NONAQUEOUS ELECTROLYTE BATTERY, BATTERY PACK AND VEHICLE

• Main Authors: TAKAMI NORIO, HOSHINA KEIGO, YAMASHITA YASUNOBU, ISOZAKI YOSHIYUKI
• Format: Patent
• Language: English; Japanese
• Published: 21.09.2017
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; COMPOUNDS THEREOF; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

PROBLEM TO BE SOLVED: To provide: a nonaqueous electrolyte battery in which a side reaction on the surface of a positive electrode including a lithium manganese phosphate owing to the formation of a protection coating is suppressed; a battery pack including the nonaqueous electrolyte battery; and a vehicle.SOLUTION: A nonaqueous electrolyte battery according to an embodiment comprises: a positive electrode; a negative electrode; and a nonaqueous electrolyte. The positive electrode includes a positive electrode active material consisting of a compound represented by the following composition formula: LiMnFeAPO(where A is at least one element selected a group consisting of Mg, Ca, Al, Ti, Zn and Zr, 0≤x≤0.3, 0≤y≤0.1). According to X-ray photoelectron spectroscopic analysis on the surface of the positive electrode, the ratio (I/I) of a peak intensity (I) of a P-F bond to a peak intensity (I) of a P-O bond is 0.4 to 0.8 in the positive electrode. The negative electrode includes a negative electrode active material consisting of a titanium composite oxide.SELECTED DRAWING: None 【課題】リン酸マンガンリチウムを含む正極の表面において、保護被膜形成による副反応を抑制する非水電解質電池、それを備えた電池パックおよび車両を提供する。【解決手段】実施形態の非水電解質電池は、正極と、負極と、非水電解質と、を持つ。前記正極は、ＬｉＭｎ１−ｘ−ｙＦｅｘＡｙＰＯ４（但し、ＡはＭｇ、Ｃａ、Ａｌ、Ｔｉ、ＺｎおよびＺｒからなる群から選択される少なくとも１種、０≦ｘ≦０．３、０≦ｙ≦０．１）の組成式で表される化合物からなる正極活物質を含む。前記正極は、正極表面におけるＸ線光電子分光分析によるＰ−Ｏ結合のピーク強度（ＩＰ−Ｏ）とＰ−Ｆ結合のピーク強度（ＩＰ−Ｆ）の比（ＩＰ−Ｆ／ＩＰ−Ｏ）が０．４以上０．８以下。前記負極は、チタン複合酸化物からなる負極活物質を含む。【選択図】なし