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Anchoring Sb6O13 Nanocrystals on Graphene Sheets for Enhanced Lithium Storage

“…Since both antimony element and oxygen element can be combined with lithium to form a corresponding lithiated compound, it is expected that the naturally occurring compound Sb 6 O 13 will exhibit a high theoretical specific capacity when used as a potential electrode for LIBs. Sb 6 O 13 has a defective pyrochlore-tye structure, and it can be represented as a structural formula of Sb 3+ Sb 5+ 2 O 6 O′ 0.5 , which can be transformed easily from Sb 2 O 3 or Sb 2 O 5 · n H 2 O ( n = 0–4) through heat treatment under ambient atmosphere. Similar to Sb 2 O 3 and Sb 2 O 4 , theoretically, Sb 6 O 13 can not only undergo the reversible conversion reaction (eq ) but also utilize the alloying/dealloying reaction (eq ) reversibly. On the basis of the combination of reversible reaction eqs and , Sb 6 O 13 will get a large theoretical specific capacity of 1270 mA h g –1 , which is 3.4 times larger than that of graphite.…”

“…Similar to Sb 2 O 3 and Sb 2 O 4 , theoretically, Sb 6 O 13 can not only undergo the reversible conversion reaction (eq ) but also utilize the alloying/dealloying reaction (eq ) reversibly. On the basis of the combination of reversible reaction eqs and , Sb 6 O 13 will get a large theoretical specific capacity of 1270 mA h g –1 , which is 3.4 times larger than that of graphite. On the basis of the nanosize effect in nanostructured electrode materials, which leads to conversion reaction mechanism with lithium, ,,, eq would also be made reversible electrochemically when the morphology and structure of the Sb 6 O 13 phase were controlled properly, thereby rendering the reversible capacity of Sb 6 O 13 close to 1270 mA h g –1 (7231 mA h cm –3 ).…”

Mn‐Substituted Tunnel‐Type Polyantimonic Acid Confined in a Multidimensional Integrated Architecture Enabling Superfast‐Charging Lithium‐Ion Battery Anodes

“…[ 18–22 ] Actually, PAA is often used as a superior inorganic ion‐exchanger because of high‐efficiency cation exchange capability with favorable ion selectivity. [ 23–25 ] Thanks to this specific property, it enables the element doping/substitution into the tunnel sites of PAA crystal framework, while making it feasible to yield a modulation on its physicochemical properties. [ 11,22,26 ] For example, Ozawa prepared bismuth‐substituted PAA (H 1‐3 x Bi x SbO 3 · n H 2 O) through a solution processing, and they founded that the Bi‐substitution into the tunnel sites can greatly enhance the proton conductivity of PAA with almost two orders of magnitude.…”