Heterostructured Nanoglue Design for Durable Lithium‐Ion Battery Anodes

Abstract Hybrid and heterostructures exhibit intriguing and significant properties that can endow unique properties to high‐performance batteries. However, their applications are often hampered by limited structural stability due to inevitable material agglomeration and structural collapse during repeated electrochemical cycles. Here, an efficient strategy to utilize an intermediate nanoglue to bond the substrate and heterojunction phase and increase the overall structural stability is reported. After screening the possible Fe‐based oxides, tunnel‐type FeOOH satisfies the principle of relatively high affinity to both Ti 3 C 2 O x support and Fe 3 O 4 phase, thus strengthening heterostructure stability. Furthermore, functional FeOOH quantum dots as nanoglue and graft them onto high‐surface‐area Ti 3 C 2 O x support is experimentally utilized, then load high‐capacity Fe 3 O 4 nanoparticles onto the nanoglue. The designed heterostructured nanoglue not only yields abundant heterojunctions with continuous channels for ion/electron transfer but maintains excellent electrochemical reversibility. Serving as anode for lithium storage, Ti 3 C 2 O x /FeOOH/Fe 3 O 4 hybrid enables a high discharging capacity of 790.4 mAh g −1 at 1.0 A g −1 after 500 cycles and superior cycling stability. The design principle is general and can be expanded to other hybrid materials.