| 1 | Synthesis characterization and improved electrochemical performance of Li2FeSiO4/C as cathode for lithium-ion battery by metal doping显示文摘In this paper, Li2FeSi0.98M0.02O4/C(M = Mg, Zn, Co, Mn, Ni) was synthesized as cathode material for lithium ion battery by solid-state method. The results show that the materials doped with Mg and Zn at the Si-sites have good initial discharge capacity. Then Li2FeSi1-xMxO4/C(M = Mg, Zn;x = 0.01, 0.02, 0.03, 0.05) were also synthesized via solid-state method. It is concluded that Li2FeSi0.99Mg0.01O4/C and Li2FeSi0.98Zn0.02O4/C have better initial discharge capacity which is 125 mAh/g and 166.2 mAh/g, respectively. The capacity of Li2Fe0.98Zn0.02SiO4/C is 157.3 m Ah/g after 10 cycles at 0.1 C, and the capacity retention rate is 94.6%. The Li^+ diffusion coefficient of Li2FeSi0.98Zn0.02O4/C is higher than that of pure phase materials by one order of magnitude. The Li2FeSi0.99Mg0.01O4/C and Li2FeSi0.98Zn0.02O4/C were tested by XRD and SEM. XRD patterns indicate that the crystal structure of Li2FeSiO4 is not changed after being doped with metal ion at the Si-site. The SEM image indicates that no obvious agglomeration is detected in these materials. Li2FeSi0.98Zn0.02O4/C processes better electrochemical performance analyzed by EDS、XPS and FT-IR spectra. The data prove that Si4+ is successfully replaced by Zn^2+ in the crystal structure of Li2FeSiO4. | Ling Li Enshan Han Shunpan Qiao Hui Liu Yake Shi Weiliang Yuan | 2019 | Progress in Natural Science:Materials International2019，29，2： | 2 |
| 2 | Dynamics of the SARS-CoV-2 antibody response up to 10 months after infection显示文摘COVID-19 caused by SARS-CoV-2 infection has caused substantial morbidity and mortality worldwide and paralyzed the international economy.Understanding the magnitude and duration of the antibody response to SARS-CoV-2 is important to achieve a balance between curbing the pandemic and minimizing adverse effects on society.1 Although the antibody response to SARS-CoV-2 within 9 months has been extensively studied,2,3,4,5,6 little is known about the magnitude and kinetics of antibody responses for over 9 months.Moreover,with limited observations over 9 months(n<100),2,7,8 several studies have produced inconsistent conclusions about antibody dynamics,suggesting different rates of antiviral antibody positivity at the last follow-up.2,7,8 These studies have been limited by a lack of measurement of neutralizing antibodies(NAbs),7 of inclusion of mild or asymptomatic cases,2,8 and of further exploration of potential predisposing factors for antibody dynamics.2,7 Considering the individual heterogeneity(such as disease severity)8 and time-dependent nature1 of the immune response,in-depth characterization of SARS-CoV-2 antibody kinetics across disease severity groups over a long period is urgently needed.Therefore,we repeatedly tested IgM,IgG,viral spike protein receptor-binding dom(anti-RBD)IgG,and NAb titers in COVID-19 patients during a follow-up period of up to 10 months and explored potential predisposing factors of antibody titers during follow-up. | Hao Wang Yu Yuan Mingzhong Xiao Li Chen Youyun Zhao Haiwei Zhang Pinpin Long Yana Zhou Xi Xu Yanshou Lei Bihao Wu Tingyue Diao Hao Cai Li Liu Zuoyu Shao Jingzhi Wang Yansen Bai Kai Wang Miao Peng Linlin Liu Shi Han Fanghua Mei Kun Cai Yake Lei An Pan Chaolong Wang Rui Gong Xiaodong Li Tangchun Wu | 2021 | Cellular & Molecular Immunology2021，18，7： | 1 |
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