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Han, Jung-Gu,Lee, Jae Bin,Cha, Aming,Lee, Tae Kyung,Cho, Woongrae,Chae, Sujong,Kang, Seok Ju,Kwak, Sang Kyu,Cho, Jaephil,Hong, Sung You,Choi, Nam-Soon The Royal Society of Chemistry 2018 ENERGY AND ENVIRONMENTAL SCIENCE Vol.11 No.6
<P>High-capacity Si-embedded anodes and Li-rich cathodes are considered key compartments for post lithium-ion batteries with high energy densities. However, the significant volume changes of Si and the irreversible phase transformation of Li-rich cathodes prevent their practical application. Here we report lithium fluoromalonato(difluoro)borate (LiFMDFB) as an unusual dual-function additive to resolve these structural instability issues of the electrodes. This molecularly engineered borate additive protects the Li-rich cathode by generating a stable cathode electrolyte interphase (CEI) while simultaneously tuning the fluoroethylene carbonate (FEC)-oriented solid electrolyte interphase (SEI) on the Si-graphite composite (SGC) anode. The complementary electrolyte design utilizing both LiFMDFB and FEC exhibited an improved capacity retention of 85%, a high Coulombic efficiency of ∼99.5%, and an excellent energy density of ∼400 W h kg<SUP>−1</SUP> in Li-rich/SGC full cells at a practical mass loading after 100 cycles. This dual-function additive approach offers a way to develop electrolyte additives to build a more favorable SEI for high-capacity electrodes.</P>
Syringoma localized to the umbilicus
( Sang-woo Park ),( Sang-kyung Lee ),( Eui-sung Jung ),( Hyun-bin Kwak ),( Su-kyung Park ),( Jin Park ),( Han-uk Kim ),( Seok-kweon Yun ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.1
Syringomas are relatively common and benign appendageal tumors derived from the intraepidermal ducts of eccrine glands. They occur predominantly in women, presenting at puberty or later in life. Syringomas typically appear as soft, skin-colored to yellow-brown papules on the eyelid, but rarely can arise on the skin in other areas such as scalp, forehead, cheeks, trunk, extremities, genitalia, and buttocks. Although eruptive syringomas may also involve the umbilicus, it is very rare for the lesions to be only limited to this region. Herein, we report a rare and interesting case of a patient with umbilical syringomas. A 25-year-old man presented with numerous quiescent, localized papules on his umbilicus, with a history of onset four years ago. The patient was otherwise asymptomatic and healthy. There was no family history of similar skin lesions. On physical examination, we observed multiple 1-2 mm sized, firm, light-brown colored papules on the umbilicu. The histopathological examination of the biopsy sample revealed multiple ductal and small cystic structures, dispersed within a fibrous connective tissue stroma in the upper dermis. The ductal and cystic spaces were lined by 1 to 2 rows of flattened epithelial cells. Some of the cysts with their small comma-like tails, resembled tadpoles. The patient was diagnosed with localized umbilical syringomas, however he refused further management.
Linear facial lichen sclerosus et atrophicus mimicking scleroderma ‘en Coup de Sabre’
( Sang-woo Park ),( Sang-kyung Lee ),( Eui-sung Jung ),( Hyun-bin Kwak ),( Su-kyung Park ),( Jin Park ),( Han-uk Kim ),( Seok-kweon Yun ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.1
Localized scleroderma is a inflammatory disease which ultimately leads to a scar-like sclerosis. When linear scleroderma occurs on the forehead, it is referred to as scleroderma ‘en coup de sabre’, given the resemblance of the skin lesions to the stroke of a sabre. We now report an Korean patient who were clinically suspected of ‘en coup de sabre’, but the histologic results confirmed the diagnosis of lichen sclerosus et atrophicus (LSA). A 52-year-old man presented with a several months history of asymptomatic atrophied patch on forehead. He was otherwise healthy, and did not have a family history of autoimmune diseases. There was no past history of trauma. Physical examination revealed linear vertically distributed porcelain white atrophied patch on forehead. The genital, perianal and mucosal areas were normal. A skin biopsy from the lesion showed hyperkeratosis, thinning of the epidermis, loss of the rete ridges, focal basal cell vacuolization, hyalinized collagen of the papillary dermis along with a moderate lymphocytic infiltrate. Based on the clinical and histological findings, this case was diagnosed as linear LSA of the forehead. After the diagnosis was made, the patient was prescribed with topical diflucortolone valerate 0.3% and partial improvement was noted at the 4-months follow up.
Porokeratosis at the site of previous moxibustion: a case report
( Sang-woo Park ),( Sang-kyung Lee ),( Eui-sung Jung ),( Hyun-bin Kwak ),( Su-kyung Park ),( Jin Park ),( Seok-kweon Yun ),( Han-uk Kim ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.1
Porokeratosis is characterized by annular keratotic rims. The histopathological finding that characterizes this condition is the cornoid lamella, which is a column of parakeratotic cells. It has been suggested that external stimuli, including immunosuppressive therapies, ultraviolet light, and trauma may serve as etiopathogenetic contributors. We report a case of porokeratosis occurring at the site of previous moxibustion. A 59-year-old man visited our clinic with an annular plaque on the right buttock. The plaque showed an atrophic center with a slightly elevated keratotic border. The patient revealed a history of undergoing moxibustion of the lower back and buttocks, 8 years prior to presentation. Unfortunately, he experienced a burn at the site of moxibustion, which was located on the right buttock, and developed a brownish plaque at the site of the burn. The patient was healthy and denied a family history of similar skin lesions at his initial visit. His histopathological examination revealed hyperkeratosis, acanthosis, and cornoid lamella in the epidermis without a granular layer beneath it. Based on the clinical and histopathological findings, the patient was diagnosed with porokeratosis and was treated with 3 cycles of 0.05% ingenol mebutate gel. The lesion decreased in size following 2 weeks of treatment. The residual lesion was treated with carbon dioxide laser, which led to the disappearance of the keratotic annular plaque.
A case of elephantiasis nostras verrucosa on great toe
( Sang-woo Park ),( Sang-kyung Lee ),( Eui-sung Jung ),( Hyun-bin Kwak ),( Su-kyung Park ),( Jin Park ),( Han-uk Kim ),( Seok-kweon Yun ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.1
Elephantiasis nostras verrucosa is an uncommon disorder that is characterized by verrucous changes with papillomatosis and hyperkeratosis. The affected skin acquires a mossy or cobblestone-like appearance and discrete fibrous papules or plaques may develop. Recurrent cutaneous infections, tumor obstructions, previous surgeries, radiations, and obesity can lead to chronic lymphatic obstruction and edema. A 63-year-old man presented with non-pitting edema and hyperkeratotic warty plaque in left great toe for 1 month. The patient had been diagnosed with diabetes for 30 years and had a history of diabetic foot and recurrent localized infection on the left great toe for 5 years. He denied history of other trauma, radiation therapy, and travel outside of Korea before. Staphylococcus aureus was identified on the bacterial culture performed with discharge, and fungal culture was negative. The histopathological examination of the biopsy sample revealed hyperkeratosis, papillomatosis, and pseudoepitheliomatous hyperplasia of the epidermis. Diffuse fibrosis and dilated lymphatic channels are observed in the dermis. Periodic acid-Schiff, and acid fast bacilli stains were negative for fungal and mycobacterial organisms. Based on the clinical and histopathological findings, the patient was diagnosed with elephantiasis nostras verrucosa. The patient was treated with topical salicylic acid, and showed little improvement after 3 month.