US2023178864A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2023178864-A1 |
| Application number | US-202218060791-A |
| Country | US |
| Kind code | A1 |
| Filing date | Dec 1, 2022 |
| Priority date | Dec 3, 2021 |
| Publication date | Jun 8, 2023 |
| Grant date | — |
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A rechargeable lithium battery includes: a positive electrode; a negative electrode; a separator between the positive electrode and the negative electrode; an electrolyte including vinylene carbonate; and a case accommodating the positive electrode, the negative electrode, the separator, and the electrolyte. At least in a portion of an interior of the case has a coating portion containing lithium borate particles.
Opening claim text (preview).
What is claimed is: 1 . A rechargeable lithium battery comprising a positive electrode; a negative electrode; a separator between the positive electrode and the negative electrode; an electrolyte comprising vinylene carbonate; and a case accommodating the positive electrode, the negative electrode, the separator, and the electrolyte, at least in a portion of an interior of the case has a coating portion containing lithium borate particles. 2 . The rechargeable lithium battery of claim 1 , wherein in the rechargeable lithium battery, an amount of gas generated per battery weight is greater than or equal to about 1.0 cc/g in a 5.0 V overcharge evaluation. 3 . The rechargeable lithium battery of claim 1 , wherein the case comprises an overcharge safety device. 4 . The rechargeable lithium battery of claim 3 , wherein the overcharge safety device is configured to operate when an internal pressure inside the case is greater than or equal to 7 kgf/cm 2 . 5 . The rechargeable lithium battery of claim 3 , wherein the overcharge safety device is configured to induce a circuit opening when an internal pressure of the battery exceeds a reference value. 6 . The rechargeable lithium battery of claim 3 , wherein the overcharge safety device is configured to induce a short circuit when an internal pressure of the battery exceeds a reference value. 7 . The rechargeable lithium battery of claim 1 , wherein the lithium borate particle comprises LiBO 2 , Li 3 B 7 O 12 , Li 6 B 4 O 9 , Li 3 B 11 O 18 , Li 2 B 4 O 7 , Li 3 BO 3 , Li 8 B 6 O 13 , Li 5 B 3 O 7 , Li 4 B 2 O 5 , Li 10 B 4 O 11 , Li 8 B 2 O 7 , or a combination thereof. 8 . The rechargeable lithium battery of claim 1 , wherein an average particle diameter of the lithium borate particles is less than or equal to 10 µm. 9 . The rechargeable lithium battery of claim 1 , wherein the coating portion contacts the electrolyte. 10 . The rechargeable lithium battery of claim 1 , wherein the coating portion is on at least one of an inner wall of the case and a cap plate. 11 . The rechargeable lithium battery of claim 1 , wherein the vinylene carbonate is included in an amount of about 0.1 wt% to about 5 wt% based on a total weight of the electrolyte. 12 . The rechargeable lithium battery of claim 1 , wherein the positive electrode comprises a positive electrode active material, the positive electrode active material comprising particles comprising a lithium transition metal composite oxide, and a boron coating layer on the surface of the particles. 13 . The rechargeable lithium battery of claim 12 , wherein the boron coating layer comprises lithium borate and the lithium borate comprises LiBO 2 , Li 3 B 7 O 12 , Li 6 B 4 O 9 , Li 3 B 11 O 18 , Li 2 B 4 O 7 , Li 3 BO 3 , Li 8 B 6 O 13 , Li 5 B 3 O 7 , Li 4 B 2 O 5 , Li 10 B 4 O 11 , Li 8 B 2 O 7 , or a combination thereof.
as layered products · CPC title
characterised by the internal coating on the casing · CPC title
Inorganic material · CPC title
Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines · CPC title
of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title
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