LiNixCoyMn1-x-yO2 Cathode Material Synthesized through Construction of E-pH Diagram and Its Electrochemical Performance

doi:10.15541/jim20170192

Abstract

Abstract:

The thermodynamic data of various species in Li-Ni-Co-Mn-H₂O system is obtained by thermodynamics calculation, and E-pH diagrams for Li-Ni-Co-Mn-H₂O system with activity 1.00 at 25℃ and 200℃ were constructed. From E-pH diagrams, it shows that there is no predominant region of the LiNi_xCo_yMn_1-_x_-_yO₂ composite oxide in pH range of 3~13 at 25℃. However, the stability region of various species expands towards the low pH and low potential zones as the temperature increases. When pH is between 9.7~13.0 at 200℃, synthesis of LiNi_xCo_yMn_1-_x_-_yO₂ via aqueous process is thermodynamically possible, and high temperature is favorable. Experimental results showed that the composite precursor (LNCM) with α-NaFeO₂ structure was successfully prepared in aqueous solution by using (Ni_0.5Co_0.2Mn_0.3)(OH)₂ as precursor and LiOH·H₂O as raw material. LiNi_0.5Co_0.2Mn_0.3O₂cathode materials were then obtained by post heat treatment and following tests exhibited excellent cycling performance. These experimental results are in consistent with the information given in E-pH diagram of the Li-Ni-Co-Mn-H₂O system, and the as-prepared LiNi_0.5Co_0.2Mn_0.3O₂cathode materials show excellent cycling performance.

Key words: E-pH diagram, Li-Ni-Co-Mn-H₂O system, lithium ion battery, cathode material

CLC Number:

TM912

LI Ling, LI Yun-Jiao, XU Bin, LU Wei-Sheng, SU Qian-Ye, CHEN Yong-Xiang, LI Lin. LiNi_xCo_yMn_1-_x_-_yO₂ Cathode Material Synthesized through Construction of E-pH Diagram and Its Electrochemical Performance[J]. Journal of Inorganic Materials, 2018, 33(3): 320-324.

Figures/Tables 5

Fig. 1 Potential-pH diagrams of Li-Ni-Co-Mn-H2O system at 25℃

Fig. 2 Potential-pH diagrams of Li-Ni-Co-Mn-H2O system at 200℃

Fig. 3 XRD patterns of the LNCM oxide precursor (a) and the final product LiNi0.5Co0.2Mn0.3O2 (b)

Fig. 4 Charge/discharge curves of the LiNi0.5Co0.2Mn0.3O2 cathode materials synthesized at 175℃ and 250℃

Fig. 5 Discharge cycling performance and capacity retention rate of the LiNi0.5Co0.2Mn0.3O2 cathode materials synthesized at 175℃ and 250℃

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LiNi_xCo_yMn_1-_x_-_yO₂ Cathode Material Synthesized through Construction of E-pH Diagram and Its Electrochemical Performance

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