Figure 6. The illustration of mechanical integrity of LA136D thin-film cathodes at high temperatures. (a) and (b) are the schematics of slurry-coated cathodes experienced in the high-temperature environment, binder with a low gas production rate in thermal decomposition is beneficial to maintain the mechanical integrity in TBs operation (a), while a binder with a high gas production rate always leads to electrode cracks (b); (c) the digital picture of LA136D thin film cathode after discharging, it shows an integrity electrode surface; (d) the cross-section of LA136D single-cell after discharging; (e) the comparison of ψ and χ of binder in the recent slurry-coating works.