Fabrication and Performance of High Energy Li-Ion Battery Based on the Spherical Li[Li0.2Ni0.16Co0.1Mn0.54]O2 Cathode and Si Anode

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• 作者：Jing Ye ; Yi-xuan Li ; Li Zhang ; Xue-ping Zhang ; Min Han ; Ping He ; Hao-shen Zhou
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：January 13, 2016
• 年：2016
• 卷：8
• 期：1
• 页码：208-214
• 全文大小：462K
• ISSN：1944-8252

文摘

The cathode materials of Li-ion batteries for electric vehicles require not only a large gravimetric capacity but also a high volumetric capacity. A new Li-rich layered oxide cathode with superior capacity, Li[Li_0.20Ni_0.16Co_0.10Mn_0.54]O₂ (denoted as LNCM), is synthesized from precursor, a coprecipitated spherical metal hydroxide. The preparation technology of precursor such as stirring speed, concentration of metal solution, and reaction time are regulated elaborately. The final product LNCM shows a well-ordered, hexagonal-layer structure, as confirmed by Rietveld refinement of X-ray diffraction pattern. The particle size of the final product has an average diameter of about 10 μm, and the corresponding tap density is about 2.25 g cm^–3. Electrochemical measurements indicate that as-prepared LNCM has great initial columbic efficiency, reversible capacity, and cycling stability, with specific discharge capacities of 278 and 201 mAh g^–1 at 0.03 and 0.5 C rates, respectively. Cycling at 0.1 C, LNCM delivers a discharge capacity of 226 mAh g^–1 with 95% retention capacity after 50 cycles. Si/LNCM cell is fabricated using Si submicroparticle as anode against LNCM. The cell can exhibit a specific energy of 590 Wh kg^–1 based on the total weight of cathode and anode materials.