# US 2021/0242462 A1 · Method of Manufacturing Biomass Hard Carbon for Negative Electrode of Sodium-ion Batteries and Sodium-ion Batteries Containing Biomass Hard Carbon Thereof

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- Number: US 2021/0242462 A1
- Document ID: US20210242462A1
- Status: Published application
- Kind: A1
- Application number: 16/833,889
- Filed: 2020-03-30
- Published: 2021-08-05
- Earliest claimed: 2020-02-04
- Assignees: CPC Corporation, Taiwan
- Applicants: CPC Corporation, Taiwan
- Inventors: Tzu-Hsien Hsieh; Haw-Yeu Chuang; Yang-Chuang Chang; Wei-Jen Liu; Rasu Muruganantham
- Web page: https://patentgrep.com/patent/US20210242462A1

## CPC

- H01M 4/583: Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/587: for inserting or intercalating light metals
- C01B 32/05: Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/1393: of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/622: {being polymers}
- H01M 4/623: {fluorinated polymers}
- H01M 10/054: Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
- H01M 2004/027: {Negative 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
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A method of manufacturing biomass hard carbon contains: step 1: mixing a carbon source and a nanoscale powder so as to obtain a precursor; step 2: disposing the precursor in an oxygen-free environment; step 3: carbonizing the precursor by a heating process so as to make the precursor be transformed into a hard carbon mixture; step 4: rinsing the hard carbon mixture by an acid solution, such that the hard carbon mixture has a pH value less than 0.5; step 5: modulating the pH value to be greater than 6 by using a pure water to rinse the hard carbon mixture; and step 6: producing a biomass hard carbon by drying the hard carbon mixture.

## Claims

### Claim 1

A method of manufacturing biomass hard carbon, comprising:
(1) mixing a carbon source and a nanoscale powder so as to obtain a precursor;
(2) disposing the precursor in an oxygen-free environment;
(3) carbonizing the precursor by a heating process, so as to make the precursor be transformed into a hard carbon mixture;
(4) rinsing the hard carbon mixture by an acid solution, such that the hard carbon mixture has a pH value less than 0.5;
(5) modulating the pH value to be greater than 6 by using a pure water to rinse the hard carbon mixture; and
(6) producing a biomass hard carbon by drying the hard carbon mixture.

### Claim 2 (depends on 1)

The method of claim 1, wherein the carbon source is a bio-oil that is selected from the group consisting of cracked oil and coke oil.

### Claim 3 (depends on 2)

The method of claim 2, wherein the carbon source is obtained by applying a thermochemical conversion process to a bio-waste, and the thermochemical conversion process is selected from the group consisting of carbonizing process, pyrolysis process and gasifying process.

### Claim 4 (depends on 1)

The method of claim 1, wherein the nanoscale power is material that is selected from the group consisting of calcium carbonate, zinc oxide, iron oxide, calcium phosphate, and a combination of the forgoing two or more materials.

### Claim 5 (depends on 1)

The method of claim 1, wherein the nanoscale power comprising a plurality of nanoparticles having a particle size in a range between 20 nm and 80 nm.

### Claim 6 (depends on 1)

The method of claim 1, wherein the nanoscale power in the precursor has a weight percent in a range between 0 and 50.

### Claim 7 (depends on 1)

The method of claim 1, wherein the heating process comprises a first heating stage and a second heating stage, such that the precursor is treated by a first processing temperature in a range between 350° C. and 450° C. in the first heating stage, and is subsequently treated by a second processing temperature in a range between 800° C. and 1,200° C. in the second heating stage.

### Claim 8 (depends on 1)

The method of claim 1, wherein the biomass hard carbon is further processed to a negative electrode of a sodium-ion battery.

### Claim 9 (depends on 8)

The method of claim 8, wherein an adhesive agent is added into the biomass hard carbon, and the adhesive agent is made of a material that is selected from the group consisting of carboxymethyl cellulose, styrene-butadiene rubber and polyvinylidene fluoride.

### Claim 10 (depends on 9)

The method of claim 9, wherein the adhesive agent in the biomass hard carbon has a weight percent in a range between 10 and 15.