NEGATIVE ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS SECONDARY BATTERY AND NONAQUEOUS SECONDARY BATTERY

• Main Authors: NAKATSUTSUMI TAKAYUKI, TAKAHATA MASAHIRO, OKANO TETSUYUKI, MATSUSHITA JUNKO, MAENISHI MAYUMI, KANO SATOSHI, HOJO NOBUHIKO
• Format: Patent
• Language: English; Japanese
• Published: 06.12.2018
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide a nonaqueous secondary battery capable of satisfying both of chemical stability of negative electrode and high discharge capacity.SOLUTION: Negative electrode active material for nonaqueous secondary battery includes graphite containing boron and nitrogen. Defining total peak area of boron 1s spectrum obtained from graphite by X-ray photoelectron spectroscopy as S; defining peak area of spectrum attributable to boron bonded to nitrogen in the boron 1s spectrum as S; and defining S/Sas R1, R1 is 0.5-1. Defining the peak area of carbon 1s spectrum obtained from the graphite by X-ray photoelectron spectroscopy as S; defining the peak area of nitrogen 1s spectrum obtained from said graphite by X-ray photoelectron spectroscopy as S; and defining S/(S+S+S) as R2, R2 is more than 0 and 0.05 or less.SELECTED DRAWING: Figure 1 【課題】非水二次電池において、負極の化学的安定性と高い放電容量とを両立させる。【解決手段】非水二次電池用負極活物質は、ホウ素および窒素を含有する黒鉛を含む。Ｘ線光電子分光法によって前記黒鉛から得られたホウ素１ｓスペクトルの全ピーク面積をＳＢとし、前記ホウ素１ｓスペクトルのうち、窒素と結合したホウ素に起因するスペクトルのピーク面積をＳＢＮとし、ＳＢＮ／ＳＢをＲ１とした場合、Ｒ１は０．５以上１以下である。また、Ｘ線光電子分光法によって前記黒鉛から得られた炭素１ｓスペクトルのピーク面積をＳＣとし、Ｘ線光電子分光法によって前記黒鉛から得られた窒素１ｓスペクトルのピーク面積をＳNとし、ＳＢ／（ＳＢ＋ＳＣ＋ＳＮ）をＲ２とした場合、Ｒ２は０を超え０．０５以下である。【選択図】図１