High energy density lithium-ion batteries

doi:10.19799/j.cnki.2095-4239.2022.0125

Abstract

Abstract:

Silicon is an important material in the development of high specific energy lithium-ion batteries due to its high theoretical capacity. However, during the cycle process, silicon has huge volume changes. This causes the negative material to be pulverized and fall off, which affects the battery's electrochemical performance. As an important part of the electrode, the binder can stabilize the anode structure and improve battery performance. Thus, this review summarizes research related to silicon-based anode binders, e.g., synthetic polymer and biopolymer binder. Synthetic polymer binders primarily include polyacrylic acid, polyvinylidene fluoride, and conductive binders, and biopolymer binders primarily include carboxymethyl cellulose, sodium alginate, and other biological binders. The selection conditions of a silicon-based anode binder are analyzed in this paper. The silicon-based anode binder should have polar functional groups, certain elasticity and mechanical strength, high chemical stability, and preferably certain conductivity. Polar groups can form hydrogen bonds with hydroxyl groups on the surface of silicon to enhance the bonding properties between materials. To better restrict the volume expansion of silicon, it can be modified to possess elastic properties and self-healing ability. Some conductive materials can also be selected to make the binder have conductive properties. This can improve the stability of the conductive network inside the electrode and increase the content of active substances. In addition, concepts related to the selection and development of a binder are discussed.

Key words: lithium-ion batteries, silicon-based anode, binder, polymers

CLC Number:

TQ 152

Jianxiang DENG, Jinliang ZHAO, Chengde HUANG. High energy density lithium-ion batteries[J]. Energy Storage Science and Technology, 2022, 11(7): 2092-2102.

Figures/Tables 6

Table 1

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黏结剂	合成方式	负极材料	首次库仑效率/首次容量	循环性能	参考文献
CA-PAA	原位交联	SiNPs	89.5%	78%/50th，0.1 C	[20]
4A-PAA	自由基聚合	SiO _x /C	—	89.1%/200th，0.16 A/g	[21]
PDA-PAA	接枝	SiNPs	3192 mAh/g	77.7%/100th，2 C	[22]
PAA-VTEO	水溶液共聚	Si/C	89.4%	99.17%/100th，0.1 C	[23]
PVDF-g-PtBA	自由基聚合	SiNPs	78%	84%/50th，0.05 C	[24]
碳化PVDF	固态反应	Si/Cu/Cu₃Si/C	82%	1773 mAh/g/300th，2 A/g	[25]
Sn⁴⁺-PEDOT:PSS	离子交联	SiNPs	3400 mAh/g	1876.4 mAh/g/100th，8 A/g	[26]
甘油-PEDOT:PSS	交联	SiNPs	85.6%	1951.5 mAh/g/200th，0.5 A/g	[27]
PANI-PAA	聚合	SiNPs	—	83%/100th，840 mA/g	[28]
PNaM	乳液聚合	Si/C	88%	75%/200th，C/3	[29]
PPy-b-PB	缩合	SiNPs	77.9%	87.1%/200th，0.84 A/g	[30]
CMC-PDA	聚合	SiNPs	87%	80%/150th，0.2 C	[31]
CMC-PEG	原位交联	SiNPs	81%	78%/350th，0.5 C	[32]
Ni²⁺-Alg	离子交联	SiNPs	81.8%	83.1%/500th，0.2 C	[33]
c-Alg-g-PAAm	双交联	Si/C	72.8%	71.6%/100th，0.1 C	[34]
TA		SiNPs	86%	850/650th，0.5 C	[35]
OG		SiNPs	2067 mAh/g	99%/50th，0.1 C	[36]
PG-c-ECH	化学交联	SiNPs	60 mAh/cm²	92.8%/300th，4 A/g	[37]
PAL-NaPAA	自由基聚合	硅微粒		1914 mAh/g/100th	[38]

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