当前位置:首页>复习资料>【2026版化学高考步步高大二轮专题复习讲义广东专用版专题四微点突破2二次电池及特殊电池

【2026版化学高考步步高大二轮专题复习讲义广东专用版专题四微点突破2二次电池及特殊电池

  • 2026-03-17 14:45:39
【2026版化学高考步步高大二轮专题复习讲义广东专用版专题四微点突破2二次电池及特殊电池

1.可充电电池(二次电池)

(1)工作原理

因此,充电时电极的连接可简记为负接负后作阴极,正接正后作阳极

(2)分析流程

a.首先应分清电池是放电还是充电。

b.再判断出正、负极或阴、阳极。

放电

阳离子正极,阴离子负极

充电

阳离子阴极,阴离子阳极

即:阳离子发生还原反应的电极

阴离子发生氧化反应的电极

c.将负(正)极反应式变换方向并将电子移项即可得出阴(阳)极反应式。

d.分析电池工作过程中电解质溶液的变化时,要结合电池总反应进行分析。

(3)常见的锂离子二次电池

正极材料:LiMO2(M:Co、Ni、Mn等)、LiM2O4(M:Co、Ni、Mn等)、LiMPO4(M:Fe等)

负极材料:石墨(能吸附锂原子)

负极反应:LixCn-xe-===xLi++nC

正极反应:Li1-xMO2+xLi++xe-===LiMO2

总反应:Li1-xMO2+LixCnnC+LiMO2

2.几种特殊的原电池

一般情况下,能自发进行的氧化还原反应可设计成原电池,但也存在一些特殊情况。

(1)沉淀反应、中和反应等非氧化还原反应也可以设计为原电池。如:

类型

原理图及信息

反应式

利用沉淀反应设计的原电池

负极:Ag-e-+Cl-===AgCl;

正极:Ag++e-===Ag;

总反应:Ag++Cl-===AgCl

利用中和反应设计的原电池

负极:H2-2e-+2OH-===2H2O;

正极:2H++2e-===H2

总反应:H++OH-===H2O

(2)利用离子浓度差也可以设计成原电池,即浓差电池,其总反应是一个体系的物理状态的变化。如:

类型

原理图及信息

电极反应式

浓差电池

闭合开关K后,电子由溶液浓度小的一极流出

负极:Ag-e-===Ag+

正极:Ag++e-===Ag

(3)可逆的氧化还原反应也可设计成原电池,改变物质的浓度,电极反应式会发生变化。如:

类型

原理图及信息

电极反应式

利用可逆氧化还原反应设计的原电池

总反应:2Fe3++2I-2++I2

反应开始时,负极为乙中的石墨,电极反应式为2I--2e-===I2

当达到化学平衡状态时,向甲中加入FeCl2固体,此时负极为甲中的石墨,电极反应式为Fe2+-e-===Fe3+

1.(2025·广东,14)一种高容量水系电池示意图如图。已知:放电时,电极上MnO2减少;电极材料每转移1 mol电子,对应的理论容量为26.8 A·h。下列说法错误的是(  )

A.充电时为阳极

B.放电时极室中溶液的pH降低

C.放电时负极反应为MnS-2e-===S+Mn2+

D.充电时16 g S能提供的理论容量为26.8 A·h

答案 B

解析根据题给已知信息可知,放电时,电极MnO2减少,说明电极MnO2得电子发生还原反应转化为Mn2+进入溶液中,故电极作正极,电极反应式为MnO2+2e-+4H+===Mn2++2H2O,放电时电极为负极,电极反应式为MnS-2e-===S+Mn2+。结合上述分析可知,充电时电极为阳极,A正确;结合放电时电极上的反应可知,极室溶液中反应消耗H+,溶液pH升高,B错误;充电时,电极上发生的电极反应式为S+Mn2++2e-===MnS,16gS的物质的量为0.5mol,完全反应可转移1mol 电子,结合题干信息可知,16gS能提供的理论容量为26.8A·h,D正确。

2.(2022·广东,16)科学家基于Cl2易溶于CCl4的性质,发展了一种无需离子交换膜的新型氯流电池,可作储能设备(如图)。充电时电极a的反应为NaTi2(PO4)3+2Na++2e-===Na3Ti2(PO4)3。下列说法正确的是(  )

A.充电时电极b是阴极

B.放电时NaCl溶液的pH减小

C.放电时NaCl溶液的浓度增大

D.每生成1 mol Cl2,电极a质量理论上增加23 g

答案 C

解析由充电时电极a的反应可知,充电时电极a发生还原反应,所以电极a是阴极,则电极b是阳极,故A错误;放电时负极反应为Na3Ti2-2e-===NaTi2+2Na+,正极反应为Cl2+2e-===2Cl-,反应后Na+Cl-浓度都增大,则放电时NaCl溶液的浓度增大,pH不变,故B错误,C正确;充电时阳极反应为2Cl--2e-===Cl2,阴极反应为NaTi2+2Na++2e-===Na3Ti2(PO4)3,由得失电子守恒可知,每生成1molCl2,电极a质量理论上增加23g·mol-1×2mol=46g,故D错误。

通过网盘分享的文件:word讲义【更新联系:lymsummers】等2个文件

链接: https://pan.baidu.com/s/1VcNxeHXgbJfoVMtA3SnQAg?pwd=4321 提取码: 4321 

--来自百度网盘超级会员v8的分享

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  1. CONNECT:[ UseTime:0.000400s ] mysql:host=127.0.0.1;port=3306;dbname=i_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000852s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000289s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000298s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000450s ]
  6. SELECT * FROM `set` [ RunTime:0.000203s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000566s ]
  8. SELECT * FROM `article` WHERE `id` = 462559 LIMIT 1 [ RunTime:0.000391s ]
  9. UPDATE `article` SET `lasttime` = 1774759038 WHERE `id` = 462559 [ RunTime:0.000619s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000214s ]
  11. SELECT * FROM `article` WHERE `id` < 462559 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000386s ]
  12. SELECT * FROM `article` WHERE `id` > 462559 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000430s ]
  13. SELECT * FROM `article` WHERE `id` < 462559 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001792s ]
  14. SELECT * FROM `article` WHERE `id` < 462559 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005610s ]
  15. SELECT * FROM `article` WHERE `id` < 462559 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002660s ]
0.082571s