Impact of the sintering additive Li₃PO₄ on the sintering behaviour, microstructure and electrical properties of a ceramic LATP electrolyte

Abstract

Competitive all solid-state batteries (ASSB) require particulate, ternary composite cathodes, consisting of a ceramic active material, ceramic solid-state electrolyte (SSE) and an electrical conductor, to achieve high energy densities. Firmly...

Structural Analysis of the LiCoPO4 Electrode/NASICON-Type Li1.3Al0.3Ti1.7(PO4)3 Solid Electrolyte Interface

“…Previously, very high actual density was achieved by sintering NASICON-type solid electrolytes such as LTP and LATP at 800 °C in the presence of Li 3 PO 4 additives because of their promotive effect on the anisotropic crystal growth. , In addition, Li 3 PO 4 formed at LCP/LATP does not interfere with Li-ion transport because it can act as a Li-ion conductor, although the conductivity is not very high at 3.9 × 10 –9 S/cm. Thus, the Li 3 PO 4 formed by the decomposition of LCP at the LCP/LATP boundaries is key for the densification of LCP and LATP grains and the formation of Li-ion conducting interfaces. , …”

“…In addition to the densification and bonding of LCP and LATP, the formation of amorphous reaction layers composed of Li, O, P, and Co was clearly imaged at their boundaries in the TEM images and SAED and EDS mapping. XAFS and EELS analyses identified the major species of amorphous reaction layers to be CoO and Li 3 PO 4 ; the latter is known as a promoting agent for crystal growth of NASICON-type solid electrolytes LiTi 2 (PO 4 ) 3 (LTP) and LATP. , …”

“…XAFS and EELS analyses identified the major species of amorphous reaction layers to be CoO and Li 3 PO 4 ; the latter is known as a promoting agent for crystal growth of NASICON-type solid electrolytes LiTi 2 (PO 4 ) 3 (LTP) and LATP. 16,17 ■ EXPERIMENTAL METHODS Preparation of the LCP/LATP Composite. LCP and LATP from Toshima Manufacturing and boron nitride powder from Fujifilm Wako Pure Chemical were used as received.…”

Optimizing Li1.3Al0.3Ti1.7(PO4)3 Particle Sizes toward High Ionic Conductivity

“…The observed and calculated XRD patterns showed fairly good agreement with good reliability factors ( R wp = 9.36%). There was an AlPO 4 phase in the samples, which might originate from the decomposition 18Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 ↔ 17Li 1.2 Al 0.2 Ti 1.8 (PO 4 ) 3 + 2AlPO 4 + Li 3 PO 4 or from the intermediate reaction Al 2 O 3 + 2NH 4 H 2 PO 4 → 2AlPO 4 + 2NH 3 ↑ + 3H 2 O↑. , AlPO 4 cannot conduct Li + , which is harmful for obtaining highly conducive LATP ceramic electrolyte. ,− The phase contents are given in Figure b. The highest occupation amount of AlPO 4 phase is 2.28% in the medium-sized sample, which acted as a binder between grains to facilitate the densification of ceramics. , The contents were 1.71% and 1.24% in coarse and fine samples.…”

Facile Route to Synthesize a Highly Sinterable Li1.3Al0.3Ti1.7(PO4)3 Solid Electrolyte

“…The obtained characteristic information on bulk (bulk ionic conductivity) and grain boundary (capacitance, as shown in Table S4) in this study were in good accordance with the literature. 28,29 The bulk ionic conductivity of LATP reflects the efficiency of Li + transport in the LATP lattice, which is composed of octahedral TiO 6 and tetrahedral PO 4 connected to form a three-dimensional (3D) network as shown in Figure 7a. These connections form cavities in which Li + ions reside and bottlenecks through which the Li + ions pass.…”