Lithium battery containing transition metal and oxide thereof and preparation method thereof

Abstract

The invention discloses a preparation method of a lithium battery positive pole material, a preparation method of a positive pole, a battery positive pole prepared by the preparation method and a battery using the battery positive pole. The preparation method of the battery comprises the following steps: manufacturing a lithium battery positive pole piece material; carrying out die cutting on the positive pole piece material into a pole piece in the corresponding shape by using a mold, thereby forming a battery positive pole; sufficiently soaking the battery positive pole in an electrolyte; cleaning a battery jar with an organic solvent to remove surface impurities; and in a glove box filled with an argon protective atmosphere, putting the soaked positive pole into an underpan, injecting the electrolyte, putting a diaphragm in, injecting the electrolyte, putting a negative pole in, and finally, covering the battery jar and sealing. The scheme is beneficial to solving the problem of expansion of the battery positive pole in the discharge process, and further enhances the battery capacity by utilizing the battery internal space.

Description

technical field [0001] The invention relates to a technology in the field of electrochemistry, in particular to a method for preparing a lithium battery and a lithium battery prepared by using the method. Background technique [0002] In recent years, with the rapid development of digital products and electronic products in the direction of diversification and miniaturization, batteries are required to have large specific energy, high specific power, long life, reasonable price, and convenient use, so the demand for high-power and large-capacity batteries is rapid Increase. At present, primary batteries are widely used in many applications, such as ordinary zinc-manganese and alkaline zinc-manganese batteries. With the development of electronic technology and information technology, ordinary zinc-manganese batteries and alkaline manganese batteries can no longer meet the requirements of high-end electronic equipment. Especially the two requirements of high energy density an...

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Problems solved by technology

[0009] However, in the lithium-iron disulfide battery of the prior art, during the discharge process of the battery, the positive iron disulfide has a volume expansion effect, which seriously affects the safety performance and discharge stability of the battery.

At present, there are two main solutions: one is to place compressible or elastic metals, such as foamed metal and metal springs, on the outside of the positive electrode. Although this method can buffer the expansion of the material, it sacrifices the battery's internal The effective space seriously affects the performance of the battery capacity; the second is to build a metal skeleton structure for the positive electrode, using foamed nickel, aluminum foam, copper foam, etc. as the current collector. On the one hand, the foamed metal has a large thickness and low porosity, which also sacrifices a lot of space inside the battery

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