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Electrolyte and preparation method, battery using electrolyte

An electrolyte and material technology, applied in the field of lithium-ion secondary batteries, can solve problems such as cycle deterioration

Inactive Publication Date: 2009-01-07
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide an electrolyte, a preparation method, and a battery using the electrolyte. The technical problem to be solved is to suppress the expansion of the lithium-ion battery at high temperature and normal temperature, reduce the irreversible capacity loss of the first charge and discharge of the lithium-ion battery and improve the cycle time. Efficiency, inhibit the high and low temperature performance of lithium-ion batteries caused by the addition of other additives, and the cycle becomes worse

Method used

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  • Electrolyte and preparation method, battery using electrolyte
  • Electrolyte and preparation method, battery using electrolyte
  • Electrolyte and preparation method, battery using electrolyte

Examples

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Effect test

preparation example Construction

[0085] The preparation method of the electrolytic solution of the present invention comprises the following steps: placing the organic solvent after mixing evenly, and containing succinic anhydride C 4 h 4 o 3 , propane sultone PS and vinyl sulfite ES mixed additives, shake well and leave for 0-24 hours, then add to the prepared organic solvent, seal and bake in vacuum at 20-90°C or directly for 1-24 hours After 24 hours, put it in the glove box and then add lithium salt, shake well and let it stand for more than 24 hours; or, after adding lithium salt in the organic solvent, first add succinic anhydride C 4 h 4 o 3 , seal and bake in a vacuum at 20-90°C or directly for 1-24 hours, then add propane sultone PS and vinyl sulfite ES in the glove box, shake well and leave for more than 24 hours; Add lithium salt to the solvent, place it for 1 to 24 hours, then add succinic anhydride C in any order 4 h 4 o 3 , propane sultone PS and vinyl sulfite ES, shake well and leave for...

Embodiment 1

[0094] Example 1 Electrolyte preparation: in the organic solvent of EC:EMC:DEC=1:1:1, add LiPF 6 Be prepared into a solution of 1.0mol / L, after standing for 1 hour, take the above-mentioned solution system as the main body to add its total amount of 0.3wt% solid powder succinic anhydride C 4 h 4 o 3 1. A total amount of 2wt% of propane sultone PS and a total amount of 2wt% of vinyl sulfite ES were shaken and placed for more than 24 hours. Preparation process of positive plate: 95wt% LiCoO 2 +3wt% PVDF+2wt% acetylene black, the three are mixed to form a paste, and then N-methylpyrrolidone is added to the mixture to make a paste and fully stirred to form a uniform slurry, which is coated on both sides of 18μm aluminum foil by a puller. The positive plate is obtained by vacuum heating and drying, and then cut into pieces to the required size. The preparation process of the negative electrode plate: 95wt% graphite + 2wt% dispersant + 3wt% binder, add an appropriate amount of w...

Embodiment 2

[0095] Embodiment 2 electrolyte preparation: in the organic solvent of EC:EMC:DEC=1:1:1, add LiPF 6 Be prepared into a solution of 1.0mol / L, after standing for 24 hours, take the above solution system as the main body, add its total amount of succinic anhydride C which is 1wt% therein 4 h 4 o 3 1. A total amount of 2wt% of propane sultone PS and a total amount of 2wt% of vinyl sulfite ES were shaken and placed for more than 24 hours. The ratio of positive and negative electrodes and the preparation and separator paper are the same as in Example 1.

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Abstract

A method for preparing electrolyte includes mixing composite additive uniformly and placing it there for 0-24 hours, adding prepared organic solvent, sealing prepared material and backing it for 1-24 hours then adding Li salt in.

Description

technical field [0001] The invention relates to an electrolyte solution for a lithium ion battery, a preparation method, and a lithium ion secondary battery containing the electrolyte solution. Background technique [0002] For non-aqueous electrolyte lithium-ion batteries, it is inevitable to react on the phase interface between the carbon negative electrode and the electrolyte during the first charging and discharging process of the battery, forming a passivation layer (SEI film) covering the surface of the carbon electrode. This passivation layer is an interfacial layer that has the characteristics of a solid electrolyte, but an electronic insulator of Li + good conductor of Li + Intercalation and extraction can be done freely through this passivation layer, while solvent molecules can be blocked out. The formation of SEI film has a crucial impact on the performance of electrode materials. On the one hand, the formation of the SEI film consumes part of the lithium ions...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/40H01M10/0525H01M10/0567H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 肖峰王明霞周贵树游华英
Owner BYD CO LTD
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