In-Situ Polymerized Binder: A Three-in-One Design Strategy for All-Integrated SiO_x Anode with High Mass Loading in Lithium Ion Batteries

Abstract

The development of SiO x electrode with high mass loading, which is an important prerequisite for practical lithium-ion batteries, remains an arduous challenge by using existing binders. Herein, we propose a three-in-one design strategy for binder systems in allintegrated SiO x electrodes. "Hard" poly(furfuryl alcohol) (PFA) and "soft" thermoplastic polyurethane (TPU) are interweaved into 3D conformation to confine SiO x particles via in-situ polymerization. In the electrode system, PFA works as a framework and TPU servers as a buffer, and H-bonding interactions are formed between the components. Benefiting from the three-pronged collaborative strategy, PFA-TPU/SiO x electrode exhibits an areal capacity of 2.4 mAh cm −2 at a high mass loading of >3.0 mg cm −2 after 100 cycles. Such a binder system is also extended to other potential metal oxides anode with high mass loading, e.g., Fe 2 O 3 and SnO 2 , thus shedding light on rational design of functional polymer binders for high-areal-capacity electrodes.

Sub‐Thick Electrodes with Enhanced Transport Kinetics via In Situ Epitaxial Heterogeneous Interfaces for High Areal‐Capacity Lithium Ion Batteries

“…capacity, high rate capability, long shelflife, including low-cost, are some of the main parameters required for rating the activity of electrode material LIBs. [6][7][8][9] For instance, whether it is the state-of-art graphite or the recently most researched transition metal compounds and alloymetal materials as promising anode material for LIB, [10][11][12][13][14][15] the LIB storage properties of these electrodes are usually evaluated by the gravimetric capacity based on active material. [16][17][18][19] To alleviate LIBs with high-areal-energy and/or power densities, the electrode architectural design and the chemistry of the electrode materials require further optimization.…”

SiOx Anode: From Fundamental Mechanism toward Industrial Application

“…Si-based anode is fragile because of its drastic volume expansion, therefore increasing the mass loading remains a question that possibly can be solved by binders. In 2021, Lin's group [67] proposed a three-in-one design strategy for binder systems in all-integrated SiO x electrodes (Figure 8f). They used poly furfuryl alcohol (PFA) and thermoplastic polyurethane (TPU) as polymers with different flexible and hardness grade to construct a 3D conformation, which confined SiO x particles by in-situ polymerization (Figure 8d,g-j).…”

Constructing a Resilient Hierarchical Conductive Network to Promote Cycling Stability of SiOx Anode via Binder Design

“…[16] Lin et al utilized a three-in-one design strategy to prepare all-integrated SiO x anode with high mass loading. [17] However, simply tuning mechanical properties of binders cannot fully address the existing issues as nonconductive binders are unable to perform as a well-connected electron transport network between active materials.…”