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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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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When alkali ions or basic ions are extracted from TMHCF, the dissolution of TMHCF becomes poor and the cycle life is shortened

Method used

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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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Embodiment Construction

[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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