A negative electrode current collector and negative electrode sheet capable of safe lithium replenishment and a lithium replenishment battery

By employing a multi-layer lithium replenishment filling structure with through-holes in the negative electrode current collector, the lithium metal powder is hidden within the current collector, solving the problems of lithium replenishment safety risks and energy density improvement in existing technologies. This achieves a safe and controllable slow-release lithium replenishment effect, improving the energy density and cycle life of the battery cell.

CN116111107BActive Publication Date: 2026-09-01LISHEN (QINGDAO) NEW ENERGY CO LTD
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Patent Information

Application Number
CN202211463787.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-11-22
Publication Date
2026-09-01
Estimated Expiration
2042-11-22

AI Technical Summary

Technical Problem

Existing lithium replenishment technologies have safety risks, rapid response leading to structural defects and wasted cell space, making it difficult to achieve a safe and effective increase in energy density.

Method used

A negative electrode current collector is designed, which adopts a multi-layer lithium replenishment filling structure through the through hole, including a lithium metal powder layer and a solid electrolyte additive layer. The lithium metal powder is hidden in the current collector, and slow-release lithium replenishment is achieved by controlling the temperature and electrolyte dissolution rate.

Benefits of technology

It improves the energy density of the battery cell, ensures the safety of the lithium replenishment process, achieves a controllable slow release effect, reduces safety risks, and improves cycle life and storage performance.

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Abstract

This invention discloses a negative electrode current collector, comprising a basic foil material; multiple vertically penetrating through-holes are uniformly distributed at equal intervals on the basic foil material; each through-hole contains a lithium replenishment filler; the lithium replenishment filler includes lithium metal powder; the lithium replenishment filler is a multi-layered lithium replenishment filler; the multi-layered lithium replenishment filler includes at least one layer of lithium metal powder. This invention also discloses a negative electrode sheet and a lithium replenishment-type battery. This invention is scientifically designed, effectively improving the energy density of the battery cell, ensuring the safety of the lithium replenishment process, and allowing for controlled and gradual lithium replenishment, thus possessing significant practical value.
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