Yi Cui

Bio: Yi Cui is an academic researcher from Stanford University. The author has contributed to research in topics: Anode & Lithium. The author has an hindex of 220, co-authored 1015 publications receiving 199725 citations. Previous affiliations of Yi Cui include KAIST & University of California, Berkeley.

An Interdigitated Li‐Solid Polymer Electrolyte Framework for Interfacial Stable All‐Solid‐State Batteries

Abstract: All‐solid‐state lithium metal batteries are prominent candidates for next‐generation batteries with high energy density and low safety risks. However, the traditional planar contact between Li metal and solid‐state electrolytes (SSEs) exhibits substantive void formation and large interfacial morphological fluctuation, causing poor interfacial stability. Here, an interdigitated Li‐solid polymer electrolyte framework (I‐Li@SPE), a pioneering demonstration of 3D interface in polymer‐based all‐solid‐state batteries, is designed, transferring the Li‐SSE interfacial contact from planar to 3D for enhanced interfacial integrity. A smooth and intact 3D Li‐SSE interfacial contact after repeated cycling that precedes planar Li‐SSE contact, is shown. COMSOL simulation indicates I‐Li@SPE reduces local current densities by more than 40% and moderates interfacial variation by more than 50%. As a result, I‐Li@SPE achieves high critical current density of 1 mA cm−2, as well as promising high areal capacity cycling of 4 mAh cm−2 at 0.4 mA cm−2. This work provides a new structure for Li‐SSE composite fabrication and high‐capacity solid‐state Li batteries.

Nanowire batteries for next generation electronics

Abstract: The scaling of electronic devices also requires the evolution of high energy density power sources. By using nanowires, high charge storage materials, which otherwise have mechanical breakage problems due to large structure transformations and volume changes, can be adopted as electrode materials. High power operation can also be possible due to the short lithium insertion distances in the nanowires. We have studied Si and Ge nanowires and demonstrated charge storage capacities several times higher than the graphite anodes used in existing battery technology. LiMn2O4 nanorod cathodes were found to show much higher power rates than commercial powders. Detailed morphology and structure characterization have shown that these improvements are attributed to facile strain relaxation, good electronic contact and conduction, and short Li insertion distances in the nanowire battery electrode. We also developed a Langmuir-Blodgett assembly technique to produce nanowire pillars as battery electrodes, which opens up the possibility for the fabrication of on-chip battery power sources.

Maximum a posteriori speckle filtering of synthetic aperture radar images: A sequential approach

Abstract: In this paper, a sequential speckle filtering method for synthetic aperture radar (SAR) images is proposed. Maximum a posteriori (MAP) estimation is achieved by incorporating a Gamma prior for the underlying signal. By making the shape parameter of the prior distribution adaptive, image features can be well preserved. The effectiveness of the new algorithm is demonstrated with both simulated and real SAR images. Experimental results show that the proposed method not only has comparable speckle reduction performances with classical methods, but also possesses better feature preservation ability. In addition, it runs very fast because of its sequential nature and so is particularly suitable for processing very large images.

N- and O-Doped Carbon with High Selectivity for Electrochemical H2O2 Production in Neutral Condition

Abstract: Improved electrochemical production of hydrogen peroxide is provided with a mesoporous carbon catalyst is both O- and N-doped. The resulting catalyst works pH-neutral solutions to enable applications such as environmental water treatment.

Durable and Adjustable Interfacial Engineering of Polymeric Electrolytes for Both Stable Ni‐Rich Cathodes and High‐Energy Metal Anodes

Abstract: Achieving stable cycling of high‐voltage solid‐state lithium metal batteries is crucial for next‐generation rechargeable batteries with high energy density and high safety. However, the complicated interface problems in both cathode/anode electrodes preclude their practical applications hitherto. Herein, to simultaneously solve such interfacial limitations and obtain sufficient Li+ conductivity in the electrolyte, an ultrathin and adjustable interface is developed at the cathode side through a convenient surface in situ polymerization (SIP), achieving a durable high‐voltage tolerance and Li‐dendrite inhibition. The integrated interfacial engineering fabricates a homogeneous solid electrolyte with optimized interfacial interactions that contributes to tame the interfacial compatibility between LiNixCoyMnzO2 and polymeric electrolyte accompanied by anticorrosion of aluminum current collector. Further, the SIP enables a uniform adjustment of solid electrolyte composition by dissolving additives such as Na+ and K+ salts, which presents prominent cyclability in symmetric Li cells (>300 cycles at 5 mA cm−2). The assembled LiNi0.8Co0.1Mn0.1O2 (4.3 V)||Li batteries show excellent cycle life with high Coulombic efficiencies (>99%). This SIP strategy is also investigated and verified in sodium metal batteries. It opens a new frontier for solid electrolytes toward high‐voltage and high‐energy metal battery technologies.

I and i

Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality. Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

Fast parallel algorithms for short-range molecular dynamics

Abstract: Three parallel algorithms for classical molecular dynamics are presented. The first assigns each processor a fixed subset of atoms; the second assigns each a fixed subset of inter-atomic forces to compute; the third assigns each a fixed spatial region. The algorithms are suitable for molecular dynamics models which can be difficult to parallelize efficiently—those with short-range forces where the neighbors of each atom change rapidly. They can be implemented on any distributed-memory parallel machine which allows for message-passing of data between independently executing processors. The algorithms are tested on a standard Lennard-Jones benchmark problem for system sizes ranging from 500 to 100,000,000 atoms on several parallel supercomputers--the nCUBE 2, Intel iPSC/860 and Paragon, and Cray T3D. Comparing the results to the fastest reported vectorized Cray Y-MP and C90 algorithm shows that the current generation of parallel machines is competitive with conventional vector supercomputers even for small problems. For large problems, the spatial algorithm achieves parallel efficiencies of 90% and a 1840-node Intel Paragon performs up to 165 faster than a single Cray C9O processor. Trade-offs between the three algorithms and guidelines for adapting them to more complex molecular dynamics simulations are also discussed.

疟原虫var基因转换速率变化导致抗原变异[英]／Paul H, Robert P, Christodoulou Z, et al//Proc Natl Acad Sci U S A

Abstract: 抗原变异可使得多种致病微生物易于逃避宿主免疫应答。表达在感染红细胞表面的恶性疟原虫红细胞表面蛋白1（PfPMP1）与感染红细胞、内皮细胞、树突状细胞以及胎盘的单个或多个受体作用，在黏附及免疫逃避中起关键的作用。每个单倍体基因组var基因家族编码约60种成员，通过启动转录不同的var基因变异体为抗原变异提供了分子基础。