Effect of ZnO modification on the performance of LiNi0.5Co0.25Mn0.25O2 cathode material

Guo, Rui; Shi, Peipei; Cheng, Xinqun; Sun, Leqiang

doi:10.1016/j.electacta.2009.05.034

Cited by 65 publications

(35 citation statements)

References 37 publications

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“…Our findings also suggest reexamination of MgO and ZnO coatings on layered cathodes to confirm coating reactivity during battery operation. 74,75 The unanticipated phases that form due to coating reactivity during heat-treatment and battery operation may be harmful or helpful for TM containment and other cathode performance criteria. In any case, consideration of our findings can help target coating compositions for improved performance.…”

Section: Resultsmentioning

confidence: 99%

“…Coatings can also be deposited on cathode particles prior to composite mixing, which facilitates greater coverage of the cathode particle surface. 18,19,[72][73][74][75][81][82][83] Higher surface coverage is beneficial for TM containment, but may impede electronic conductivity. In this work, we do not explicitly consider deposition methods.…”

Section: Discussion: Coating Depositionmentioning

confidence: 99%

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Lithium-Ion Cathode/Coating Pairs for Transition Metal Containment

Snydacker

Aykol

Kirklin

et al. 2016

J. Electrochem. Soc.

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For many lithium-ion cathode materials, transition metal (TM) dissolution into the electrolyte contributes to cell degradation. Cathode coatings can limit TM dissolution by containing TMs in cathode materials. We perform density functional theory calculations to evaluate cathode/coating pairs for TM containment, specifically focusing on reactive stability of coating/cathode pairs as well as TM solubility in the coating materials. We consider stability and containment of materials at both synthesis and operating conditions. We find that many cathode/coating pairs are reactive when lithiated, while other cathode-coating pairs are stable when lithiated but become reactive following delithiation. Of all the coatings that we considered, Li 3 PO 4 occupies a unique chemical position, in that its coatings on oxide cathode materials maintained equilibrium under both lithiated and delithiated conditions. Furthermore, for oxide cathode materials, the Li 3 PO 4 coatings exhibit low TM solubilities across all cathode states of charge. Our results demonstrate that Li 3 PO 4 is a promising candidate for stable coatings on oxide cathode materials to limit TM dissolution into the electrolyte. Li-ion batteries are the dominant power sources in consumer electronics, and they are emerging as cost-competitive players in lowcarbon electricity systems and vehicles. However, many technologies are encumbered by the limited durability of today's Li-ion cells. For these applications, battery manufacturers have an incentive to improve cell durability. Transition metal (TM) dissolution from the cathode is a major contributor to cell degradation during cycling and aging.1 TM dissolution from the cathode contributes directly to capacity loss by decreasing the amount of cathode material. Furthermore, TMs that dissolve from the cathode material can migrate through the electrolyte to the anode, where they can cause changes to the anode Solid Electrolyte Interphase (SEI).2,3 These changes to the SEI increase impedance, decrease cell capacity, and decrease lifespan.A variety of strategies have been used to limit degradation by TMs. Electrolyte additives have been used to control SEI formation and limit the impact of TMs in the electrolyte. 4,5 Molecules have been attached to the polymer separator to sequester TMs from the electrolyte before they reach the anode. 6 In this work, we consider upstream strategies that limit TM dissolution from the cathode into the electrolyte. These upstream strategies are complementary to other strategies, including SEI formation and TM sequestration. There are several distinct categories of strategies for limiting TM dissolution from the cathode. Electrolytes can be tailored to reduce reactivity with the cathode. 7-9Cathode materials can be doped to control the oxidation states of transition metals. 10,11 This doping can be applied to the entire cathode particle or just near the surface.12 Cathode materials can also be covered with surface coatings to limit TM dissolution. [13][14][15][16][17][18][19] Surface coati...

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Section: Resultsmentioning

confidence: 99%

Section: Discussion: Coating Depositionmentioning

confidence: 99%

Lithium-Ion Cathode/Coating Pairs for Transition Metal Containment

Snydacker

Aykol

Kirklin

et al. 2016

J. Electrochem. Soc.

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“…For example, Guo et al [15] reported that ZnO coating could improve the cycling performance and rate capability of Li[Ni 0.5 Co 0.25 Mn 0.25 ]O 2 at 5 C between 2.8 and 4.4 V. Liu et al [13] found that CuO coating layer could protect the bulk Li[Ni 0.5 Co 0.2 Mn 0.3 ]O 2 against corrosion from electrolyte, resulting in the improvement of the discharge capacity and better capacity retention.…”

Section: Introductionmentioning

confidence: 98%

“…Surface modification is regarded as a very effective method to improve the electrochemical performance of Li [10], MgO [11], ZrO 2 [12], CuO [13], MoO 3 [14] and ZnO [15] have been used to improve its electrochemical performance. For example, Guo et al [15] reported that ZnO coating could improve the cycling performance and rate capability of Li[Ni 0.5 Co 0.25 Mn 0.25 ]O 2 at 5 C between 2.8 and 4.4 V. Liu et al [13] found that CuO coating layer could protect the bulk Li[Ni 0.5 Co 0.2 Mn 0.3 ]O 2 against corrosion from electrolyte, resulting in the improvement of the discharge capacity and better capacity retention.…”

Section: Introductionmentioning

confidence: 99%

Enhanced cycling stability and rate performance of Li[Ni 0.5 Co 0.2 Mn 0.3 ]O 2 by CeO 2 coating at high cut-off voltage

Liu

Yang

Dong

et al. 2015

Journal of Power Sources

109

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“…In the equivalent circuit, R s is the ohmic resistance of the electrolyte, R f and CPE1 are surface layer resistance, and film capacitance, respectively. R ct is the charge transfer resistance and CPE2 is associated with its interfacial capacitance and indicates the double layer capacitance and W is the Warburg impedance [29]. The obtained R f values were clearly shown in Fig.…”

Section: Resultsmentioning

confidence: 95%