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Lithium-ion Batteries from Metallurgical Grade Silicon Rocks
| Content Provider | The Lens |
|---|---|
| Description | Selon l'invention, une configuration d'anode en silicium poreux pour une batterie au lithium-ion permet d'atténuer sa croissance d'interphase à électrolyte solide (SEI) par bouchage des pores de surface, tout en permettant la nano-structuration afin d'empêcher la fracturation du silicium, ce qui augmente son efficacité et sa durée de vie. L'atténuation de la croissance de SEI peut permettre de réaliser une anode en silicium fiable constituée de silicium de qualité métallurgique qui est beaucoup moins coûteux que le silicium de qualité électronique, jusqu'à 10 fois moins coûteux. |
| Abstract | A porous silicon anode configuration for a lithium-ion battery allows to mitigate its solid-electrolyte interphase (SEI) growth by closing surface pores while still allowing for nano-structuration to prevent fracturing of silicon, thus increasing its efficiency and lifespan. Mitigation of the SEI growth can allow to make a reliable silicon anode made of metallurgical grade silicon which is much less costly than electronic grade silicon, up to 10 times less expensive. |
| Related Links | https://www.lens.org/images/patent/WO/2022120492/A1/WO_2022_120492_A1.pdf |
| Language | English |
| Publisher Date | 2022-06-16 |
| Access Restriction | Open |
| Alternative Title | Batteries Au Lithium-ion Fabriquées À Partir De Roches De Silicium De Qualité Métallurgique |
| Content Type | Text |
| Resource Type | Patent |
| Date Applied | 2021-12-10 |
| Agent | Anglehart, James Et Al. |
| Applicant | Socpra Sciences Et Genie Sec Centre Nat Rech Scient Univ Claude Bernard Lyon |
| Application No. | 2021051780 |
| Claim | What is claimed is A lithium battery anode comprising: porous silicon having a bulk porosity greater than 30%, a matrix between pores having dimensions less than 200 nm in two of said dimensions and closed surface pores. The anode as defined in claim 1, wherein said porous silicon is metallurgical grade silicon. The anode as defined in claim 1 or 2, wherein said matrix between pores has average dimensions less than 150 nm in two of said dimensions. The anode as defined in claim 1 to 3, wherein said porous silicon is fabricated by electrochemical etching. The anode as defined in claim 1 to 4, wherein an electrochemical etching solution containing silicon is electroplated to form electroplated silicon, said porous silicon being fabricated from said electroplated silicon. The anode as defined in any one of claims 1 to 5, wherein said closed surface pores are closed through rapid thermal annealing of said porous silicon. The anode as defined in claim 6, wherein said annealing of said porous silicon is between 600°C and 900°C. The anode as defined in claim 6, wherein said annealing of said porous silicon is between 800°C and 1000°C. The anode as defined in any one of claims 1 to 8, wherein said porous silicon is processed to form particles, wherein said particles are microparticles, nanoparticles, macroparticles, pillarshaped particles, tubular shaped particles, spherical shaped particles, or a combination thereof. The anode as defined in any one of claims 1 to 9, wherein said porous silicon is processed to form particles of size between about 100 nm and about 10pm. The anode as defined in any one of claims 9 or 10, wherein said particles are mixed with an additive for improving conductivity of the anode.. The anode as defined in claim 11, wherein said additive includes a carbon materia The anode as defined in any one of claims 1 to 12, wherein said closed surface pores are closed using a carbon coating on said porous silicon. The anode as defined in any one of claims 1 to 13, wherein said porous silicon is microporous, mesoporous, macropores, or a combination thereof. The anode as defined in any one of claims 1 to 14, wherein said bulk porosity is between 30% and 80%. The anode as defined in any one of claims 1 to 15, wherein said bulk porosity is between 40% and 60%. The anode as defined in any one of claims 1 to 16, wherein said closed surface pores are closed by adding silicon on the surface of said porous silicon. A battery cell comprising: a cathode; an electrolyte; and an anode comprising porous silicon having a matrix between pores configured to prevent said porous silicon from cracking and said porous silicon having surface pores configured to reduce growth of solid electrolyte interface within said porous silicon. The battery cell as defined in claim 18, wherein said anode comprises the anode as defined in any one of claims 1 to 17. The battery cell as defined in claim 19, wherein a Coulombic efficiency is of less than 65% is improved to more than 70% by closing said surface pores. |
| CPC Classification | Processes Or Means; E.G. Batteries; For The Direct Conversion Of Chemical Energy Into Electrical Energy |
| Extended Family | 053-303-723-336-503 |
| Patent ID | 2022120492 |
| Inventor/Author | Aziziyan Mohammad Reza Boucherif Abderraouf Machon Denis Abdelouhab Sofiane |
| IPC | H01M4/134 H01M4/1395 H01M10/0525 |
| Status | Pending |
| Simple Family | 053-303-723-336-503 |
| CPC (with Group) | H01M4/134 H01M4/1395 H01M4/366 H01M10/0525 H01M10/4235 |
| Issuing Authority | World Intellectual Property Organization (WIPO) |
| Kind | Patent Application Publication |
