Secondary battery and electronic device

By adjusting the ratio of lithium salt additives and ethylene glycol bis(propionitrile) ether and the porosity of the separator, a suitable CEI membrane is formed, which solves the problem of numerous side reactions in lithium-ion batteries during cycling and improves low-temperature float charging performance, safety performance, and overcharge resistance under high temperature and high pressure.

WO2026149372A1PCT designated stage Publication Date: 2026-07-16NINGDE AMPEREX TECHNOLOGY LTD
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
NINGDE AMPEREX TECHNOLOGY LTD
Filing Date
2026-01-06
Publication Date
2026-07-16

AI Technical Summary

Technical Problem

Existing lithium-ion batteries exhibit numerous side reactions during cycling between the positive electrode and the electrolyte, and between the negative electrode and the electrolyte, which affect low-temperature float charging performance, safety performance, and overcharge resistance under high temperature and high pressure.

Method used

An electrolyte containing lithium salt additives and ethylene glycol bis(propionitrile) ether is used. The ratio of lithium salt additives to ethylene glycol bis(propionitrile) ether and the porosity of the separator are adjusted to form a CEI film at the interface between the positive electrode and the electrolyte. Combined with the appropriate porosity of the separator substrate layer, the mechanical strength and chemical stability of the CEI film are improved, and the ion permeability and electronic insulation are controlled.

Benefits of technology

It improves the low-temperature float charging performance, safety performance, and overcharge resistance under high temperature and high pressure of lithium-ion batteries, reduces the risk of interface gas generation and separator deformation, and improves the structural stability and safety of the battery.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure PCTCN2026070710-FTAPPB-I100001
    Figure PCTCN2026070710-FTAPPB-I100001
  • Figure PCTCN2026070710-FTAPPB-I100002
    Figure PCTCN2026070710-FTAPPB-I100002
  • Figure PCTCN2026070710-FTAPPB-I100003
    Figure PCTCN2026070710-FTAPPB-I100003
Patent Text Reader

Abstract

A secondary battery and an electronic device. The secondary battery comprises an electrolyte and a separator. The electrolyte comprises a lithium salt additive and ethylene glycol bis(propionitrile) ether. Based on the total mass of the electrolyte, the mass percentage content of the lithium salt additive is A%, and the mass percentage content of the ethylene glycol bis(propionitrile) ether is B%, wherein 0.035≤A / B≤20. The lithium salt additive satisfies at least one of the following features: a. the lithium salt additive comprises lithium bis(fluorosulfonyl)imide, wherein 0.1≤A≤ 2.5; and b. the lithium salt additive comprises lithium tetrafluoroborate, wherein 0.1≤A≤ 2.5. The separator comprises a substrate layer, and the porosity of the substrate layer is P%, wherein 15≤P≤35. The electrolyte and the separator are adopted, and the values of A / B, A, and P are controlled to be within the above ranges, such that the secondary battery can have better low-temperature float charging performance, safety performance, and resistance to overcharging under high-temperature and high-voltage conditions.
Need to check novelty before this filing date? Find Prior Art