Design and Preparation Method of Capacitive Lithium-Titanate Battery

doi:10.16183/j.cnki.jsjtu.2021.509

Abstract

Abstract:

In order to solve the problem of battery bulging and capacity fading, this paper proposes an innovative battery capacitor structure and the related preparation process. This method integrates the physical energy storage method of the capacitor and the chemical energy storage method of the energy storage battery. In the preparation process, a novel technology of columnar lithium-ion battery soaking is adopted, which improves the soaking efficiency and reduces the internal moisture of the battery. The related performance tests show that the capacity retention rate of the new lithium-titanate battery can reach 92.5% after 9 548 cycles, and the battery capacity can be maintained above 75% at a low temperature. The proposed method provides an effective means for improving the performance of the lithium-titanate battery.

Key words: lithium-titanate battery, capacitive battery structure, battery impregnation technology, double explosion-proof design

CLC Number:

TM911.3

WU Yuhang, LI Canbing, LI Xinxi, GU Huijun, GU Shanhua, ZHENG Xiaogeng. Design and Preparation Method of Capacitive Lithium-Titanate Battery[J]. Journal of Shanghai Jiao Tong University, 2023, 57(4): 473-481.

Figures/Tables 13

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负极种类	工作电位/V	循环寿命/次	倍率充放电/C	容量/ (mA·h·g^-1)	月自放电率/%
石墨	0.20	500~1000	1~10	365	≤2
钛酸锂	1.55	3000~7000	1~30	92	3~5

电池含浸方法	电芯吸收时间	电解液注入对象	杂质、水分	自动化程度
真空滴注式含浸技术	1~30 d	单颗电池	多	低
柱形锂离子电池含浸技术	1~80 h	一定数量的同规格电池	少	高

型号	标称电压/V	标称容量/ (mA·h)	质量/g	内阻/mΩ
HTC0416	2.4	5	0.34	200
HTC1020	2.4	100	3.00	120
HTC1330	2.4	240	8.60	35
HTC1450	2.4	500	16.60	35
HTC1850	2.4	900	29.70	20
HTC1865	2.4	1 300	38.50	40

循环次数	HTC1020					HTC1450
	1 C		10 C		1 C		10 C
	容量/(mA·h)	保持率/%	容量/(mA·h)	保持率/%	容量/(mA·h)	保持率/%	容量/(mA·h)	保持率/%
0	70.6	100.0	57.1	100	537.1	100.0	474.2	100.0
200	70.4	99.7	60.5	106	535.6	99.7	496.8	104.8
400	66.8	94.6	60.7	100	520.1	96.8	468.0	98.7
600	66.2	93.7	60.4	97	503.5	93.7	459.4	96.9
800	63.3	89.7	57.1	94	497.3	92.6	431.5	91.0
1 000	62.7	88.9	55.0	91	496.1	92.4	439.1	92.6