Hexacyanoferrate battery electrode modified with ferrocyanides or ferricyanides

A battery electrode and hexacyanohydrin technology, applied in the field of electrochemical batteries, can solve the problems of poor dissolution of TMHCF and shortened cycle life

Inactive Publication Date: 2015-12-16
SHARP KK
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Problems solved by technology

When alkali ions or basic ions are extracted from TMHCF, the di

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  • Hexacyanoferrate battery electrode modified with ferrocyanides or ferricyanides
  • Hexacyanoferrate battery electrode modified with ferrocyanides or ferricyanides
  • Hexacyanoferrate battery electrode modified with ferrocyanides or ferricyanides

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[0043] Disclosed herein is the use of ferrocyanide or ferricyanide as an additive in rechargeable batteries having transition metal hexacyanoferrate (TMHCF) electrodes, which improves the performance of said electrodes in non-aqueous electrolytes. Ferrocyanide or ferricyanide A x Fe(CN) 6 (x=3 or 4) dissociates into A + and Fe(CN) 6 3- or Fe(CN) 6 4- ion. These ions are able to push Equation 2 back, which prevents TMHCF from dissolving in non-aqueous electrolytes:

[0044] A x m y Fe z (EN) n .mH 2 O=xA a+ +y M b- +[Fe z (CN) n ] c- +mH 2 O. (2)

[0045] TMHCF can be expressed as A x m y Fe z (EN) n .mH 2O, A is selected from alkali metal or alkali metal, and wherein M can be one or several transition metals. As an additive, ferrocyanide or ferricyanide increases the capacity of TMHCF and its capacity retention.

[0046] Therefore, TMHCF battery electrodes have Fe(CN) 6 additive. The electrodes are covered by a current collector A x m y Fe z (EN)...

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Abstract

A transition metal hexacyanoferrate (TMHCF) battery electrode is provided with a Fe(CN)6 additive. The electrode is made from AxMyFez(CN)n.mH2O particles overlying a current collector, where the A cations are either alkali and alkaline-earth cations such as sodium (Na), potassium (K), calcium (Ca), or magnesium (Mg), and M is a transition metal. A Fe(CN)6 additive modifies the AxMyFez(CN)n.mH2O particles. The Fe(CN)6 additive may be ferrocyanide ([Fe(CN)6]4-) or ferricyanide ([Fe(CN)6]3-). Also provided are a related TMHCF battery with Fe(CN)6 additive, TMHCF fabrication process, and TMHCF battery fabrication process.

Description

technical field [0001] The present invention relates generally to electrochemical cells, and more particularly to a battery having Fe(CN) 6 Additives for transition metal hexacyanoferrate (TMHCF) battery electrodes and related fabrication methods. Background technique [0002] A battery is an electrochemical cell by which chemical energy and electrical energy are converted back and forth. The energy density of a battery is determined by its voltage and charge capacity. Li vs. H 2 / H + Has the most negative potential of -3.04V, and has the highest gravimetric capacity of 3860 milliamp hours per gram (mAh / g). Due to their high energy density, lithium-ion batteries have ushered in a revolution in portable electronic devices. However, the high cost of lithium metal makes the commercialization of lithium batteries as large-scale energy storage devices questionable. Additionally, the demand for lithium and its reserves as a mineral has created the need to construct other typ...

Claims

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Application Information

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IPC IPC(8): H01M4/136H01M4/1397H01M4/58H01M4/62H01M10/054H01M10/0566H01M10/0567H01M10/058
CPCH01M4/136H01M4/1397H01M4/58H01M4/621H01M4/625H01M10/054H01M10/0567H01M10/0568H01M10/0569Y02E60/10Y02P70/50
Inventor 鲁宇浩李宗霑大卫·埃文斯
Owner SHARP KK
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