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DOE OSTI · 1882661

Improving LiNiO 2 cathode performance through particle design and optimization

Kim, Minkyung·Zou, Lianfeng·Son, Seoung-Bum·Bloom, Ira D.·Wang, Chongmin·Chen, Guoying
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Abstract

We report to enable further development of Ni-rich LiNi x Mn y Co 1-x-y O 2 (NMC, x ≥ 0.9) cathodes for commercial applications, fundamental understanding of the synthesis–property–performance relationships in the LiNiO 2 (LNO) parent phase is essential. In the present study, we report synthesis approaches to produce well-formed, similar-sized single-crystal LiNiO 2 (SC-LNO) with different shapes and dominating surface facets, and reveal the dependence of cathode rate performance and cycling stability on particle morphology and surface. While octahedron-shaped SC-LNO with the (012) surface shows better rate capability and improved ability in utilizing the kinetically slow anodic process in the 3.5 V region, cubic-shaped SC-LNO with the (104) surface delivers superior cycling stability, especially upon cycling at a high upper cutoff voltage of 4.6 V. Improvement in cycling stability is correlated with reduced surface reconstruction and preferential LiF formation through the interaction with the electrolyte on the (104) surface. Our study not only demonstrates the importance of particle morphology and surface design, it also provides key insights into desirable material properties for developing future LNO-based cathode materials with better performance.

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25 ENERGY STORAGEcathodelithium-ion batteryparticle design

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Kim, Minkyung, Zou, Lianfeng, Son, Seoung-Bum, Bloom, Ira D., Wang, Chongmin, Chen, Guoying. 2022-05-17. Improving LiNiO 2 cathode performance through particle design and optimization. https://doi.org/10.1039/d2ta02492f

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