Effect of low-pressure environment on thermal runaway behavior of NCM523/graphite pouch cells with different overcharge cycles

Xie, Song; Gong, Yize; Li, Guishu; Ping, Xianke

doi:10.1016/j.est.2022.105444

Cited by 9 publications

(2 citation statements)

References 40 publications

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“…It is found that the (003) diffraction peak of SNCM523 is shifted to the left relative to that of pristine NCM523 (Figure S3b) due to the Li deficiency in the Li layer, resulting in increased electrostatic repulsion between adjacent O-layers . The merging of (006)/(102) doublets indicates (Figure S3c) that the SNCM523 cathode material has lost its original layered structure . The Li + loss of SNCM523 was also evidenced by the inductively coupled plasma optical emission spectrometry (ICP–OES) (Figure S4), showing that the Li/TM ratio decreased from 1.05 to 0.86.…”

Section: Resultsmentioning

confidence: 93%

“…28 The merging of (006)/(102) doublets indicates (Figure S3c) that the SNCM523 cathode material has lost its original layered structure. 29 The Li + loss of SNCM523 was also evidenced by the inductively coupled plasma optical emission spectrometry (ICP−OES) (Figure S4), showing that the Li/TM ratio decreased from 1.05 to 0.86. Compared with SNCM523, new diffraction peaks near 19 and 30°appear in the XRD patterns of HSNCM523 (Figure 2b), which are associated with the diffraction peaks of Ni 0.5 Co 0.2 Mn 0.3 (OH) 2 (Figure S5a).…”

Section: ■ Results and Discussionmentioning

confidence: 96%

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Topotactic Transformation of Surface Structure Enabling Direct Regeneration of Spent Lithium-Ion Battery Cathodes

et al. 2023

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Recycling spent lithium-ion batteries (LIBs) has become an urgent task to address the issues of resource shortage and potential environmental pollution. However, direct recycling of the spent LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM523) cathode is challenging because the strong electrostatic repulsion from a transition metal octahedron in the lithium layer provided by the rock salt/spinel phase that is formed on the surface of the cycled cathode severely disrupts Li + transport, which restrains lithium replenishment during regeneration, resulting in the regenerated cathode with inferior capacity and cycling performance. Here, we propose the topotactic transformation of the stable rock salt/spinel phase into Ni 0.5 Co 0.2 Mn 0.3 (OH) 2 and then back to the NCM523 cathode. As a result, a topotactic relithiation reaction with low migration barriers occurs with facile Li + transport in a channel (from one octahedral site to another, passing through a tetrahedral intermediate) with weakened electrostatic repulsion, which greatly improves lithium replenishment during regeneration. In addition, the proposed method can be extended to repair spent NCM523 black mass, spent LiNi 0.6 Co 0.2 Mn 0.2 O 2 , and spent LiCoO 2 cathodes, whose electrochemical performance after regeneration is comparable to that of the commercial pristine cathodes. This work demonstrates a fast topotactic relithiation process during regeneration by modifying Li + transport channels, providing a unique perspective on the regeneration of spent LIB cathodes.

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Section: Resultsmentioning

confidence: 93%

Section: ■ Results and Discussionmentioning

confidence: 96%