Magnesium-based methods, systems, and devices

Patent metadata

Field	Value
Publication number	US-9843080-B2
Application number	US-201514685428-A
Country	US
Kind code	B2
Filing date	Apr 13, 2015
Priority date	Apr 11, 2014
Publication date	Dec 12, 2017
Grant date	Dec 12, 2017

Abstract

An aspect of the present invention is an electrical device, where the device includes a current collector and a porous active layer electrically connected to the current collector to form an electrode. The porous active layer includes MgB x particles, where x≧1, mixed with a conductive additive and a binder additive to form empty interstitial spaces between the MgB x particles, the conductive additive, and the binder additive. The MgB x particles include a plurality of boron sheets of boron atoms covalently bound together, with a plurality of magnesium atoms reversibly intercalated between the boron sheets and ionically bound to the boron atoms.

First claim

The invention claimed is:

1. An electrical device comprising:
a current collector;
a liquid electrolyte comprising magnesium tetrahydroborate; and
an active layer electrically connected to the current collector to form an anode, wherein:
the active layer comprises a plurality of particles, a conductive additive, and a binder additive,
the plurality of particles are present at a first amount between 50 wt % and 70 wt %, the conductive additive is at a second amount between 10 wt % and 30 wt %, and the binder additive is at a third amount of less than or equal to 40 wt %,
the plurality of particles, the conductive additive, and the binder additive form a plurality of interstitial spaces within the active layer,
a portion of the liquid electrolyte is positioned within and fills at least a portion of the plurality of interstitial spaces,
the plurality of particles have a first state comprising at least two boron sheets with a plurality of magnesium atoms intercalated between the boron sheets resulting in a first composition MgB 2 ,
the plurality of particles have a second state comprising the at least two boron sheets and a fraction, 1−y, of the plurality of magnesium atoms intercalated between the boron sheets resulting in a second composition Mg (1-y) B 2 , where 0<y≦1,
while in the second state, the liquid electrolyte contains at least y Mg 2+ cations, and
the electrical device is capable of reversibly switching between the first state and the second state.

2. The electrical device of claim 1 further comprising:
a cathode, wherein:
the anode and the cathode are immersed in the liquid electrolyte.

3. The electrical device of claim 2 , wherein the cathode comprises vanadium oxide.

4. The electrical device of claim 1 , wherein the conductive additive comprises acetylene black.

5. The electrical device of claim 1 , wherein the binder additive comprises polyvinylidene fluoride.

6. The electrical device of claim 1 , wherein the current collector comprises at least one of aluminum, copper, gold, or silver.

7. The electrical device of claim 1 , wherein the liquid electrolyte further comprises dimethoxyethane.

Assignees

• Alliance Sustainable Energy

Inventors

• Zhao Yufeng
• Ban Chunmei
• Ruddy Daniel
• Parilla Philip A
• Son Seoung-Bum

Classifications

• H01M2300/0025

  Organic electrolyte · CPC title

• H01M10/0569

  characterised by the solvents · CPC title

• H01M4/136

  Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy · CPC title

• H01M2300/0028

  characterised by the solvent · CPC title

• H01M4/625

  Carbon or graphite · CPC title