A new type of battery capacitor based on composite positive and negative electrode materials

Abstract

The present invention relates to the field of novel energy resource storage devices, and particularly to a novel battery capacitor based on a composite anode and cathode material. The battery capacitor comprises an anode, a cathode, a conductive agent, a bonding agent, an electrolyte, a separator membrane and an etched aluminum foil sheet; and the anode of the battery capacitor is made of a composite material comprising lithium manganite and activated carbon, and the cathode of the battery capacitor is made of a composite material comprising lithium titanate and activated carbon. The present invention employs lithium manganite and lithium titanate composite electrodes, thus greatly improving the conductivity of an electrode material and an energy storage performance of a part of the capacitor by introducing activated carbon, significantly improving the rate performance of a product, and satisfying requirements for large current charging and discharging; through the doping and coating of lithium manganite and lithium titanate, the problems of gas production and dissolution are solved, and a cycle lifespan is improved; in addition, through the use of the composite conductive agent, a better conductive network can be constructed, and a power density can be further enhanced.

Description

technical field [0001] The invention relates to the field of new energy storage devices, in particular to a novel battery capacitor based on composite positive and negative electrode materials. Background technique [0002] Lithium titanate (Li 4 Ti 5 o 12 ) has a lithium-rich spinel structure. Compared with the graphite negative electrode, the theoretical capacity is lower (170mAh / g), and the voltage is higher (1.5V vs Li), both of which undoubtedly reduce the specific energy of lithium titanate, but a series of other advantages make it It becomes an attractive candidate anode material. First of all, the deformation amount is very small during the cycle, which makes Li 4 Ti 5 o 12 It has good cycle stability; in addition, there is no electrolyte decomposition and no SEI film formation; it has excellent rate performance, low-temperature charge-discharge performance, and thermal stability. [0003] Compared with the existing graphite / lithium cobalt oxide system in the...

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Problems solved by technology

[0004] However, the electronic conductivity of lithium titanate and lithium manganate is relatively low. In addition, there are defects such as flatulence and manganese dissolution in the electrolyte solution during multiple charge and discharge cycles, which greatly restricts the power performance and cycle of this system. It is difficult to meet the needs of fast charge and discharge and long-term use in green new energy fields such as electric passenger vehicles

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