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磷酸铁锰锂与磷酸铁锂相比有哪些优缺点? What are the advantages and disadvantages of lithium iron manganese phosphate co
时间:2022-08-11 14:27:40        点击量:【 】次


磷酸铁锰锂与磷酸铁锂相比有哪些优缺点?




磷酸铁锂是一种锂离子电池电极材料,化学式为LiFePO4(简称LFP),主要应用于各种锂离子电池。磷酸铁锂具有有序规则的橄榄石型结构,其中锂离子具有一维迁移率。充电和放电过程中可逆的提取和插入。




磷酸铁锂起步较早,技术相对成熟。其核心优势是价格低廉、环保、安全性能高、结构稳定性和循环性能更好。缺点是低温性能差,能量密度低。




磷酸铁锰锂属于磷酸铁锂和磷酸锰锂的混合产品,结构与磷酸铁锂相同,均为有序且规则的橄榄石结构。磷酸铁锰锂和磷酸铁锂具有成本低、安全性能高、热稳定性高、针刺和过充不自燃、寿命长、安全、无爆炸危险等优点。可以说它兼有磷酸铁锂和磷酸铁锂。磷酸锰锂的优点也可以弥补磷酸铁锂能量密度低的缺点,因此也被称为“磷酸铁锂的升级版”。




磷酸铁锂与磷酸铁锰锂参数对比




1、电池能量密度更高,续航时间更长。




磷酸铁锰锂的理论容量与磷酸铁锂相同,均为170mAh/g;但磷酸铁锰锂相对于Li/Li的电极电位为4.1V,远高于磷酸铁锂的3.4V,且位于有机电解质体系中。与磷酸铁锂相比,稳定电化学窗口提高0.7V,平台电压提高20%,从而推动磷酸铁锰锂在相同体积和质量下的能量密度从578Wh/kg提高到697Wh/kg .




2.降低制造成本。




磷酸铁锰锂与磷酸铁锂材料用量的主要区别在于所需锰源用量的变化。每千瓦时磷酸铁锂正极需要0.61kg铁源,而每千瓦时磷酸铁锰锂正极需要铁源0.13kg+锰源0.38kg。




磷酸铁锰锂的缺陷




与磷酸铁锰锂和磷酸铁锂相比,磷酸铁锰锂存在以下缺陷:




1、磷酸铁锰锂循环寿命短,充放电能力差。在磷酸铁锰锂中添加锰,锰的溶解会导致循环寿命变短,充放电容量和寿命变差。




2、磷酸铁锰锂电导率低,使其容量难以发挥,与电解液的副反应使其材料容量难以发挥。




磷酸铁锰锂正极材料电池作为一种实用的新型锂电池,代表了电池未来的发展方向。是有史以来最理想的动力电池。未来,它甚至会成为最便宜的动力电池,成为电池行业未来发展的核心产品之一。与其他动力电池相比,具有不可比拟的优势。


What are the advantages and disadvantages of lithium iron manganese phosphate compared with lithium iron phosphate?


Lithium iron phosphate is a lithium-ion battery electrode material with the chemical formula LiFePO4 (LFP for short), which is mainly used in various lithium-ion batteries. Lithium iron phosphate has an ordered and regular olivine-type structure, in which lithium ions have one-dimensional mobility. Reversible extraction and insertion during charge and discharge.


Lithium iron phosphate started early, and its technology is relatively mature. Its core advantages are low price, environmental friendliness, high safety performance, better structural stability and cycle performance. The disadvantage is poor low temperature performance and low energy density.


Lithium iron manganese phosphate belongs to the mixed product of lithium iron phosphate and lithium manganese phosphate, and has the same structure as lithium iron phosphate, both of which are ordered and regular olivine structure. Lithium iron manganese phosphate and lithium iron phosphate have the same advantages of low cost, high safety performance, high thermal stability, no spontaneous combustion during acupuncture and overcharge, long life, safety and no risk of explosion. It can be said that it has both lithium iron phosphate and lithium iron phosphate. The advantages of lithium manganese phosphate can also make up for the shortcomings of low energy density of lithium iron phosphate, so it is also known as an "upgraded version of lithium iron phosphate".


Comparison of parameters between lithium iron phosphate and lithium iron manganese phosphate


1. The battery has higher energy density and longer battery life.


The theoretical capacity of lithium iron manganese phosphate is the same as that of lithium iron phosphate, which is 170mAh/g; but the electrode potential of lithium iron manganese phosphate relative to Li/Li is 4.1V, which is much higher than 3.4V of lithium iron phosphate, and it is located in the organic electrolyte system. Compared with lithium iron phosphate, the stable electrochemical window is increased by 0.7V, and the platform voltage is increased by 20%, thus promoting the energy density of lithium iron manganese phosphate from 578Wh/kg to 697Wh/kg under the same volume and mass.


2. Lower manufacturing cost.


The main difference between the amount of lithium iron manganese phosphate and lithium iron phosphate materials is the change in the amount of manganese source required. The lithium iron phosphate cathode per kWh requires 0.61kg iron source, while the lithium iron manganese phosphate cathode per kWh requires iron source 0.13kg + manganese Source 0.38kg.


Defects of Lithium Iron Manganese Phosphate


Compared with lithium iron manganese phosphate and lithium iron phosphate, lithium iron manganese phosphate has the following defects:


1. Lithium iron manganese phosphate has a short cycle life and poor charge and discharge capacity. Manganese is added to lithium iron manganese phosphate, and the dissolution of manganese will lead to shorter cycle life, poor charge-discharge capacity and life.


2. The low conductivity of lithium iron manganese phosphate makes it difficult to exert its capacity, and the side reaction with the electrolyte makes it difficult to exert the capacity of its material.


As a practical new type of lithium battery, lithium iron manganese phosphate cathode material battery represents the future development direction of the battery. It is the most ideal power battery ever invented. In the future, it will even become the cheapest power battery and one of the core products for the future development of the battery industry. Compared with other power batteries, it has incomparable advantages.


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