电池中的“液接电位”说明在化学电池中，化学能直接转变为电能是靠电池内部自发进行氧化、还原等化学反应的结果，这种反应分别在两个电极上进行。
负极活性物质由电位较负并在电解质中稳定的还原剂组成，如锌、镉、铅等活泼金属和氢或碳氢化合物等。正极活性物质由电位较正并在电解质中稳定的氧化剂组成，如二氧化锰、二氧化铅、氧化镍等金属氧化物，氧或空气，卤素及其盐类，含氧酸及其盐类等。电解质则是具有良好离子导电性的材料，如酸、碱、盐的水溶液，有机或无机非水溶液、熔融盐或固体电解质等。电池内部，当两不同组分或浓度的电解质溶液之间存在一边界，那么由于边界区城不同组分的扩散速率不等，便产生了液接电势。
存在液接电势的电池不能视为是可逆或平衡的体系;更确切地说，液接电位表明了一种稳定状态，在这种稳定状态里一个与时间无关的电荷分离状态被有效地形成。扩散往往是一个很慢的过程，相界区城的结构几乎役有什么改变。特别是当将隔膜或是多孔型绝缘物质放置于相界处，或是在相界附近的电解液中加人凝胶液，以使此处的溶液停止流动时的情况。液接电势的值除一些特例外.一般是很难求得的，如组分相同但浓度不同的两溶液间的液接电势。当两相间的浓度相差很大或阴阳离子的迁移率有显著差别时，液接电势，其值可达50mV，在实际电池体系中，液接电势可能非常低，通常可以忽略不计。
The "liquid junction potential" in a battery indicates that in achemical battery, the direct conversion of chemical energy intoelectrical energy is the result of spontaneous chemical reactionssuch as oxidation and reduction inside the battery, which occur ontwo electrodes respectively.
The negative electrode active material is composed of reducingagents with negative potential and stable in the electrolyte, suchas active metals such as zinc, cadmium, lead, and hydrogen orhydrocarbons. The positive electrode active material is composed ofoxidizing agents with positive potential and stable in theelectrolyte, such as metal oxides such as manganese dioxide, leaddioxide, nickel oxide, oxygen or air, halogens and their salts,oxygen-containing acids and their salts, etc. Electrolytes arematerials with good ionic conductivity, such as aqueous solutionsof acids, bases, and salts, organic or inorganic non-aqueoussolutions, molten salts, or solid electrolytes. Inside the battery,when there is a boundary between two electrolyte solutions ofdifferent components or concentrations, the liquid junctionpotential is generated due to the unequal diffusion rates ofdifferent components in the boundary zone.
Batteries with liquid potential cannot be considered as reversibleor balanced systems; More precisely, the liquid junction potentialindicates a stable state in which a time independent chargeseparation state is effectively formed. However, diffusion is oftena slow process, so the structure of the boundary zone city hasalmost undergone any changes. Especially when the diaphragm orporous insulating material is placed at the phase boundary, or gelsolution is added to the electrolyte near the phase boundary tostop the flow of the solution here. The value of liquid junctionpotential is generally difficult to obtain, except for some specialexceptions, such as the liquid junction potential between twosolutions with the same composition but different concentrations.When the concentration difference between two phases is significantor there is a significant difference in the migration rate ofanions and cations, the liquid connection potential reaches itsmaximum value, which can reach 50mV. However, in actual batterysystems, the liquid connection potential may be very low and canusually be ignored.
