Manufacturing method of lithium ion battery capable of resisting storage discharge to zero volt

Abstract

The invention belongs to the technical field of chemical engineering. The invention especially relates to a lithium ion battery resistant to storage discharge to zero volt and a battery discharge process test. The invention discloses a reversible lithium ion battery. Discharging can be performed until the voltage between a cathode and an anode is zero volt, and the battery cannot be damaged perpetually; the novel anode current collector is provided, a titanium foil is selected as the anode current collector, and the dissolving potential of the titanium foil is higher than the zero-point crosspotential of the cathode and the anode of the battery, so that the permanent damage to the battery due to dissolution and precipitation of the copper foil in the process of discharging the lithium ionbattery to 0V is avoided.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a lithium-ion battery capable of storing and discharging to zero volts. Background technique [0002] Lithium-ion batteries, as electrochemical energy storage devices, are widely used in many energy storage fields such as consumer electronics, transportation power tools, and military and civilian electronic equipment because of their advantages such as high energy density, good cycle life, no memory effect, and fast charging. Lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, electrolytes, separators, external connections, and packaging components. Among them, the positive electrode and the negative electrode contain active electrode materials, conductive agents, binders, etc., and are evenly coated on the aluminum foil and copper foil current collectors after stirring. [0003] According to its appearance, lithium-ion ba...

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Problems solved by technology

[0006] During long-term storage, lithium-ion batteries will face the danger of excessive self-discharge, especially at low open circuit voltage; excessive self-discharge will lead to low battery voltage, causing the copper foil of the negative electrode collector to dissolve, etc. risk; copper metal dissolves into copper ions, and Li + At the same time, the intercalation reaction of the positive electrode occurs on the surface of the positive electrode; and as the discharge state of the battery changes to the charged state, the copper on the surface of the positive electrode will dissolve again, and then precipitate on the surface of the negative electrode, and the resulting metallic copper dendrites may pierce the separator, causing the battery to be positive. A short circuit occurs at the negative electrode; at the same time, the continuous generation of the negative solid electrolyte interface film (passivation layer, referred to as SEI) consumes the limited Li + , aggravate the dissolution of negative electrode copper foil; excessive discharge or low voltage will lead to complete failure of lithium-ion batteries

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