A multifunctional separator with Mg(OH)2 nanoflake coatings for safe lithium-metal batteries

Function-directed design of battery separators based on microporous polyolefin membranes

“…153,388 Subsequently, PDA composite coatings including PDA/graphene 389 and PDA/octaammonium POSS 106 have been used to modify separators to regulate the uniform nucleation and growth of dendrites. In addition, other materials with good hydrophilicity such as Mg(OH) 2 nanoflakes 390 and polypyrrole 131 have also been used to modify separators, which enable an uniform Li ion distribution on the Li anode surface in Li metal batteries.…”

“…Improving the ion transfer and homogenizing the ion flow using nanomaterials with strong ion adsorption can also regulate the uniform nucleation and growth of dendrites. 92,390,391 Wu et al designed a functional separator by simply blade-coating polyacrylamide-grafted-GO onto a PP separator. 375 The abundant CO and N–H groups of the polyacrylamide chains can offer high-concentration active sites for the efficient adhesion and homogeneous distribution of Li ions, leading to dendrite-free Li deposition.…”

Surface-Functionalized Separator for Stable and Reliable Lithium Metal Batteries: A Review

“…In addition, it is an efficient and straightforward strategy to control the morphology and growing orientation of Li dendrite. Typically, the coating materials to functionalize the surface of polymer separators can be classified into five or six types: (a) thermally conductive materials [ 63 , 64 , 69 , 94 , 95 , 96 , 97 , 98 ], (b) metals [ 99 , 100 , 101 , 102 ], (c) polymers [ 103 , 104 , 105 , 106 , 107 , 108 ], (d) carbons [ 66 , 109 , 110 , 111 ], (e) metal oxides [ 67 , 88 , 112 , 113 , 114 , 115 , 116 , 117 , 118 , 119 ], and (f) others [ 120 , 121 , 122 , 123 , 124 ] ( Figure 3 ). For electrochemical evaluation, each separator coating material is laminated onto one side or both sides of the polymer separator, using the tape-casting method, physical vapor deposition, etc.…”

Thermosetting High-Rate and High-Safety Polymer/Inorganic Composite Separator for Lithium-Ion Battery through a Fast Scalable Photo Cross-Linking Process

“…Thus, the use of the thermoplastic polymers cannot solve this problem effectively. To tackle this issue, inorganic components such as Al 2 O 3 , , MgO, SiO 2 , , and TiO 2 have been introduced into the polymer matrix to further improve the thermal dimension stability of the separators. − However, the polymer part of the separator is mainly thermoplastic, which bears poor thermal dimension stability, leading to limited enhancement of the thermal stability. , Besides, the inorganic particles are mainly used as a minor component in the composite separator, making limited contribution to improve the thermal stability of the separator. , It is well-known that inorganic materials possess a superior thermal stability to organic materials. However, to our best knowledge, few studies have been reported to utilize inorganic materials as a major component for composite separator fabrication because it is difficult to manufacture a robust freestanding inorganic film with the thickness in the micrometer range.…”

“…Thus, the use of the thermoplastic polymers cannot solve this problem effectively. To tackle this issue, inorganic components such as Al 2 O 3 , 30,31 MgO, 32 SiO 2 , 33,34 and TiO 2 35 have been introduced into the polymer matrix to further improve the thermal dimension stability of the separators. 36−44 However, the polymer part of the separator is mainly thermoplastic, which bears poor thermal dimension stability, leading to limited enhancement of the thermal stability.…”