硅基复合材料及其制备方法和负极
By loading silicon nanoparticles into a porous matrix and introducing heteroatom separation, a dense silicon-based composite material is formed, which solves the problem of volume expansion of silicon-based composite materials in lithium-ion batteries and improves cycle stability and mechanical strength.
CN119581506BActive Publication Date: 2026-07-17LANXI ZHIDE ADVANCED MATERIALS CO LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- LANXI ZHIDE ADVANCED MATERIALS CO LTD
- Filing Date
- 2023-09-06
- Publication Date
- 2026-07-17
AI Technical Summary
Technical Problem
Existing silicon-based composite materials exhibit significant volume expansion during the charging and discharging process in lithium-ion batteries, leading to a shortened cycle life.
Method used
Silicon nanoparticles are loaded onto a porous matrix and their size and distribution within the three-dimensional intersecting channels are controlled by separating and confining the silicon nanoparticles with heteroatoms. Combined with closed pores as buffer spaces, a dense structure is formed to alleviate volume expansion.
Benefits of technology
It effectively prevents the collapse of the composite material structure caused by the expansion of silicon lithium intercalation, and improves the cycle stability and mechanical strength of the electrode.
✦ Generated by Eureka AI based on patent content.
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Figure CN119581506B_ABST
Abstract
本发明提供了一种硅基复合材料及其制备方法和负极。该硅复合材料包括多孔基体、硅纳米颗粒和杂原子，多孔基体具有包含多级孔径的三维交叉孔道，孔道内包含至少一个硅纳米颗粒，杂原子至少部分包覆于所述硅纳米颗粒表面，和 / 或，杂原子间隔于所述硅纳米颗粒之间。本申请提供的硅基复合材料采用多孔基体作为基底材料负载硅纳米颗粒和掺杂于硅纳米颗粒中的杂原子，通过将杂原子掺杂于硅纳米颗粒中分隔和束缚硅纳米颗粒，控制硅材料在孔道内的尺寸和分布，使得硅材料均匀分散在多孔基体的三维交叉孔道内，有效缓解了硅在充放电过程中的体积效应，防止嵌锂硅膨胀导致复合材料结构坍塌，提高了电极的循环稳定性。
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