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Non-aqueous electrolyte lithium secondary battery

A lithium secondary battery and non-aqueous electrolyte technology, which is applied in the direction of non-aqueous electrolyte batteries, non-aqueous electrolytes, secondary batteries, etc., and can solve the problems of shortened battery life

Active Publication Date: 2010-08-11
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if γ-butyrolactone is added in this way, although the high-rate discharge characteristics at low temperature are improved, the life of the battery is shortened

Method used

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  • Non-aqueous electrolyte lithium secondary battery
  • Non-aqueous electrolyte lithium secondary battery
  • Non-aqueous electrolyte lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0052] LiPF was added to a mixed organic solvent in which ethylene carbonate (EC) and ethyl propionate (EP) were mixed at a volume ratio of 3:7 6 , to prepare 1M LiPF 6 solution, to which was then added 0.1% by weight of LiBF based on the total weight of the nonaqueous electrolyte 4 , so as to prepare non-aqueous electrolyte.

[0053] Then, the pouch lithium secondary battery is prepared by a common way, that is, the non-aqueous electrolyte of the lithium secondary battery prepared above is injected into the pouch battery, which uses LiCoO 2 As a cathode active material, and artificial graphite is used as an anode active material.

Embodiment approach 2

[0055] A pouch-shaped lithium secondary battery was prepared in the same manner as in Embodiment 1, except that 0.2% by weight of LiBF was used 4 .

Embodiment approach 3

[0057] A pouch-shaped lithium secondary battery was prepared in the same manner as in Embodiment 1, except that 0.5% by weight of LiBF was used 4 .

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Abstract

A lithium secondary battery has a cathode made of carbon material capable of occluding or emitting a lithium ion, a cathode made of lithium-contained oxide, and a non-aqueous electrolyte. The non-aqueous electrolyte includes a lithium salt containing LiPF6 and LiBF4; and a non-linear carbonate-based mixed organic solvent in which (a) a cyclic carbonate having ethylene carbonate or a mixture of ethylene carbonate and propylene carbonate and (b) a propionate-based ester such as ethyl propionate are mixed at a volume ratio (a:b) in the range from about 10:90 to about 70:30. This lithium secondary battery ensures excellent high-rate charging / discharging characteristics and improved life cycle and low-temperature discharging characteristics since it includes a predetermined mixed organic solvent not including a linear carbonate. Also, since gas generation is restrained at a high temperature, a battery set may be mounted in a more improved way.

Description

technical field [0001] The present invention relates to a non-aqueous electrolyte lithium secondary battery, and more particularly to a lithium secondary battery with improved high-temperature discharge characteristics. Background technique [0002] Recently, there has been increasing interest in energy storage technologies. As energy storage technology spreads to devices such as mobile phones, video cameras, and notebook PCs, as well as electric vehicles, the demand for high-energy-density batteries used as energy sources for such electronic devices has increased. Lithium-ion secondary batteries are one of the most satisfactory batteries, and a great deal of improvement research is actively underway. [0003] Among the currently used secondary batteries, the lithium secondary battery developed in the early 1990s includes an anode made of a carbon material capable of storing and releasing lithium ions, a cathode made of a lithium-containing oxide, and an appropriate amount ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M10/0567H01M10/0569
CPCH01M10/0567H01M10/4235H01M2300/0091H01M10/0569H01M2300/0082Y02E60/10H01M10/05H01M4/02
Inventor 全钟昊曹正柱李镐春
Owner LG ENERGY SOLUTION LTD
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