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

Properties of LiNi0.8Co0.1Mn0.1O2 as a high energy cathode material for lithium-ion batteries

“…The discharge capacity gradually decreases from 170.4 mAh g −1 at the 1 st cycle (1 C-rate) to 153.7 mAh g −1 at the 100 th cycle with a capacity retention of 90.4% over 3.0 to 4.3 V. For cycling with 4.5 and 4.7 V of the upper cut-off voltage, only 43.8 and 47.8% of the initial capacity was retained at the 100 th cycle. This severe capacity fading at a high cut-off voltage may be a result of the interfacial reaction between the electrolyte and the cathode material and a dissolution of the cobalt at a high operating potential (>4.3 V), which can lead to a significant degradation in the capacity retention [42,43]. The rate capability is well-known to be strongly affected by the surface area and the primary particle size of the cathode material.…”

Multifunctional Li2O-2B2O3 coating for enhancing high voltage electrochemical performances and thermal stability of layered structured LiNi0.5Co0.2Mn0.3O2 cathode materials for lithium ion batteries

“…[9,10] Surface modification with various coating materials including metal oxides, fluorides, and phosphates have been shown to be an effective strategy to alleviate both the mechanical and chemical degradation, thus improving the electrochemical performance of electrode materials including cycling behavior and rate capability. [11][12][13][14][15][16][17][18][19][20][21][22][23] However, aforementioned coating has significant influence on the penetration of lithium ion or/and electron through the coated layer, which will result in an increased polarization or decreased capacity. To solve these defects, some conductive polymers and fast ionic conductor materials were widely used as surface coating layer on the cathode active materials.…”

Enhanced high voltage performances of layered lithium nickel cobalt manganese oxide cathode by using trimethylboroxine as electrolyte additive

“…Decomposition of electrolyte and metal dissolution can be suppressed by creating a protective layer/film on the cathode surface [9,10,11]. Using electrolyte additives to generate a protective film on the cathode surface during initial charge/ discharge is one of the most economic and effective methods to improve the electrode/electrolyte interface stability [12,13,14,15,16,17,18].…”