[One][Citation with related applications] [2]This application claims the benefit of priority based on Korean Patent Application No. 10-2019-0036126 filed on March 28, 2019, and all contents disclosed in the Korean Patent Application Document are incorporated as a part of this specification. [3] [4] [Technical field] [5] The present invention relates to a lithium secondary battery capable of suppressing an increase in electrode resistance and gas generation during high voltage driving. [6] background [7] Recently, interest in energy storage technology is increasing, and as the field of application is expanded to the energy of mobile phones, camcorders, notebook PCs, and even electric vehicles, efforts to research and develop electrochemical devices are becoming more concrete. [8] Among electrochemical devices, interest in the development of rechargeable batteries capable of charging and discharging is on the rise. In particular, lithium secondary batteries developed in the early 1990s are in the spotlight because of their high operating voltage and extremely high energy density. [9] Lithium secondary batteries generally form an electrode assembly by interposing a separator between a positive electrode including a positive electrode active material made of lithium-containing transition metal oxide and the like and a negative electrode including a carbon material negative electrode active material capable of occluding and releasing lithium ions. , manufactured by inserting the electrode assembly into a battery case, injecting a non-aqueous electrolyte, and then sealing the electrode assembly. [10] On the other hand, recently, the demand for high-capacity batteries is increasing, and accordingly, research and development of lithium secondary batteries driven at high voltages (eg, 4.3V or more) that can increase battery capacity are actively conducted. have. [11] Various lithium transition metal oxides such as LiCoO 2 and LiNi 1-ab Co a Mn b O 2 (0