Anode material of lithium-ion secondary battery and preparation method thereof
AssigneeLong Time Technology Corp., LTD.
InventorsYu-Shiang Wu, Shian-Tsung Chou, Po-kun Chen
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Abstract
In an anode material of a lithium-ion secondary battery and its preparation method, a natural graphite, an artificial graphite or both are mixed to form a graphite powder, and the graphite powder is mixed with a resin of a high hard carbon content and processed by a mist spray drying process, and finally added or coated with a special resin material after a carburizing heat treatment takes place to prepare a graphite composite of the anode material of the lithium-ion secondary battery and achieve a smaller surface area of an anode graphite composite of the battery and extended cycle life and capacity.
Claims8
An anode material of a lithium-ion secondary battery, comprising a graphite powder mixed from a natural graphite, an artificial graphite or both, a first resin having a hard carbon content therein and mixed with the graphite powder by a mist spray drying process, and a second resin material further mixed with the mixed graphite powder and the first resin after a carbonization heat treatment on the mixed graphite powder and the first resin takes place to prepare a graphite composite of the anode material of the lithium-ion secondary battery;
- wherein the first resin is one selected from the collection of an urea resin, a polyester resin, a polyamide resin and a melamine resin.
A preparation method of an anode material of a lithium-ion secondary battery, comprising the steps of:
- mixing a natural graphite, an artificial graphite or both to form a graphite powder;
- mixing the graphite powder with a first resin of a hard carbon content into a paste, and processed by a mist spray drying process to form a powder, and putting the powder into a carbonization furnace for a heat treatment;
- passing nitrogen gas (N2) into the carbonization furnace to provide a protection environment during the heat treatment, wherein the temperature required for the heat treatment rises to 900˜1200° C., and the temperature rising time is 1˜10° C./min, and the temperature holding time is 1˜5 hr, and removing the powder after the heat treatment is completed;
- and
- adding, blending and mixing the powder into a second resin solution, and heating and drying the solution at a heating and drying temperature of 100˜200° C. and a drying time of 30˜120 minutes to obtain a graphite composite powder used as the anode material of the lithium-ion secondary battery.
Dependencies are inferred from the claim text.