吴宇平-锂离子电池安全问题解决的关键-聚合物电解质.pdf

文档介绍：锂离子电池安全问题解决的关键
-聚合物电解质
吴宇平
复旦大学化学系新能源与材料实验室
上海 200433
Tel/Fax: [phone]
Email: ******@fudan.
@ 锂离子电池新材料国际论坛
深圳,2010年7月29日
Outline
• Introduction
• GPEsbased on crosslinkedstructure
• Porous GPEsbased on P(AN-MMA)
• GPEsbased on P(VDF-HFP)
• Sandwiched GPEs
• Other GPEssuch as stick-like ones
• Summary
• Acknowledgement
NEML, FudanUni.
1. Introduction
Cathode: LiCoO
Anode: graphitic carbon 2
charge
Li+/e-
Li+ /e-
discharge
+ - Charge
Anode: 6 C + x Li + x e LixC6
Charge Discharge
Cathode: LiCoO Li CoO + x Li+ + x e-
2 Discharge 1-x 2
Charge
Total: 6 C + LiCoO2 DischargeLi1-xCoO2 + LixC6
. Wu et al., Lithium ion batteries: Practice & applications, Chemical Industry Press, 2004.
NEML, FudanUni.
Characteristics of lithium ion battery
• High output voltage (average ) and power
• High energy density (UR18650: >450 Wh/cm3, >150Wh/kg)
• Low self discharge (<10%/month)
• No memory effect
• Long cycle life (>1000 times)
• High rate capability (1C)
• High coulomb efficiency (near 100% except in the 1st cycle)
• Easy to measure the residual capacity
• Maintenance free
• No environmental pollution (green battery)
• Wide work temperature (-25 -+45oC, extended to –40 –
70oC)
Development of LIBs:
In the early of 1990s, lithium ion battery formally came into
birth, and it has been applied in a lot of fields.
NEML, FudanUni.
• Further applications of lithium ion batteries:
HEV, EV…
Rate capability, Price & Safety
. Wu et al., Lithium ion batteries: Practice & applications, Chemical Industry Press, 2004.
NEML, FudanUni.
ÖRate capability: anode and cathode


1C charge


Discharge
(a)1C rate
1
(b) 2C rate 2
3
10 8
12 5
13
V o l t a ge ( V) 15
16
18
20

0 100 200 300 400 500
Capacity (mAh)
1st cycle: 348 mAh/g 2C (348 mAh/g),
500th cycle: 301 mAh/g (357 mAh/g)
86% = %
SSG: Good