Capacitor of lithium ion battery

Abstract

The invention relates to a capacitor of a lithium ion battery. The capacitor comprises a capacitor shell, an organic electrolyte arranged in the capacitor shell, a winding core formed by isolating a positive plate from a negative plate through an ion permeability microporous membrane and winding, wherein the positive plate and the negative plate are respectively connected with a positive lug and a negative lug and are led out by the positive lug and the negative lug to a positive end and a negative end of the capacitor shell. A negative active material comprises a material A and a material B, wherein the material A comprises at least one of hard carbon and soft carbon, the material B comprises at least one of natural graphite, modified graphite and synthetic graphite, the material A accounts for 50.0%-95.0% of the capacity percentage of the negative active material, and the material B accounts for 5.0%-50.0% of the capacity percentage of the negative active material. The capacitor has the high-energy density characteristic of the lithium ion battery and the high-power density characteristic of a double electric layer capacitor.

Description

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AI Technical Summary

Benefits of technology

This patented technology improves upon existing batteries by combining certain components into one component called an elec trolytes that can be used for both charge storage and energy transfer functions. These improvements include improved performance at extreme temperatures or voltages while maintaining good electrical properties such as long cycle life and fast charging capabilities. Additionally, this new design allows for more precise control over various factors like composition and concentration levels within the eletrodes' compositions during production processes. Overall, these technologies improve the overall quality and durability of Lithium Ion secondary cells.

Problems solved by technology

The patent text discusses the challenges faced by lithium-ion batteries and capacitors in meeting the increasing demands for high energy density and output power in modern society. It highlights the limitations of lithium-ion batteries in terms of rate performance, power density, and voltage range, which can lead to safety hazards. It also mentions the relatively low energy density and high self-discharge rate of capacitors. To address these challenges, the patent proposes a hybrid capacitor that combines the power storage principles of lithium-ion batteries and electric double-layer capacitors. However, the existing methods mentioned in the patent have drawbacks such as high cost, complexity, and low practicability. Another patent proposes a supercapacitor battery that combines the interface electric double layer and lithium-ion battery intercalation and deintercalation. However, it only partially solves the issue of lithium ion source and does not effectively increase the energy density. The use of activated carbon in supercapacitor batteries can further reduce the energy density. Overall, the technical problems addressed in the patent text include the need for high energy density and high output characteristics, as well as the limitations of existing storage devices in terms of rate performance, power density, and energy density.

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