Method for testing and evaluating electrolyte system performance of silicon-based anode half-battery
A technology for silicon-based negative electrode and battery performance, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., and can solve problems such as the performance of difficult electrolyte layers.
Active Publication Date: 2019-05-10
INST OF PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology
[0005] However, the current commercial silicon-based materials mostly use nano-silicon powder, which is mixed with various materials, and it is difficult to systematically and carefully study the performance of the solid electrolyte layer (SEI) film on the silicon surface under different electrolyte systems.
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example 1
[0075] Example 1: The silicon-based negative electrode uses a micro-conical silicon structure with a diameter of 3um and a height of 10um. The electrolyte system is selected as a mixture of 1M LiPF6 dissolved in ethylene carbonate (EC) and dimethyl carbonate (DMC), where EC / DMC is 1:1. The micro-conical silicon structure and the electrolyte system form the first half-cell, and metal lithium is used as the counter electrode to form the second half-cell. After the first half-battery and the second half-battery stand together for 6 hours, a battery performance test is performed. The battery test procedure is to discharge to 25uAh at a constant current of 25uA, rest for 30s, and then charge at a constant current of 25uA to 2V, and cycle for 50 cycles. After the cycle, the battery was disassembled, and after repeated washing with DMC in the glove box, nano-conical silicon was formed, which was left to stand for 24 hours, dried, and scanned electron microscopy (SEM) and X-ray photo...
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The invention discloses a method for testing and evaluating the electrolyte system performance of a silicon-based anode half-battery. The method comprises the steps of: preparing a silicon-based anodehalf-battery by utilization of a silicon-based anode in the micro-nanostructure template form made of a micro-nanostructure having single chemical composition of silicon and single morphology and electrolyte to be evaluated, and preparing a cathode half-battery by utilization of metal as a counter electrode; running the prepared silicon-based anode half-battery at set temperature and under a setbattery performance test program, and performing a battery performance test; taking out a micro-nanostructure template from the running silicon-based anode half-battery, and cleaning the micro-nanostructure template; and performing set analysis onto the cleaned micro-nanostructure template. By utilization of the method in the invention, the performance of a silicon surface solid electrolyte layerin different electrolyte system conditions can be researched systematically and meticulously.
Description
technical field [0001] The present application relates to the field of lithium-ion batteries, and more specifically, the present application relates to a method for testing and evaluating the performance of an electrolyte system of a silicon-based negative electrode half-cell. Background technique [0002] With the rapid development of the economy, the global energy situation is becoming increasingly severe. The demand for traditional primary energy such as coal and oil continues to increase, and the damage to the global ecological environment is also intensifying. Therefore, the development and application of clean, low-carbon, environmentally friendly and renewable energy has become a subject that mankind needs to jointly explore. With the development of energy storage technology, the application of renewable energy such as wind energy and solar energy has been greatly improved. At present, lithium-ion batteries, which are relatively hot for energy storage, have been wide...
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Inventor 全保刚闫昭孙悦陆浩李俊杰李泓顾长志
Owner INST OF PHYSICS - CHINESE ACAD OF SCI