Lithium ion battery electrolytic solution capable of discharging at low temperature

A lithium ion battery and electrolyte technology, applied in the field of lithium ion batteries, can solve the problems of difficult film formation, poor thermal stability, difficult synthesis, etc., and achieve the effects of good cycle performance, improved charge and discharge capacity, and enhanced safety performance.

Inactive Publication Date: 2017-02-22
ZHANGZHOU WANBAO ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commercially available electrolyte, the solvent is mostly a mixture of carbonates, and the electrolyte lithium salt is mainly LiPF 6 , but as a lithium-ion battery electrolyte, it is easy to absorb moisture and hydrolyze to produce toxic gases, has poor thermal stability, and will decompose into LiF and PF at high temperatures 5 , difficult to synthesize
Also based on LiPF 6 The low-temperature conductivity of the electrolyte is low, and it is difficult to form a film on the negative electrode of a lithium-ion battery assembled with an electrolyte that does not contain ethylene carbonate (EC) solvent.

Method used

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  • Lithium ion battery electrolytic solution capable of discharging at low temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A lithium-ion battery electrolyte that can be discharged at low temperature is prepared from the following raw materials in parts by weight: 33.1 parts of electrolyte, 52 parts of organic solvent, 17 parts of organic additive and 0.23 part of inorganic additive.

[0022] Described electrolyte is by weight: Li[B(C 6 h 4 o 2 ) 2 ]:Li[B(C 10 h 6 o 2 ) 2 ]:Li[B(OC 6 h 4 CH 2 O) 2 ]:Li[B(C 2 o 4 ) 2 ]:LiBOB=5:5:3:2:2;

[0023] Described organic solvent is by weight: dimethyl carbonate DMC: ethyl methyl carbonate EMC=33:19;

[0024] The weight ratio of the organic additives is: vinylene carbonate VC: fluoroethylene carbonate FEC=0.49:17.47;

[0025] The inorganic additive is K 2 SO 3 or K 2 ClO 4 .

Embodiment 2

[0027] A low-temperature discharge lithium-ion battery electrolyte is prepared from the following raw materials in parts by weight: 33.1 parts of electrolyte, 52 parts of organic solvent, 18 parts of organic additives and 0.34 parts of inorganic additives.

[0028] Described electrolyte is by weight: Li[B(C 6 h 4 o 2 ) 2 ]:Li[B(C 10 h 6 o 2 ) 2 ]:Li[B(OC 6 h 4 CH 2 O) 2 ]:Li[B(C 2 o 4 ) 2 ]:LiBOB=5:5:3:2:2;

[0029] Described organic solvent is by weight: dimethyl carbonate DMC: ethyl methyl carbonate EMC=33:19;

[0030] The weight ratio of the organic additives is: vinylene carbonate VC: fluoroethylene carbonate FEC=0.49:17.47;

[0031] The inorganic additive is K 2 SO 3 or K 2 ClO 4 .

Embodiment 3

[0033] A lithium-ion battery electrolyte capable of low-temperature discharge is prepared from the following raw materials in parts by weight: 33.1 parts of electrolyte, 52 parts of organic solvent, 19 parts of organic additive and 0.34 part of inorganic additive.

[0034] Described electrolyte is by weight: Li[B(C 6 h 4 o 2 ) 2 ]:Li[B(C 10 h 6 o 2 ) 2 ]:Li[B(OC 6 h 4 CH 2 O) 2 ]:Li[B(C 2 o4 ) 2 ]:LiBOB=5:5:3:2:2;

[0035] Described organic solvent is by weight: dimethyl carbonate DMC: ethyl methyl carbonate EMC=33:19;

[0036] The weight ratio of the organic additives is: vinylene carbonate VC: fluoroethylene carbonate FEC=0.49:17.47;

[0037] The inorganic additive is K 2 SO 3 or K 2 ClO 4 .

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Abstract

The invention relates to the technical field of a lithium ion battery, particularly to a lithium ion battery electrolytic solution capable of discharging at a low temperature. The lithium ion battery electrolytic solution is prepared from the following raw materials in parts by weight: 33.1 parts of electrolyte, 52 parts of organic solvent, 17-19 parts of organic additive and 0.23-0.34 parts of inorganic additive, wherein the inorganic additive is K<2>SO<3> or K<2>ClO<4>. By adoption of the electrolytic solution taking K<2>SO<3> or K<2>ClO<4> as the inorganic additive, a stable and dense solid electrolyte interface (SEI) film can be formed on an electrode, and high cycling performance is represented.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a low-temperature dischargeable lithium-ion battery electrolyte. Background technique [0002] Lithium-ion batteries are green, high-energy and environmentally friendly batteries that appeared in the 1990s. Due to their advantages such as high voltage, small size, light weight, high specific energy, no memory effect, no pollution, small self-discharge, and long life, they are widely used in mobile phones. , notebook computers, camcorders, digital cameras and other portable electronic products that emphasize thinness, shortness, and multi-function are rapidly popularized. [0003] Electrolyte is one of the important components of lithium-ion batteries. It plays the role of transporting ions between the positive and negative electrodes of the battery, and has an important impact on the capacity, cycle performance and safety performance of the battery. At present, the...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H01M10/056H01M10/42
CPCH01M10/056H01M10/4235H01M2300/0017H01M2300/0091Y02E60/10
Inventor周开礼吴劲贤吴建平吴荣鑫王雁斌吴敏杰
OwnerZHANGZHOU WANBAO ENERGY TECH CO LTD