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Non-aqueous electrolyte and lithium battery using same

A non-aqueous electrolyte and lithium battery technology, which is applied in the field of lithium batteries and non-aqueous electrolytes, can solve the problems of poor wide temperature performance and large impedance, and achieve the effect of reducing impedance, low charge transfer impedance, and promoting transfer

Active Publication Date: 2022-01-28
SHANGHAI YUYUAN POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is necessary to solve the problems of high impedance and poor wide temperature performance of current lithium-ion batteries.

Method used

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  • Non-aqueous electrolyte and lithium battery using same
  • Non-aqueous electrolyte and lithium battery using same
  • Non-aqueous electrolyte and lithium battery using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-16

[0037] A lithium battery, the positive electrode is LiFePO 4 , the negative electrode is artificial graphite, the diaphragm is a microporous polyethylene film, and the electrolyte used is ethylene carbonate (EC): ethyl methyl carbonate (EMC): dimethyl carbonate (DMC) = 1:1:1 (volume ratio ) dissolved LiPF in the mixed solvent 6 Make a 1mol / L solution, and add the corresponding mass concentration of the complex and the corresponding mass concentration of LiPO 2 f 2 , the complex structure formula is as follows:

[0038]

[0039] According to the above method, the prepared electrolyte solution and associated positive and negative electrodes, separators, etc. were made into non-aqueous cylindrical 18650 batteries in the following Table 1 and Table 2 examples.

[0040] Table 1

[0041] Complex LiPO 2 f 2

LiODFB Example 1 0.5 0.25 1 Example 2 0.5 0.5 1 Example 3 0.5 1 1 Example 4 0.5 2 1 Example 5 1.0 0.25 1 E...

Embodiment 17

[0058] A kind of lithium battery, positive pole LiNi x co y mn z L (1-x-y-z) o 2 , where L is one of Co, Al, Sr, Mg, Ti, Ca, Zr, Zn, Si, Fe, specifically: LiNi 0.33 co 0.33 mn 0.33 0 2 , LiNi 0.4 co 0.2 mn 0.4 0 2 , LiNi 0.4 co 0.3 mn 0.3 0 2 , LiNi 0.5 co 0.2 mn 0.3 0 2 , LiNi 0.6 co 0.2 mn 0.2 0 2 , LiNi 0.8 co 0.1 mn 0.1 0 2 , LiNi 0.9 co 0.05 mn 0.05 0 2 , LiNi 0.33 co 0.33 mn 0.27 Al 0.06 0 2 , LiNi 0.6 co 0.17 mn 0.2 Mg 0.03 0 2 , LiNi 0.305 co 0.33 mn 0.33 Ti 0.025 0 2 , LiNi 0.33 co 0.305 mn 0.33 Ti 0.025 0 2 , LiNi 0.33 co 0.33 mn 0.305 Ti 0.025 0 2 , LiNi 0.784 co 0.1 mn 0.1 Ca 0.016 0 2 , LiNi 0.768 co 0.1 mn 0.1 Ca 0.032 0 2 , LiNi 0.736 co 0.1 mn 0.1 Ca 0.064 0 2 , LiNi 0.5 co 0.2 mn 0.29 Zr 0.01 0 2 , LiNi 0.33 3 co 0.292 mn 0.333 Zn 0.041 0 2 , LiNi 0.333 co 0.25 mn 0.333 Zn 0.083 0 2 , LiNi 0.333 co 0.166 mn 0.333 Zn 0.167 0 2 , LiNi 0.333 co 0.3 mn 0.333 Fe 0.033 0 2...

Embodiment 18

[0064] A lithium battery, the positive electrode is LiCo x2 L (1-x2) o 2 , wherein L is one of Co, Al, Sr, Mg, Ti, Ca, Zr, Zn, Si, Fe, 06 Make a 1mol / L solution, and add the corresponding mass concentration of the complex and the corresponding mass concentration of LiPO 2 f 2 With bisoxalate borate (LiBOB), the complex structure formula is as follows:

[0065]

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Abstract

The invention discloses a non-aqueous electrolyte and a lithium battery using the same, and belongs to the technical field of batteries. The non-aqueous electrolyte includes: a non-aqueous solvent; lithium salt with a mass percent of 5-20%; and a complex which is composed of sulfonate, organic matter of nitrogen and oxide of sulfur, wherein the mass percent of the complex is 0.1-5%. The complex disclosed by the invention contains sulfonic acid groups and sulfur-containing compounds, is an important organic film-forming additive, can form a solid electrolyte phase interfacial film on the surface of a battery electrode after being added into the electrolyte, inhibits co-intercalation and reductive decomposition of solvent molecules in a negative electrode, and improves the cycle performance and high-temperature performance of a lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a non-aqueous electrolytic solution and a lithium battery using the same. Background technique [0002] The operating temperature range is one of the important performance indicators of the power system. Energy systems and power systems equipped with military equipment should have a wide operating temperature range, and the operating temperature range is not narrower than minus 40-55°C. However, it is currently difficult for lithium-ion batteries to work with high performance in such a wide temperature range. [0003] The wide temperature performance of lithium-ion batteries has a clear relationship with the positive electrode, electrolyte solution and negative electrode. The positive electrode material is usually the decisive factor in determining the working voltage and specific capacity of a lithium-ion battery; the combination of the negative electrode material and the pos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0525H01M10/4235H01M2300/0025Y02E60/10
Inventor 尚德华刘帅
Owner SHANGHAI YUYUAN POWER TECH CO LTD
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