A kind of mems miniature solid-state lithium-ion battery and preparation method thereof

Abstract

The invention discloses a MEMS miniature solid lithium ion battery and a preparation method thereof. By setting the lithium battery as a MEMS cantilever beam structure, the volume change of the silicon negative electrode layer during battery charge and discharge causes the MEMS cantilever beam structure to bend and deform, effectively releasing and reducing the pressure caused by the volume change of silicon in the silicon negative electrode layer. The stress reduces the damage and destruction of the silicon negative electrode layer caused by the stress. The MEMS miniature solid-state lithium-ion battery provided by the invention has the advantages of small size, simple structure, low manufacturing cost, high reliability, long life, high energy density, and online detection function.

Description

technical field [0001] The invention relates to a micro-solid lithium-ion battery and a preparation method thereof, in particular to a MEMS (Micro-Electro-Mechanical System, micro-electro-mechanical system) micro-solid-state lithium-ion battery and a preparation method thereof. Background technique [0002] Compared with nickel-cadmium or nickel-metal hydride batteries, lithium-ion batteries have the advantages of high working voltage, large specific capacity, long cycle life, no memory effect and low environmental pollution, so they are used in mobile phones, notebook computers, implanted medical devices, etc. And electric vehicles and many other fields have been widely used. Conventional lithium-ion batteries use liquid electrolyte solutions, which are often highly reactive, highly flammable, and present the risk of leakage and explosion due to excessive operating temperatures or short circuits. The use of solid-state electrolytes (lithium-ion batteries using solid-state ...

AI Technical Summary

Problems solved by technology

However, enough space must be kept between these discrete Si nanostructures to accommodate deformation, so compared with using Si films as battery anodes, the tap density of Si nanostructures as battery anodes is lower, and the active material content that can be used to store energy Less, the corresponding battery energy density is low

In addition, Si nanostructures also have the disadvantages of complex manufacturing process as the negative electrode of the battery, which leads to the disadvantages of high manufacturing cost of the battery and poor repeatability of different batches of battery performance.

Si nanostructures also have problems such as poor mechanical properties (such as easy collapse)

[0004] In addition, in actual use, the battery will inevitably face battery failure problems caused by life, reliability, etc., which will cause the battery to fail to supply power normally.

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