Usually?the lithium polymer battery?(Li-ion)?of the electrical core?cathode?using LiCoO2,?LiNiO2,?LiMn2O2,?where LiCoO2?is a?layer?structure is very?stable polymorph,?but when?taking?XLi from?LiCoO2,?and its structure?may change,but?not?change depending on the?size of the X.

Through the study found that the?structure?performance?when X>0.5?Li1-XCoO2 is?extremely unstable,?will?crystal?collapsed,?its external?manifestation ofoverwhelming?end for?electric core.?So the?electric core?should be controlled?in Li1-XCoO2?X?by limiting the?charging voltage?in the use process,?the generalcharging voltage?is not more than 4.2V,?then X?is less than 0.5,?then the?crystal type?of Li1-XCoO2 remains?stable.

Overcharge?and?over discharge,?the positive and the negative?pole?of?lithium ion battery?causing?permanent damage,?from the molecular?level,?can intuitively?understand.?Excessive?discharge?will lead to?excessive?release ofcarbon anode?of lithium ion?and the?lamellar structure?collapse,?the?lithium iontoo many hard?into the?carbon anode?structure?to?over charge,?and makessome?lithium ion?cannot?release.?The control circuit?is one of the reasons?whyare usually equipped with?a lithium ion battery?charging and discharging.

The negative?C6?itself?has its own characteristics,?when the first?polarized into,positive?LiCoO2?Li?was in charge of?the negative?C6,?when the discharge?when Li returned to?positive?in LiCoO2,?but?after the?formation?must be part of a?Li at the?cathode?in C6,?in order to ensure the normal?embedded in?the nextcharging and discharging?Li,?otherwise the?electric core?over?very short,?in order to ensure?there is a part of?Li at the?anode?C6,?generally?by limiting thedischarge lower limit voltage?to achieve.?So the?lithium core?security?chargeupper limit voltage?≤ 4.2V,?discharge lower limit?voltage greater than 2.5V.

Of course,?if it is?forced discharge,?in?0V,?the problem is?Li is a?high activeelements,?overcharge and?over discharge?will bring?risk.?Finished?the flashlight battery?now?normally used?only?in?3V,?it is because the?lithium batteryprotection board,?a protective plate?set?discharge?voltage?is about 3V,?and then put?will protect,?forced?off the?discharge.?Is?set to?3V because?the battery to the?3V?is?basically?the?amount of discharge of?all,?continue to use?will make the?voltage?decline very rapidly.?Now?manufacturers of?industrial?lithium?is generally recommended?minimum discharge?voltage of less than?2.25V.?Belowthis value will?cause?permanent damage?of lithium battery,?the battery?swelleffect.