CARBON-COATED Li5FeO4

• Main Authors: KIMIJIMA TAKEYUKI, EGUCHI TATSUYA, NIIMURA KAZUHIRO, IWATA KOJI, OKAWA YUKIHISA, ABE TOMOKUNI, TAZAKI TOMOYUKI, SAEKI AKIHIRO
• Format: Patent
• Language: English; Japanese
• Published: 06.06.2019
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide LiFeOuseful as a positive electrode of a lithium ion secondary battery or other related materials or the like.SOLUTION: There is provided a carbon-coated LiFeOcontaining LiFeO, a carbon film for coating the surface of the LiFeOand FeC. There is provided a carbon-coated LiFeOin which a diffraction peak derived from graphite is observed by an X-ray diffraction analysis using radiation light and the relation between the diffraction peak intensity (I) derived from LiFeOand the diffraction peak intensity (I) derived from FeC satisfies the following expression, 0<I/I<0.1.EFFECT: An excellent conductivity can be led and a sufficient capacity can be secured as a positive electrode by coating with the carbon film.SELECTED DRAWING: Figure 2 【課題】リチウムイオン二次電池の正極材料やその他の関連材料などとして有用なＬｉ５ＦｅＯ４を提供。【解決手段】Ｌｉ５ＦｅＯ４と、前記Ｌｉ５ＦｅＯ４の表面を被覆する炭素膜と、Ｆｅ３Ｃとを含有する炭素被覆Ｌｉ５ＦｅＯ４。放射光を用いたＸ線回折分析により、グラファイトに由来する回折ピークが観測され、更にＬｉ５ＦｅＯ４に由来する回折ピーク強度（ＩＬＦＯ）とＦｅ３Ｃに由来する回折ピーク強度（ＩＦｅ３Ｃ）との関係が下記式を満足する、炭素被覆Ｌｉ５ＦｅＯ４。０＜ＩＦｅ３Ｃ／ＩＬＦＯ＜０．１。【効果】前記炭素膜の被覆により優れた導電性が導かれるとともに、リチウムイオン二次電池の正極材料として十分な容量を確保することが可能となる。【選択図】図２