Hydrothermal-Assisted Synthesis of Li-Rich Layered Oxide Microspheres with High Capacity and Superior Rate-capability as a Cathode for Lithium-ion Batteries

Enhanced electrochemical performance of Li-rich low-Co Li1.2Mn0.56Ni0.16Co0.08−x Al x O2 (0≤x≤0.08) as cathode materials

“…Taking into account the cost, low Co-based Li-rich material with high content of Mn should be developed. However, the Co-free Li-rich material usually suffers from poorer rate capability [24] because the presence of cobalt in materials can greatly enhance the oxygen loss, reduce the replacement of lithium and nickel, and effectively promote Li2MnO3 activation [25][26][27]. Developing doped high-performance Li-rich material using earth-abundant elements is more desirable and noble metals (such as Ru, Ag, etc.…”

Comparative Investigation of 0.5Li2MnO3·0.5LiNi0.5Co0.2Mn0.3O2 Cathode Materials Synthesized by Using Different Lithium Sources

“…It is demonstrated that the high capacity of the materials originates from the oxygen escape from Li 2 MnO 3 phase at high voltage (Yabuuchi et al, 2011). In addition, there are so many fatal disadvantages in lithium-rich manganese-based cathode materials, such as severe voltage fading during cycling (Zheng J. et al, 2015; Zhang T. et al, 2016) poor rate performance (Fan et al, 2015; Rozier and Tarascon, 2015; Zhang K. et al, 2015), large initial irreversible capacity, and low initial coulombic efficiency (Bai et al, 2015). Presently, many methods like comprising doping (Dianat et al, 2013; Wang et al, 2013; Li et al, 2014; Zhang H. et al, 2014), coating (Shi et al, 2012, 2013; Gu et al, 2013; Zhang et al, 2013; Zhou et al, 2017; Liu et al, 2018), nano crystallization (Wang et al, 2010), and morphology control (Yang et al, 2013; Remith and Kalaiselvi, 2014) have been proposed to promote the electrochemical performance of the materials.…”

“…According to the chemical formula of lithium-rich manganese-based cathode materials, it can be simply written as x Li 2 MnO 3 ·( 1-x )LiMO 2 (M = Ni, Co, Mn, Ti, Fe, etc. ; Ohzuku et al, 2011; Yabuuchi et al, 2011; Bai et al, 2015; Fan et al, 2015; Rozier and Tarascon, 2015; Zheng J. et al, 2015; Zhang T. et al, 2016). Common and representative components of lithium-rich manganese-based materials are 0.5Li 2 MnO 3 ·0.5LiNi 0.5 Mn 0.5 O 2 and 0.5Li 2 MnO 3 ·0.5LiNi 1/3 Co 1/3 Mn 1/3 O 2 (Shi et al, 2012, 2013; Dianat et al, 2013; Gu et al, 2013; Wang et al, 2013; Yang et al, 2013; Zhang et al, 2013; Zhang H. et al, 2014; Li et al, 2014; Zhou et al, 2017).…”

Understanding the Role of Solution Equilibrium and Precipitation Rate on Precursor Composition for Lithium-ion Battery Active Materials

“…While this study suggests that predictive calculations should be done to adjust the feed stoichiometry to target the desired precipitate stoichiometry, this is rarely reported. Of the 150 co-precipitation papers cited from the recent literature above, only 6 performed equilibrium calculations as part of their analysis 68,[81][82][83][84][85] , none used this analysis to guide their feed conditions, only some confirmed the stoichiometry of the transition metals in the precipitate 68,71,73,74,[86][87][88][89][89][90][91][92][93][94][95] , and none considered whether the relative rate of co-precipitation was different for the different transition metals. In this paper, we will use equilibrium calculations to guide the selection of feed conditions to achieve precursors with explicit composition control and will demonstrate the importance of such control for some solution conditions and impact on the electrochemical behavior of an exemplar cathode material.…”

“…Carbonate co-precipitation is another popular method to synthesize 3:1 Mn:Ni; however NiCO3 is difficult to form as a stable precipitate 84,85,[96][97][98][99][100] . Hydroxide co-precipitation is also more complex because of the tendency of Mn to oxidize to MnOOH 76,81,86,92,95,101,102 .…”