Lithium ion secondary battery

• Main Authors: SASAKI HIRONORI, SUZUKI SHUICHI
• Format: Patent
• Language: Chinese; English
• Published: 10.05.2017
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The objective of the present invention is to obtain a lithium ion secondary battery which is capable of improving the output power when charged/discharged at low temperatures or at room temperature. A lithium ion secondary battery which achieves the above-mentioned objective comprises a positive electrode plate (11) having a positive electrode mixture layer and a negative electrode plate (12) having a negative electrode mixture layer (45). The negative electrode mixture layer (45) contains a graphite-based material (42), a metal oxide (44) and a conductive assistant (43). The conductive assistant (43) is composed of a carbon material that is not doped/undoped with lithium ions, and is 0.4% by weight or more but less than 1.2% by weight relative to the weight of the negative electrode mixture layer (45). 本发明的课题在于获得种能够提高低温以及室温下的充放电时的输出的锂离子二次电池。解决上述课题的本发明的锂离子二次电池包括具有正极合剂层的正极板(11)和具有负极合剂层(45)的负极板(12)，负极合剂层(45)含有石墨系材料(42)、金属氧化物(44)和导电助剂(43)，该导电助剂(43)包括不进行锂离子的掺杂/去掺杂的碳材料，并且，导电助剂(43)相对于负极合剂层(45)的重量在0.4重量％以上且低于1.2重量％。