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High-compacted-density positive electrode material and electrochemical energy storage apparatus

專(zhuān)利號(hào)
US11177468B2
公開(kāi)日期
2021-11-16
申請(qǐng)人
CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED（CN Ningde）
發(fā)明人
Rui Du; Yongchao Liu; Deyu Zhao; Na Liu
IPC分類(lèi)
H01M4/131; H01M4/134; H01M4/505; H01M4/525; H01M10/0525; C01G53/00; H01M4/02
技術(shù)領(lǐng)域
lithium,nickel,transition,oxide,electrode,positive,metal,μm,particle,δpsd
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)

Example 7

Tables 1 and 2 list specific parameters and performance test results of the positive electrode material in Examples 1 to 15 and Comparative Examples 1 to 7. It can be seen from comparison between Examples and Comparative Examples that, in the Examples of this application, the lithium-nickel transition metal oxide A with large lithium particles was mixed with the lithium-nickel transition metal oxide B with small lithium particles, and the degree of crystallinity and particle size distribution of the mixed high-nickel active material were controlled to mitigate the particle crushing problem during cold pressing and cycling, improve the compacted density of the high-nickel powder, and ensure lower gassing and good cycle performance.

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