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Electrically conductive nanocomposite material and open porous nanocomposites produced by the same

一种纳米复合物、电极材料的技术，应用在电极制造、化学电极制造、电路等方向，能够解决低比电荷、不稳定等问题

Active Publication Date: 2011-08-03
THE SWATCH GRP RES & DEVELONMENT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it has been found that these oxides generally have a spinel structure, which results in these oxides having a lower specific charge or being less stable under cycling with respect to lithium exchange

Method used

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  • Electrically conductive nanocomposite material and open porous nanocomposites produced by the same
  • Electrically conductive nanocomposite material and open porous nanocomposites produced by the same
  • Electrically conductive nanocomposite material and open porous nanocomposites produced by the same

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Embodiment Construction

[0055] The inventive system LiFePO will now be further described 4 and PEDOT as well as sacrificial nanoparticles and conductive filler particles (including nanofibers). This complex (ie the intermediate complex) and the final complex are schematically shown in FIG. 1 .

[0056] LiFePO 4 is a very promising EAM because it can be made from inexpensive precursors, has a nontoxic nature, is environmentally compatible, and has remarkable chemical and thermal stability. This material exceptionally helps to accelerate the mobility of lithium ions making it useful for high-power applications [3]. However, the low intrinsic electronic conductivity of this material severely limits its electrochemical response [3]. Various attempts have been made to improve its properties, such as reducing its particle size [4-6], coating with ultra-thin carbon, doping with hypervalent ions [7,8], adding metal particles to the electrode composite [9] are some of these methods, all of which failed to...

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Abstract

The invention relates to an electrically conductive nanocomposite material comprising sacrificial nanoparticles and an open porous nanocomposites produced by the same. Nanocomposits formed by conductive nanoparticulate polymers and electronically active materials (in particular PEDOT and LiFePO4) are found to be significantly better than bare LiFePO4 and carbon coated LiFePO4, wherein the carbon coated LiFePO4 is in nonconducting binders filled with carbon black and graphite. The composite containing conductive polymers outperforms the other two samples. The performance of the PEDOT composite is especially better in the high current regime with capacity retention of 82% after 200 cycles. Further improvement can be obtained if the porosity of the nanocomposit is enhanced. Hence an electrode is disclosed which is produced by a composite made of conductive nanoparticulate polymers, electronically active materials, and sacrificial polymers, wherein the sacrificial polymers are removed and pores are left which improve diffusion properties of electrolytes and ions and allow the production of thicker electrodes.

Description

technical field [0001] The present invention relates to an electrode material for electrodes of rechargeable lithium batteries based on nanoparticulate lithium compounds contained in nanocomposites. The invention also relates to a method of producing such an electrode material. Background technique [0002] Rechargeable lithium batteries are used in particular in portable electronic equipment, such as telephones, computers, and video equipment, and more recently in vehicles, such as electric bicycles and automobiles. These applications place high demands on these batteries. In particular, they should store the most energy for a given volume or weight. They should also be reliable and compatible with the environment. Therefore, high energy density and high specific energy are two essential requirements especially for electrode materials of such batteries. [0003] Another important requirement for such electrode materials is cycle resistance. Here, each cycle includes a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/62
CPCH01M4/5825H01M4/0471H01M4/622Y02T10/7011H01M4/049H01M10/052H01M4/134Y02E60/122H01M4/621H01M4/043H01M4/625H01M4/366H01M4/136Y02E60/10
Inventor J·格鲁普
Owner THE SWATCH GRP RES & DEVELONMENT LTD