# US 10,483,527 B2 · Cathode material for rechargeable magnesium battery and method for preparing the same

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- Number: US 10,483,527 B2
- Document ID: US10483527B2
- Status: Granted
- Kind: B2
- Application number: 15/486,201
- Filed: 2017-04-12
- Published: 2018-05-17
- Granted: 2019-11-19
- Earliest claimed: 2016-11-17
- Assignees: Korea Institute of Science and Technology
- Applicants: Korea Institute of Science and Technology
- Inventors: Si Hyoung Oh; Byung Won Cho; Won Young Chang; Jung Hoon Ha; Boeun Lee; Hyo Ree Seo
- Web page: https://patentgrep.com/patent/US10483527B2

## CPC

- H01M 4/364: {as mixtures}
- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M 4/381: {Alkaline or alkaline earth metals elements (H01M4/40 takes precedence)}
- H01M 4/5815: {Sulfides}
- H01M 4/623: {fluorinated polymers}
- H01M 4/625: {Carbon or graphite}
- H01M 10/054: Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
- H01M 10/0568: characterised by the solutes
- H01M 10/0569: characterised by the solvents
- H01M 2004/028: {Positive electrodes}
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

Provided is a cathode material for a rechargeable magnesium battery, represented by the chemical formula of Ag2SxSe1-x (0≤x≤1), a highly stable cathode material and a rechargeable magnesium battery including the same. The cathode material for a rechargeable magnesium battery has a higher discharge capacity and higher discharge voltage as compared to a typical commercially available cathode material, Chevrel phase, and shows excellent stability in an electrolyte for a rechargeable magnesium battery including chloride ions. In addition, after evaluating the cycle life of the cathode material, the cathode material shows an excellent discharge capacity per unit weight after 500 charge/discharge cycles, and thus is useful for a cathode material for a rechargeable magnesium battery.

## Claims

### Claim 1

A cathode material for a rechargeable magnesium battery, represented by the following Chemical Formula 1:
Ag2SxSe1-x [Chemical Formula 1]
wherein x is a real number and satisfies 0<x<1, Ag2SxSe1-x comprises a solid solution of Ag2S and Ag2Se.

### Claim 2 (depends on 1)

A cathode for a rechargeable magnesium battery, which comprises the cathode material for a rechargeable magnesium battery as defined in claim 1.

### Claim 3 (depends on 1)

A cathode for a rechargeable magnesium battery, which comprises a nanocomposite of the cathode material for a rechargeable magnesium battery as defined in claim 1 with carbon black.

### Claim 4 (depends on 3)

The cathode for a rechargeable magnesium battery according to claim 3, wherein the weight ratio of the cathode material for a rechargeable magnesium battery to carbon black contained in the composite is 99-0.5:1.

### Claim 5 (depends on 3)

A rechargeable magnesium battery comprising the cathode for a rechargeable magnesium battery as defined in claim 3.

### Claim 6 (depends on 5)

The rechargeable magnesium battery according to claim 5, which further comprises an electrolyte containing both a lithium salt and a magnesium salt.

### Claim 7 (depends on 6)

An electrochemical product comprising the rechargeable magnesium battery as defined in claim 6, which is selected from an electric vehicle, hybrid electric vehicle, energy storage system and a power supply system for emergency.

### Claim 8 (depends on 4)

A rechargeable magnesium battery comprising the cathode for a rechargeable magnesium battery as defined in claim 4.