Nickel cobalt lithium manganate battery core positive electrode active material, aluminum housing battery core and manufacturing method thereof

Abstract

The invention relates to a nickel cobalt lithium manganate battery positive electrode active material, an aluminum housing battery core and a manufacturing method thereof. The positive electrode active material is nickel cobalt lithium manganate, and the molar ratio of nickel cobalt manganese in the nickel cobalt lithium manganate is 1: 1: 1 or 5: 2: 3 or 6: 2: 2 or 8: 1; the aluminum housing battery core comprises a positive electrode, a negative electrode, a diaphragm, an electrolyte and an aluminum housing body; the positive electrode comprises a positive electrode active material, a binder, a conductive agent and a positive electrode current collector; the negative electrode comprises a negative electrode active material, a negative electrode binder, a negative electrode conductive agent and a negative electrode current collector; and the battery core adopts a multi-tab winding structure formed by connecting the diaphragm, the positive electrode, the diaphragm and the negative electrode; and the positive electrode active material is lithium manganate or lithium nickel cobalt manganate or a mixture of lithium manganate and lithium nickel cobalt manganate. The prepared battery core has the advantages of good low-temperature performance, good rate capability and good cycle performance.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, and more specifically relates to a positive electrode active material of a nickel-cobalt lithium manganese oxide battery, an aluminum shell battery and a manufacturing method thereof. Background technique [0002] Lithium-ion batteries are currently widely used due to their higher operating voltage than lead-acid batteries and better cycle life of nickel-metal hydride batteries. Lithium manganate material has become the mainstream lithium battery electrode material due to its low cost, high voltage platform, and good safety performance. However, due to its own structure, the current conventional lithium manganate has the Jahn.Teller effect and the dissolution of manganese during charging and discharging. The cycle performance is poor, which greatly reduces the use value of lithium manganese oxide. In addition, the conventional graphite negative electrode currently used has poor conductivity,...

AI Technical Summary

Problems solved by technology

Lithium manganate material has become the mainstream lithium battery electrode material due to its low cost, high voltage platform, and good safety performance. However, due to its own structure, the current conventional lithium manganate has the Jahn.Teller effect and the dissolution of manganese during charging and discharging. The cycle performance is poor, which greatly reduces the use value of lithium manganate

In addition, the conventional graphite negative electrode currently used has poor conductivity, low ion transfer efficiency, large temperature rise of the battery cell during charging and discharging, and easy lithium precipitation during the high-rate charging and discharging process.

And due to the structural characteristics of graphite itself, the negative electrode gram capacity of conventional graphite is low

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