Nonaqueous electrolyte for secondary lithium ion battery

A secondary lithium battery and electrolyte technology, applied to secondary batteries, circuits, electrical components, etc., can solve problems such as affecting battery capacity, poor low-temperature performance, and poor low-temperature cycle performance

Inactive Publication Date: 2012-01-25
DONGGUAN AMPEREX TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, adding nitrile (NC-R-CN) additives alone in the electrolyte additives can improve the high-temperature storage performance of the battery, but it will affect the capacity of the battery; if adding vinylene carbonate (VC) additives alone in the electrolyte additives , improve the high-temperature cycle performance of the battery, but the low-temperature cycle performance is poor; for example, adding a fluoroethylene carbonate (FEC) additive to the electrolyte additive alone can prolong the cycle life of the battery, but the battery will be flattened when stored at high temperature; Adding 1,3-propane sultone (PS) additive alone in the electrolyte additive can improve the high-temperature cycle performance of the battery, but the low-temperature per

Method used

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  • Nonaqueous electrolyte for secondary lithium ion battery
  • Nonaqueous electrolyte for secondary lithium ion battery
  • Nonaqueous electrolyte for secondary lithium ion battery

Examples

Experimental program
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preparation example Construction

[0036] Using the same preparation as above, using a mixed solvent system of EMC, MPC (methyl propyl carbonate) and EC, the volume ratio is about 1:4:5, and 1% VC and 3% PS are added to the above organic solvent system , This electrolyte is B1. Use a mixed solvent system of DEC, EC, and PC with a volume ratio of about 4:3:3. Add 1% of VC and 3% of PS to this organic solvent system. The electrolyte is B2.

[0037] Table 2 Details of each comparative example

[0038] EC

[0039] 4. Preparation of lithium ion battery

Embodiment 1

[0041] The negative pole piece made of high graphitized high energy density graphite, the high graphitized high energy density graphite is artificial graphite, and the positive pole piece made of lithium cobalt oxide is made into a bare cell by winding. The core and outer packaging are made of aluminum-plastic composite film, which is poured into electrolyte A1 and formed into a flexible lithium-ion battery C1 with a capacity of 1450mAh. The shape of the battery can be made into any shape according to customer requirements.

Embodiment 2

[0043] Referring to Example 1, a bare cell was produced, except that when the electrolyte was poured, the A2 electrolyte was used to produce the lithium ion battery C2.

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PUM

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a nonaqueous electrolyte for a secondary lithium ion battery, which is prepared by adopting an organic solvent containing at least one cyclic carbonate and one linear carbonate, wherein the cyclic carbonate comprises ethylene carbonate (EC) and propylene carbonate (PC), the linear carbonate comprises ethyl methyl carbonate (EMC), diethyl carbonate (DEC) or a solvent system formed by any of the EMC and the DEC, and lithium hexaflourophosphate is used as the electrolyte. The nonaqueous electrolyte is characterized in that nitriles (NC-R-CN) are simultaneously added, wherein R is alkyl, C is 2-6, vinylene carbonate (VC), fluoroethylene carbonate (FEC) and 1,3-propane sultone (PS) are used as additives, and the weight percents of all additives are regulated. A battery adopting the nonaqueous electrolyte has excellent high-temperature property and circulating property.

Description

Technical field [0001] The present invention relates to the technical field of lithium ion batteries, in particular to an electrolyte for non-aqueous secondary lithium batteries. Background technique [0002] With the popularization of electronic products in people's daily life, lithium-ion batteries have been widely used in civil power sources due to their environmental protection, high energy density, light weight, and safety advantages. At the same time, users have put forward higher and higher requirements for battery energy density, usage time, and ambient temperature. [0003] At present, the electrolyte for non-aqueous lithium secondary batteries usually uses organic solvents containing cyclic carbonate and a linear carbonate. Cyclic carbonates include ethylene carbonate (EC), propylene carbonate (PC), and linear carbonate. The ester includes a solvent system composed of ethyl methyl carbonate (EMC), diethyl carbonate (DEC) or any of them, with lithium hexafluorophosphate a...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0569
CPCY02E60/12Y02E60/10
Inventor 冼海燕何丽萍许瑞
Owner DONGGUAN AMPEREX TECH
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