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Electrolyte solution for silicon based lithium secondary battery and silicon based lithium secondary battery

A secondary battery and electrolyte technology, applied in the electrolyte field, can solve the problem that the low-temperature discharge performance needs to be further improved, and achieve the effects of good low-temperature performance, suppressing the generation of HF, and low impedance

Inactive Publication Date: 2017-10-20
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] It can be seen from the records in Table 1 of CN201610882936.0 that it has relatively excellent normal temperature cycle performance and high temperature storage performance, but its low temperature discharge performance needs to be further improved

Method used

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  • Electrolyte solution for silicon based lithium secondary battery and silicon based lithium secondary battery
  • Electrolyte solution for silicon based lithium secondary battery and silicon based lithium secondary battery
  • Electrolyte solution for silicon based lithium secondary battery and silicon based lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In the preparation method of the lithium secondary battery in this embodiment, the coating surface density is determined according to the battery size, capacity design value and capacity of positive and negative electrode materials. The positive electrode active material is nickel cobalt lithium manganate (NCM523) material; the negative electrode active material is silicon carbon negative electrode (SiO content in the silicon carbon negative electrode material accounts for 10wt%).

[0043] The positive electrode preparation steps, negative electrode preparation steps, electrolyte preparation steps, diaphragm preparation steps and battery assembly steps are described as follows:

[0044]The positive electrode preparation step is: mix the positive electrode active material NCM523, conductive carbon black and binder polyvinylidene fluoride at a mass ratio of 96.8:2.0:1.2, and disperse them in N-methyl-2-pyrrolidone to obtain the positive electrode slurry Material, the posi...

Embodiment 2～ Embodiment 25

[0058] In Example 2 to Example 25, except that the composition and content of additives in the electrolyte (based on the total mass of the electrolyte) were added as shown in Table 1, the preparation of the rest of the positive electrode, negative electrode, separator, and lithium secondary battery was the same as in Example 1.

[0059] In the embodiment of table 1, structural formula I specific material description

[0060]

[0061]

[0062] See Table 1 for specific substance descriptions of structural formula I in each implementation. In addition, FEC in Table 2 and Table 3 is fluoroethylene carbonate, LiDFOB is lithium difluorooxalate borate, and 1,3‐PS is 1,3‐propanesulfonate Lactone, PRS is propenyl‐1,3‐sultone, DTD is vinyl sulfate, VC is vinylene carbonate.

[0063] Electrolyte additive composition and battery (NCM523 / silicon carbon) performance test result in table 2 each embodiment and comparative example

[0064]

[0065]

[0066]

[0067]

[0068]...

Embodiment 26～ Embodiment 36

[0074] In Examples 26 to 36, NCA is used as the positive electrode material of the lithium secondary battery, and the composition and content of additives in the electrolyte used (based on the total mass of the electrolyte) are added as shown in Table 3, and the battery evaluation cut-off voltage is 4.2V , The discharge lower limit voltage is 2.75V. The preparations of the rest of the negative electrode material, separator, and lithium secondary battery are the same as in Example 1.

[0075] Electrolyte additive composition and battery (NCA / silicon carbon) performance test result in each embodiment and comparative example of table 3

[0076]

[0077]

[0078]

[0079] The positive electrode material is NCA with silicon carbon negative electrode, and the embodiment 26 to embodiment 36 adopting the technical solution of the present invention also have good normal temperature cycle performance, high temperature storage performance and low temperature discharge performanc...

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Abstract

The invention discloses an electrolyte solution for a silicon based lithium secondary battery. The electrolyte solution comprises: a non-aqueous organic solvent, a lithium salt and an additive, wherein the additive comprises fluoroethylene carbonate, lithium difluoro(oxalato) borate and a compound with a structure shown as formula I in the specification, specifically in the formula I, X represents P=O group, P atom and B atom; A1, A2 and A3 are independently selected from one of alkyl, silicyl, and fluoroalkyl. At the same time, the invention also discloses a silicon based lithium secondary battery. The electrolyte solution can effectively improve the room temperature cycling performance, high temperature storage performance and low temperature discharge performance of the battery.

Description

technical field [0001] The invention relates to the field of electrolytic solutions, in particular to an electrolytic solution for a silicon-based lithium secondary battery and a silicon-based lithium secondary battery. Background technique [0002] Lithium secondary battery is the most competitive battery of the new generation, known as "green energy", and is the preferred technology to solve contemporary environmental pollution and energy problems. In recent years, lithium secondary batteries have achieved great success in the field of high-energy batteries, but consumers still expect batteries with higher comprehensive performance, which depends on the research and development of new electrode materials and electrolyte systems. At present, electronic digital products such as smart phones and tablet computers have higher and higher energy density requirements for batteries, making it difficult for commercial lithium secondary batteries to meet the requirements. There are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/052
CPCH01M10/052H01M10/0567H01M2300/0025Y02E60/10
Inventor 余乐占孝云黄东海周邵云周顺武张莉萍
Owner GUANGZHOU TINCI MATERIALS TECH
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