Lithium manganate storage battery special for hybrid vehicles and preparation method thereof

Abstract

The invention provides a lithium manganate storage battery special for hybrid vehicles. A positive electrode material comprises a lithium manganate-containing positive active substance, a conductive agent accounting for 5-15% of the mass of the positive active substance, and an N-methylpyrrolidinone dissolved binder accounting for 5-10% of the mass of the positive active substance. A negative electrode material is composed of 85-95% of a negative active substance, 3-10% of a conductive agent and 2-10% of the N-methylpyrrolidinone dissolved binder. The positive active substance is a mixture of layered lithium manganate and more than one of lithium cobaltate, spinel type lithium manganate and lithium iron phosphate in a mass ratio of 1-2:0-1; the negative electrode material is mixture of more than one of natural graphite, artificial graphite, mesocarbon microbeads, hard carbon, lithium titanate, tin-based alloy and silicon-based alloy. The lithium manganate storage battery special for hybrid vehicles provided by the invention makes full use of the superiorities of the lithium manganate positive electrode material and polymer li-ion batteries, and has the advantages of smaller volume, lighter weight, longer life, better high temperature resistance, easier maintenance, more stable performance, and more environmental protection, etc.

Description

technical field [0001] The invention relates to the field of new high-capacity special storage battery equipment for hybrid electric vehicles, in particular to a special lithium manganate storage battery capable of supplying power to hybrid electric vehicles. Background technique [0002] Today, with the increasing shortage of oil resources and increasingly serious environmental pollution, the harmonious development of energy, resources, environment and human society has increasingly become the focus of attention, seeking to develop alternative energy sources for traditional petrochemical energy, realizing the development of harmless resource industries, and seeking the harmony between people and the environment. It is particularly urgent to realize the clean energy supply of mainstream vehicles such as automobiles. The widespread application of electric vehicles has become a reality, and the demand for high-energy density, large-capacity, and low-cost batteries is becoming ...

AI Technical Summary

Problems solved by technology

As mentioned above, lithium-ion batteries have the best application prospects among the various existing power supply series products, but the performance of lithium-ion batteries varies widely due to the different electrode material systems used.

Lithium cobalt oxide, a relatively mature positive electrode material, is only used as a positive electrode material for conventional small and medium-capacity batteries due to its poor safety. Basically, it does not have the possibility of making large-capacity and high-power power batteries.

[0005] The existing storage battery has the following disadvantages: 1. The existing storage battery has short service life, high maintenance cost, and requires frequent replacement of the storage battery

In case of permanent battery damage due to battery maintenance errors, special equipment and tools are required for maintenance; 2. The existing commonly used batteries are polluted, highly corrosive to the environment, low in capacity density, and poor in energy storage effect; 3. Some batteries are sensitive to overcharging

Overcharging will cause the gas generation of the battery to be much greater than the amount of compounding

As a result, a large amount of gas is discharged, and the battery loses water very quickly, which affects the service life of the battery; 4, the battery charge and discharge rate in the existing electric vehicle is low, and the electrical property is unstable; 5, the existing battery has a small operating environment temperature range, Poor high and low temperature resistance, small battery capacity, etc.