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A kind of composite titanate negative electrode material of lithium ion secondary battery and its synthesis method

A composite titanate and secondary battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of safety and long life hindering the wide application of lithium-ion batteries, rapid decay of battery cycle performance, and loss of reversible capacity , to achieve good processing performance, cheap raw materials, and good power performance

Active Publication Date: 2018-05-29
RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Safety and long life issues have hindered the widespread application of lithium-ion batteries in power electric vehicles and hybrid vehicles. Among many candidate materials that meet the requirements, the spinel-structured Li 4 Ti 5 o 12 It has excellent safety and long-life special properties. After it was proposed by K. Zaghib in 1996 that it can be used as the negative electrode of lithium-ion batteries, people are interested in Li 4 Ti 5 o 12 A lot of research has been carried out. Although the safety and service life meet the requirements, it cannot meet people's high power requirements for lithium-ion power batteries. The promotion of
[0004] Our laboratory has carried out a series of research work on this material (Journal of Power Sources245(2014)371~376), and found that the electronic conductivity of this material is higher than that of Li 4 Ti 5 o 12 , and the full battery shows excellent fast charge and discharge characteristics, but at the same time, the battery has problems such as rapid cycle performance decay and reversible capacity loss, and the cycle performance is inferior to that of Li 4 Ti 5 o 12

Method used

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  • A kind of composite titanate negative electrode material of lithium ion secondary battery and its synthesis method
  • A kind of composite titanate negative electrode material of lithium ion secondary battery and its synthesis method
  • A kind of composite titanate negative electrode material of lithium ion secondary battery and its synthesis method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Li 2 SrTi 5.98 al 0.02 o 13.99 Preparation of -0.2C

[0038] Lithium carbonate, anatase titanium dioxide, aluminum hydroxide, strontium carbonate and glucose are selected as raw materials, and the molar ratio of the synthesized product is Li:Sr:Ti:Al:C=2:1:5.98:0.02:0.2. In the atmosphere furnace, flush the furnace with nitrogen until the oxygen content in the furnace is less than 100ppm, adjust the gas flow to 1.5L / min, raise the temperature to 500°C at a rate of 5°C / min, keep it for 8 hours, cool naturally to room temperature, and grind After pulverization, the temperature was raised to 1100°C at 5°C / min for 24 hours, and then naturally cooled to room temperature to obtain a gray-black product.

Embodiment 2

[0040] Li 2.01 Sr 0.8 Ba 0.2 Ti 5.95 Zr 0.05 o 13.98 Preparation of -0.01TiN

[0041] Lithium carbonate, metatitanic acid, zirconium dioxide, strontium hydroxide, barium hydroxide and urea were selected as raw materials, and the ingredients were prepared according to the molecular formula of the above synthetic products. After mixing, they were placed in an atmosphere furnace and passed through N 2 Wash the furnace until the oxygen content in the furnace is less than 100ppm, then introduce reducing gas (N 2 with H 2 The mixture gas, volume ratio N 2 :H 2 =95:5), raised to 600°C at a heating rate of 5°C / min, kept for 4 hours, cooled naturally to room temperature, ground and pulverized, raised to 1000°C and kept for 24 hours, and naturally cooled to room temperature to obtain a light blue product.

Embodiment 3

[0043] Li 2.05 SrTi 5.9 Y 0.1 o 14 -0.03Al 2 o 3 preparation of

[0044] Lithium carbonate, anatase titanium dioxide, strontium carbonate and yttrium oxide are first selected as raw materials, and the ingredients are mixed according to the molar ratio Li:Sr:Ti:Y=2.05:1:5.9:0.1. After mixing, they are placed in a muffle furnace and blown into air. , first raise the temperature to 600°C at a rate of 5°C / min, keep it warm for 4 hours, and then cool it down to room temperature naturally, then raise the temperature to 1100°C and keep it for 12 hours, and then cool it down to room temperature naturally to get Li 2.05 SrTi 5.9 Y 0.1 o 14 matrix. Then according to the synthesis target product Li 2.05 SrTi 5.9 Y 0.1 o 14 :Al 2 o 3 (Molar ratio)=1:0.03, in Li 2.05 SrTi 5.9 Y 0.1 o 14 Aluminum hydroxide was added to the mixture, and after grinding and mixing, the powder was placed in an atmosphere furnace, and kept at 600°C for 8 hours in an air atmosphere, and natural...

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Abstract

The invention provides a titanate novel composite material as a negative electrode active substance for a lithium ion secondary battery and a preparation method thereof. The active substance is composed of the chemical composition represented by the general formula of Li[2+x]Sr[m]M[1-m]Ti[5+n]N[1-n]O[14-y]-cA[a]B[b], wherein M is a combination of one or more of Ba, Ca, Mg, K and Na, N is a combination of one or more of Al, Y, Zr and Nb, 0<=x<=0.5, 0<m<=1, 0<n<1, and 0<=y<=0.2; A is a combination of one or more of Li, Al, Ca, Mg, Ti, Zr and other elements; B is a combination of one or more of C, N and O elements; and 0<=a / b<=1, and 0<c<0.2. The Li<+> / Li working voltage of the composite material is 0.8-1.45 V, when Li<+> / Li is paired with lithium manganate or lithium cobaltate, the higher working voltage can be obtained compared with a battery with lithium titanate as a negative electrode, at the same time, the composite material has higher electronic conductivity than lithium titanate and excellent comprehensive battery high power performance, and the safety problem of battery short circuit caused due to precipitation of metallic lithium and formation of lithium dendrites also can be solved.

Description

technical field [0001] The invention relates to a novel composite titanate material which can be used as the negative electrode active material of a lithium ion secondary battery and a preparation method thereof. Background technique [0002] Safety and long life issues have hindered the widespread application of lithium-ion batteries in power electric vehicles and hybrid vehicles. Among many candidate materials that meet the requirements, the spinel-structured Li 4 Ti 5 o 12 It has excellent safety and long-life special properties. After it was proposed by K. Zaghib in 1996 that it can be used as the negative electrode of lithium-ion batteries, people are interested in Li 4 Ti 5 o 12 A lot of research has been carried out. Although the safety and service life meet the requirements, it cannot meet people's high power requirements for lithium-ion power batteries. promotion is of great significance. [0003] Li 2 SrTi 6 o 14 A series of synthetic studies were carried ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/62
CPCY02E60/10
Inventor 王兴勤高云刘建红吴宁宁
Owner RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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