Lithium cell cathode material with manganese-based laminated crystal structure and preparation method thereof

Abstract

The invention relates to a manufacture technology of lithium cells, in particular to a preparation method of a lithium cell cathode material with a manganese-based laminated crystal structure, which comprises the steps of: 1, preparing a precursor of LI[Li0.20Ni0.133Co0.133Mn0.534]O2 by adopting a mechanical activating method; 2, pelleting by adopting a closed cycle spraying drying method; and 3,preparing a laminated crystal structure Li[Li0.20Ni0.133Co0.133Mn0.534]O2 by adopting a high-temperature solid phase method. In the material and the method, most of cobalt in lithium cobaltite is replaced with cheap metal manganese, cost of raw materials is lower, the preparation process is simple, and micron-level powder particles can show excellent cell properties. Through detection, capacity of the cathode material reaches 236mAh / g and is about 60 percent higher than that of lithium cobaltite and lithium iron phosphate, and the cathode material has excellent safety property.

Description

technical field [0001] The invention relates to lithium battery manufacturing technology, in particular to a manganese-based layered crystal structure lithium battery cathode material and a preparation method thereof. Background technique [0002] There are three main anode materials commonly used in the market for lithium batteries: lithium cobalt oxide (LiCoO 2 ), lithium manganate (LiMn 2 o 4 ) and lithium iron phosphate (LiFePO 4 ). [0003] Lithium cobalt oxide (LiCoO 2 ) has a layered crystal structure, the storage capacity is about 140mAh / g, and the cycle performance is relatively superior. However, due to the high price of the raw material cobalt, its application is limited to small-capacity batteries, such as rechargeable batteries for small electronic products. [0004] Lithium manganate (LiMn 2 o 4 ), has a spinel crystal structure, and the cost of raw materials is relatively low, but its capacity is only 100mAh / g, which is about 30% lower than lithium coba...

AI Technical Summary

Problems solved by technology

The cost of raw materials is relatively low, but because of the extremely complicated preparation process, the price of the final finished electrode material is still relatively high

Because of its very poor conductivity, lithium iron phosphate needs to be made into nano-scale powder particles to show better battery cycle performance, which causes great difficulties in the preparation process. Some domestic manufacturers are trying to produce, but Due to the unstable batch quality, it has not been able to be put into large-scale production

At present, only a few manufacturers in the world can mass-produce high-performance lithium iron phosphate, and the price is very expensive (>180,000 yuan / ton)

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