A Stable CaV₄O₉ Anode Promises Near‐Zero Volume Change and High‐Capacity Lithium Storage

Abstract

Even though lithium ion batteries (LIBs) have seen extensive applications during the past 20 years, the anode materials which have realized commercialization are mainly restricted to graphite and Li4Ti5O12. However, because of the limited capacity of these two intercalation‐type anodes, they cannot meet the higher requirements in energy density of some applications. Very few types of high‐capacity anode materials have been successfully commercialized, mainly due to the inevitable large volume change during lithium insertion/extraction. Herein, a promising anode material, CaV4O9, which shows both high gravimetric capacity of more than 600 mAh g–1 with a safe average discharge potential of about 0.8 V, and near‐zero volume change character like Li4Ti5O12, is identified. The specific lithium storage mechanism and the origin of near‐zero volume change character are revealed. Considering the superior performance endowed by these unique intrinsic properties, CaV4O9 shows great potential for commercialized anode material and may promote innovation in LIBs.

A general strategy to enhance the electrochemical activity and energy density of energy-storage materials through using sintering aids with redox activity: a case study of Mo4Nb26O77

“…7d–f (also see the ESI Video†), verifying the high electrochemical activity of the Mo 4 Nb 26 O 77 submicron-sized particles. 47,48 However, the morphology and volume variations are rather small, which confirms the intercalation nature of Mo 4 Nb 26 O 77 with small unit-cell-volume change.…”

Lithium‐Ion Thermal Charging Cell with Giant Thermopower for Low‐Grade Heat Harvesting

“…Encouragingly, such values are much higher than that of CNF (19.5 %) and ZnVO (15.4 %) as well as some previously reported anode of LIBs and LICs (Figure S18b). [35][36][37][38][39][40][41][42][43][44][45] When the current density returns to 0.1 A g À 1 , a high capacity of 570 mAh g À 1 equivalent to the initial value still can be recovered, highlighting the excellent reversibility and structural stability. Cycling stability is an important parameter to keep in pace with the requirements for the development of durable energy storage materials.…”

Zero‐Strain High‐Capacity Silicon/Carbon Anode Enabled by a MOF‐Derived Space‐Confined Single‐Atom Catalytic Strategy for Lithium‐Ion Batteries

“…[1][2][3] However, subject to intrinsic lithium storage mechanism, LIBs suffer from large volume change of electrode materials during lithiation and delithiation processes, which unavoidably cause pulverization of electrode and overall performance deterioration of batteries. Under such background, a category of electrode materials so called "zero-strain" or "low-strain" materials undergone small volume change during cycling has been developed, such as anode materials of CaV 4 O 9 , [4] Li 4 Ti 5 O 12 , [5,6] TiNb 2 O 7 , [7] LiCrTiO 4 , [8] LiY(MoO 4 ) 2 , [9] and Li 3.08 Cr 0.02 Si 0.09 V 0.9 O 4 , [10] and cathode materials of LiCoO 2 [11] and Li 1.2 Ni 0.4 Ru 0.4 O 2 . [12] To date, zero-strain electrode materials reported are merely limited to single crystals.…”