-       Materials design for rechargeable batteries and supercapacitors 

-      Materials characterization for understanding energy storage mechanism

-       Design of next generation energy storage materials and systems

Recent progress and perspective in electrode materials for K-ion batteries. Haegyeom Kim,^† Jae Chul Kim, ^† Matteo Bianchini, ^† Dong-Hwa Seo,Jorge Rodriguez-Garcia, and Gerbrand Ceder* Advanced Energy Materials. Vol. 8,1702384. (2018) ^†Equal contribution

The most accessed article from Advanced EnergyMaterials [December 2017]

Investigation of potassium storage inlayered P3-type K_0.5MnO₂ cathode. Haegyeom Kim, Dong-Hwa Seo, Jae Chul Kim, Shou-Hang Bo, Lei Liu, Tan Shi, Gerbrand Ceder^*Advanced Materials. Vol. 29,1702480. (2017)

K-ion batteries based on a P2-type K_0.6CoO₂cathode. Haegyeom Kim, Jae Chul Kim,Shou-Hang Bo, Tan Shi, Deok Hwang Kwon, and Gerbrand Ceder^*.Advanced Energy Materials, Vol. 7, 1700098(2017)

Exploiting lithium-etherco-intercalation in graphite for high-power lithium-ion batteries. Haegyeom Kim, ^†Kyungmi Lim, ^† Gabin Yoon, Jae-Hyuk Park, Kyojin Ku, Hee-Dae Lim,Yung-Eun Sung, and Kisuk Kang^*.Advanced Energy Materials, Vol. 7, 1700418(2017) ^†Equal contribution

A comparative study of graphiteelectrode using co-intercalation phenomenon for rechargeable Li, Na and Kbatteries. Haegyeom Kim, Gabin Yoon,Kyungmi Lim, and Kisuk Kang^* Chemical Communications, Vol. 52,12618-12621 (2016)

Intrinsic Nanodomains in Triplite LiFeSO₄Fand Its Implication in Lithium-Ion Diffusion Dong-Hwa Seo,^† Kyu-YoungPark,^† Haegyeom Kim,^†Sung-Kyun Jung, and Min-Sik Park, Kisuk Kang ^* Advanced Energy Materials. 1701408 (2017)^†Equal contribution

Recent progress in electrode materialsfor sodium-ion batteries. Hyungsub Kim, ^† Haegyeom Kim, ^† Zhang Ding, Myeong Hwan Lee, Kyungmi Lim, Gabin Yoon, andKisuk Kang^*Advanced Energy Materials, Vol. 6, 1600943(2016) ^†Equal contribution

The most accessed article from Advanced Energy Materials [June 2016-May 2017]

Understanding origin of voltagehysteresis in conversion reaction for Na rechargeable batteries: The case ofcobalt oxides. Haegyeom Kim, Hyunchul Kim,Hyungsub Kim, Jinsoo Kim, Gabin Yoon, Kyungmi Lim, Won-Sub Yoon, and Kisuk Kang^* Advanced Functional Materials, Vol. 26,5042-5050 (2016).