一种锂离子电池的负极极片及锂离子电池

By employing a multi-layer structure in the lithium-ion battery anode sheet, combining graphite, hard carbon, and hydroquinone dilithium layers, the slow lithium intercalation speed and safety issues of graphite anode materials are solved, achieving improvements in high energy density, cycle stability, and fast charging performance.

CN224519876UActive Publication Date: 2026-07-17JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
Filing Date
2025-04-16
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing graphite anode materials in lithium-ion batteries suffer from slow lithium intercalation speed, poor rate performance, and the potential for lithium metal precipitation under fast charging and low-temperature conditions, which affects cycle performance and safety, making it difficult to meet the requirements of high energy density, high power density, and high safety performance.

Method used

The negative electrode adopts a multi-layer structure, including a current collector, a graphite active material layer, a hard carbon active material layer, and a hydroquinone dilithium modification layer. The graphite and current collector are closely bonded to improve processing stability, the hard carbon improves fast charging performance, and the hydroquinone dilithium layer regulates lithium ion diffusion and inhibits lithium dendrite growth.

Benefits of technology

It achieves high energy density, high cycle stability, and high current charge/discharge performance for lithium-ion batteries, improves fast charging performance, suppresses lithium dendrite formation, and enhances battery safety.

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Abstract

本实用新型提供了一种锂离子电池的负极极片，所述负极极片包括集流体和涂覆层；所述涂覆层包含设置在集流体上的活性材料层以及设置在所述活性材料层上的对苯二酚二锂层。本实用新型提供的多层结构的多种材料组成的复合负极极片，兼顾电池的高能量密度、高循环稳定性与大电流充放电性能，复合极片的体积变化小，循环稳定性高，并且可以提升锂离子电池的快充性能。
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Claims

1. A negative electrode sheet for a lithium-ion battery, characterized in that, The negative electrode sheet includes a current collector and a coating layer; The coating layer comprises an active material layer disposed on the current collector and a hydroquinone dilithium layer disposed on the active material layer; The thickness of the hydroquinone dilithium layer is 5~50 nm; The active material layer includes a first active material layer disposed on the current collector and a second active material layer disposed on the first active material layer; The thickness of the first active material layer is 30~34μm; The thickness of the second active material layer is 38~42μm.

2. The negative electrode sheet according to claim 1, characterized by The hydroquinone dilithium layer is disposed on the second active material layer.

3. A lithium-ion battery, characterized by, The lithium-ion battery includes the negative electrode sheet as described in any one of claims 1 to 2.