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Rich lithium-manganese-based battery: the future development of lithium mainstream direction? Jan 18, 2018

Compared to the current industry-leading high-nickel ternary batteries and all-solid-state lithium batteries, high hopes of lithium-rich manganese-based batteries have been slowing down.

From the current technology point of view, by reducing the mass ratio of batteries in the non-active mass to improve the energy density of the battery has reached almost the technical limit, the use of positive and negative materials with higher energy density is to improve the battery energy density more As a valid technical way.

We know that the first criterion for the design of the battery is to match the capacity, that is, the capacity of the positive and negative to match. At present, lithium-ion battery cathode capacity is very low, the quality of the battery is very large (1g graphite anode material to match more than 2 grams of cathode material); with silicon carbon anode, the cathode material more matching. Therefore, the industry's demand for a new generation of high-capacity cathode materials is particularly urgent.

Among the known cathode materials, the lithium-rich manganese-based cathode material discharge capacity of 250 mAh / g or more, is almost twice the actual capacity of commercial cathode materials at the same time this material is cheaper manganese Mainly low precious metal content, compared with the commonly used lithium cobalt oxide and nickel cobalt manganese ternary system cathode material, not only low cost, but also good safety. Therefore, the lithium-rich manganese-based cathode material is considered as the ideal choice for the next generation of lithium-ion batteries and is the key technology for lithium batteries to break through 400Wh / kg and even 500Wh / kg.

Although the lithium-rich manganese-based positive electrode material has the absolute advantage of specific discharge capacity, it is necessary to solve the following key technical problems in practical application of lithium-ion battery: First, to reduce the first irreversible capacity loss; second, to improve the rate performance and cycle Life; third is to suppress the voltage decay cycle. At present, there are many ways to solve this material problem: coating, acid treatment, doping, pre-circulation and heat treatment. However, these methods can only improve the performance of materials in some aspects and there is no perfect solution. Therefore, some people in the industry even predicted that it is not realistic to realize the industrialized application of lithium-rich manganese-based power battery.

As you can see, the outlook is good, but there is still a long way to go before the lithium-rich manganese-based power battery can be used.

Wanshuntong mobile battery believe that from the cathode material development direction, the lithium-rich manganese-based material has both high voltage and high capacity advantages, and the cost is lower than the ternary material, with the future maturity of lithium-rich manganese-based cathode materials, and high voltage electrolyte Such as supporting the breakthrough of key materials technology, lithium-rich manganese-based battery into the future than the mainstream of high-energy lithium battery.