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Lithium ion secondary cell

A secondary battery, lithium-ion technology, applied in secondary batteries, batteries, battery electrodes, etc., can solve the problems of poor battery technology, fast capacity decay, and short cruising range.

Active Publication Date: 2016-02-03
微宏先进材料公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, many problems are exposed in the operation of electric vehicles, such as short mileage, fast capacity decay, long charging time, high battery temperature, low temperature and unable to start, etc. The main reason is that the battery technology is not qualified.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] The active material contained in the positive electrode described in the present invention includes LiNi 0.5 co 0.2 mn 0.3 o 2 (NCM523), where LiNi 0.5 co 0.2 mn 0.3 o2 After modification, it contains Mn, Na, K, Rb, Cs, Mg, Ca, Sr, Ba, Al, Ga, In, Ge, Sn, Ti, V, Cr, Fe, Cu, Zn, Y, Zr , Nb, Mo, Cd, W, La, Ce, Nd, Sb and Sm at least one element or its surface contains PO 4 3- ion. NCM523-Ti is the active material of the positive electrode material, and the surface of NCM523 is coated with oxide TiO 2 , the average particle size of the active material of the positive electrode material is measured by a laser particle size analyzer (D50) to be 6.8 μm, and the coating amount of the modified element compound on the active material of the positive electrode material is calculated as an oxide, accounting for about 10% of the total mass of the positive electrode material. 1.0 wt%. The preparation method is as follows: Dilute the stoichiometric titanium isopropoxide wit...

Embodiment 2

[0072] The positive active material is the same as in Example 1, and the battery manufacturing process is the same as in Example 1; the difference is that the negative active material is a mixture of soft carbon and artificial graphite, and the mass ratio of the two is 50:50. The composition of the electrolyte is shown in Table 5, the main solvents include EC, EMC, DMC, DEC, LiPF 6 The concentration is 0.10mol / L, the addition amount of VC is 0.5wt%, the addition amount of 1,3-PS is 2.5wt%, the addition amount of LiFSI is 5.0×10 -6 mol / mAh. Due to the difference in the ratio of components in the active material, the battery size is slightly different.

[0073] Battery life test: At an ambient temperature of 60°C, charge and discharge the above-mentioned soft-packaged battery within the voltage range of 2.75V to 4.10V, with a constant current charge rate of 3C and a constant current discharge rate of 6C, and investigate its high rate charge and discharge cycle under high temper...

Embodiment 3

[0075] NCM523-Zn is the active material of the positive electrode material. The surface of NCM523 is coated with oxide ZnO. The average particle size of the active material of the positive electrode material is 6.8 μm (D50) measured by a laser particle size analyzer. The modified element compound is used in the active material of the positive electrode material. The amount of coating on the oxide is calculated as 2.0wt% of the total mass of the positive electrode material. The preparation method is as follows: prepare stoichiometric nano-scale ZnO (D50<80nm), surfactant and water into a suspension solution, then add the active material of the positive electrode material, mix at a high speed for 15 minutes at room temperature, and then distill off the water. The mixture was heat-treated at 500° C. for 2 h in a high-temperature furnace to obtain NCM523-Zn cathode material. When designing the battery, the specific capacity of the NCM523-Zn positive electrode material is calculate...

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Abstract

The invention provides a lithium ion secondary cell, in particular a long-life fast-charging cell. The long-life fast-charging cell comprises a positive electrode material, a negative electrode material, a diaphragm and a nonaqueous electrolyte, wherein the active substance of the negative electrode material comprises at least one of hard carbon and soft carbon; the nonaqueous electrolyte contains a film-forming additive and a lithium salt; the film-forming additive comprises vinylene carbonate; and the lithium salt comprises lithium difluorosulfonylimide. Due to excellent performance, the long-life fast-charging cell has broad market prospects.

Description

technical field [0001] The invention relates to a lithium ion secondary battery, in particular to a long-life fast charging battery. Background technique [0002] The Chinese government has elevated new energy vehicles to a strategic new industry, and has successively promoted the accumulation of capital and technology in the industrialization of new energy vehicles and product research and development through various channels such as support for scientific and technological projects, industrialization application demonstrations, and car purchase subsidies, and has achieved gratifying results. progress. There are many branches of new energy vehicles. Combining China's national conditions and the development experience of major countries in the world, electric vehicles are the leading direction for the transformation of China's auto industry. Among them, lithium-ion battery technology is the core of electric vehicles. In developed countries that attach importance to the deve...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/583H01M4/62H01M10/0567H01M10/0568
CPCH01M4/583H01M4/625H01M10/0525H01M10/0567H01M10/0568H01M2220/20Y02E60/10
Inventor 郑卓群聂云华张玉梅李林峰徐杰
Owner 微宏先进材料公司
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