RESUMO
Lithium batteries that utilize a lithium anode and a high voltage cathode are highly required to meet the growing demand for electrification of transportation. High voltage lithium cobalt oxide (LiCoO2, LCO) can be a promising choice for lithium batteries with high energy and power. However, intrinsic structural instability at high voltages (>4.2 V) leads to significant capacity loss during the repeated cycles of charge-discharge. Herein, a simple and effective method has been proposed to prepare an artificial protective layer of LCO, enabling the LCO to achieve long-term cycle stability at 4.5 V. It is found that carbon monofluoride reacts with LCO via defluorination at 400 °C to form a LiF-C layer on LCO, which suppresses side reactions at the electrolyte/electrode interface. Moreover, the LiF-C layer plays a key role in not only facilitating charge transport but also restricting Co dissolution from the cathode. The Li//LiF-C coated LCO cells deliver an initial discharge capacity of 186 mAh g-1 at 0.1C and exhibit excellent cycling and rate performance: 161 mAh g-1 after 180 cycles (90% of the initial value at 0.5C) and 115 mAh g-1 at 10C (63.2% of the 0.1C capacity).
RESUMO
Inflammatory pseudotumors (IPTs) are uncommon, mass-forming lesions, predominantly involving the lung and orbit. Although the incidence of IPTs is rare in the abdomen and pelvis, they can be encountered as enhancing, soft-tissue lesions, mimicking malignancy or fibrosclerosing disease. Generally, they exhibit a wide range of nonspecific imaging features in various organs. Preoperative imaging diagnosis of IPTs in appropriate clinical settings may help determine proper patient management. In this article, we review radiologic findings of IPTs in the abdominopelvic cavity, including the liver, spleen, kidney, gastrointestinal tract, mesentery, pelvis, and retroperitoneum.
RESUMO
Objective: This study aimed to evaluate the ultrasonography (US), cytology, and thyroglobulin (Tg) measurement results of nodal metastasis in patients showing unclear US or cytology results of primary papillary thyroid carcinoma (PTC). Methods: From January 2016 to December 2018, 179 patients underwent US-guided fine-needle aspiration (FNA) to diagnose lymphadenopathy in the neck. Among them, 36 patients underwent subsequent total thyroidectomy and nodal dissection, and cervical lymph node (LN) metastasis from PTC was confirmed. However, two patients were excluded because of mismatch between the US and pathological findings of LNs. US images and cytological slides for metastatic LNs were retrospectively analyzed, and serum and FNA Tg levels for metastatic LNs were investigated using data from the electric medical records. Primary PTC patients with suspicious results on both US and cytology were classified as the clear group, and the remaining patients were classified as the unclear group. Results: Of the 34 patients, 24 had clear results of primary PTC on both US and cytology (clear group), whereas 10 had unclear results of primary PTC on US or cytology (unclear group). Of the 10 patients in the unclear group, seven had suspicious nodal metastasis from PTC on cytology after US-guided FNA of the cervical LN, and the remaining three had negative cytology but a positive Tg measurement. Metastatic LNs with cystic change tended to show a positive Tg measurement but negative cytology. Conclusions: The combination of US, cytology, and Tg measurement is necessary for diagnosing nodal metastasis from PTC. In cases with unclear primary PTC on US or cytology, the detection of nodal metastasis may be helpful for assessing primary PTC.
