Friction And Wear Testing Machine
The machine is used to evaluate the loading capacity of lubricants in the process of sliding friction o na contact point under very high pressure. The above mentioned capacity including 3 datas to be tested: the maximum load PB under the unstuck condition, sintered load Pd and comprehensive value of wearing during friction ZMZ.
Friction And Wear Testing Machine,Wear Testing Equipment,Four Ball Friction Testing Machine,Friction And Wear Tester Jinan Chenda Testing Machine Manufacturing Co., Ltd. , https://www.jncdtester.com
What problems will the lithium battery break through with new technologies?
Xi'an Jiaotong University develops high-coulombic efficiency silicon negative lithium battery
Recently, Zheng Xiaoquan, a professor at the School of Electrical Engineering of Xi'an Jiaotong University, and Cui Wei, a professor at the School of Materials Science at Stanford University, and Li Ju, a professor at the Department of Nuclear Engineering at the Massachusetts Institute of Technology, worked together to coat the outer surface of the nano-silicon anode through a special method. The artificial titanium dioxide nano-layer is used to synthesize a silicon-structure negative electrode with high mechanical strength, and a silicon negative electrode full-battery with high-pressure real density is prepared, which realizes twice the volume specific capacity and twice the mass specific capacity of the conventional graphite negative electrode.
At present, commercial lithium-ion batteries are only used for low-order power requirements, and silicon is expected to be a large-capacity anode material for next-generation lithium-ion batteries because its theoretical specific capacity is more than 10 times that of conventional graphite anodes. However, the problem of low coulombic efficiency of the silicon negative electrode during charge and discharge has not been overcome.
After experimental testing, the new result of the titanium dioxide shell mechanical strength is five times that of amorphous carbon, can achieve a stable Coulomb efficiency of more than 99.9%, to meet the industrial application standards, will effectively promote the commercial bulk of silicon in the battery industry application. The results were recently published in the Energy and Environmental Science. (Zhonghe)
Germany develops new sensor technology to reduce lithium battery weight and cost
German engineers have developed new sensor technologies that can reduce the weight and cost of electric vehicles and other types of lithium-ion batteries.
Philippe Dotst is a member of Ruhr University's Power Systems Technology and Electrical Mechatronics research team, which developed a new concept for monitoring battery current and voltage, reducing the battery's technical burden, and adding New features.
Typically, an electric vehicle battery consists of a single battery that can contain up to 12 batteries, each battery being monitored by its own voltage sensor. Sensors are important for monitoring lithium batteries in batteries, and if they are overheated or overworked, they may burn.
In a typical electric vehicle battery, there is a current sensor and multiple voltage sensors to do the job, and the sensor is a considerable weight and cost driver.
To reduce weight, Dost and his colleagues proposed a way to reduce the number of sensors that previously required electric vehicle batteries to monitor current and voltage, regardless of how many cells are in the battery.
Researchers say the sensor system they developed can be extended to batteries with different cell counts. It can also be applied to other battery types such as tablets or laptops, wireless power tools, uninterruptible power systems and solar energy storage systems to reduce their weight and cost and increase battery life.
Next, Ruhr University engineers will continue to work to improve the technology, more closely evaluate their prototypes and replace individual components to meet the requirements of the automotive industry.