Progress made in high-nickel cathode materials used in high-energy-density lithium-ion battery
2017-04-07 17:44:16 [Print]
As a 2016 priority project standing on the Chinese government agenda for new energy vehicles, the project Technical Solutions on Development and Industrialization of High-energy-density Lithium-ion Battery has made breakthrough progresses in the research on high-nickel cathode materials.
The project team has solved technical problems including low discharge capacity and preliminary efficiency of high-nickel cathode materials, improving them to ≥206mAh/g and ≥90% respectively, without increasing its Ni contents; and also improved the tapping density to ≥2.1g/cm3, magnetic impurity content ≤40ppb, and pH≤11.7. The project now owns a 20t/m trial production line.
Meanwhile, the project team successfully realized a continuously graded distribution of the three elements (Ni, Co, Mn) from the core to the rim in the precursor, thus dramatically reducing the unevenness of the cathode material in size and stress, reducing the number of grain cracks in charge and discharge process, and improving capacity retention ratio. This technique also helps improve the evenness of precursors of different batches, ensuring that they are of binary-sphere shape, controllable grain diameter and graded distribution, and tapping density ＞1.8g/cm3.
The above progresses laid sound foundation to accuracy in grouping and grading of high-nickel ternary cathode materials, and thus to the development of high-energy-density and long-usage-life cathode materials.
The project team has solved technical problems including low discharge capacity and preliminary efficiency of high-nickel cathode materials, improving them to ≥206mAh/g and ≥90% respectively, without increasing its Ni contents; and also improved the tapping density to ≥2.1g/cm3, magnetic impurity content ≤40ppb, and pH≤11.7. The project now owns a 20t/m trial production line.
Meanwhile, the project team successfully realized a continuously graded distribution of the three elements (Ni, Co, Mn) from the core to the rim in the precursor, thus dramatically reducing the unevenness of the cathode material in size and stress, reducing the number of grain cracks in charge and discharge process, and improving capacity retention ratio. This technique also helps improve the evenness of precursors of different batches, ensuring that they are of binary-sphere shape, controllable grain diameter and graded distribution, and tapping density ＞1.8g/cm3.
The above progresses laid sound foundation to accuracy in grouping and grading of high-nickel ternary cathode materials, and thus to the development of high-energy-density and long-usage-life cathode materials.
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