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Self Healing Liquid/Solid State Battery

A battery, liquid phase technology, applied in the field of high-capacity electrical energy storage, can solve problems such as increasing costs and limiting electrode utilization

Inactive Publication Date: 2016-06-08
MASSACHUSETTS INST OF TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the liquid phase region must often be confined to a small compositional area, which in turn limits the utilization of electrodes and increases the cost

Method used

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  • Self Healing Liquid/Solid State Battery
  • Self Healing Liquid/Solid State Battery
  • Self Healing Liquid/Solid State Battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Li-Bi cells were constructed and operated successfully to demonstrate the concept of a cathode operating in both liquid and solid phases. The amount of lithium used in these batteries was 71.4 mol%, which corresponds to Li 2.5 The final cathode combination of Bi, although the capacity of the battery can be extended to 75mol% lithium (Li 3 Bi). Assemble the battery to a fully charged state.

[0053] exist Figure 5A with 5B Express the charge and discharge voltage properties as a function of battery capacity in . exist Figure 5A In , the voltage curves from the 1st, 10th and 50th cycles are used to show the charge-discharge cycle. As shown, the curves nearly overlap, which indicates that the cycles remain consistent. The sloped regions that can be clearly observed at the beginning of the discharge cycle and at the end of the charge cycle constitute almost one third of the charge-discharge curve. The sloped area corresponds to the Figure 4 A single liquid phase...

Embodiment 2

[0058] Embodiments according to the present invention demonstrate large-scale batteries (eg, 182 cm 2 , 6 inches inside diameter). Using Li in a fully discharged state 70％ -Bi composition designed the battery. The electrolyte used is LiF 30％ -LiCl 70％ Eutectic composition (T m = 500°C). The operating temperature is 540°C. The battery was assembled and operated for more than 3000 hours. The battery system shows excellent performance, when at 50-500mA / cm 2 Its charge-discharge energy efficiency is in the range of 48-91.7% when cycled in the range of , see e.g. Figure 8 .

[0059] Figure 9A with 9B Performance criteria (eg, efficiency and discharge capacity, respectively) are shown as a function of cycle number for an exemplary Li-Bi battery system. A wide range of test parameters (for example, current, cut-off voltage, etc.), especially various current rates (50-500mA / cm 2 ).

[0060] Figure 10A with 10B Coulombic efficiency and energy efficiency and discharge...

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Abstract

A battery system that exchanges energy with an external device is provided. The battery system includes a positive electrode having a first metal or alloy, a negative electrode having a second metal or alloy, and an electrolyte including a salt of the second metal or alloy. The positive electrode, the negative electrode, and the electrolyte are in a liquid phase at an operating temperature during at least one portion of operation. The positive electrode is entirely in a liquid phase in one charged state and includes a solid phase in another charged state. The solid phase of the positive electrode includes a solid intermetallic formed by the first and the second metals or alloys. Methods of storing electrical energy from an external circuit using such a battery system are also provided.

Description

[0001] Cross References to Related Applications [0002] This patent application claims the benefit of US Provisional Patent Application No. 61 / 896,777, filed October 29, 2013, the disclosure of which is incorporated herein by reference in its entirety. [0003] Statement Regarding Federally Sponsored Research or Development [0004] This invention was made with Government support under Grant No. DE-AR0000047 awarded by the US Department of Energy. The Government has certain rights in this invention. technical field [0005] The present invention relates to high capacity electrical energy storage. In particular, new electrochemical energy storage devices and batteries operating in both liquid and solid phases are provided. Background technique [0006] Balancing the supply and demand of electrical energy across space and time is a long-standing problem in a wide range of applications from commercial producers to consumers. This supply-demand mismatch creates systemic pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/38H01M10/39H01M4/40H01M10/052
CPCH01M4/134H01M4/38H01M4/405H01M10/052H01M10/39Y02E60/10Y02P70/50H01M10/399H01M10/44H01M2004/021H02J7/00
Inventor 保罗·J·布尔克布赖斯·H·V·琼萨蒂亚吉特·R·帕德克宁晓辉唐纳德·R·萨多未
Owner MASSACHUSETTS INST OF TECH