NEGATIVE ELECTRODE ACTIVE MATERIAL, MANUFACTURING METHOD OF THEM, AND LITHIUM SECONDARY BATTERY CONTAINING THEM

• Main Authors: LEE JEONGHOON, SHIM HYEONWOO, CHOI WOOYEONG, KWON SEMAN, LEE JONGHA
• Format: Patent
• Language: English; Japanese
• Published: 07.06.2024
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide a negative electrode active material for a secondary battery with a long life characteristic that a stably charging/discharging behavior can be made even after it is used for a long time while having a high capacitance and a high energy density.SOLUTION: The present invention relates to a negative electrode active material for a lithium secondary battery, containing a core containing a metal particle and a shell layer formed in an outside part of the core. The shell layer contains a metal carbide particle and a carbon system material. A number density in the shell layer of the metal carbide particle (number/μm2) is 50 or more and 100 or less. The present invention relates to a manufacturing method and a lithium secondary battery containing them.SELECTED DRAWING: Figure 1 【課題】高容量及び高エネルギー密度を有しながらも、長い期間使用した後にも安定的な充電／放電挙動が可能な長い寿命特性の二次電池のための負極活物質を提供する。【解決手段】本発明は、金属粒子を含むコア及び前記コアの外部に形成されたシェル層を含み、前記シェル層は金属炭化物粒子及び炭素系物質を含み、前記金属炭化物粒子の前記シェル層内の数密度（ｎｕｍｂｅｒ ｄｅｎｓｉｔｙ）（個数／μｍ２）が５０以上１００以下であることを特徴とするリチウム二次電池用負極活物質及びその製造方法と、これを含むリチウム二次電池に関する。【選択図】図１