Metal-doped transition metal hexacyanoferrate (TMHCF) battery electrode

A metal doping, battery electrode technology, applied in the field of electrochemical batteries, can solve the problems of small capacity and reducing the concentration of mobile ions, etc.

Inactive Publication Date: 2015-12-23
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The interstitial space of TMHCF occupied by water molecules reduces the concentration of mobile ions i

Method used

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  • Metal-doped transition metal hexacyanoferrate (TMHCF) battery electrode
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  • Metal-doped transition metal hexacyanoferrate (TMHCF) battery electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Example 1: Al 0.05 mn 0.95 -HCF

[0063] Solution 1 is Na 4 Fe(CN) 6 of aqueous solution. Solution 2 contains Mn 2+ and Al 3+ ion. Slowly drop solution 2 into solution 1 to form Al 0.05 mn 0.95 - Precipitation of HCF. After separation, washing and drying, the Al 0.05 mn 0.95 -HCF is used as an electrode in a sodium-ion battery with saturated NaClO 4 Ethylene carbonate / diethyl carbonate (EC / DEC) electrolyte. For comparison, Mn-HCF was synthesized under the same conditions.

[0064] Figure 5A and Figure 5B is Mn-HCF doped with aluminum (Al 0.05 mn 0.95 -HCF) electrode compared with Mn-HCF (undoped) electrode. The capacity was normalized by the maximum capacity of the Mn-HCF electrode during the first discharge. Figure 5A depicts the Mn-HCF and Al 0.05 mn 0.95 - Comparison of charge / discharge curves of HCF electrodes. Using Al 3+ Ion doping increased the capacity of the Mn-HCF electrode by about 15%. The electrodes were then cycled at currents of...

Embodiment 2

[0066] Example 2: NaKMn-HCF

[0067] Solution 1 contains Na 4 Fe(CN) 6 and K 4 Fe(CN) 6 . Solution 2 is Mn 2+The solution. Solution 1 and Solution 2 were mixed together to obtain NaKMn-HCF. For comparison, Mn-HCF was synthesized under the same conditions. NaKMn-HCF was evaluated as an electrode in a Na-ion battery with saturated NaClO 4 Ethylene carbonate / diethyl carbonate (EC / DEC) electrolyte.

[0068] Image 6 is a graph depicting the change in capacity of Mn-HCF and NaKMn-HCF electrodes cycled at different charge / discharge currents. Although the capacity of NaKMn-HCF is lower than that of Mn-HCF during the first cycle, it exhibits better capacity retention. After 100 cycles, the normalized capacity of KNaMn-HCF was 111%, but that of Mn-HCF at 0.1C was 91%. In other words, since K + The doping of ions increases the capacity retention by 20%. K + Ions greater than Na + ions, which support the structure of Mn-HCF and stabilize it during charge / discharge cycles....

Embodiment approach

[0081] US 13 / 897,492 is incorporated herein by reference.

[0082] One with Fe(CN) 6 An additive transition metal hexacyanoferrate (TMHCF) battery electrode comprising: a metal current collector; A covering the current collector x m y Fe z (CN) n .mH 2 O particles; wherein the A cation is selected from alkali metal cations and alkaline earth metal cations; wherein M is a transition metal; wherein x is 0-2; wherein y is 0-2; wherein z is 0.1-2; wherein n is 1-6; Wherein m is 0~7; And Fe(CN) 6 Additive pair A x m y Fe z (CN) n .mH 2 O particles are modified.

[0083] The TMHCF battery electrode, wherein Fe(CN) 6 Additives are selected from ferrocyanide ([Fe(CN) 6 ] 4- ) and ferricyanide ([Fe(CN) 6 ] 3- ).

[0084] The TMHCF battery electrode, wherein the A cation is selected from sodium (Na), potassium (K), calcium (Ca) and magnesium (Mg).

[0085] A kind of synthesis has Fe(CN) 6 A method for additive transition metal hexacyanoferrate (TMHCF) battery electrod...

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Abstract

A method is provided for synthesizing a metal-doped transition metal hexacyanoferrate (TMHCF) battery electrode. The method prepares a first solution of AxFe(CN)6 and Fe(CN)6, where A cations may be alkali or alkaline-earth cations. The method adds the first solution to a second solution containing M-ions and M'-ions. M is a transition metal, and M' is a metal dopant. Subsequent to stirring, the mixture is precipitated to form AxMcM'dFez(CN)n.mH2O particles. The AxMcM'dFez(CN)n.mH2O particles have a framework and interstitial spaces in the framework, where M and M' occupy positions in the framework. Alternatively, the method prepares AaA'bMyFez(CN)n.mH2O particles. A and A' occupy interstitial spaces in the AaA'bMyFez(CN)n.mH2O particle framework. A metal-doped TMHCF electrode is also provided.

Description

technical field [0001] The present invention relates generally to electrochemical cells, and more particularly to a metal-doped transition metal hexacyanoferrate (TMHCF) battery electrode and related methods of manufacture. 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 types of metal-ion batteries...

Claims

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Application Information

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IPC IPC(8): H01M4/58C01C3/12H01M4/136
CPCC01C3/12H01M4/136H01M4/1397H01M4/364H01M4/5825Y02E60/10
Inventor 鲁宇浩李宗霑大卫·埃文斯
Owner SHARP KK
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