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Fully-sealed Li-ion storage battery based on ternary cathode material and preparation method of fully-sealed Li-ion storage battery

A technology of positive electrode materials and positive electrode active materials, which is applied in the field of lithium-ion batteries for space use and its preparation, can solve problems such as low power at work and poor safety performance of lithium-ion batteries, achieve stable cycle performance, improve rate discharge performance, and excellent The effect of safety performance

Inactive Publication Date: 2016-02-17
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The problem solved by the present invention is that the existing lithium-ion storage battery has poor safety performance and low power during operation; in order to solve the above-mentioned problem, the present invention provides a fully sealed lithium-ion storage battery based on a ternary positive electrode material and a preparation method thereof

Method used

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  • Fully-sealed Li-ion storage battery based on ternary cathode material and preparation method of fully-sealed Li-ion storage battery
  • Fully-sealed Li-ion storage battery based on ternary cathode material and preparation method of fully-sealed Li-ion storage battery
  • Fully-sealed Li-ion storage battery based on ternary cathode material and preparation method of fully-sealed Li-ion storage battery

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Embodiment 1

[0038] The manufacturing method of the fully sealed lithium-ion battery based on the ternary positive electrode material provided by the present invention is used to make the lithium-ion battery, wherein the active material in the positive electrode, nano-carbon fiber, super conductive carbon black and conductive graphite, the ratio of the binding agent is 88: 2:3:4:3, the ratio of the active material in the negative electrode, carbon nanofiber, super conductive carbon black, and binder is 90:2:4:4. figure 2 Shown is the rate discharge curve of the high specific power lithium-ion battery. Under the condition of 3C rate discharge, the capacity retention rate of the lithium-ion battery is 95.7% of the 0.2C capacity. The high specific power lithium ion storage battery provided by the invention has excellent rate discharge performance.

Embodiment 2

[0040]The manufacturing method of the fully sealed lithium-ion battery based on the ternary positive electrode material provided by the present invention is used to make the lithium-ion battery, wherein the active material in the positive electrode, nano-carbon fiber, super conductive carbon black and conductive graphite, the ratio of the binding agent is 92: 0.5:2.5:2.5:3, the ratio of active material in the negative electrode, carbon nanofiber, super conductive carbon black, and binder is 92:1.5:2.5:4. image 3 Shown is the cycle curve of the high specific power lithium-ion battery under 1C discharge conditions. The initial capacity of the lithium-ion battery is 33.78Ah, the capacity of the battery after 4000 cycles is 26.36Ah, and the capacity retention rate after 4000 cycles is 78.03% .

Embodiment 3

[0042] The manufacturing method of the fully sealed lithium-ion battery based on the ternary positive electrode material provided by the present invention is used to make the lithium-ion battery, wherein the active material in the positive electrode, nano-carbon fiber, super conductive carbon black and conductive graphite, the ratio of the binding agent is 91: 1:3:2:3, the ratio of active material in the negative electrode, carbon nanofiber, super conductive carbon black, and binder is 92:1:3:4. Figure 4 Shown is the high-power lithium-ion battery discharged at 3C, the final discharge voltage change curve at 20%DOD, after 7500 cycles, the final discharge voltage of the high-power lithium-ion battery changes smoothly, and the cycle performance of the lithium-ion battery is stable .

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Abstract

The invention discloses a fully-sealed Li-ion storage battery based on a ternary cathode material and a preparation method of the fully-sealed Li-ion storage battery. The fully-sealed Li-ion storage battery based on the ternary cathode material comprises a cathode, an anode, a diaphragm, an electrolyte solution and a case, wherein a cathode active material adopts LiNixCoyMn(1-x-y)O2 and an LiNixCoyMn(1-x-y)O2 modified material, and an anode active material adopts a mixture of mesocarbon microbeads with different particle sizes. With the adoption of the scheme, the safety performance and the discharge performance of the Li-ion storage battery can be improved.

Description

technical field [0001] The invention relates to a lithium-ion storage battery for space use and a preparation method thereof, in particular to a fully sealed lithium-ion storage battery based on a ternary positive electrode material and a preparation method thereof. Background technique [0002] Since its commercialization in 1991, lithium-ion batteries have attracted widespread attention due to their advantages such as high specific energy, high working voltage, low self-discharge efficiency and no memory effect. At present, lithium-ion batteries have been widely used in many fields such as transportation, communication, and energy. [0003] Traditional lithium-ion batteries use LiCoO 2 As the cathode active material, LiCoO 2 The cycle performance is good, but the safety performance is poor, and unsafe accidents such as fire and explosion are prone to occur in extreme cases such as overcharging and short circuit of the battery. This insecurity is particularly evident i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/583H01M4/62H01M4/131H01M4/133H01M4/1391H01M4/1393H01M10/0525H01M10/058
CPCH01M4/131H01M4/133H01M4/1391H01M4/1393H01M4/505H01M4/525H01M4/583H01M4/621H01M4/625H01M10/0525H01M10/058H01M2220/00Y02E60/10Y02P70/50
Inventor 郭向飞杨晨徐海洁潘延林杨丞钱斌
Owner SHANGHAI INST OF SPACE POWER SOURCES
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