Non-aqueous electrolyte secondary battery and manufacturing method thereof
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsHiroshi Onizuka, Tomohiro Nakano, Kyoko Kikuchi
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Abstract
A non-aqueous electrolyte secondary battery according to the present invention includes a positive electrode, a negative electrode, and a non-aqueous electrolyte solution. The negative electrode includes a coating derived from lithium bis(oxalate)borate. The coating derived from lithium bis(oxalate)borate includes a coating containing boron element and a coating containing oxalate ion. A ratio of the boron element contained in the coating derived from lithium bis(oxalate)borate to the oxalate ion is equal to or more than 5. Accordingly, it is possible to provide a non-aqueous electrolyte secondary battery capable of reliably obtaining the effect due to the formation of a coating.
Claims14
A non-aqueous electrolyte secondary battery, comprising:
- a positive electrode;
- a negative electrode;
- and
- a non-aqueous electrolyte solution, wherein
- the negative electrode includes a coating,
- the coating contains
- a compound containing boron element, the compound being represented by the following formula:
- and
- an oxalate ion, and
- a ratio of the boron element to the oxalate ion is equal to or more than 5.
A method of manufacturing a non-aqueous electrolyte secondary battery including a positive electrode, a negative electrode, and a non-aqueous electrolyte solution, the method comprising:
- adding lithium bis(oxalate)borate to the non-aqueous electrolyte solution;
- and
- performing a conditioning process for charging and discharging the non-aqueous electrolyte secondary battery to form a coating containing a compound containing boron element and oxalate ion, wherein the compound containing boron element and oxalate ion are products of the reductive decomposition of the lithium bis(oxalate)borate on the negative electrode, a ratio of boron element contained in the coating to oxalate ion contained in the coating being set to 5 or more, wherein the compound is represented by the following formula:
Dependencies are inferred from the claim text.