroxide which can not react with water, and the solvent is water or the organic solvent. The method comprises the steps of producing and packaging the positive and the negative electrode flakes, the diagram, the electrolyte and a battery cell and into the shell. The invention reduces the manufacturing difficulty and the production cost of the lithium-ion secondary batteries and expands the types and the scope of application of the lithium-ion secondary batteries.

Description

technical field [0001] The present invention relates to a lithium ion battery, and also to a manufacturing method of the lithium ion battery, more specifically, to a secondary lithium ion battery and a manufacturing method thereof. Background technique [0002] Existing secondary lithium-ion batteries usually use carbon materials as the negative electrode material. When the battery is charged, lithium ions continuously migrate from the positive electrode to the negative electrode, so that the internal potential of the battery reaches the rated level, completes charging, and realizes repeated use of the battery. [0003] Because the negative electrode material of the existing secondary lithium ion battery is easy to react with water, the battery is very sensitive to moisture. In order to prevent moisture from penetrating into the battery casing, the casings of existing secondary lithium-ion batteries are generally packaged with metal (steel, aluminum) casings, plastic casings...

AI Technical Summary

Problems solved by technology

[0005] 1. Due to the need to prevent moisture from penetrating into the battery case, the existing secondary lithium-ion battery has high requirements on the sealing of the case, which increases the manufacturing difficulty and production cost of the existing secondary lithium-ion battery;

[0006] 2. In the actual production of the battery, it is very difficult for the battery case to be absolutely sealed. Therefore, the existing secondary lithium-ion battery has a case that is not sealed, causing moisture to penetrate into the interior of the battery case, resulting in battery failure. The gas rises, causing the battery to fail

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