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Stable lithium ion battery with high capacitance

A lithium-ion battery, capacitance stabilization technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor electrode cycle stability, poor thermal stability, low capacity, etc., to improve charge and discharge capacity, increase large Effects of rate performance and power density improvement

Inactive Publication Date: 2014-02-26
JIANGSU TENPOWER LITHIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, studies have found that after overcharging, the cycle stability of the electrode becomes poor, the capacity decays extremely fast, and the safety of the battery also deteriorates. Lithium nickelate has a high charging specific capacity, but poor thermal stability, and lithium manganate has good thermal stability, but the capacity It is also low, and the advantages of the three are the same as lithium nickel manganese cobalt, which has become a research hotspot

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] For the negative electrode, 100 grams of artificial graphite with surface nanometerization, 100 grams of resin, and 300 g of NaOH template agent with particle size distribution of 1 to 2 nm, medium particle 5 to 50 nm, and large particle 70 to 120 nm are added to methanol for mechanical ball milling for 60 minutes, and then, Evaporate to dryness at a low temperature of 50-60°C to obtain a precursor. Under the protection of ammonia gas, first heat the prepared precursor to 200°C at a heating rate of 5-10°C / min, keep the temperature for 180 minutes, and then press 1-5 ℃ / min to 700 ℃, keep the temperature for 300min and then cool down with the furnace to obtain a three-dimensional layered pore shell material with micropores wrapped in the core material; through the nitrogen adsorption and desorption isotherm method, the pore size distribution of the micropores is: large The pore diameter is 50-120nm, the mesopore diameter is 3-50nm, and the small pore diameter is less than ...

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PUM

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Abstract

The invention discloses a stable lithium ion battery with high capacitance. Two poles are respectively prepared from a composite carbon cathode material and a ternary composite anode material. By adopting the stable lithium ion battery, the high magnification performance and the power density of the lithium ion battery can be effectively improved. The stable lithium ion battery has high-magnification charge and discharge properties. Three transition metals such as nickel, manganese and cobalt are evenly mixed, so that a layered structure of the material is stabilized by synergistic effects of the nickel, manganese and cobalt, and the charge and discharge capacities, the cycle performance and the overcharging tolerance of the material are improved.

Description

technical field [0001] The invention relates to batteries, in particular to a high-capacity stable lithium-ion battery. Background technique [0002] Due to its excellent performance and stable quality, lithium-ion batteries have been widely used in energy storage, electric tools and other industries. Although lithium-ion batteries have the characteristics of high energy density and small self-discharge, their rate performance is not ideal, and their power Low density; lithium cobalt oxide for lithium-ion batteries has become the preferred material for the positive electrode of lithium-ion batteries currently used in stores due to its simple manufacturing process, material stability and good cycle performance. However, the effective utilization rate of lithium cobalt oxide is only about 60%, and the deintercalation amount of lithium cobalt oxide is positively related to its charging voltage. to 170-180mAh / g. However, studies have found that after overcharging, the cycle st...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCY02E60/122H01M4/366H01M4/505H01M4/525H01M4/587H01M10/0525Y02E60/10
Inventor 陈璇秦丽沈春平钱国珠黄满湘苏乐乐
Owner JIANGSU TENPOWER LITHIUM
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