Lithium battery thermal runaway creates domino effect, graphene may become 'savior'

by:CTECHi     2021-07-11

In recent years, with the continuous progress of lithium battery technology and the gradual decrease in actual cost, the application of lithium batteries in the field of power tools has increased. At this stage, major manufacturers have put forward the idea of u200bu200bcordless power tools, making lithium batteries There is a broad prospect in the field of electric tools. At the same time, with the rise of artificial intelligence, emerging smart tool products such as lithium battery household products and garden tools have obtained opportunities for rapid development. The application of lithium batteries is no longer limited to a single field. According to industry insiders, the future market trend of lithium battery power tools and garden tools is just like the morning sun. In addition to the promotion of the market and its own potential, the lithium-ionization of power tools has also been supported by national and regional policies. For example, the European Union has long banned the use of nickel-chromium batteries in wireless power tools, and the penetration rate and replacement rate of lithium-ion power tools are far ahead of the domestic market; China has re-established industry standards for the use of lithium batteries in power tools. Cordless lithium battery means that electric tools will develop in the direction of smaller size, lighter weight, lower noise, etc. However, the emergence of 'side effects' is still inevitable, that is, the thermal runaway of lithium ions in lithium batteries. The operating temperature range of lithium ion is between +15 and +45 degrees Celsius. If the temperature exceeds the critical level, it will lead to functional safety, shortened service life, instability, and possible thermal runaway of the battery cell. So how does the lithium ion in the lithium battery cause thermal runaway? If the tool is hit or dropped from a high place, the battery may be deformed; the material will penetrate into the battery, causing an internal short circuit or an external short circuit; Excessive current during overcharging or fast charging is extremely likely to permanently damage the battery. After thermal runaway occurs, just like a domino effect, the energy stored in the battery will be released suddenly, causing a fire. In addition, the larger the number of batteries, the higher the energy density, and the greater the charge and discharge power, it means that the probability of a fire failure is higher. In order to ensure that the risk of thermal runaway is minimized, researchers at the University of Illinois at Chicago issued a research report showing that graphene materials can absorb oxygen from the lithium-ion battery when it catches fire, and can prevent the oxygen released by the cathode from interacting with the battery. Combining other flammable products inside, thereby reducing the risk of fire and reducing accident losses. Graphene wears a 'fire-proof cloak' for lithium batteries. Graphene composite materials are already one of the key research directions for lithium batteries in the future. How to improve the preparation technology of high-quality graphene so that it can be applied to high energy density and high power density power In the field of lithium-ion batteries, the overall performance of lithium batteries will be greatly improved, and the development of power tools and other related fields will be promoted. At present, domestic companies are actively deploying graphene industrialization. Fangda Carbon has made a number of technological breakthroughs in high-end graphene, and used project construction as a carrier to accelerate the development of new products. , Carbon fiber, graphite thermal conductive sheet and other fields; while Jiawei New Energy displayed the newly developed 'Graphene conductive paste for oil-based lithium battery' at the 13th China International Battery Technology Exchange/Exhibition. , And the 'Graphene conductive paste for oil-based lithium batteries' has been applied to lithium battery products. Of course, it has been the past two years for graphene to 'explodeBringing disruptive changes needs time to verify.

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