Why the damage caused by the low temperature to the lithium battery is not reversible?

Source: 2020 - 04 - 01 'hits: why the damage caused by the low temperature to the lithium battery is not reversible? In the following order. 1. Why is it cold lithium ion battery? 2. Low temperature lithium ion battery of the irreversible capacity loss mechanism of low temperature aging 3. Solid electrolyte can handle the irreversible loss in low temperature? ( In order to facilitate direct access to the reference source, at the end of each section lists the corresponding references) 1. Why is it cold lithium ion battery? We first need to identify two problems: lithium ion battery is a messy electrochemical system. See the synthetic data: solid data: the transition metal oxides are data, optical fiber, graphite negative data gaps, etc. Organic electrolyte (liquid information: Including the lithium salts, solvents and other additives) And so on. 2. The working principle of lithium-ion battery includes two basic processes: electrochemical reaction and mass transfer process of charged particles. As a result, we found that the lithium ion battery will be affected by the temperature data and process the bondage of solid data can not escape 'heat bilges cold shrink, Ion is not easy to embed, difficult to escape, and through the aperture) ; Fluid data cannot from low temperature viscosity increase and even the fate of the condensation ( Ion 'can not run) ; Charged particle mass transfer rate and electrochemical reaction rate must be reduced. Under the condition of low temperature, lithium ion battery components compatibility would be affected. Therefore, in the face of the environment of low temperature and lithium ion batteries will be how 'fragile'. 'tower yunus' lithium ion battery to work against greater resistance ( Increased resistance) , the efficiency will decline, Practical ability of agile down) Too close, if forced to ( Large current charge and discharge) Resistance and capacity decline faster. Lithium ion battery of the irreversible capacity loss at low temperature low temperature aging mechanism of lithium ion batteries' cold ', means that the low temperature not only reduces the working efficiency of the lithium ion battery, also the data of the lithium ion battery, more or less damage. Just like the human body, a cold or fever can cause cellular damage, only the body has its own system to repair and replace damaged cells. But no such talent lithium ion batteries. Unlike reversible electrochemical reaction in the battery, main problem of 'irreversible damage can be divided into the data structure of irreversible damage and active material ( Especially the circular lithium) Permanent damage. 1. We could have such a problem: the low temperature will result in lithium ion battery irreversible loss during don't use? Pictures from the network, invasion to delete the aging mechanism of lithium ion batteries are divided into calendar aging and aging two cycles. Calendar aging refers to static non-operating storage during aging. It is mainly affected by temperature and SOC ( Lithium ion storage in negative graphite) : in the high temperature and SOC, the stability of the electrode/electrolyte interface is reduced, increase the dissolution of active metal ions and side effects, oxygen evolution, electrolyte, SEI - Thickening of the surface. Low temperature to a certain extent, therefore, can keep a calendar of aging. That is to say, do not use during, if you don't comment on mechanical damage caused by cold stress ( Thermal expansion and cold contraction) , low temperature condition itself, is not irreversible loss of lithium-ion batteries. Lithium ion battery, in other words, low temperature aging is mainly caused by dynamic charge and discharge process to form the cycle of aging.