*nhung hieu biet ve pin kho MnO2-Zn:

-duoc phat minh va su dung  nhugn nam dau the ki 20,cho den  nay van dc su dung rong rai dac biet la o cac nuoc dang phat trien

-uu diem:+don gian su dung thuan tien,di chuyen de dang ,rung lac ,xoc ko anh huong

               + re tien

-nhuoc diem:su tu phong lon,cac phan ung luon luon xay ra

*cau tao  va tac dugn cua tung chi tiet

1) vo kem(dong vai tro la cuc am)

2)giay tam ho(dong vai tro la lop  ngan cach giua chat hoat dong cuc(-)va cuc (+) ben trong dc tam chatdien ly dong vai tro lamoi truong chat dien ly trong pin

3)chat hoat dogn cuc duong nhu MnO2,bot C,NH4Cl tinh the,than hoat tinh

4)coc than chi:dan dien cho cuc duong

5)lop giay lot day: ngan cach dien giua chat hoat dong cuc duong va ben ngoai

6,7)lop lot giay co dinh chat hoat dongcuc duong tao ra khoang trong(8) trong pin:can bang ap suat trong pin

9)lop xi bang khau:bit kin pin,tranh su tiep xuc ko khi voi cac chat hoat dong ben trong

10)nap nhua:cho phia trong

11)lop giay lot phia tren lop xe

12)mu dong:bao ve dien cuc than va dan dien (tiep dien)

*qua trinh phan ung dien cuc:  (-)Zn/NH4Cl/MnO2

- dien cuc duong:MnO2,graphit,muoi C2h2 thanh phan chinh la MnO2,day la chat tham gia phan ung khi pin hoat dong.su hoat dong cuaMnO2 co nhieu co che de giai thich

1: MnO2+H2O+e------>Mn2O3+OH-

2:cung la qua trinh chuyrn tu MnO2----->Mn2O3 nhugn qua cac giai doan trung gian khac nhau

3:MnO2+H++e---->MnOOH

theo co che(3) khi pin hoat dong,do ph tang len,dien the dien cuc (+) giam di do do muon tang dien the,giam do kiem thi thi qtrinh p/u cua NH4+voi OH- dien ra,NH3 sinh ra lam giam do kiem cua moi truong chat dien ly NH3 khuech tan ra ngoai ,1 phan hap phu tang len boi than hoat tinh,1 phan tuong tac voi dien cuc Zn tao ra  cac san pham kho tan bam len be mat dien cuc am ,do do khi pin su dung trong thoi gian dai thi dien tro trong tang len dien the cua no giam xuong

- dien cuc am:Zn-2e---->Zn2+

---------> phan ung:      2Zn+4MnO2+4NH4Cl  <=> ZnCl2+MnOOH+(Zn(NH3)4)Cl2