High-compacted-density positive electrode material and electrochemical energy storage apparatus
地域：
Ningde
摘要
This application relates to the field of battery technologies, and in particular, to a high-compacted-density positive electrode material and an electrochemical energy storage apparatus. The positive electrode material includes a lithium-nickel transition metal oxide A and a lithium-nickel transition metal oxide B. The lithium-nickel transition metal oxide A is secondary particles, whose chemical formula is shown in formula I: Lia1(Nib1Coc1Mnd1)x1M1-x1O2-e1Xe1. The lithium-nickel transition metal oxide B is a monocrystalline structure or a monocrystalline-like structure, whose chemical formula is shown in formula II: Lia2(Nib2Coc2Mnd2)x2M′1-x2O2-e2X′e2 (II). The positive electrode material of this application includes the large-particle lithium-nickel transition metal oxide A and the small-particle lithium-nickel transition metal oxide B to improve an energy density of the battery. A degree of crystallinity and particle size distribution of the mixed positive electrode material can improve a compacted density of the high-nickel active material, and ensure lower gassing and good cycle performance.
說(shuō)明書(shū)
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In the preparation method of the positive electrode material provided in this application, the lithium-nickel transition metal oxide A and/or the lithium-nickel transition metal oxide B may be surface-modified, for example, the lithium-nickel transition metal oxide A and/or lithium-nickel transition metal oxide B are separately surface-modified and then mixed, where the surface modification methods for the lithium-nickel transition metal oxide A and the lithium-nickel transition metal oxide B may be the same or different. Alternatively, the lithium-nickel transition metal oxide A and the lithium-nickel transition metal oxide B may be mixed first, and then the surface modification process is performed.
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