US 12,080,887 B2
Iron-based cathode material for sodium-ion battery, preparation method thereof, and corresponding sodium-ion full battery
Jianqing Zhao, Suzhou (CN); Shiyu Li, Suzhou (CN); and Lijun Gao, Suzhou (CN)
Assigned to SUZHOU GAOBO ENERGY STORAGE SCITECH CO., LTD., Suzhou (CN)
Appl. No. 17/251,909
Filed by SUZHOU GAOBO ENERGY STORAGE SCITECH CO., LTD., Suzhou (CN)
PCT Filed Dec. 25, 2019, PCT No. PCT/CN2019/128296
§ 371(c)(1), (2) Date Dec. 14, 2020,
PCT Pub. No. WO2021/114401, PCT Pub. Date Jun. 17, 2021.
Claims priority of application No. 201911251387.7 (CN), filed on Dec. 9, 2019; and application No. 201911252756.4 (CN), filed on Dec. 9, 2019.
Prior Publication US 2021/0202946 A1, Jul. 1, 2021
Int. Cl. H01M 4/58 (2010.01); H01M 4/04 (2006.01); H01M 4/36 (2006.01); H01M 4/587 (2010.01); H01M 4/62 (2006.01); H01M 10/054 (2010.01); H01M 10/0567 (2010.01); H01M 10/0568 (2010.01); H01M 10/0569 (2010.01); H01M 10/058 (2010.01)
CPC H01M 4/5825 (2013.01) [H01M 4/0404 (2013.01); H01M 4/0471 (2013.01); H01M 4/364 (2013.01); H01M 4/582 (2013.01); H01M 4/587 (2013.01); H01M 4/625 (2013.01); H01M 10/054 (2013.01); H01M 10/0567 (2013.01); H01M 10/0568 (2013.01); H01M 10/0569 (2013.01); H01M 10/058 (2013.01); H01M 2300/0037 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A method for preparing an iron-based cathode material for a sodium-ion battery comprising steps of:
S1: mixing anhydrous ferrous sulfate, sodium sulfate, and sodium fluoride at a molar ratio of 1:2:1 with a carbon-based material, followed by ball milling under a protective atmosphere, and drying the milled mixture to obtain a cathode material precursor; and
S2: under a sintering atmosphere, sintering the cathode material precursor at a temperature between 300 and 450°C. for a duration time between 1 and 24 h to obtain the iron-based cathode material,
wherein the iron-based cathode material comprises a Na3Fe2(SO4)3F material and a carbon-based material embedded into the bulk structure of the Na3Fe2(SO4)3F material, wherein in the iron-based cathode material, the weight percentage of the carbon-based material is ranked between 1% and 10%.