4.7 Article

Chessboard-Like Silicon/Graphite Anodes with High Cycling Stability toward Practical Lithium-Ion Batteries

Journal

ACS APPLIED ENERGY MATERIALS
Volume 4, Issue 1, Pages 775-783

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsaem.0c02621

Keywords

Li-ion battery; Al-Si alloy; chessboard-like; silicon/graphite; anode

Funding

  1. National Natural Science Foundation of China [21706292]
  2. Hunan Provincial Science and Technology Plan Project, China [2017TP1001]
  3. Hunan Provincial Natural Science Foundation of China [2020JJ4107]
  4. Innovation-Driven Project of Central South University [2020CX037]
  5. Open Sharing Fund for the Large-scale Instruments and Equipment of Central South University
  6. Undergraduates Innovative Training Foundation of Central South University [20200011020026]
  7. Open Research Fund Program of Key Laboratory of Deep Geodrilling Technology, Ministry of Natural Resources [KF201901]

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The utilization of a chessboard-like Si/graphite anode with a homogeneous distribution of Si on the surface of graphite provides high specific capacity and excellent cycling performance for lithium-ion batteries, achieved through low-cost raw materials and industrial production methods.
The coutilization of silicon (Si) and graphite is a commercially viable method for realizing high-energy-density anode materials for lithium-ion batteries. However, the high cost and complicated manufacturing process for Si/graphite composite anodes hinder their practical application. Herein, a chessboard-like Si/graphite anode with a homogeneous distribution of Si on the surface of graphite was prepared using low-cost raw materials and processes compatible with industrial production methods. After optimizing the ratio between Si and graphite, the Si/graphite composite demonstrated a high reversible specific capacity of 522.4 mA h g(-1) at 1 A g(-1) after activation, along with excellent cycling stability with 92.9% capacity retention after 400 cycles. The chessboard-like distribution of Si particles in the electrode alleviates electrode swelling and improves capacity retention. A porous structure of Si was developed to buffer the volume expansion and increase the compatibility of the Si/graphite composite. The graphite functioned as a supporting and conductive matrix that provides transmission channels for Li+ ions. Therefore, this structure of the Si/graphite composite contributes to its high specific capacity and excellent cycling performance.

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