High-voltage lithium nickel manganese oxide/graphite lithium ion battery and manufacturing method thereof

The invention discloses a lithium nickel manganese oxide (LNMO)/graphite lithium ion battery and a manufacturing method thereof. The surface of a negative electrode is modified through an organic acid ester and components of an SEI (Solid-Electrolyte Interface) film are changed; the stability of an electrolyte and electrode interface is enhanced, so that the sharp attenuation of a capacity is effectively stopped. By optimizing electrolyte and adding a functional additive into traditional organic electrolyte, the first-time efficiency of the battery is improved, the self discharge of the battery is inhibited, the specific capacity of the battery is improved, and the battery with a high specific capacity and a long cycle is realized. In order to further stabilize efficient running of the LNMO/graphite lithium ion battery with the high specific capacity and the long cycle and improve the stability of the battery, the invention further provides modification in the aspect of a positive electrode. An LNMO@LTO posit