Widespread network text of lithium batteries questioned […]
Widespread network text of lithium batteries questioned further comprising: Lithium highly toxic, short-lived, explosive, use of harsh conditions; can not be recycled, causing huge environmental pressure ...... really? People's Daily "confirmation" column continues to interview a number of industry experts, search for the truth.
Lithium is highly toxic dangerous goods?
Response: lithium batteries contain highly toxic substances, the impact is far less than the lead-acid battery
"Lithium-ion batteries and lithium batteries strictly speaking conceptually there are still differences." China Automotive Technology and Research Center, chief expert of the field of power battery, battery testing and application technology League Secretary General, senior engineer Wang Fang said, usually it refers to a lithium battery consisting of lithium metal or lithium alloy for the negative electrode, non-aqueous electrolyte battery. Lithium-ion rechargeable battery means a secondary battery, the negative electrode is not used metallic lithium, lithium ions move to rely on the work between positive and negative. However, in everyday life, people used to the lithium-ion battery referred to as lithium batteries or lithium.
It is understood that the promotion of new energy vehicles (including electric cars and plug-in hybrid) mostly use lithium-ion batteries, lithium iron phosphate, which accounted for 80% -90%, three lithium batteries in passenger cars also began on a large scale.
For network transmission article pointed out that lithium batteries are "highly toxic dangerous," saying, Wang Fang retorted, as compared to lithium batteries lead acid, nickel-chromium, nickel-metal hydride batteries and other traditional, does not produce any lead, mercury, cadmium and other toxic harmful heavy metals and substances, relatively less polluting. Of electrolyte and a lithium salt and an organic solvent, mostly non-toxic or low toxicity; but lithium decomposition or hydrolysis products of hydrofluoric acid and other fluorine-containing compounds, certain corrosive and toxic.
On the "toxic lithium batteries, said," China Electronics Technology Group Corporation 18th Research Institute senior engineer Liu Haojie said the lithium-ion battery itself does not contain toxic substances, the carbon anode and the cathode of the basic metal oxide is non-toxic. Since the lithium-ion batteries are sealed system, normal use will not be exposed to these substances. "In any case, the impact is far less than is currently the most widely used lead-acid batteries."
Lithium battery life is short, use of harsh conditions?
Response: The lithium-ion battery life of up to 2000 cycles, the battery management system to limit the "charge-off"
How long the current life of lithium? Shallow shallow discharge and charge overcharge and over discharge if the battery will affect the safety and life of it?
"Factors that determine the life of lithium-ion battery There are many, including the characteristics of the system itself, but also the manufacturing process, use conditions, etc. quality battery system, plus the scientific management system, can achieve a long life." King Fong said, according to 80% capacity fade as the cut-off condition, according to 100% depth of discharge test, the current battery life of up to 2000 basic cycles.
"Refers to overcharge and over discharge the battery during charging and discharging of the voltage exceeds or falls below a predetermined cut-off voltage, battery life and performance will bring harm." Fang said, but the battery in the BMS battery management system will be restricted and protected , when the low temperature limits for charging the battery, recharging heating to a suitable temperature. Fang said that in order to ensure the safety of lithium-ion batteries from the battery cells, battery modules and then to a series of security systems designed to prevent battery overcharge let warm, timely warning and protection in the event of an exception.
Network mentioned in the text: there have been media reports, "Tianjin proved eighteen lithium batteries in high temperature and pressure, puncture impact, overcharge and over discharge almost all projects have undergone combustion and explosion."
In this regard, the Secretary-General China Chemical and Physical Power Industry Association, said Liu Yanlong, the end of May 2014, China Institute of Electronics Technology Group eighteenth thematic media interviews, but the phenomenon of combustion occurs program battery explosion is recorded in accordance with the requirements of the program, the after removal of the protective circuit, it was caused by the abuse of the experiment. The main purpose of this experiment is to let the majority of users to understand the dangers of unprotected situation ternary lithium battery may occur under conditions of abuse.
"Lithium-ion battery safety is theoretically controllable, raise safety concerns mostly in and abuse of the product defect." Liu Yanlong said. "But the security simple battery cells, modules and systems, not enough to ensure the absolute safety of electric vehicles powered by lithium batteries." Ningde Times New Energy Technology Co., Ltd. (CATL) chairman Li Ping, the current top with Model -S using 7104 three yuan Panasonic lithium battery, battery safety protection spared no effort, including setting up a sensor, battery control system, extensive use of impact protection materials such as high-strength aluminum alloy and the like. In the case of taking these safety design, the probability of accidents or reached a million.
China Electronics Technology Group Corporation 18th Research Institute senior engineer Wang Qinghua also pointed out that the electric car battery products on the market varies greatly, there is a problem of poor consistency of some manufacturers of battery, and the effectiveness of management systems play a little, a monomer have some impact on the overall life of the battery pack will have a problem. In this regard, Wang Qinghua recommended that the Government increase the corresponding test certification standards, strengthen the electric car market management oversight and testing.
Waste lithium batteries pollution is not controllable?
Response: due to environmental risk is relatively small, lithium has not been included in the hazardous waste management, but as soon as possible the layout of recycling system
Lithium battery whether there are mandatory recycling policy? Whether, as stated in the article transfer network, used lithium batteries will cause huge environmental pressure? Fang said that at this stage be included in the management of hazardous wastes, including used batteries waste nickel-cadmium batteries and waste lead-acid batteries and environmental protection sectors. For disposable batteries, lithium ion batteries, nickel hydrogen batteries, etc., because of its environmental risk is relatively small, not included in hazardous waste management.
However, lithium-ion battery waste into the environment, by the electrode material, electrolyte and other substances in the environment, hydrolysis and oxidation reactions may cause nickel, cobalt, manganese and other heavy metal ion contamination, fluoride pollution as well as some organic pollution. So, these pollution controlled it?
Fang said that the process for lithium-ion batteries, the NDRC, Central Information Secretary drafting of the "electric vehicle battery recycling policy (2015 Edition)" stipulates that encourages the use of hydrometallurgical processing of waste lithium ion battery technology, the requirements of nickel, cobalt , manganese comprehensive recovery should not be less than 98%. "For lithium-ion battery processing technology, our country has been a university research team to study and carry out cooperation and exchanges with the United States." Fang said.
MIIT January 8 issued a "new energy automobile power battery waste comprehensive utilization of industry standards Announcement Interim Measures (draft)", to be used for new energy vehicles battery power utilization enterprise to implement dynamic management, commissioned by the relevant professional bodies responsible for assisting do Notice management related work.
China Electronics Technology Group Corporation chief expert, senior engineer Hu Shuqing said that for lithium iron phosphate, lithium manganese oxide and low content of cobalt ternary material as the positive electrode active material for lithium ion batteries, due to the recovery of low commercial value, not business interest high. The recycling of used batteries must be issued by the national policy, in order to successfully implement a closed loop industry. Now China promulgated a number of policies and standards, such as used batteries classification, storage and transportation standards, solid waste and hazardous waste pollution control technology policy, etc., but not sufficient.
"Lithium-ion battery recycling for reuse, as soon as possible to the layout." National 863 energy-saving and new energy vehicles project supervision team leader Wang Binggang Consulting said that the establishment battery recycling system, the need to improve the standardization of batteries and establish traceability coding system implementation strict incentives for recycling companies and qualified management.
China Battery Network