Lithium -ion battery has these advantageous characteristics.lithium ion solar energy storage system battery

　　1) High work voltage

　　Cassents such as graphite or oil coke instead of metal lithium instead of metal lithium as the negative electrode, which will reduce the battery voltage. However, because they are low in lithium batteries, the voltage loss can be reduced to a minimum. At the same time, choose the appropriate lithium embedded compound as the battery positive electrode, and choose the appropriate electrolyte system (determine the electrochemical window of the lithium battery), which can make the lithium battery have a high working voltage (-4V), which is much higher than the water-solution system battery. Essence

　　(2) larger capacity

　　Although instead of metal lithium with charcoal material will reduce the quality of the material than the capacity, in fact, in fact, in the metal lithium secondary battery to ensure that the battery has a certain cycle life, the negative metal lithium is usually over three times excessive, so the quality in the lithium battery in the lithium battery The degree of reduction than the actual capacity is not large, and the volume ratio is almost reduced.

　　(3) High energy density

　　The higher working voltage and volume ratio determine the energy density of secondary lithium batteries. Compared with the currently widely used NI-CD batteries and NI-MH batteries, the secondary lithium battery has the highest energy density and still has great development potential.

　　(4) Good safety performance, long cycle life span

　　The reason for the unsafe battery with metal lithium anode is the multiple charging and discharge of the lithium -ion battery to change the positive structure of the lithium -ion battery to form a porous branched crystal. When the temperature is elevated, it has a severe inspiration response to the electrolyte, and the branch crystal is crystal crystal. It is safe to pierce the diaphragm and cause short circuits inside, and there is no such problem in the lithium battery, which is very safe.

　　In order to avoid the existence of metal lithium in the battery, the voltage must be controlled when charging. For insurance, there are multiple safety devices for lithium batteries. The lithium battery has no structural changes in the lithium ion insertion and dehydration on the cathode and anode during the charging and discharge process (in the process of insertion and dehydration, there will be some expansion and contraction) Stable, lithium branches crystal will not be formed during the charge and discharge process, which significantly improves the safety performance of the battery.

　　At the same time, the cycle life is also greatly improved. Lithium batteries were excluded from dangerous goods by the Dangerous Transport Office of the US Department of Transport in 1989 and 1990, respectively.

　　(5) Self -discharge rate is small

　　The lithium battery adopts a non -hydraulic fluid system, and the lithium carbon material is unstable in thermodynamics in the non -hydrocephaly system. During the first charging and discharge process, the restore of the electrolyte will form a layer of solid electrolyte (SEI) film on the surface of the carbon negative surface, allowing lithium ions to pass but not allowed electronics to pass In a relatively stable state, it has a low self -discharge rate.

　　(6) Cleaning non -pollution

　　Lithium batteries do not contain toxic substances such as lead, blessing, mercury, etc. At the same time, because the battery must be well sealed, there are very few gas release during use, and it does not cause pollution to the environment.

　　(7) High current efficiency

　　Different from the secondary battery of any water -soluble liquid system in the past, lithium batteries will not generate gas during the normal charging and discharge process, and the current efficiency is close to 100%. This nature is particularly suitable for battery packs for power storage and conversion.

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