Efficient Preparation of Li<sub>2</sub>FeSiO<sub>4</sub>/C with High Purity and Excellent Electrochemical Performance in Li-Ion Batteries
One method to enhance the electrochemical performance of carbon-coated Li<sub>2</sub>FeSiO<sub>4</sub> cathode material in lithium-ion batteries is to produce an ideal Li<sub>2</sub>FeSiO<sub>4</sub> precursor with minimal impurities. A novel precursor...
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2025-02-01
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| author | Jinhai Cui Dezhi Chen Mengna Xie Yongheng Zhou Shuai Dong Wei Wei |
| author_facet | Jinhai Cui Dezhi Chen Mengna Xie Yongheng Zhou Shuai Dong Wei Wei |
| author_sort | Jinhai Cui |
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| description | One method to enhance the electrochemical performance of carbon-coated Li<sub>2</sub>FeSiO<sub>4</sub> cathode material in lithium-ion batteries is to produce an ideal Li<sub>2</sub>FeSiO<sub>4</sub> precursor with minimal impurities. A novel precursor for Li<sub>2</sub>FeSiO<sub>4</sub> (Li<sub>2</sub>O·FeCO<sub>3</sub>·CH<sub>3</sub>OSiO<sub>2</sub>H) was synthesized through a methanol solvothermal reaction under stringent conditions (180 °C and 2.7 MPa), achieving a purity level of 93.2%. During synthesis, the new Li<sub>2</sub>FeSiO<sub>4</sub> precursor exhibits unique self-purification properties and maintains a fine morphology after annealing. The resulting carbon-coated Li<sub>2</sub>FeSiO<sub>4</sub> composites demonstrate a Brunauer–Emmett–Teller specific surface area of 102.4 m<sup>2</sup>/g and approximately 81% mesoporous volume, with 90% of the pore sizes measuring less than 39 nm. As a cathode material for lithium-ion batteries, this carbon-coated Li<sub>2</sub>FeSiO<sub>4</sub> exhibits initial specific capacities of 172.3 mAh/g (charge) and 159.3 mAh/g (discharge). Remarkably, nearly 50% of the theoretical specific capacity remains after 1300 cycles at a rate of 0.1 C. The excellent electrochemical performance of the carbon-coated Li<sub>2</sub>FeSiO<sub>4</sub> materials is demonstrated by their high lithium-ion diffusivity (D<sub>Li+</sub>) value of 1.26 × 10<sup>−11</sup> cm<sup>2</sup>/s. Additionally, the enormous capacities-controlled diffusion contribution, which accounts for 70% of the total diffusion at a rate of 1C, is noteworthy. This performance can be attributed to the high purity of the carbon-free Li<sub>2</sub>FeSiO<sub>4</sub> composite, which contains 91% Li<sub>2</sub>FeSiO<sub>4</sub>, as well as its favorable morphology. |
| format | Article |
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| institution | DOAJ |
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| spelling | doaj-art-e0836b9a2adb4e149cfc0d6b8f7e6ff22025-08-20T03:12:09ZengMDPI AGMolecules1420-30492025-02-0130480810.3390/molecules30040808Efficient Preparation of Li<sub>2</sub>FeSiO<sub>4</sub>/C with High Purity and Excellent Electrochemical Performance in Li-Ion BatteriesJinhai Cui0Dezhi Chen1Mengna Xie2Yongheng Zhou3Shuai Dong4Wei Wei5Henan Engineering Center of New Energy Battery Materials, School of Chemistry and Chemical Engineering, Shangqiu Normal University, Shangqiu 476000, ChinaSchool of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, ChinaSchool of Petrochemical Engineering, Liaoning Petrochemical University, Fushun 113001, ChinaSchool of Material and Chemical Engineering, Kaifeng University, Kaifeng 475000, ChinaHenan Engineering Center of New Energy Battery Materials, School of Chemistry and Chemical Engineering, Shangqiu Normal University, Shangqiu 476000, ChinaHenan Engineering Center of New Energy Battery Materials, School of Chemistry and Chemical Engineering, Shangqiu Normal University, Shangqiu 476000, ChinaOne method to enhance the electrochemical performance of carbon-coated Li<sub>2</sub>FeSiO<sub>4</sub> cathode material in lithium-ion batteries is to produce an ideal Li<sub>2</sub>FeSiO<sub>4</sub> precursor with minimal impurities. A novel precursor for Li<sub>2</sub>FeSiO<sub>4</sub> (Li<sub>2</sub>O·FeCO<sub>3</sub>·CH<sub>3</sub>OSiO<sub>2</sub>H) was synthesized through a methanol solvothermal reaction under stringent conditions (180 °C and 2.7 MPa), achieving a purity level of 93.2%. During synthesis, the new Li<sub>2</sub>FeSiO<sub>4</sub> precursor exhibits unique self-purification properties and maintains a fine morphology after annealing. The resulting carbon-coated Li<sub>2</sub>FeSiO<sub>4</sub> composites demonstrate a Brunauer–Emmett–Teller specific surface area of 102.4 m<sup>2</sup>/g and approximately 81% mesoporous volume, with 90% of the pore sizes measuring less than 39 nm. As a cathode material for lithium-ion batteries, this carbon-coated Li<sub>2</sub>FeSiO<sub>4</sub> exhibits initial specific capacities of 172.3 mAh/g (charge) and 159.3 mAh/g (discharge). Remarkably, nearly 50% of the theoretical specific capacity remains after 1300 cycles at a rate of 0.1 C. The excellent electrochemical performance of the carbon-coated Li<sub>2</sub>FeSiO<sub>4</sub> materials is demonstrated by their high lithium-ion diffusivity (D<sub>Li+</sub>) value of 1.26 × 10<sup>−11</sup> cm<sup>2</sup>/s. Additionally, the enormous capacities-controlled diffusion contribution, which accounts for 70% of the total diffusion at a rate of 1C, is noteworthy. This performance can be attributed to the high purity of the carbon-free Li<sub>2</sub>FeSiO<sub>4</sub> composite, which contains 91% Li<sub>2</sub>FeSiO<sub>4</sub>, as well as its favorable morphology.https://www.mdpi.com/1420-3049/30/4/808methanol solvothermal methodthe new LFS precursoratom utility efficiencyLFS/C compositescharging–discharging performance |
| spellingShingle | Jinhai Cui Dezhi Chen Mengna Xie Yongheng Zhou Shuai Dong Wei Wei Efficient Preparation of Li<sub>2</sub>FeSiO<sub>4</sub>/C with High Purity and Excellent Electrochemical Performance in Li-Ion Batteries Molecules methanol solvothermal method the new LFS precursor atom utility efficiency LFS/C composites charging–discharging performance |
| title | Efficient Preparation of Li<sub>2</sub>FeSiO<sub>4</sub>/C with High Purity and Excellent Electrochemical Performance in Li-Ion Batteries |
| title_full | Efficient Preparation of Li<sub>2</sub>FeSiO<sub>4</sub>/C with High Purity and Excellent Electrochemical Performance in Li-Ion Batteries |
| title_fullStr | Efficient Preparation of Li<sub>2</sub>FeSiO<sub>4</sub>/C with High Purity and Excellent Electrochemical Performance in Li-Ion Batteries |
| title_full_unstemmed | Efficient Preparation of Li<sub>2</sub>FeSiO<sub>4</sub>/C with High Purity and Excellent Electrochemical Performance in Li-Ion Batteries |
| title_short | Efficient Preparation of Li<sub>2</sub>FeSiO<sub>4</sub>/C with High Purity and Excellent Electrochemical Performance in Li-Ion Batteries |
| title_sort | efficient preparation of li sub 2 sub fesio sub 4 sub c with high purity and excellent electrochemical performance in li ion batteries |
| topic | methanol solvothermal method the new LFS precursor atom utility efficiency LFS/C composites charging–discharging performance |
| url | https://www.mdpi.com/1420-3049/30/4/808 |
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