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Construction and Testing of Coin Cells of Lithium Ion Batteries
Published on: August 2, 2012
Electrochemically fabricated polypyrrole-cobalt-oxygen coordination complex as high-performance lithium-storage
Bingkun Guo1, Qingyu Kong, Ying Zhu
1Laboratory for Solid State Ionics, Institute of Physics, Chinese Academy of Sciences, 8 Nansanjie Str., Zhongguancun, Beijing 100190, P. R. China.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|December 1, 2011
Summary
Researchers developed a novel polypyrrole-cobalt-oxygen (PPy-Co-O) coordination complex for high-performance lithium-ion batteries. This organic material offers superior lithium storage capacity and exceptional cycling stability compared to current inorganic options.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Current lithium-ion battery (LIB) technologies predominantly use inorganic electrode materials.
- Organic electrode materials have faced limitations in thermal stability and specific capacity.
- Transition metal oxides offer high capacity via conversion reactions but exhibit poor cycling stability.
Purpose of the Study:
- To introduce a novel, high-performance organic lithium-storage material.
- To address the limitations of existing inorganic and organic LIB electrode materials.
- To develop a material with high lithium storage capacity and excellent cycling stability.
Main Methods:
- Electrochemical fabrication of a polypyrrole-cobalt-oxygen (PPy-Co-O) coordination complex.
- Characterization using Extended X-ray absorption fine structure (EXAFS) and Raman spectroscopy.
- Density functional theory (DFT) calculations to elucidate the coordination structure.
Main Results:
- The PPy-Co-O complex was successfully electrochemically fabricated by cycling PPy-coated Co(3)O(4) between 0.0 V and 3.0 V.
- DFT calculations revealed cobalt atoms coordinated with nitrogen in PPy-Co layers, linked by oxygen.
- Coordination was shown to weaken C-H bonds on polypyrrole, enhancing lithium storage properties.
Conclusions:
- The PPy-Co-O coordination complex represents a novel organic material for advanced lithium-ion batteries.
- This material demonstrates high lithium storage capacity and excellent cycling stability.
- The findings suggest a promising new direction for organic electrode materials in energy storage.
