Preparation of FePO4 by liquid-phase method and modification on the surface of LiNi0.80Co0.15Al0.05O2 cathode material

Rearrangement on surface structures by boride to enhanced cycle stability for LiNi0.80Co0.15Al0.05O2 cathode in lithium ion batteries

“…With this in mind, preventing the direct contact between the NCA material with the electrolyte by surface coating is an effect strategy [20][21][22] . Generally, an ideal surface coating layer should possess properties as follows: good structural stability, excellent chemical stability against both NCA and electrolyte, high ionic conductivity for fast Li + transport, and the same or close to the bulk phase element, such as Al 2 O 3 [23] , Li 4 Ti 5 O 12 [24] , SiO 2 [25] , AlF 3 [26] , Li 3 PO 4 [27] , Ni 3 (PO 4 ) 2 [28] , FePO 4 [29] . Recent, Sun et al have shown that it is effective to use a solid electrolyte to rearrange the grain boundary of a high nickel positive electrode can provide a fast path for the Li + transport and simultaneously prevents penetration of the liquid electrolyte into the boundary [30] .…”

NCA, NCM811, and the Route to Ni-Richer Lithium-Ion Batteries

“…This electrode delivered a capacity of 153.7 mAh g −1 at 5 C, and 107.5 mAh g −1 after 300 cycles at 5 C, corresponding to a retention of 90%. NCA was also coated with FePO 4 by Huang et al [107], and more recently by Xia et al who used a liquid phase process [108]. At 1 C rate, the capacity was 160 mAh g −1 , with a capacity retention of 85.82% for the optimized amount 2 wt.% FePO 4 .…”

Advances and Prospects of Surface Modification on Nickel‐Rich Materials for Lithium‐Ion Batteries†

“…As mentioned before, the coating materials used in Ni‐rich materials include inorganics, organics, and some composite coating materials. For inorganics, the coating materials in recent works mainly include metal oxides (ZnO, [ 33 ] TiO 2 , [ 33‐37 ] Al 2 O 3 , [ 30,33,38‐42 ] ZrO 2 , [ 38,43‐46 ] Nb 2 O 3 , [ 47 ] Co 3 O 4 , [ 33,48 ] Cr 8 O 21 , [ 49 ] MgO, [ 38 ] MnO 2 , [ 50,51 ] V 2 O 3 , [ 33 ] and V 2 O 5 [ 52 ] ), metal fluorides (LiF, [ 53‐55 ] AlF 3 , [ 54,56 ] and FeF 3 [ 57 ] ), metal phosphates (LaPO 4 , [ 58‐60 ] FePO 4 , [ 61‐63 ] CoPO 4 , [ 62,63 ] AlPO 4 , [ 40,62,64‐65 ] and MnPO 4 [ 63,66 ] ), and some kinds of lithium compounds (LiBO 2 , [ 67 ] LiAlO 2 , [ 40,41,68‐71 ] Li 2 MoO 4 , [ 72 ] Li 2 ZrO 3 , [ 43,73‐74 ] Li 3 VO 4 , [ 75‐76 ] Li 3 PO 4 , [ 77‐78 ] Li 2 SiO 3 , [ 79‐81 ] Li 4 SiO 4 , [ 82 ] Li x Ti 2 O 4 , [ 70 ] Li 4 Ti 5 O 12 , [ 83‐84 ] LiZr 2 (PO 4 ) 3 , [ 85 ] and LiAlF 4 [ 54 ] ) and carbon materials (traditional carbon materials, [ 86‐88 ] modified carbon materials, [ 89‐90 ] carbon nanotube materials, […”