NEGATIVE ELECTRODE AND NONAQUEOUS ELECTROLYTE BATTERY

• Main Authors: SHIKODA MASAKI, YAMAMOTO MASARU, NAMBA KAZUHIRO, SARUWATARI HIDESATO, KANO TETSUO, KURIYAMA HIROMICHI
• Format: Patent
• Language: English; Japanese
• Published: 27.07.2015
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

PROBLEM TO BE SOLVED: To provide a negative electrode which enables the materialization of a nonaqueous electrolyte battery superior in life property and rate characteristic.SOLUTION: A negative electrode 5 is provided according to an embodiment. The negative electrode 5 comprises: a negative electrode material layer 5b. The negative electrode material layer 5b includes: negative electrode active material particles 53; and a second conductive assistant 52. The active material particles 53 includes: monoclinic type niobium titanium complex oxide particles 50; and a first conductive assistant 51 on the surfaces of the complex oxide particles 50. The second conductive assistant 52 is located between the active material particles 53. In Raman spectra obtained from Raman spectroscopy on the negative electrode material layer 5b, the first conductive assistant 51 and the second conductive assistant 52 have D band arising in a frequency range of 1300 cm-1400 cm, and G band arising in a frequency range of 1550 cm-1650 cm, respectively. As to the first conductive assistant, the intensity ratio I/Iis within a range of 0.5-1.3. With the second conductive assistant, the intensity ratio I/Iis within a range of 1.5-10. 【課題】寿命特性及びレート特性に優れる非水電解質電池を実現できる負極を提供すること。【解決手段】実施形態によると負極５が提供される。負極５は負極材料層５ｂを具備する。負極材料層５ｂは複数の負極活物質粒子５３と第２導電助剤５２とを含む。複数の活物質粒子５３は、単斜晶型ニオブチタン複合酸化物粒子５０と複合酸化物粒子５０の表面に接している第１導電助剤５１とを含む。第２導電助剤５２は活物質粒子５３間に配されている。第１導電助剤５１及び第２導電助剤５２は、負極材料層５ｂからラマン分光法により得られるラマンスペクトルにおいて、１３００ｃｍ-1〜１４００ｃｍ-1の振動数領域内に現れるＤバンドと現れる１５５０ｃｍ-1〜１６５０ｃｍ-1の振動数領域内に現れるＧバンドとそれぞれ有する。第１導電助剤は強度比ＩG／ＩDが０．５〜１．３の範囲内にある。第２導電助剤は強度比ＩG／ＩDが１．５〜１０の範囲内にある。【選択図】 図２